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- - By rocket (****) Date 2020-03-18 18:45
I wanted to get an insight into how these old engines played so I had it self play a couple of different openings. How come this original Fritz (knightstalker) played so timid? No pawnstorms, ultra ultra solid. Why were pawn pushes rejected? Was it due to king safety parameters?

The game below is still a masterpiece, but notice how it's primarily piece play

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7 6.d4 Nge7 7.Bb3 h6 8.Nbd2 Ng6 9.Nc4 Be7 10.O-O O-O 11.Be3 Bf6 12.h3 Nce7 13.dxe5 Nxe5 14.Nfxe5 dxe5 15.Qh5 Nc6 16.Bc5 Be7 17.Nxe5 Bxc5 18.Nxf7 Rxf7 19.Bxf7+ Kf8 20.Qxc5+ Kxf7 21.Rad1 Qe8 22.f4 Rd8 23.Rfe1 Kg8 24.Qc4+ Qe6 25.Qxe6+ Bxe6 26.Rxd8+ Nxd8 27.b3 Kf7 28.g4 g6 29.f5 Bc8 30.Kf2 Nc6 31.Ke3 Ne5 32.Rd1 Bd7 33.Rd5 Kf6 34.a3 Bc6 35.Rd8 Nd7 36.Kd4 h5 37.Rc8 hxg4 38.hxg4 gxf5 39.gxf5 Ne5 40.Rg8 Bd7 41.Ke3 c5 42.Rd8 Ke7 43.Rh8 c4 44.Kd4 Nf7 45.Rb8 Bc6 46.bxc4 Nd6 47.Rh8 Nxe4 48.Ke5 Kf7 49.Rh7+ Kg8 50.Re7 Nxc3 51.f6 Ne4 52.Ke6 Nd2 53.f7+ Kg7 54.Re8
Parent - - By MrKris (***) Date 2020-03-19 02:29 Edited 2020-03-19 03:12
I am sure it is very interesting, thanks.

I am wondering though: why don't you use the pgn function where you made the post?

Why try to make every reader cut and paste (or whatever) when you can do that for us once?

Did you notice every other poster on this forum uses the pgn function when posting?
- Besides so much easier if a reader likes the game they can click the c8 square for a pgn copy for themselves.

Do you really think it is worth readers' time to edit into software or to get out their set and board and play through manually?
Parent - By MarshallArts (***) Date 2020-03-19 05:19
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7 6.d4 Nge7 7.Bb3 h6 8.Nbd2 Ng6 9.Nc4 Be7 10.O-O O-O 11.Be3 Bf6 12.h3 Nce7 13.dxe5 Nxe5 14.Nfxe5 dxe5 15.Qh5 Nc6 16.Bc5 Be7 17.Nxe5 Bxc5 18.Nxf7 Rxf7 19.Bxf7+ Kf8 20.Qxc5+ Kxf7 21.Rad1 Qe8 22.f4 Rd8 23.Rfe1 Kg8 24.Qc4+ Qe6 25.Qxe6+ Bxe6 26.Rxd8+ Nxd8 27.b3 Kf7 28.g4 g6 29.f5 Bc8 30.Kf2 Nc6 31.Ke3 Ne5 32.Rd1 Bd7 33.Rd5 Kf6 34.a3 Bc6 35.Rd8 Nd7 36.Kd4 h5 37.Rc8 hxg4 38.hxg4 gxf5 39.gxf5 Ne5 40.Rg8 Bd7 41.Ke3 c5 42.Rd8 Ke7 43.Rh8 c4 44.Kd4 Nf7 45.Rb8 Bc6 46.bxc4 Nd6 47.Rh8 Nxe4 48.Ke5 Kf7 49.Rh7+ Kg8 50.Re7 Nxc3 51.f6 Ne4 52.Ke6 Nd2 53.f7+ Kg7 54.Re8
Parent - By rocket (****) Date 2020-03-19 14:33
Ok, I will henceforth. I didn't look for it.
Parent - - By Carl Bicknell (*****) Date 2020-03-28 22:45

> No pawnstorms, ultra ultra solid. Why were pawn pushes rejected? Was it due to king safety parameters?


this was typical of early Fritz's. They weren't passive, far from it, but they didn't understand pawns. It had one of the best searches around though
Parent - By rocket (****) Date 2020-03-30 04:35
Fritz 2 is pretty passive.... I like it's quiet positional style but it's certainly not offensive.

This is how it plays against the Caro-kann against me, without opening book. Slow chess

A3, b3, Ra2, Re2..:wink:

White: Fritz 2.51
Black: me

Time control 120/40/20/60

Opening book off
1.e4 c6 2.Nf3 d5 3.exd5 cxd5 4.d4 Nf6 5.Bd3 e6 6.O-O Be7 7.c3 Nc6 8.Re1 O-O 9.b3 b6 10.a3 Bb7 11.Ra2 Na5 12.Rae2 Rc8 13.h3 Qc7 14.Ne5 Nd7 15.Bf4 Bd6 16.Nxd7 Qxd7 17.Bxd6 Qxd6 18.Re3 g6 19.Be2 a6 20.Bd3 Rfe8 21.a4 Re7 22.Bc2 Rce8 23.Nd2 e5 24.dxe5 Rxe5 25.Rxe5 Rxe5 26.Rxe5 Qxe5 27.c4 Qd4 28.cxd5 Bxd5 29.Kf1 Kf8 30.g3 Nc6 31.Nf3 Qxd1+ 32.Bxd1 Ke7 33.Ke2 Bxf3+ 34.Kxf3 Kd6 35.Ke3 Kc5 36.Be2 b5 37.f4 Kb4 38.Bf3 bxa4 39.bxa4 Ne7 40.Be2 a5 41.Bb5 Nf5+ 42.Kf2 Nd6 43.Bc6 f6 44.Ke2 Nf5 45.Kf2 Ne7 46.Bd7 Nd5 47.Be6 Nc3 48.Bg8 h6 49.Kf3 Kxa4 50.Kg4 Ne2 51.Bf7 g5 52.fxg5 fxg5 53.Kh5 Nxg3+ 54.Kxh6 Ne4 55.Bd5 Nf2 56.Be6 Nxh3 57.Bxh3 Kb4 58.Kxg5 a4 59.Be6 a3 60.Ba2 Kc3 61.Kf6 Kb2 62.Bd5 a2 63.Bxa2 Kxa2
Parent - By rocket (****) Date 2020-03-30 04:45
<It had one of the best searches around though>

Yes search is excellent but why does it have this blind spot (25 Re5+??)? Is it due to pruning? I saw the trap instantly...

It doesn't matter if you give it several minutes, it still goes for Re5. I don't know when it realizes it.

It usually doesn't error like this

White Fritz 2.51
Black me:

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 Nf6 6. e3 c6 7. Bd3 O-O 8. Nge2 h6 9. O-O Re8 10. Rc1 Bd6 11. Re1 Ne4 12. Nxe4 dxe4 13. Bc2 Bf5 14. Bxd6 Qxd6 15. Nf4 Nd7 16. Qh5 Bh7 17. Bb3 Re7 18. Red1 Nf6 19. Qc5 Rd7 20. a3 Qxc5 21. Rxc5 Rad8 22. h3 Kf8 23. Kf1 Ke7 24. g3 g5 25. Re5 Kf8 26. Ne2 Nd5 27. Bxd5 cxd5 28. g4 f6 29. Rf5 Bxf5 30. gxf5 Rc7 31. Nc3 Rc4 32. Kg2 a6 33. f3 exf3 34. Kxf3 b5 35. Rc1 Rdc8 36. Ra1 Rd8 37. Rc1 h5 38. b3 Rc6 39. Na2 Rxc1 40. Nxc1 Rc8 41. Nd3 Rc3 42. Nc5 a5 43. Ke2 Rc1 44. e4 dxe4 45. Nxe4 Ke7 46. d5 Rh1 47. d6 Kd7 48. a4 b4 49. Nf2 Rh2 50. Kf1 Rxf2 51. Kxf2 Kxd6 52. Ke3 Kd5 53. Kd3 g4 54. hxg4 hxg4 55. Ke3 Ke5 56. Kf2 Kxf5 57. Ke3 Kg5 58. Kf2 Kf4 59. Kf1 Kf3 60. Ke1 Ke3 61. Kf1 f5 62. Kg2 f4 63. Kf1 f3 64. Ke1 g3 65. Kf1 f2 66. Kg2 Ke2 67. Kxg3 f1=Q 68. Kh2 Qf4 69. Kh3 Qg5 70. Kh2 Kf2 71. Kh1 Qg2#
- - By rocket (****) Date 2020-03-19 14:31 Edited 2020-03-19 14:34 Upvotes 1
Here's a game I played against it: Surprisingly strong initial moves out of book (move 4)... The position is perfectly balanced out of the opening.

White: Rocket
Black: Fritz 2.51
Time control: 10 minutes

1.d4 d5 2.Nf3 e6 3.Bg5 Be7 4.Bxe7 Nxe7 5.e3 Nd7 6.Bd3 c5 7.c3 c4 8.Bc2 Qb6 9.Qc1 O-O 10.Nbd2 Qc6 11.O-O a6 12.Re1 b5 13.e4 Bb7 14.e5 Rfc8 15.Nh4 Rab8 16.f4 a5 17.g4 a4 18.a3 h6 19.Nf1 Ra8 20.Ng3 Rab8 21.Rf1 Rc7 22.Kg2 Rcc8 23.Qd2 Rc7 24.Nf3 Nb6 25.h4 Rcc8 26.Rh1 Rc7 27.Qf2 Rcc8 28.Nh5 Nd7 29.Rhg1 Nf8 30.Kh2 Ra8 31.f5 Nd7 32.f6 gxf6 33.Nxf6+ Nxf6 34.exf6 Qc7+ 35.Kh1 Ng6 36.Bxg6 fxg6 37.Ne5 g5 38.f7+ Kg7 39.Rg2 Rh8 40.Rf1 Qd8 41.h5 Rf8 42.Rg3 Qe7 43.Rf3 Qd6 44.Rf6 Qe7 45.Qc2 Qxf6 46.Rxf6 Kxf6 47.Qg6+ Ke7 48.Qxh6 Kd6 49.Qxg5 Ba6 50.Qg7 b4 51.cxb4 c3 52.bxc3 Be2 53.h6 Rac8 54.h7 Bxg4 55.Ng6 Rfd8 56.h8=Q Rxh8+ 57.Nxh8 Bf3+ 58.Kh2 Be4 59.f8=Q+ Rxf8 60.Qxf8+ Kd7 61.Qf7+ Kd6 62.Ng6 Bxg6 63.Qxg6 Ke7 64.Qg7+ Kd8 65.Qb7 Ke8 66.Kg3 Kd8 67.Kf4 Ke8 68.Ke5 Kf8 69.Kf6 Ke8 70.Qe7#
Parent - - By rocket (****) Date 2020-03-19 14:50
On the old SSDF list

Fritz 2 486/33 MHz  elo 2032

You guys can download it for free and see if the elo estimate is correct.

I bet we have a lot of 2000 elo guys in here
Parent - By Vegan (****) Date 2020-11-05 04:01
I am slightly better than 2000 elo, given I beat Crafty easily......
- - By rocket (****) Date 2020-03-19 20:17 Edited 2020-03-19 20:47 Upvotes 1
Game 2

White: Fritz 2
Black Rocket (me)

TC 10 minutes +3

1.Nf3 Nf6 2.c4 g6 3.d4 Bg7 4.Nc3 O-O 5.e4 d6 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3 a5 11.b3 f5 12.Bb2 Nc5 13.Nd3 b6 14.Nxc5 bxc5 15.Qd3 f4 16.Rfd1 g5 17.Bf1 h5 18.Rab1 g4 19.Be2 Ng6 20.a3 Qh4 21.Nb5 g3 22.h3 Bxh3 23.Kf1 Bxg2+ 24.Ke1 Qd8 25.Rd2 h4 26.Bf1 Bxf1 27.Qxf1 Qd7 28.Qd3 h3 29.Nc3 h2 30.Qf1 Kf7 31.Qh1 Qh3 32.Kd1 Nh4 33.Kc1 g2 34.Rxg2 Nxg2 35.Kd2 Qxf3 36.Ra1 Bf6 37.Nd1 Rh8 38.Nc3 Qe3+ 39.Kc2 f3 40.Rd1 Qf2+ 41.Kb1 Ne3 42.Rc1 Rag8 43.Ba1 Rg1 44.Bb2 Rxh1 45.Rxh1 Qg1+ 46.Rxg1 hxg1=Q+ 47.Ka2 f2 48.Ne2 Qd1 49.Ng3 f1=Q 50.Nxf1 Nxf1 51.a4 Nd2 52.Bc1 Qxb3+ 53.Ka1 Qb1#

Game 3
White: Rocket (me)
Black: Fritz 2

TC 10+3
1.e4 c5 2.Nc3 Nc6 3.Nf3 g6 4.g3 Bg7 5.Bg2 d6 6.O-O Nf6 7.d3 O-O 8.Nd2 Nd4 9.h3 Bd7 10.f4 Bc6 11.Ne2 Nxe2+ 12.Qxe2 b6 13.c3 a6 14.g4 Re8 15.Bf3 Qc7 16.Kh1 Rec8 17.Rg1 e5 18.f5 d5 19.g5 dxe4 20.dxe4 Nd7 21.f6 Bh8 22.Bg4 Rd8 23.h4 Bb5 24.c4 Bc6 25.Rg2 Bb7 26.Nb1 h5 27.Bf3 Rac8 28.Nc3 Qd6 29.Be3 Qe6 30.Nd5 Rb8 31.Rf1 a5 32.Kh2 Ba6 33.Bxh5 Bb7 34.Bg4 Qd6 35.h5 gxh5 36.Bxh5 Kf8 37.Bg4 Rbc8 38.Rg3 Bxd5 39.cxd5 Ra8 40.Bxd7 Rxd7 41.Rh3 Bg7 42.Qh5 Bxf6 43.gxf6 Qxf6 44.Rxf6 a4 45.Rhf3 Ke8 46.Qh8+ Ke7 47.Qg7 Kd8 48.Qf8+ Kc7 49.Qxa8 Rd6 50.Rxf7+ Rd7 51.Qa7+ Kc8 52.Qxd7+ Kb8 53.Rf8#
Parent - - By Uly (Gold) Date 2020-03-19 22:31
Well done. The last engine I could beat was Rebel Decade at 6Ply (and on a Friday!) no idea how it compares to Fritz 2.
Parent - By rocket (****) Date 2020-03-20 00:04
This time Fritz held a draw

White Fritz 2
Black:Rocket (Me)

1.Nf3 Nf6 2.d4 d6 3.c4 e6 4.Bg5 Be7 5.Nc3 b6 6.e3 Bb7 7.Bd3 Nbd7 8.O-O O-O 9.Rc1 e5 10.Bf5 exd4 11.exd4 g6 12.Bc2 Re8 13.Re1 Kg7 14.a3 Nh5 15.Rxe7 Rxe7 16.Bxe7 Qxe7 17.b3 a6 18.d5 Re8 19.Qd2 Qf6 20.Rd1 Qf4 21.Ne2 Qxd2 22.Rxd2 Nhf6 23.h3 Ne4 24.Bxe4 Rxe4 25.Nc3 Re8 26.Kh2 Ne5 27.Nd4 Nd7 28.Kg3 Nc5 29.b4 Ne4+ 30.Nxe4 Rxe4 31.Kf3 Re7 32.Kf4 Kf6 33.Re2 Re5 34.Rd2 Re7 35.Re2 Re5 36.Rd2 Re7 37.Re2 Re5
Parent - By rocket (****) Date 2020-03-20 19:41
Rebel Decade Pentium 90 MHz                         2175

SSDF rating list
- By rocket (****) Date 2020-03-20 14:54
Fritz blunders an exchange with 25.. Re5+?? and the rest is pure technique

White: Fritz 2
Black: Me

10+5 permanent brain on

1.d4 d5 2.c4 e6 3.Nc3 Be7 4.cxd5 exd5 5.Bf4 Nf6 6.e3 c6 7.Bd3 O-O 8.Nge2 h6 9.O-O Re8 10.Rc1 Bd6 11.Re1 Ne4 12.Nxe4 dxe4 13.Bc2 Bf5 14.Bxd6 Qxd6 15.Nf4 Nd7 16.Qh5 Bh7 17.Bb3 Re7 18.Red1 Nf6 19.Qc5 Rd7 20.a3 Qxc5 21.Rxc5 Rad8 22.h3 Kf8 23.Kf1 Ke7 24.g3 g5 25.Re5+ Kf8 26.Ne2 Nd5 27.Bxd5 cxd5 28.g4 f6 29.Rf5 Bxf5 30.gxf5 Rc7 31.Nc3 Rc4 32.Kg2 a6 33.f3 exf3+ 34.Kxf3 b5 35.Rc1 Rdc8 36.Ra1 Rd8 37.Rc1 h5 38.b3 Rc6 39.Na2 Rxc1 40.Nxc1 Rc8 41.Nd3 Rc3 42.Nc5 a5 43.Ke2 Rc1 44.e4 dxe4 45.Nxe4 Ke7 46.d5 Rh1 47.d6+ Kd7 48.a4 b4 49.Nf2 Rh2 50.Kf1 Rxf2+ 51.Kxf2 Kxd6 52.Ke3 Kd5 53.Kd3 g4 54.hxg4 hxg4 55.Ke3 Ke5 56.Kf2 Kxf5 57.Ke3 Kg5 58.Kf2 Kf4 59.Kf1 Kf3 60.Ke1 Ke3 61.Kf1 f5 62.Kg2 f4 63.Kf1 f3 64.Ke1 g3 65.Kf1 f2 66.Kg2 Ke2 67.Kxg3 f1=Q 68.Kh2 Qf4+ 69.Kh3 Qg5 70.Kh2 Kf2 71.Kh1 Qg2#
- By rocket (****) Date 2020-03-21 02:04
White: Fritz 2
Black me
Result: draw

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3 Bc5 6.Nc3 b5 7.Bb3 d6 8.Bg5 h6 9.Bxf6 Qxf6 10.Nd5 Qd8 11.c3 O-O 12.O-O Bb7 13.d4 Ba7 14.Re1 Re8 15.a3 Na5 16.Ba2 c5 17.b4 Nc6 18.dxc5 dxc5 19.Qe2 c4 20.Rad1 Qc8 21.Kh1 Ne7 22.Rd2 Ng6 23.Red1 Qc6 24.h3 Re6 25.Bb1 Rae8 26.Ba2 Nf4 27.Qf1 Ng6 28.Qe2 Nf4 29.Qf1 Ng6 30.Qe2 Nf4

- By rocket (****) Date 2020-03-21 14:45
Here's a nice endgame convertion for y'all.

White: Fritz 2
Black: Me

1.d4 Nf6 2.Nf3 e6 3.c4 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 d6 8.b3 Ne4 9.Nxe4 Bxe4 10.Bb2 Nd7 11.a3 c5 12.dxc5 bxc5 13.Re1 Rb8 14.Rc1 Qc7 15.Bc3 Qb7 16.b4 Rfc8 17.bxc5 Nxc5 18.Bb4 a5 19.Bxc5 Rxc5 20.Qd2 a4 21.Qd4 Rbc8 22.Nh4 Bxg2 23.Nxg2 Qc7 24.Ne3 d5 25.Qd1 dxc4 26.Qxa4 Qc6 27.Qxc6 R5xc6 28.a4 Kf8 29.Red1 Ke8 30.a5 c3 31.Rd4 Bc5 32.Re4 c2 33.Rxc2 Bxe3 34.Rxc6 Bxf2+ 35.Kxf2 Rxc6 36.Ra4 Ra6 37.e4 Kd7 38.h3 Ra7 39.Ke3 Kc6 40.e5 Kb5 41.Rh4 h6 42.Rg4 g6 43.Rh4 h5 44.Rd4 Kxa5 45.Rd8 Kb5 46.Ke4 Kc6 47.Rd3 Rd7 48.Rc3+ Kb7 49.Rc4 Rd1 50.Rc3 Rf1 51.Kd4 g5 52.Rb3+ Kc7 53.Ra3 Kd8 54.Ra7 Ke8 55.Kc5 Kf8 56.h4 g4 57.Ra8+ Kg7 58.Ra3 Rf3 59.Kb4 Kg6 60.Rb3 Kf5 61.Kc4 Rxb3 62.Kxb3 Kxe5 63.Kc4 Ke4 64.Kb4 Kf3 65.Kc4 e5 66.Kd5 e4 67.Kd6 e3 68.Ke7 e2 69.Kxf7 e1=Q 70.Kg6 Qe5 71.Kf7 Kxg3 72.Kg6 Kxh4 73.Kf7 Kg5 74.Kg8 Qe7 75.Kh8 Kg6 76.Kg8 Qg7#
- By rocket (****) Date 2020-03-21 15:02 Edited 2020-03-21 16:40
WCCC are not statistically valid results of any sort but I did look it up and Fritz 2 came in 5th, undefeated in the tournament.

https://www.chessprogramming.org/WCCC_1992

They later won in 1995 defeating Deep Blue.

It was probably the positionally strongest engine based on my tests. I mean I beat it most of the time, but I've looked around how it plays opening by itself and it seems to play surprisingly accurate. It doesn't weaken it's kingside either. No ugly pawn pushes. Material value is sound as well.

For instance, in the Bxc6 Berlin, Fritz 2 understands to play nd2. It plays some of the c3 Ruy lopez by itself (believe it or not), while most engines to this day do not understand the slower plan of c3,d4, and instead opts for Nc3. I have tried just about every engine and Fritz is the only one that understands this pawn center idea in the Ruy.
- By rocket (****) Date 2020-03-21 16:39 Upvotes 1
Now, I'm gonna examine how strong tactically a portable single core engine was in 1992. Maximum allotted time tournament time control is around 2 minutes and 50 seconds (standard ponder time for tournament time controls)

Paul Morphy vs Duke Karl / Count Isouard (10.Nxb5).

Fritz 2 solved it: 2:37

1.e4 e5 2.Nf3 d6 3.d4 Bg4 4.dxe5 Bxf3 5.Qxf3 dxe5 6.Bc4 Nf6 7.Qb3 Qe7 8.Nc3 c6 9.Bg5 b5 10.Nxb5 cxb5 11.Bxb5+ Nbd7 12.O-O-O Rd8 13.Rxd7 Rxd7 14.Rd1 Qe6 15.Bxd7+ Nxd7 16.Qb8+ Nxb8 17.Rd8# 1-0

Rybka 3 vs me (I played rxh1 which is mate in 9)

Fritz 2: solved it instantly at blitz time controls

1. d4 d6 2. e4 Nc6 3. Nf3 a6 4. Bd3 e5 5. d5 Nce7 6. O-O Nf6 7. Na3 Ng6 8. Be3 Ng4 9. Bd2 Nf6 10. c4 Be7 11. h3 O-O 12. Be3 Nd7 13. Qd2 a5 14. Bc2 b6 15. Ba4 Nc5 16. Bxc5 bxc5 17. Bc6 Ra7 18. Nb5 Ra6 19. Rae1 f5 20. Qd1 f4 21. Qd3 Nh4 22. Rc1 Nxf3 23. Qxf3 g5 24. Rfe1 Kg7 25. Rc3 Kg6 26. Rd1 h5 27. Qe2 g4 28. hxg4 hxg4 29. Rb3 Bh4 30. Qd2 Bg5 31. Ra3 f3 32. Qc3 Bf4 33. g3 Rh8 34. Be8 Rxe8 35. Rxa5 Rh8 36. Rxa6 Bxa6 37. b4 Rh1 38. Kxh1 Qh8 39. Kg1 Qh3 40. Qxf3 gxf3 41. Rc1 Qg2#

Kasparov- Karpov 2009 (22..Nf6+)
Fritz 2 failed after 2:53 minutes ponder

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 c6 6. Qc2 Bd6 7. Bxd6 Qxd6 8. e3 Ne7 9. Bd3 Nd7 10. Nge2 h6 11. O-O O-O 12. a3 a5 13. Rad1 b6 14. e4 dxe4 15. Nxe4 Qb8 16. N2c3 Ba6 17. Bxa6 Rxa6 18. d5 Nxd5 19. Nxd5 cxd5 20. Rxd5 Ra7 21. Qd2 Nc5 22. Nf6+ gxf6 23. Qxh6 f5 24. Qg5+ Kh8 25. Qf6+ Kg8 26. Rxf5 Ne4 27. Qh4 Re8 28. Rh5 f5 1-0

Louis Paulsen vs Paul Morphy (17.. Qxf3)

Fritz 2 failed and opts for Qxa6 instead

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Re8 7. Nxc6 dxc6 8. Bc4 b5 9. Be2 Nxe4 10. Nxe4 Rxe4 11. Bf3 Re6 12. c3 Qd3 13. b4 Bb6 14. a4 bxa4 15. Qxa4 Bd7 16. Ra2 Rae8 17. Qa6 Qxf3 18. gxf3 Rg6+ 19. Kh1 Bh3 20. Rd1 Bg2+ 21. Kg1 Bxf3+ 22. Kf1 Bg2+ 23. Kg1 Bh3+ 24. Kh1 Bxf2 25. Qf1 Bxf1 26. Rxf1 Re2 27. Ra1 Rh6 28. d4 Be3 0-1

I'll keep posting these and then make an elo estimate of tactical strength..
- By rocket (****) Date 2020-03-23 16:11
White: Fritz 2.51
Black: me
Tournament time control 40/120/20/60
Result: 0-1

1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.c3 c5 6.Ngf3 Nc6 7.Be2 Be7 8.O-O O-O 9.Re1 a5 10.Bb5 Qb6 11.Qa4 Rd8 12.h3 Nf8 13.Bd3 Bd7 14.Qb3 Qa7 15.dxc5 Bxc5 16.Re2 a4 17.Qc2 Ng6 18.b4 axb3 e.p. 19.Nxb3 Be7 20.Nbd4 Nxd4 21.cxd4 Rdc8 22.Qd2 b5 23.Rb1 b4 24.Rb2 Ba4 25.Re1 Rc7 26.Kh1 Rac8 27.Bb1 Rc3 28.Ng1 Bb5 29.Rb3 Qa5 30.Ne2 Bxe2 31.Bxg6 hxg6 32.Rxc3 bxc3 33.Qxe2 c2 34.Bd2 Qxa2 35.Qb5 Qc4 36.Qxc4 Rxc4 37.Be3 Rc3 38.Bf4 Kf8 39.Kh2 Ke8 40.Bc1 Ba3 41.Bxa3 Rxa3 42.Rc1 Rc3 43.Kg1 Kd7 44.Kf1 Kc6 45.Ke2 Kb5 46.Kd2 Kc4 47.Rxc2 Rxc2+ 48.Kxc2 Kxd4 49.g3 Ke4 50.Kd2 Kf3 51.Ke1 d4 52.Kf1 d3 53.Ke1 d2+ 54.Kxd2 Kxf2 55.g4 Kg3 56.Ke3 g5 57.Kd4 Kxh3 58.Ke3 Kxg4 59.Ke4 Kg3 60.Kd4 Kf4 61.Kc5 g4 62.Kd6 g3 63.Ke7 Kxe5 64.Kf8 g2 65.Ke7 g1=Q 66.Kd7 Qb6 67.Ke8 Kf6 68.Kd7 e5 69.Kc8 e4 70.Kd7 e3 71.Kc8 e2 72.Kd7 e1=Q 73.Kc8 Qe8#
- By rocket (****) Date 2020-03-25 23:10
White:Me
Black: Fritz 2.51
Time control: 120/40/20/60

1.d4 d5 2.c4 dxc4 3.Nf3 b5 4.a4 c6 5.axb5 cxb5 6.b3 Be6 7.bxc4 Bxc4 8.Nbd2 Nd7 9.Nxc4 bxc4 10.Bd2 Nb6 11.e4 Nf6 12.Qc2 Qd7 13.h3 Qb7 14.d5 e6 15.Bxc4 Nxc4 16.Qxc4 exd5 17.Qa4+ Nd7 18.Ne5 dxe4 19.O-O f5 20.Rab1 Qc7 21.Bf4 Bd6 22.Rfc1 Qd8 23.Rb7 Bxe5 24.Bxe5 Rf8 25.Qc6 Rf7 26.Bd6 e3 27.fxe3 Qg5 28.Kh2 Rd8 29.Rc5 Qxe3 30.Re5+ Qxe5+ 31.Bxe5 g5 32.Bd6 Rf6 33.Qd5 Rg6 34.g4 Rxd6 35.Qxd6 fxg4 36.Qe6+ Kf8 37.Rxd7 Rxd7 38.Qxd7


00:00 Noder: 0
- By rocket (****) Date 2020-03-28 18:49
Very hard to beat it in main line Sicilians at classical/slow chess. I'll keep trying. Last book move I gave it was 6.Be2. We entered main lines regardless

White: Fritz. 2.51
black: me
tc 40/120/20/60
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6 7.O-O Nc6 8.Be3 Be7 9.f4 Bd7 10.Qd3 Qc7 11.Rad1 O-O 12.a3 Rac8 13.Rd2 Rfe8 14.Nf3 Ng4 15.Bf2 Nxf2 16.Rxf2 Na5 17.f5 Nc4 18.Qxc4 Qxc4 19.Bxc4 Rxc4 20.Rd4 Rec8 21.fxe6 fxe6 22.Rd3 R4c5 23.h3 Rf8 24.e5 d5 25.Rdd2 Rc4 26.Ne2 Re4 27.Ng3 Ref4 28.Ne2 R4f7 29.Ned4 Bc5 30.c3 h6 31.Kf1 b5 32.Ke2 Rf4 33.g3 R4f7 34.Ke3 Bb6 35.Rd3 Bc8 36.Rd1 Bc7 37.Rdf1 Bb6 38.Rd1 Bc7 39.Rdf1
- By rocket (****) Date 2020-03-30 04:16
I still can't beat it in main lines sicilians at slow time controls...

But I at least have bragging rights for the 15 move calculation d4!? I'm pretty sure that's deeper than the depth of Fritz 2.

Stockfish says I'm winning with b4 instead, which I thought about but I couldn't find a winning plan.

I didn't include the entire game but it's a dead draw at the end

White Fritz 2.51
Black: me
tc 120/40/20/60 permanent brain on

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6 7.O-O Be7 8.Be3 O-O 9.f4 Nc6 10.Bf3 Qc7 11.a3 Bd7 12.Qe2 Nxd4 13.Bxd4 Bc6 14.Qe3 b5 15.Rad1 Rfe8 16.Bb6 Qb7 17.Ba5 d5 18.e5 Nd7 19.Ne2 g6 20.Nd4 Nb8 21.Rfe1 Bc5 22.g3 Bd7 23.Bc3 Nc6 24.Re2 Rac8 25.Bg2 Nxd4 26.Bxd4 Qa7 27.h3 Rc7 28.c3 Rec8 29.Red2 Bxd4 30.Rxd4 Rc4 31.R1d3 Rxd4 32.Rxd4 Rc4 33.Rd3 Qxe3+ 34.Rxe3 Kf8 35.b3 Rc5 36.Kf2 Ke7 37.Rd3 Rc8 38.Ke3 a5 39.Kf3 d4 40.cxd4 Rc2 41.Bf1 Ra2 42.b4 axb4 43.axb4 Rb2 44.Ke3 Rxb4 45.d5 exd5 46.Rxd5 Rb3+ 47.Rd3 Rxd3+ 48.Kxd3 h5 49.h4
- - By rocket (****) Date 2020-03-30 12:19 Upvotes 1
[an informal blitz match between GM Kasparov and Fritz 2 (i486/33 4MB)
  ended 26:11 (+24 =4 -9).  The world champion estimated Fritz' strength
  in blitz games at around 2650 ELO (add 200 for USCF).  He wants to visit
  the micro WC this year, maybe playing some games against the best programs.b]

https://groups.google.com/forum/m/#!topicsearchin/rec.games.chess/fritz$20AND$20before$3A1993$2F07$2F01/rec.games.chess/q5VfKkHVkdI>
Parent - By MrKris (***) Date 2020-04-01 03:14
Great link, thanks!

TalkChess thread: "[Oldies] What's the speed of a recent SF on a 80486-33 MHz ?"
http://www.talkchess.com/forum3/viewtopic.php?f=2&t=61600&sid=71219c317b6c0cd57b1bbdcbffebf898
" by Jesse Gersenson » Sun Oct 09, 2016 2:01 pm
TEST 1
Machine: Thinkpad 370C
Processor: 486DX 75mHz
RAM: 12MB
OS: windows 95
sf6-mingw3.4.exe bench 1 1 8
==============
Total time (ms) : 318570
Nodes searched : 369287
Nodes/second : 1159
..."

{1MBhash 1cpu 8plies per position, 32 seconds}
- By rocket (****) Date 2020-04-01 11:33
i estimate Fritz 2 to be upwards of 100 elo stronger at tournament time controls/standard chess with permanent brain ON compared to blitz time controls

This is the same opening I crushed it in at blitz (scroll up to see the same variation). This time I had no opportunity to go for an attack. Fritz plays Be6 intending d5, so I have no choice but to keep the tension with Nd5 and head into a different type of game

White: me
Black: Fritz 251
TC: 120/40/60/40

1.e4 c5 2.Nf3 Nc6 3.Nc3 g6 4.g3 Bg7 5.Bg2 d6 6.O-O Nf6 7.d3 O-O 8.Nd2 Be6 9.Nd5 Bxd5 10.exd5 Nd4 11.c3 Nf5 12.a4 a6 13.Nc4 Re8 14.Ne3 Qd7 15.Bh3 e6 16.Nxf5 exf5 17.Bg2 Re7 18.Bf4 Rae8 19.Bf3 b6 20.Qd2 h5 21.Rfe1 Rxe1+ 22.Rxe1 Rxe1+ 23.Qxe1 Qxa4 24.Bxd6 Qc2 25.Be5 Qxd3 26.Bxf6 Bxf6 27.Qe8+ Kg7 28.Kg2 Qc2 29.d6 Qd2 30.d7 f4 31.c4 fxg3 32.hxg3 Qd6 33.Bd5 Qf8 34.Bb7 a5 35.f4 h4 36.g4 g5 37.fxg5 Bxg5 38.Bd5 Be7 39.Kf3 Bd8 40.Qe5+ Bf6 41.Qh5 h3 42.g5 Bd8 43.Qxh3 Bxg5 44.Qf5 Qe7 45.d8=Q Qxd8 46.Qxf7+ Kh6 47.Qe6+ Qf6+ 48.Ke4 Kh5 49.Qxf6 Bxf6 50.b3 Kg5
- By rocket (****) Date 2020-04-02 10:30
White: Fritz 2.51
Black: me
TC 120/40/20/60

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.Be2 e6 6.O-O Be7 7.c4 Nb6 8.Nc3 O-O 9.Be3 Nc6 10.exd6 cxd6 11.d5 Bxf3 12.Bxf3 Ne5 13.b3 Nxf3+ 14.Qxf3 e5 15.Rfe1 a5 16.Rac1 Nd7 17.a3 f5 18.h3 e4 19.Qh5 Ne5 20.Rc2 g6 21.Qe2 Nd3 22.Rd1 Bf6 23.f3 Bxc3 24.Rxc3 Qe7 25.fxe4 fxe4 26.Bd4 Rfe8 27.Rf1 Qd7 28.a4 Qe7 29.Qe3 Rf8 30.Rxf8+ Kxf8 31.g3 Nc5 32.Kf1 Kg8 33.Kg2 Rf8 34.Qe2 b6 35.Re3 Re8 36.Qg4 Qd7 37.Qh4 Qf5 38.Qh6 Re7 39.g4 Qf8 40.Qh4 Re8 41.Qg3 Qe7 42.g5 Nd7 43.Qf4 Nc5 44.h4 Nd7 45.Kg1 Qf8 46.Rxe4 Qxf4 47.Rxf4 Rf8 48.Rxf8+ Kxf8 49.Kf2 Nc5 50.Ke2 Ke7 51.Ke3 Kd7 52.Bxc5 bxc5
- By rocket (****) Date 2020-04-04 02:18
White: Fritz 2.51
Black:me
TC: 120/40/20/60
Result: 0-1

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bb5 Bd7 7.Nxc6 bxc6 8.Bc4 e5 9.Rb1 Be7 10.O-O O-O 11.Qd3 Qc7 12.Rd1 h6 13.Qg3 Kh8 14.Be3 Kh7 15.a3 a5 16.h3 Nh5 17.Qf3 Nf6 18.Ne2 Rab8 19.Ng3 Be6 20.Bxe6 fxe6 21.Nh5 Nxh5 22.Qxh5 d5 23.Qg4 Rf6 24.Qe2 d4 25.Bd2 Qb6 26.b4 axb4 27.Bxb4 Bxb4 28.Rxb4 Qc7 29.Rxb8 Qxb8 30.a4 Qb4 31.Qa6 c5 32.Qb5 Qxb5 33.axb5 Rf7 34.b6 Rb7 35.Rb1 Kg6 36.f3 Kf6 37.Rb5 Ke7 38.Rxc5 Rxb6 39.Rc7+ Kd6 40.Rxg7 Rc6 41.Rh7 Rxc2 42.Rh8 h5 43.Kf1 h4 44.Ke1 Rxg2 45.Rxh4 d3 46.Rh8 Kc5 47.Rd8 Kc4 48.Kf1 Rh2 49.Kg1 Re2 50.Kf1 Kc3 51.h4 Kd2 52.Rb8 Ke3 53.Rb3 Rh2 54.Ra3 Rxh4 55.Rb3 Rh1+ 56.Kg2 Rc1 57.Kg3 Ke2 58.Kg2 d2 59.Rb2 Ke1 60.Rxd2 Kxd2 61.Kf2 Kd3 62.Kg3 Ke3 63.Kg4 Rg1+ 64.Kh4 Kf4 65.Kh5 Kxf3 66.Kh4 Kxe4 67.Kh5 Kf5 68.Kh6 Rg6+ 69.Kh5 e4 70.Kh4 e3 71.Kh5 e2 72.Kh4 e1=Q+ 73.Kh3 Qh1#
- By rocket (****) Date 2020-04-04 19:06 Upvotes 1
White: Fritz 2.51
Black:me
TC: 120/40/20/60
result 0-1
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Nbd7 8.O-O Qc7 9.Bg5 h6 10.Bh4 g5 11.Bg3 Rb8 12.Qd3 b6 13.Rfd1 Be7 14.Rd2 Bb7 15.a4 O-O 16.Rad1 Rbc8 17.Bf3 Qc4 18.a5 b5 19.Qe3 Kg7 20.Be2 Qc6 21.Nd5 Nxd5 22.exd5 Qc7 23.h3 f5 24.Bh2 Bf6 25.Re1 Nc5 26.Nxc5 Qxc5 27.Qb3 Rc7 28.Red1 Bc8 29.c3 Re8 30.Re1 Rce7 31.Qc2 e4 32.Red1 f4 33.Bh5 Rf8 34.Re2 Bf5 35.g4 Bh7 36.Qb3 Rc7 37.Ra1 Qc4 38.Qxc4 Rxc4 39.h4 Rb8 40.Ree1 Bg8 41.Rad1 Be5 42.hxg5 hxg5 43.Kf1 b4 44.b3 Rxc3 45.Rxe4 Rxb3 46.Bg1 Rc3 47.f3 Kf6 48.Bb6 b3 49.Rb4 Rbc8 50.Bf2 Rc1 51.Re1 Rxe1+ 52.Bxe1 b2 53.Ke2 Rc1 54.Rxb2 Bxb2 55.Bd2 Rc5 56.Bb4 Rxd5 57.Kf2 Bf7 58.Bxf7 Kxf7 59.Ke2 Ke6 60.Bd2 Kd7 61.Ke1 Kc6 62.Ke2 Bf6 63.Be1 Bd8 64.Bc3 Bxa5 65.Bg7 Bb4 66.Bf6 a5 67.Kf2 a4 68.Kf1 a3 69.Ke2 a2 70.Ba1 Bc5 71.Kf1 Bd4 72.Kg2 Bxa1 73.Kh2 Bc3 74.Kg2 a1=Q 75.Kh2 Rd2+ 76.Kh3 Qh1#
- By rocket (****) Date 2020-04-05 21:28 Edited 2020-04-05 21:37
White: Fritz 2.51
Black:me
tc 120/40/20/60
Result:0-1

1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bg5 Bg7 5.e3 O-O 6.Bd3 c6 7.O-O Nbd7 8.Ne2 Nb6 9.h3 h6 10.Bf4 Be6 11.a3 Nc8 12.b3 Nd6 13.Be5 Qd7 14.Ng3 Rfe8 15.c3 Qc8 16.Re1 Nf5 17.Ne2 Nd6 18.Bxd6 exd6 19.Qc2 Qd8 20.Nf4 Bc8 21.Rad1 Qe7 22.Rc1 Ne4 23.Nd2 h5 24.Bxe4 dxe4 25.Rcd1 Bf5 26.c4 Kh7 27.Nb1 Rh8 28.Nc3 Kg8 29.Nfe2 h4 30.d5 c5 31.Nf4 g5 32.Nfe2 Bg6 33.Rd2 Re8 34.Nc1 Rh5 35.N1e2 Qd7 36.Red1 Rh6 37.Rc1 Re5 38.Rcd1 Bf5 39.Nb5 b6 40.Rb1 Re7 41.Rc1 Rg6 42.Nbc3 Be5 43.Rcd1 Rg7 44.b4 g4 45.hxg4 Rxg4 46.Kh1 f6 47.bxc5 bxc5 48.Rb1 Bh7 49.Rb8+ Kg7 50.Ng1 Bf5 51.Rd1 Kh7 52.Nge2 Bg6 53.Rdb1 Qf5 54.R8b7 Rxb7 55.Rxb7+ Kh6 56.Ng1 Bxc3 57.Qxc3 Qxf2 58.Rb2 Qf1 59.Kh2 Qf5 60.Nh3 Qe5+ 61.Qxe5 fxe5 62.Rb7 Rg3 63.Rxa7 Rxe3 64.Ra6 Rd3 65.Rxd6 e3 66.Re6 e4 67.Nf4 e2 68.Rxg6+ Kh7 69.Nxe2 Kxg6 70.a4 Kf5 71.a5 Ke5 72.Kg1 e3 73.a6 Ra3 74.g3 hxg3 75.Nxg3 Kf4 76.Kg2 Ra2+ 77.Kh3 Kf3 78.d6 Rxa6 79.Nf5 Ra7 80.Nh4+ Kf2 81.Kg4 e2 82.d7 Rxd7 83.Nf3 e1=Q 84.Nxe1 Kxe1 85.Kf5 Rd4 86.Ke6 Kd2 87.Ke5 Kc3 88.Ke6 Kxc4 89.Ke5 Rd1 90.Ke4 Re1+ 91.Kf3 Kd4 92.Kf2 Re8 93.Kf3 c4 94.Kf4 c3 95.Kg4 c2 96.Kg5 c1=Q+ 97.Kg6 Qf1 98.Kg7 Re7+ 99.Kg6 Qf7+ 100.Kg5 Re6 101.Kh4 Rg6 102.Kh5 Qh7#
- By rocket (****) Date 2020-04-05 22:59 Edited 2020-04-05 23:32
Passed pawn pruning effect on move 56.

It takes Fritz 2.51 3:59 in the post game analysis to get the correct PV of the (wrong line) with Rxg6?? where black recaptures the Knight instead of the rook (to get two connected pawns, of which one is unstoppable). This is easily detected in the search if Fritz continued down the line after the rook moves away and Eyes down on them (in fact the very next move). But pruning in the search makes the line unprioritized until around 3:50

This suggests to me that there was in fact no passed pawn bonuses in early Fritz, otherwise such lines would have been looked at deeper right away.  This surprises me. Why wasn't passed pawn bonuses included alongside the other knowledge?
- By rocket (****) Date 2020-04-21 23:39
White: Fritz 2.51
Black: Me

TC 120/40
Result 0-1

1.e4 c5 2.Nf3 Nc6 3.Nc3 g6 4.g3 Bg7 5.Bg2 d6 6.O-O Nf6 7.d3 O-O 8.Bg5 h6 9.Bf4 e5 10.Be3 Ng4 11.Bd2 Nf6 12.Be3 Be6 13.Qc1 Kh7 14.a3 Nd7 15.Nb5 Nb6 16.Rd1 a6 17.Nc3 f5 18.Re1 Qf6 19.Qd1 f4 20.gxf4 exf4 21.Bd2 Bg4 22.h3 Bh5 23.Qc1 g5 24.Rb1 Ne5 25.Nxe5 dxe5 26.Nd5 Nxd5 27.exd5 g4 28.Ra1 f3 29.Bf1 Qh4 30.Re4 Rg8 31.Be3 Bf6 32.Kh1 Be7 33.Bxh6 Rg6 34.Be3 Rag8 35.c4 Qf6 36.Qc3 Bd6 37.Re1 gxh3 38.Kh2 Bg4 39.Qb3 Qh4 40.Qxb7+ R8g7 41.Qc6 Qh5 42.Rxg4 Qxg4 43.Bxh3 Qh4 44.Qc8 Rg2+ 45.Kh1 e4 46.Qf5+ Kh8 47.Bf4 Bxf4 48.Qf8+ Rg8 49.Qf6+ Qxf6 50.Bxg2 Rxg2 51.dxe4 Qh4#
- By rocket (****) Date 2020-04-21 23:53 Upvotes 1
Boom!

White: Me
Black: Fritz 2.51

TC 120/40
Result:0-1

1.e4 c5 2.Nc3 Nc6 3.Nf3 g6 4.g3 Bg7 5.Bg2 d6 6.O-O Nf6 7.d3 O-O 8.Re1 Bg4 9.h3 Bxf3 10.Qxf3 Qb6 11.Qd1 Rae8 12.Kh2 a6 13.f4 e5 14.f5 Nd4 15.g4 gxf5 16.exf5 h6 17.Rg1 Re7 18.Nd5 Nxd5 19.Bxd5 Rc7 20.c3 Nc6 21.g5 hxg5 22.Rxg5 c4 23.Qh5 Qf2+ 24.Rg2 Qxg2+ 25.Kxg2 Ne7 26.dxc4 Nxd5 27.cxd5 Re8 28.Qg4 Kf8 29.Bg5 f6 30.Be3 b5 31.Qg6 Rb7 32.Bh6 Rf7 33.Kf3 Bxh6 34.Qxh6+ Ke7 35.Rg1 Rc8 36.Rg7 Rf8 37.h4 Ke8 38.h5 a5 39.Qg6 Ke7 40.Rxf7+ Rxf7 41.h6 b4 42.h7 Rxh7 43.Qxh7+ Kd8 44.Qf7 Kc8 45.Ke4 bxc3 46.bxc3 a4 47.c4 Kb8 48.c5 dxc5 49.d6 Ka8 50.Qc7 c4 51.d7 a3 52.d8=Q#
- By rocket (****) Date 2020-04-22 22:15
White:me
Black: Fritz 2.51
Result: 1-0

1.c4 e5 2.Nc3 Nf6 3.g3 Bb4 4.Bg2 Nc6 5.e4 d6 6.Nge2 Bg4 7.h3 Bh5 8.g4 Bg6 9.d3 h6 10.Be3 O-O 11.f4 a6 12.f5 Bh7 13.Ng3 b5 14.h4 bxc4 15.g5 Nd7 16.dxc4 Na5 17.Bf1 Nb6 18.Nh5 Naxc4 19.Bc1 hxg5 20.hxg5 Bxc3+ 21.bxc3 Re8 22.Nxg7 Bxf5 23.exf5 Re6 24.fxe6 Qxg5 25.Bxg5 Nd2 26.Bxd2 fxe6 27.Qg4 Kf8 28.Rh8+ Kf7 29.Qxe6+ Kxg7 30.Qh6+ Kf7 31.Rh7+ Ke8 32.Qe6+ Kd8 33.Rh8#
- - By rocket (****) Date 2020-04-24 14:24
This eventful Najdorf game (last book move 9 0-0-0) ended in a draw.

White: Fritz 2.51
Black:me
TC 120/40
Result: Draw

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7 9.O-O-O Nc6 10.Nxc6 Qxc6 11.g3 b5 12.Bg2 Bb7 13.Qd3 Qc7 14.Bxf6 gxf6 15.Rd2 Rc8 16.h3 Qc4 17.Rg1 Qxd3 18.Rxd3 O-O 19.Kd2 Rfd8 20.a3 Rc4 21.Bf3 Rdc8 22.Rd1 f5 23.exf5 Bxf3 24.Rxf3 d5 25.Re1 d4 26.Ne2 Rxc2+ 27.Kd3 Rxb2 28.Nxd4 Bf6 29.fxe6 Rd8 30.e7 Rxd4+ 31.Ke3 Rb3+ 32.Kf2 Rxf3+ 33.Kxf3 Bxe7 34.Rxe7 Kf8 35.Re3 a5 36.Rb3 Ra4 37.Kg4 b4 38.axb4 Rxb4 39.Rc3 Rb5 40.Rc7 Ke8 41.Ra7 h5+ 42.Kf3 f5 43.h4 Kf8 44.Kf2 Kg8 45.Ke3 Rb3+ 46.Kd4 Rxg3 47.Ke5 Rg4 48.Kxf5 Rxh4 49.Rxa5 Kf7 50.Ra1 Rh2 51.Kg5 h4 52.Kg4 Rg2+ 53.Kxh4 Kf6 54.Ra8 Rg1 55.Rf8+ Ke7 56.Rb8 Kf6 57.Kh3 Kf7 58.Rb6 Ke7 59.Kh4 Kf7 60.Kh5 Kg7 61.f5 Rh1+ 62.Kg5 Rg1+ 63.Kh4 Rh1+ 64.Kg4 Rg1+ 65.Kf4 Rf1+ 66.Ke5 Re1+ 67.Kd4 Rd1+ 68.Ke4 Re1+ 69.Kd5 Rd1+ 70.Ke6 Re1+ 71.Kd7 Rf1 72.f6+ Rxf6 73.Rxf6 Kxf6
Parent - By Vinvin (***) Date 2020-04-26 21:18 Upvotes 1
This game with graph eval on Lichess :
https://lichess.org/MoJo4psb
- By rocket (****) Date 2020-04-24 14:35
I tried tricking the materialistic Fritz with 42... f5, hoping it would stear towards the pawn and grab it, while I push my a-pawn and gain time to put my rook (crucial winning try) behind the pawn

But Fritz did not fall for any of it.
- By rocket (****) Date 2020-04-25 19:28
Now I tried my luck with the Caro-Kann Defence, Karpov variation. Fritz doubles my pawns and gets the bishop pair but in practise, all the cards favor black.

White:Fritz 2.51
Black:Me
120/40

[Event "120'/40"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Fritz 2.51"]
[Black "Me"]
[Result "0-1"]
[PlyCount "142"]
[TimeControl "40/7200:0/0:0/0"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. c3 Ngf6 6. Bd3 Nxe4 7. Bxe4 Nf6 8. Bc2 Bg4 9. Ne2 e6 10. f3 Bh5 11. Nf4 Bg6
12. Nxg6 hxg6 13. O-O Bd6 14. h3 Bc7 15. Bg5 Qd6 16. f4 O-O-O 17. Qf3 Rh5 18.
Qg3 Rdh8 19. Qe3 Nd5 20. Qf3 Rf8 21. Rad1 f6 22. Bxg6 Rhh8 23. c4 Ne7 24. c5
Qd7 25. f5 exf5 26. Bxf5 Qxf5 27. Qxf5+ Nxf5 28. Rxf5 fxg5 29. Rxg5 Rf7 30. d5
Bf4 31. Rg4 Be3+ 32. Kh2 cxd5 33. Rxd5 Rd8 34. Rxd8+ Kxd8 35. b4 g5 36. Re4 Re7
37. Rxe7 Kxe7 38. Kg3 Bd2 39. a3 Ke6 40. Kg4 Kd5 41. g3 a6 42. h4 gxh4 43. gxh4
Kc4 44. Kf3 Kb3 45. Ke4 Kxa3 46. Kd3 Bxb4 47. Kc4 Bd2 48. h5 Ka4 49. c6 bxc6
50. Kd3 Bh6 51. Kc4 Ka3 52. Kc3 a5 53. Kc4 Kb2 54. Kd4 a4 55. Ke5 a3 56. Kf5 a2
57. Kg6 Bd2 58. Kf6 a1=Q 59. Kg6 Qf1 60. h6 {0} Bc3 61. h7 Qf6+ 62. Kh5 Qg7 63.
h8=Q Qxh8+ 64. Kg4 Qf6 65. Kg3 Qf5 66. Kg2 Qf4 67. Kh3 Be1 68. Kg2 Qg3+ 69. Kh1
Qg4 70. Kh2 Bf2 71. Kh1 Qh3# 0-1

- - By rocket (****) Date 2020-04-29 00:59 Upvotes 1
Now Najdorf with me as white. I I first stop all counter play with Qb1.. Any knight move from my side leads to Nc5.. Black also has e4 counter play ideas. So  need to regroup my pieces, then I launch the attack.

White:Me
Black: Fritz 2.51
Result:1-0

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.Be3 O-O 9.O-O b6 10.Qd3 Bb7 11.Rad1 Nbd7 12.a4 Qc7 13.f3 Rfd8 14.Nd5 Nxd5 15.exd5 Rac8 16.c4 Re8 17.Qb1 h6 18.Rc1 Qd8 19.Qd3 Bf6 20.Rc2 Qc7 21.Rfc1 a5 22.Kh1 Nb8 23.Qf5 Nd7 24.Bd3 g6 25.Qh3 h5 26.Be4 Bg7 27.g4 Nf6 28.g5 Nxe4 29.fxe4 Rf8 30.Rf1 Rce8 31.Nd2 Rd8 32.b3 Ra8 33.Qg3 Rab8 34.Nf3 Ba6 35.Rfc1 Rfc8 36.Nh4 Rb7 37.Rf2 Ra7 38.Qh3 Raa8 39.Nf5 gxf5 40.exf5 Bb7 41.Rd1 h4 42.Qxh4 Bh8 43.Rf3 Bg7 44.f6 Bxd5 45.Rxd5 Qd7 46.Rh3 Qxh3 47.Qxh3 Bf8 48.Qh5 Rc7 49.Bxb6 Rac8 50.Bxc7 Rxc7 51.Rd3 Rxc4 52.bxc4 Bg7 53.Rh3 d5 54.Qh7+ Kf8 55.Qxg7+ Ke8 56.Rh8+ Kd7 57.Qxf7+ Kc6 58.Qxd5+ Kb6 59.Rb8+ Kc7 60.Rb7+ Kc8 61.Qd7#
Parent - By MrKris (***) Date 2020-04-29 11:47
Nice 39.Nf5 topping off your attack.

While you "regroup my pieces" Fritz 'regrouped' differently:
From 13.f3 through 47...Bf8:
- R begining on f8, 4 moves ending on c8 (far from its K)
- R begining on a8, 7 moves ending on a8 (same square, far from its K)
- Q begining on c7, 4 moves ending with 46...Qx(R)h3
- B begining on b7, 3 moves ending 44...Bx(p)d5 (Bb7-a6-b7 1st)
- N begining on d7, 4 moves ending 28...Nx(B)e4 (Nd7-b8-d7-f6 1st)
- B begining on e7, 5 moves ending 47...Bf8 (with 42...Bg7-h8-g7-f8)
Not to say anything against your patient build-up though.

[Event ""]
[Site ""]
[Date ""]
[Round ""]
[White "rocket"]
[Black "Fritz 2.51"]
[Result "1-0"]
[ECO "B92"]
[Opening "Sicilian"]
[Time "03:58:32"]
[Variation "Najdorf, 6.Be2 e5 7.Nb3 Be7 8.O-O O-O 9.Be3"]
[Termination "normal"]
[PlyCount "121"]
[WhiteType "human"]
[BlackType "computer"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8.
Be3 O-O 9. O-O b6 10. Qd3 Bb7 11. Rad1 (11. Nd5 {in 2010, Cunha e
Silva-2057 0-1 Bittencourt-2440, 39 moves} Nxd5 12. exd5 Nd7 13. Rab1 Bg5
14. f4 exf4 15. Bxf4 Bxf4 16. Rxf4 Ne5 17. Qg3 Bc8 18. Nd2 Qe7 {=+ Bluefish 1
min. -0.21/35 19.Nb3}) 11. .. Nbd7 12. a4 Qc7 13. f3 Rfd8 14. Nd5 Nxd5 15.
exd5 Rac8 16. c4 Re8 17. Qb1 h6 18. Rc1 Qd8 19. Qd3 Bf6 20. Rc2 Qc7 21.
Rfc1 a5 22. Kh1 Nb8 23. Qf5 Nd7 24. Bd3 g6 25. Qh3 h5 26. Be4 Bg7 27. g4
Nf6 28. g5 Nxe4 29. fxe4 Rf8 30. Rf1 Rce8 31. Nd2 Rd8 32. b3 Ra8 33. Qg3
Rab8 34. Nf3 Ba6 35. Rfc1 Rfc8 36. Nh4 Rb7 37. Rf2 Ra7 38. Qh3 Raa8 39. Nf5 {Bf ! +1.94 1 min. with 39...Rf8}
gxf5 40. exf5 Bb7 41. Rd1 h4 42. Qxh4 Bh8 43. Rf3 {Bf +M16 43.f6} Bg7 44.
f6 {Bf +M12} Bxd5 45. Rxd5 Qd7 46. Rh3 {+-} (46. fxg7 {Bf +M10} Kxg7 47. g6 {!} fxg6
48. Qh6+ Kg8 49. Qxg6+ Kh8 50. Qf6+ Qg7 51. Rh3+ Kg8 52. Qe6+ Qf7 53. Rg3+
Kh8 54. Qxf7 Rxc4 55. Qg7#) 46. .. Qxh3 47. Qxh3 Bf8 48. Qh5 Rc7 49. Bxb6
Rac8 50. Bxc7 Rxc7 51. Rd3 Rxc4 52. bxc4 Bg7 53. Rh3 d5 54. Qh7+ Kf8 55.
Qxg7+ Ke8 56. Rh8+ Kd7 57. Qxf7+ Kc6 58. Qxd5+ Kb6 59. Rb8+ Kc7 60. Rb7+
Kc8 61. Qd7# 1-0
- By rocket (****) Date 2020-05-02 20:28 Upvotes 1
White: Fritz 2.51
Black:me
result 0-1
Opening French Defence

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.Nf3 c5 6.Nb5 Qb6 7.c3 a6 8.Qa4 c4 9.Na3 Qc6 10.Qxc6 Nxc6 11.Nc2 b5 12.g3 Be7 13.Bg2 O-O 14.O-O Rb8 15.a3 Nb6 16.Bg5 Bxg5 17.Nxg5 Bd7 18.f4 h6 19.Nf3 Na4 20.Rab1 h5 21.Ne3 g6 22.Rfe1 Rb6 23.Re2 Rfb8 24.h3 a5 25.Rc2 b4 26.axb4 axb4 27.Ra1 Na5 28.Kh2 b3 29.Re2 Ra6 30.Ng5 Bc6 31.g4 hxg4 32.Nxg4 Rba8 33.Nh6+ Kf8 34.Nhxf7 Nb7 35.Nd6 Ke7 36.Rae1 Nd8 37.Kg3 Nb6 38.Kg4 Ra1 39.Rxa1 Rxa1 40.Rf2 Ra2 41.Nf3 Na4 42.Nh4 Rxb2 43.Nxg6+ Kd7 44.Rxb2 Nxb2 45.f5 Nd3 46.fxe6+ Kxe6 47.Nf8+ Ke7 48.Ng6+ Kd7 49.Nxc4 dxc4 50.d5 Bxd5 51.Bxd5 b2 52.Bxc4 b1=Q 53.Kg5 Qf1 54.h4 Ne6+ 55.Kh6 Qh3 56.Bxd3 Qxd3 57.c4 Qf5 58.c5 Nxc5 59.Kg7 Ne6+ 60.Kh6 Nf4 61.Nxf4 Qxf4+ 62.Kh7 Qxh4+ 63.Kg6 Ke6 64.Kg7 Ke7 65.Kg6 Qg4+ 66.Kh6 Kf7 67.e6+ Kxe6 68.Kh7 Kf7 69.Kh6 Qh4#
- By rocket (****) Date 2020-05-04 23:14
Fritz 2.51
Black:me
120/40
Result: 0-1

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d6 5. e4 O-O 6. Be2 e5 7. d5 a5 8. O-O Na6 9. Be3 h6 10. Qc1 Kh7 11. Rd1 b6 12. h3 Nc5 13. Qc2 Bd7 14. b3 Qe7 15. a3 Qe8 16. Rab1 Kg8 17. Rb2 Nh7 18. Rd2 f5 19. Bxc5 bxc5 20. Bd1 f4 21. Rd3 g5 22. Nd2 h5 23. b4 axb4 24. axb4 cxb4 25. Rxb4 g4 26. hxg4 hxg4 27. Rb7 Ng5 28. Rxc7 f3 29. Re3 Qf7 30. gxf3 Rad8 31. Nb5 Qf4 32. Nxd6 g3 33. Nf1 Nh3 34. Kg2 gxf2 35. Rxd7 Rxd7 36. Kxh3 Rxd6 37. Qxf2 Rh6 38. Kg2 Rg6 39. Kh1 Bh6 40. Bc2 Bg5 41. Rb3 Rg7 42. Qe2 Rf6 43. Nh2 Rh6 44. Rb8 Kh7 45. Rb1 Qh4 46. Rb6 Rxb6 47. d6 Rxd6 48. Qg2 Rd2 49. f4 Rxg2 50. Kxg2 Bxf4 51. Ng4 Rxg4 52. Kf3 Qh3 53. Ke2 Rg2 54. Kd1 Qh1#

- By rocket (****) Date 2020-05-12 02:08
My best game so far? Fritz put up more resistance here. I turned off the opening book and let it ponder for itself right away.  See how it thinks 1.b3 (Larsen opening) should be countered. My own opening moves were played instinctively.

We reached fairly orthodox waters when I played d4. Some of the suicidal moves late in the game is when all moves lose, so engines play kamikaze then.

White:Me
Black:Fritz 2.51
120/40
1-0

1.b3 d5 2.Bb2 Nf6 3.e3 e6 4.Nf3 Be7 5.d4 c5 6.Nbd2 cxd4 7.exd4 O-O 8.Bd3 Nc6 9.a3 b6 10.O-O Bb7 11.Re1 Nh5 12.b4 Nf4 13.Bf1 Rc8 14.g3 Ng6 15.Bd3 Bf6 16.h4 Re8 17.h5 Nge7 18.Ne5 a6 19.Qe2 b5 20.Nb3 Nf5 21.Qg4 Nh6 22.Qf3 Nxe5 23.dxe5 Be7 24.Nd4 Qc7 25.g4 Bg5 26.Re2 Qe7 27.Rae1 Red8 28.Rf1 Ba8 29.Qg3 Bh4 30.Qg2 g5 31.hxg6 e.p. hxg6 32.f4 g5 33.f5 exf5 34.gxf5 Qa7 35.Qh3 Rb8 36.Kh2 f6 37.e6 Qc7+ 38.Kg2 Qe7 39.Rg1 Qc7 40.Qh2 Rbc8 41.Kf1 Qxh2 42.Rxh2 Kf8 43.Nf3 Ng8 44.Nxh4 gxh4 45.Rxh4 Ke7 46.Bd4 Kd6 47.Rg7 Rc7 48.Rxc7 Kxc7 49.Rh7+ Kb8 50.Rf7 Re8 51.Be2 Kc8 52.Bh5 Ne7 53.Rxf6 Rh8 54.Bf3 Nc6 55.c3 Nxd4 56.cxd4 Kd8 57.Rg6 Kc7 58.Rg7+ Kb6 59.e7 Bc6 60.f6 Be8 61.f7 Bxf7 62.Rxf7 Re8 63.Bh5 Kc7 64.Rh7 Kd7 65.Bxe8+ Kxe8 66.Kf2 Kd7 67.Kf3 Ke8 68.Kf4 Kd7 69.Ke5 a5 70.bxa5 b4 71.axb4 Ke8 72.a6 Kd7 73.a7 Kc6 74.a8=Q+ Kb5 75.Qxd5+ Kxb4 76.Qc5+ Kb3 77.Rh3+ Kb2 78.Qb4+ Kc1 79.Qc3+ Kd1 80.Rh1+ Ke2 81.Qe1+ Kd3 82.d5 Kc4 83.d6 Kd3 84.d7 Kc2 85.d8=Q Kb2 86.Qd4+ Ka2 87.Qa4+ Kb2 88.Qd2#
- - By rocket (****) Date 2020-05-15 19:14 Upvotes 1
This one looked to be an easy conversion at the beginning but turned into a roller coaster with blunders back and forward.

I had a nice tactical sequence at the end though that put the nail in the coffin (75 Bxg4!!)

White: Fritz 2.51
Black:me
120/40
result 0-1

1.d4 d6 2.c4 Nf6 3.Nc3 e6 4.Nf3 Be7 5.e3 O-O 6.Bd3 Nbd7 7.O-O Re8 8.b3 Bf8 9.Bb2 g6 10.a3 Bg7 11.Bc2 a6 12.e4 e5 13.dxe5 Nxe5 14.Nxe5 dxe5 15.Qe2 c6 16.Rad1 Qe7 17.Rd3 Nh5 18.g3 Nf6 19.Rfd1 Be6 20.Nb1 Qc7 21.Rd6 Nd7 22.Nc3 Bf8 23.R6d2 b5 24.cxb5 axb5 25.a4 b4 26.Na2 c5 27.Nc1 Nb8 28.Qe3 Nc6 29.Bd3 Nd4 30.Bf1 Red8 31.Bg2 Rac8 32.Bf1 Bg7 33.f3 h5 34.Ba6 Ra8 35.Bf1 Qe7 36.Be2 Kh7 37.Kh1 h4 38.Qf2 hxg3 39.hxg3 Rh8 40.Rd3 Bf6 41.Kg2 Kg7 42.Rh1 Rxh1 43.Kxh1 Rh8+ 44.Kg2 Qb7 45.Bd1 Rh7 46.a5 Qa8 47.Ba1 Qh8 48.Qg1 Qa8 49.Qf2 Qxa5 50.Bb2 Qb5 51.Bc2 Qc6 52.Bd1 Rh8 53.Bc2 Bg5 54.Bd1 Bh6 55.Bc2 Rf8 56.Rd1 f6 57.Rd3 Kg8 58.Rd1 Bg7 59.Rd3 f5 60.Rd1 f4 61.g4 Bf6 62.Rh1 Rf7 63.Nd3 Qb5 64.Ra1 Rh7 65.Ra8+ Kg7 66.Ra7+ Kh8 67.Ra8+ Bg8 68.Rc8 Bh4 69.Qf1 Bg3 70.Rxc5 Rh2+ 71.Kg1 Qb6 72.Bxd4 exd4 73.Qa1 Qf6 74.Qb2 Be6 75.Rb5 Bxg4 76.Rb8+ Kh7 77.Rb7+ Kh6 78.fxg4 Qh4 79.g5+ Qxg5 80.Rh7+ Kxh7 81.Bd1 Rxb2 82.Nxb2 Bh4+ 83.Kf1 Qg3 84.Nd3 Qxd3+ 85.Kg2 Qg3+ 86.Kh1 f3 87.Bxf3 Qxf3+ 88.Kg1 Bf2+ 89.Kf1 Bg3+ 90.Kg1 Qf2+ 91.Kh1 Qh2#
Parent - By MrKris (***) Date 2020-05-27 08:45

> but turned into a roller coaster with blunders back and forward.


Nice set-up though, every few moves you kept getting a little closer.

You mated on move 91 just a tad longer than Stockfish's 87.

[Event ""]
[Site ""]
[Date ""]
[Round ""]
[White ""]
[Black "Stockfish_20052607"]
[Result ""]
[BlackElo "2400"]
[Time "01:19:34"]
[WhiteElo "2400"]
[TimeControl "1800+3"]
[SetUp "1"]
[FEN "7k/8/4bqp1/2R5/1p1pPpP1/1P1N1Pb1/1QB4r/6K1 w - - 0 75"]
[Termination "unterminated"]
[PlyCount "0"]
[WhiteType "human"]
[BlackType "human"]

75.g5 {! but -5.78 -+}
( 75.Rb5 {M13} Bxg4 76.Rb8+ Kg7 77.fxg4 f3 78.Rb7+ Kg8 79.Rb8+ Bxb8 80.Bd1 Rxb2 81.Nxb2 d3 82.Kf2 Ba7+ 83.Kg3 f2 84.Be2 dxe2 85.e5 f1Q 86.exf6 e1Q+ 87.Kh2 Bb8+ {#})
Qg7 76.Ra5 Bc8 77.Ra8 Qd7 78.Rxc8+ Qxc8 79.Qxd4+ Kh7 80.Qa7+ Kg8 81.Qb6 Qe8 82.Qc7 Rd2 83.Kh1 Kh8 84.Kg1 Qe6 85.Qd8+ Kg7 86.Qd4+ Kh7 87.Qa7+ Kg8 88.Qa8+ Kf7 89.Qb7+ Qe7 90.Qxe7+ Kxe7 91.Nxb4 Bf2+ 92.Kf1 Kf8 93.e5 Bc5 94.Bxg6 Bxb4 95.Be4 Kf7 96.Bf5 Kg7 97.e6 Rd5 98.Be4 Rxg5 99.Bb7 Kf6 100.Ba6 Ra5 101.Bb7 Ra2 102.Bd5 Ke7 103.Bb7 Rd2 104.Bc8 Rd3 105.Kg2 Rc3 106.Ba6 
FEN: 7k/8/4bqp1/2R5/1p1pPpP1/1P1N1Pb1/1QB4r/6K1 w - - 0 75 
Stockfish_20052607: PV=12 ---------------------------------------------------------------------------
 47/23  03:08    4,647,999k  24,697k  -M11  75.Rc4 Bxc4 76.bxc4 Kh7 77.Bb1 Rxb2 78.Nxb2 d3 79.Nxd3 Qa1 80.Kg2 Qxb1 81.Nxf4 Bxf4 82.Kf2 Qa2+ 83.Kg1 Be3+ 84.Kh1 Qf2 85.c5 Qg1+
 47/25  03:08    4,647,999k  24,697k  -M12  75.Bb1 Qh4 76.Qxd4+ Kg8 77.Rc8+ Bxc8 78.Qd5+ Kg7 79.Qe5+ Kh7 80.Qc7+ Kh6 81.g5+ Qxg5 82.Qxc8 Bf2+ 83.Kf1 Qg1+ 84.Ke2 Be3+ 85.Nf2 Qxf2+ 86.Kd3 Qf1+
 47/25  03:08    4,647,999k  24,697k  -M12  75.Qa1 Qh4 76.Qxd4+ Kg8 77.Rc8+ Bxc8 78.Qd5+ Kg7 79.Qe5+ Kh7 80.Qc7+ Kh6 81.g5+ Qxg5 82.Qxc8 Bf2+ 83.Kf1 Qg1+ 84.Ke2 Be3+ 85.Nf2 Qxf2+ 86.Kd1 Qe2+
 47/25  03:08    4,647,999k  24,697k  -M12  75.Rc6 Qh4 76.Qxd4+ Kg8 77.Rc8+ Bxc8 78.Qd5+ Kg7 79.Qe5+ Kh7 80.Qc7+ Kh6 81.g5+ Qxg5 82.Qxc8 Bf2+ 83.Kf1 Qg1+ 84.Ke2 Be3+ 85.Nf2 Qxf2+ 86.Kd1 Qe2+
 47/25  03:08    4,647,999k  24,697k  -M12  75.Ne1 Qh4 76.Qxd4+ Kg8 77.Rc8+ Bxc8 78.Qd5+ Kg7 79.Qe5+ Kh7 80.Qc7+ Kh6 81.g5+ Qxg5 82.Qxc8 Bf2+ 83.Kf1 Qg1+ 84.Ke2 Qxe1+ 85.Kd3 Qf1+ 86.Kd2 Be3+
 47/25  03:08    4,647,999k  24,697k  -M12  75.Kf1 Bxg4 76.fxg4 f3 77.Rc8+ Kh7 78.Rc7+ Bxc7 79.Nf2 Bg3 80.Qa2 Rxf2+ 81.Kg1 Qh4 82.Qa7+ Kh6 83.g5+ Qxg5 84.Qh7+ Kxh7 85.e5 Qc1+ 86.Bd1 Qxd1+
 47/27  03:08    4,647,999k  24,697k  -M13  75.Rb5 Bxg4 76.Rb8+ Kg7 77.fxg4 f3 78.Rb7+ Kg8 79.Rb8+ Bxb8 80.Bd1 Rxb2 81.Nxb2 d3 82.Kf2 Ba7+ 83.Kg3 f2 84.Be2 dxe2 85.e5 f1Q 86.exf6 e1Q+ 87.Kh2 Bb8+
 47/31  03:08    4,647,999k  24,697k  -M15  75.Ne5 Bf2+ 76.Kf1 Be3 77.Qa2 Rh1+ 78.Ke2 d3+ 79.Nxd3 Bxc5 80.Qb2 Bd4 81.e5 Qd8 82.Qa2 Rh2+ 83.Kd1 Qd5 84.Kc1 Be3+ 85.Kb1 Rh1+ 86.Bd1 Rxd1+ 87.Kb2 Qd4+ 88.Kc2 Qxd3+ 89.Kb2 Qd2+
 47/31  03:08    4,647,999k  24,697k  -M15  75.Rg5 Qxg5 76.Qxd4+ Kg8 77.Qd6 Qh4 78.Qxe6+ Kg7 79.Qd7+ Kh6 80.g5+ Qxg5 81.Kf1 Qf6 82.Qc8 Qa1+ 83.Bb1 Qxb1+ 84.Nc1 Qb2 85.Qf8+ Kh5 86.Qh8+ Qxh8 87.e5 Qa8 88.e6 Qxf3+ 89.Kg1 Rh1+
 47/33  03:08    4,647,999k  24,697k  -M16  75.Ra5 Bxg4 76.fxg4 f3 77.Ra8+ Kg7 78.Ra7+ Kf8 79.Ra8+ Ke7 80.Ra7+ Kd8 81.Bd1 Rxb2 82.Ra8+ Kc7 83.Ra7+ Kb8 84.Rh7 Rd2 85.Bc2 Rxc2 86.Rd7 Rd2 87.Rb7+ Kxb7 88.Nc5+ Kc6 89.Nd3 Rd1+ 90.Ne1 Rxe1+
 47/43  03:08    4,647,999k  24,697k  -154.01  75.Rc7 Qd8 76.Ra7 Bxg4 77.fxg4 f3 78.Ra8 Qxa8 79.Qxd4+ Kh7 80.Bd1 f2+ 81.Nxf2 Bxf2+ 82.Qxf2 Rxf2 83.Kxf2 Qxe4 84.Be2 Qc2 85.Ke3 Qxb3+ 86.Ke4 Qe6+ 87.Kd3 Qxe2+ 88.Kxe2
 47/85  03:08    4,647,999k  24,697k  -5.78  75.g5 Qg7 76.Ra5 Bc8 77.Ra8 Qd7 78.Rxc8+ Qxc8 79.Qxd4+ Kh7 80.Qa7+ Kg8 81.Qb6 Qe8 82.Qc7 Rd2 83.Kh1 Kh8 84.Kg1 Qe6 85.Qd8+ Kg7 86.Qd4+ Kh7 87.Qa7+ Kg8 88.Qa8+ Kf7 89.Qb7+ Qe7 90.Qxe7+ Kxe7 91.Nxb4 Bf2+ 92.Kf1 Kf8 93.e5 Bc5 94.Bxg6 Bxb4 95.Be4 Kf7 96.Bf5 Kg7 97.e6 Rd5 98.Be4 Rxg5 99.Bb7 Kf6 100.Ba6 Ra5 101.Bb7 Ra2 102.Bd5 Ke7 103.Bb7 Rd2 104.Bc8 Rd3 105.Kg2 Rc3 106.Ba6
- By rocket (****) Date 2020-05-27 02:56
Alekhine would have been proud of this attacking game. :cool:

Curious to see how oldie Fritz handles the Queens indian on its own. So I set after 6 g3.  It contests the center with d5 right away instead of playing hypermodern, which is perfectly fine. Later grabs a pawn but I have bigger fish to fry... I saw the pattern easily.. Oldie Fritz doesn't get it.. Later spots the tactic of Ne4 but not the follow up.

[Event "120/40""]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Me"]
[Black "Fritz 2.51(Knightstalker)"]
[Result "1-0"]
Queens Indian (last book move 4. g3)

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 d5 5. Bg2 Bd6 6. O-O O-O 7. Nc3 c6 8. Bg5 dxc4 9. e4 Be7 10. a4 h6 11. Bf4 Bb7 12. Ne5 Bd6 13. h4 Bc7 14. Qe2 Qxd4 15. Rad1 Qc5 16. Ng4 Bxf4 17. Nxf6+ gxf6 18. gxf4 a6 19. e5 f5 20. Qh5 Kh7 21. Ne4 Qe7 22. Nf6+ Kg7 23. Kh2 Rh8 24. Bf3 Qxf6 25. exf6+ Kxf6 26. Bh1 Ke7 27. Rg1 Rf8 28. Rg7 Ra7 29. Qxh6 Nd7 30. Qg5+ Nf6 31. Bf3 Raa8 32. h5 Rad8 33. Rxd8 Rxd8 34. Qg6 Rf8 35. h6 c3 36. bxc3 Ne8 37. h7 Nxg7 38. Qxg7 Rc8 39. h8=Q Rxh8+ 40. Qxh8 c5 41. Bxb7 b5 42. Qh4+ Kf8 43. axb5 axb5 44. Qf6 b4 45. cxb4 cxb4 46. Bf3 Ke8 47. Bh5 Kd7 48. Bxf7 Kc6 49. Qxe6+ Kb5 50. Qc4+ Kb6 51. Bd5 b3 52. Qc6+ Ka5 53. Bc4 Kb4 54. Qb5+ Kc3 55. Qxb3+ Kd4 56. Qd3+ Kc5 57. Qd5+ Kb4 58. Qxf5 Kxc4 59. Qe5 Kd3 60. f5 Kd2 61. f6 Kd3 62. f7 Kd2 63. f8=Q Kd3 64. Qd8+ Kc2 65. Qec7+ Kb2 66. Qdb8+ Ka3 67. Qca7# 1-0
- - By rocket (****) Date 2020-05-27 03:05
If Fritz does not sac the queen, I go Rg1+, Kf8, Qxh6+!!, Rxh6. Rg8 check mate. And if Qc7... same pattern, though this time the king gets mated on e7
Parent - By MrKris (***) Date 2020-05-27 08:12
Interesting!

[Event ""]
[Site ""]
[Date ""]
[Round ""]
[White ""]
[Black "Stockfish_20052607"]
[Result ""]
[BlackElo "2400"]
[Time "00:39:27"]
[WhiteElo "2400"]
[TimeControl "1800+3"]
[SetUp "1"]
[FEN "rn5r/1b2qpk1/ppp1pN1p/4Pp1Q/P1p2P1P/5B2/1P3P1K/3R1R2 b - - 9 24"]
[Termination "unterminated"]
[PlyCount "0"]
[WhiteType "program"]
[BlackType "human"]

{M10} 24. ... Qxf6
({M9} 24. ... Kf8 25.Rg1 Qd7 26.Nxd7+ Nxd7 27.Rxd7 Rh7 28.Be4 Re8 29.Bxf5 Bc8 30.Bxh7 Bxd7 31.Qxh6+ Ke7 32.Qf6+ Kf8 33.Rg8+)
({M8} 24. ... Qc7 25.Rg1+ Kf8 26.Qxh6+ Ke7 27.Qg5 Kf8 28.Bh5 Nd7 29.Qg7+ Ke7 30.Rxd7+ Qxd7 31.Qxf7+ Kd8 32.Qxd7+)
({M7} 24. ... Qe8 25.Rg1+ Kf8 26.Rg8+ Ke7 27.Qxh6 c5 28.Rxe8+ Rxe8 29.Ng8+ Rxg8 30.Qf6+ Ke8 31.Rd8+)
({M7} 24. ... Qc5 25.Rg1+ Kf8 26.Qxh6+ Ke7 27.Qxh8 Qxf2+ 28.Rg2 Qxh4+ 29.Qxh4 c5 30.Ng8+ Ke8 31.Rd8+)
25.Rg1+ Qg6 26.Rxg6+ fxg6 27.Rg1 g5 28.hxg5 Kf8 29.gxh6 Ke7 30.Rd1 Rxh6 31.Qxh6 Nd7 32.Qg7+ Ke8 33.Bh5+ Kd8 34.Qxd7+
FEN: rn5r/1b2qpk1/ppp1pN1p/4Pp1Q/P1p2P1P/5B2/1P3P1K/3R1R2 b - - 9 24 
Stockfish_20052607: PV=12 ---------------------------------------------------------------------------
 95/7  01:28    2,953,639k  33,568k  -M3  24. ... c3 25.Rg1+ Kf8 26.Qxh6+ Rxh6 27.Rg8+
 95/7  01:28    2,953,639k  33,568k  -M3  24. ... a5 25.Rg1+ Kf8 26.Qxh6+ Rxh6 27.Rg8+
 95/9  01:28    2,953,639k  33,568k  -M4  24. ... Qb4 25.Rg1+ Kf8 26.Qxh6+ Ke7 27.Qxh8 Nd7 28.Rxd7+
 95/9  01:28    2,953,639k  33,568k  -M4  24. ... Qd6 25.Rg1+ Kf8 26.Qxh6+ Rxh6 27.Rg8+ Ke7 28.Re8+
 95/9  01:28    2,953,639k  33,568k  -M4  24. ... Qa3 25.Rg1+ Kf8 26.Qxh6+ Rxh6 27.Rg8+ Ke7 28.Re8+
 95/11  01:28    2,953,639k  33,568k  -M5  24. ... Qd8 25.Rg1+ Kf8 26.Rxd8+ Ke7 27.Rg7 Kxd8 28.Qxf7 c3 29.Qc7+
 95/13  01:28    2,953,639k  33,568k  -M6  24. ... Qd7 25.Nxd7 Rh7 26.Nf6 Nd7 27.Rxd7 Kh8 28.Rxf7 Rxf7 29.Qxh6+ Rh7 30.Qxh7+
 95/15  01:28    2,953,639k  33,568k  -M7  24. ... Qc5 25.Rg1+ Kf8 26.Qxh6+ Ke7 27.Qxh8 Qxf2+ 28.Rg2 Qxh4+ 29.Qxh4 c5 30.Ng8+ Ke8 31.Rd8+
 95/15  01:28    2,953,639k  33,568k  -M7  24. ... Qe8 25.Rg1+ Kf8 26.Rg8+ Ke7 27.Qxh6 c5 28.Rxe8+ Rxe8 29.Ng8+ Rxg8 30.Qf6+ Ke8 31.Rd8+
 95/17  01:28    2,953,639k  33,568k  -M8  24. ... Qc7 25.Rg1+ Kf8 26.Qxh6+ Ke7 27.Qg5 Kf8 28.Bh5 Nd7 29.Qg7+ Ke7 30.Rxd7+ Qxd7 31.Qxf7+ Kd8 32.Qxd7+
 95/19  01:28    2,953,639k  33,568k  -M9  24. ... Kf8 25.Rg1 Qd7 26.Nxd7+ Nxd7 27.Rxd7 Rh7 28.Be4 Re8 29.Bxf5 Bc8 30.Bxh7 Bxd7 31.Qxh6+ Ke7 32.Qf6+ Kf8 33.Rg8+
 95/21  01:28    2,953,639k  33,568k  -M10  24. ... Qxf6 25.Rg1+ Qg6 26.Rxg6+ fxg6 27.Rg1 g5 28.hxg5 Kf8 29.gxh6 Ke7 30.Rd1 Rxh6 31.Qxh6 Nd7 32.Qg7+ Ke8 33.Bh5+ Kd8 34.Qxd7+
- - By rocket (****) Date 2020-05-27 18:23
Btw, how powerful is my Macbook air for running a single core chess program? Is it in the medium range?

Processor: 1.7 GHz INTEL Core i5

4GB MEMORY, 1600 MHz DDR3
Parent - - By MrKris (***) Date 2020-05-28 22:04

> Is it in the medium range?


Yes, definitely! (Even if I am 'carried away' I do not think anyone would call it 'bad'.)

Based on https://www.rebel.nl/reb-wely.htm :
----
"From February 19 till February 22, 2002 REBEL played a 4 game match against GM Loek van Wely who has an elo rating of 2714!
The end-result 2-2, a fantastic result for REBEL.
The time control for the event was tournament time control 40 moves in 2 hours, 20 moves in 1 hour and thereafter Fischer 30 seconds for the rest of the game.
Location of the event: Centre Céramique, Avenue Céramique 50, Maastricht, The Netherlands.
Specifics:
    GM Loek van Wely versus REBEL.
    February 19-22, 2002.
    Time control: 40/120, 20/60, Fischer 30 seconds.
    Location: Maastricht, the Netherlands.
    Organization: Chess Events Maastricht Foundation.
    Organization director: Jan van Reek.
    Tournament director: International arbiter Geurt Gijssen.
    Game comments: Jan van Reek.
    Internet support: Daan Brorens.
Hard and Software:
    Chess Program: Rebel Century 4.0
    Special settings: using anti-GM modus and the 55 million EOC opening repertoire.
    Athlon 1900+ Mhz, 512 Mb.
"
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The specs are incorrect: it was an AMD model name Athlon XP 1900+, 1.6 GHz speed 32-bit processor*, the word for 1-core back then before any 'cores' .
The "XP" in the name stressing that it was Windows XP -major OS upgrade then- compatible ('XP' in model names was annoying back then, I even found an 'XP' keyboard on the web awhile ago).
The "1900+" in the model name stressing AMD's claim it was almost 2x faster than a previous IGHz Intel.**

So very roughly with your 1.7 GHz, similar speed but more modern CPU, RAM etc.:
= 2 to 3 times faster than the above that was 2-2 vs. a GM @ 40/2 hrs.

 
 
* See complete specs http://www.cpu-world.com/CPUs/K7/AMD-Athlon%20XP%201900+%20-%20AX1900DMT3C.html .

** See "AMD's Athlon XP 1900+ (1.6GHz): Still #1" November 5, 2001"
https://www.anandtech.com/show/846
CPU's where getting somewhat 'modern' back then so I am guessing at 2 to 3 times faster, I would say at least 2 though even if you are running a 32-bit engine.

Note 32-bit vs. 64-bit: https://www.quora.com/Would-a-64-bit-chess-playing-program-perform-better-than-a-32-bit-one
"Marcin Kasperski, Software Developer
Answered Feb 22, 2012
Quite a few chess engines are available in both 32- and 64-bit versions, and their performance can be compared, so no guessing is needed. AFAIR 1.* and 2.* 64-bit Rybka was 50-60% faster than 32-bit. The reasons are already described in Caro Kann answer above. Whether and how much is gained of course depends on the engine code."
Up Topic The Rybka Lounge / Computer Chess / Fritz 2 vs Fritz 2 (1992) masterpiece
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