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Up Topic The Rybka Lounge / Computer Chess / Fritz 2 vs Fritz 2 (1992) masterpiece
- - 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
- - 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
[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>
Up Topic The Rybka Lounge / Computer Chess / Fritz 2 vs Fritz 2 (1992) masterpiece

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