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Up Topic The Rybka Lounge / Test Positions / Anything other than 36.Bd3?
- By Peter Grayson (****) [gb] Date 2017-09-26 00:37
I've taken this position from Hurnavich's tournament here

http://rybkaforum.net/cgi-bin/rybkaforum/post_add.pl?pid=574938

In Game 6, Stockfish played 36.g4 with Komodo 11.2.2 immediately scoring in its favour and Komodo went on to win fairly quickly from here. 36.Bd3 heads toward the 3-fold repetition. Was there anything better? It may well be that in this case trying to avoid the draw was a mistake.

4r3/2r2pkp/p2p2p1/1p1P4/nP1bP2P/R1p2KP1/P1Q1BP2/8 w - - 0 36


It is probaby more accurate to take the game as a whole to reproduce the moves leading up to this position in the game.

[Event "Komodo 11.2.2 LTC vs StockFish 110817 F"]
[Site "Hert 500 Suite"]
[Date "2017.08.19"]
[Round "6"]
[White "StockFish 110817 FDEV"]
[Black "Komodo 11.2.2 64-bit LTC"]
[Result "0-1"]
[ECO "B32"]
[Annotator "0.31;0.32"]
[PlyCount "94"]
[EventDate "2017.??.??"]
[TimeControl "300+2"]

{AMD Phenom(tm) II X6 1100T Processor 3625 MHz W=27.3 plies; 9,085kN/s; 222,
386 TBAs B=26.5 plies; 7,671kN/s; 748,520 TBAs} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4
4. Nxd4 e5 5. Nb5 d6 6. c4 {Both last book move} Be7 {[%eval 32,26] [%emt 0:00:
23]} 7. N5c3 {[%eval 31,27] [%emt 0:00:17]} Nf6 {[%eval 30,25] [%emt 0:00:14]}
8. Be2 {[%eval 29,23] [%emt 0:00:01]} Nd4 {[%eval 35,25] [%emt 0:00:13]} 9. O-O
{[%eval 30,25] [%emt 0:00:09]} a6 {[%eval 38,24] [%emt 0:00:15] (Nxe2+)} 10.
Bd3 {[%eval 30,26] [%emt 0:00:14] (Be3)} O-O {[%eval 26,22] [%emt 0:00:09]} 11.
Be3 {[%eval 35,25] [%emt 0:00:08] (Nd2)} Be6 {[%eval 28,23] [%emt 0:00:11] (b5)
} 12. Nd5 {[%eval 36,23] [%emt 0:00:10] (Nd2)} Bxd5 {[%eval 21,25] [%emt 0:00:
19]} 13. cxd5 {[%eval 25,26] [%emt 0:00:10]} Nd7 {[%eval 16,24] [%emt 0:00:07]}
14. Nc3 {[%eval 30,26] [%emt 0:00:08]} Rc8 {[%eval 22,24] [%emt 0:00:08] (Nc5)}
15. Rc1 {[%eval 31,22] [%emt 0:00:01]} Qa5 {[%eval 24,25] [%emt 0:00:11]} 16.
Qg4 {[%eval 32,25] [%emt 0:00:12] (a3)} Rfd8 {[%eval 9,23] [%emt 0:00:15] (Qd8)
} 17. Rb1 {[%eval 40,24] [%emt 0:00:05] (a3)} Bf6 {[%eval 13,24] [%emt 0:00:08]
(Qb4)} 18. Rfc1 {[%eval 39,28] [%emt 0:00:19]} b5 {[%eval 22,26] [%emt 0:00:13]
(Rc7)} 19. Qd1 {[%eval 80,27] [%emt 0:00:08]} Nb6 {[%eval 23,25] [%emt 0:00:05]
(Re8)} 20. b4 {[%eval 77,31] [%emt 0:00:34] (a4)} Qa3 {[%eval 26,26] [%emt 0:
00:05]} 21. Bxd4 {[%eval 57,33] [%emt 0:00:17]} exd4 {[%eval 20,26] [%emt 0:00:
04]} 22. Rb3 {[%eval 40,25] [%emt 0:00:01]} Qxc1 {[%eval 15,25] [%emt 0:00:03]}
23. Qxc1 {[%eval 56,28] [%emt 0:00:05]} dxc3 {[%eval 25,26] [%emt 0:00:05]} 24.
h3 {[%eval 49,29] [%emt 0:00:11] (Ra3)} Na4 {[%eval 0,27] [%emt 0:00:03] (Rc7)}
25. Qc2 {[%eval 57,29] [%emt 0:00:10]} g6 {[%eval 11,27] [%emt 0:00:13] (Nb2)}
26. Ra3 {[%eval 32,29] [%emt 0:00:18] (g3)} Rc7 {[%eval 5,26] [%emt 0:00:12]
(Nb2)} 27. g3 {[%eval 51,26] [%emt 0:00:04] (Rxa4)} Nb2 {[%eval 0,32] [%emt 0:
00:06] (Ra8)} 28. Bf1 {[%eval 50,29] [%emt 0:00:06]} Na4 {[%eval 0,31] [%emt 0:
00:03]} 29. Bd3 {[%eval 50,29] [%emt 0:00:11] (Be2)} Nb2 {[%eval 0,34] [%emt 0:
00:04]} 30. Bf1 {[%eval 45,34] [%emt 0:00:07] (Be2)} Na4 {[%eval 0,28] [%emt 0:
00:03]} 31. Kg2 {[%eval 27,25] [%emt 0:00:02]} Re8 {[%eval 0,30] [%emt 0:00:03]
} 32. Kf3 {[%eval 35,29] [%emt 0:00:05]} Kg7 {[%eval 0,34] [%emt 0:00:10] (Ra8)
} 33. h4 {[%eval 41,28] [%emt 0:00:18]} Bd4 {[%eval 0,28] [%emt 0:00:04] (Ra8)}
34. Bd3 {[%eval 32,27] [%emt 0:00:10]} Nb2 {[%eval 0,29] [%emt 0:00:06]} 35.
Be2 {[%eval 0,28] [%emt 0:00:10]} Na4 {[%eval 0,32] [%emt 0:00:13]} 36. g4 {
[%eval 0,29] [%emt 0:00:06] (Bd3)} h6 {[%eval -41,25] [%emt 0:00:14] (f5)} 37.
Bd3 {[%eval 0,26] [%emt 0:00:05] (Rb3)} Nb2 {[%eval -121,26] [%emt 0:00:05]
(Bf6)} 38. Bf1 {[%eval -85,30] [%emt 0:00:24] (Be2)} Nc4 {[%eval -147,24]
[%emt 0:00:03]} 39. Bxc4 {[%eval -67,28] [%emt 0:00:02]} Rxc4 {[%eval -186,25]
[%emt 0:00:04]} 40. Kg2 {[%eval -90,25] [%emt 0:00:01]} Bf6 {[%eval -192,26]
[%emt 0:00:05] (Rxe4)} 41. g5 {[%eval -203,28] [%emt 0:00:12] (f3)} hxg5 {
[%eval -309,23] [%emt 0:00:03]} 42. hxg5 {[%eval -219,29] [%emt 0:00:05]} Be5 {
[%eval -290,24] [%emt 0:00:03]} 43. Qc1 {[%eval -221,30] [%emt 0:00:06] (f4)}
c2 {[%eval -412,27] [%emt 0:00:04] (Rxe4)} 44. Rb3 {[%eval -643,31] [%emt 0:00:
20] (Rxa6)} Rec8 {[%eval -693,26] [%emt 0:00:03]} 45. Re3 {[%eval -662,29]
[%emt 0:00:04]} Rxb4 {[%eval -755,29] [%emt 0:00:03]} 46. Re2 {[%eval -681,23]
[%emt 0:00:00] (Re1)} Rb2 {[%eval -810,28] [%emt 0:00:07] (Bf4)} 47. f4 {
[%eval -725,27] [%emt 0:00:05]} Rb1 {[%eval -929,27] [%emt 0:00:06]} 0-1
- - By Hurnavich (Bronze) Date 2017-09-26 09:30 Edited 2017-09-26 09:48
Interesting here Houdini 6 contempt 0 locked on 36.g4 gives this evaluation of the position +0.00

4r3/2r2pkp/p2p2p1/1p1P4/nP1bP2P/R1p2KP1/P1Q1BP2/8 w - - 0 36


36. g4 Re5 37. Rxa4 bxa4 38. Bd3 f5 39. exf5 gxf5 40. Bxf5 h5 41. Qc1 hxg4+
42. Kxg4 Kg8 43. Be6+ Kg7 44. Bf5 {(0:02:58) 1827209kN}{[%eval 0,34,Houdini 6
C=0][%meval 178s|TB:183k]} *

And here is something it likes


36. Rb3 Nb2 37. Kg2 Re5 38. Kh3 h5 39. f3 Re8 40. Ra3 Na4 41. Bd3 Nb2 42. Bf1
Na4 43. Be2 Rec8 44. Rb3 Nb2 45. Kh2 Re8 46. Ra3 Na4 47. Bd3 Rec8 48. Bf1 Re8
49. Be2 Rec8 {(0:01:37) 1001247kN}{[%eval 19,29,Houdini 6 C=0][%meval
97s|TB:6k]} *

Is the move 36.Rxa4 of any Merritt?

36. Rxa4 bxa4 37. a3 a5 38. b5 Rec8 39. Bd3 Bb6 40. Ke2 h6 41. Kd1 h5 42. Ke2
Kf8 43. Kd1 Ke7 44. f3 Bd4 45. Ke2 Ba7 46. Kd1 Bb6 47. Ke2 Kf8 48. Kd1 Be3 49.
Ke2 Bd4 50. Kd1 Bb6 51. Kc1 Re7 52. Kd1 Kg7 53. Ke2 Rec7 54. Kd1 Rc5 55. Kc1
{(0:02:24) 1119597kN}{[%eval -22,38,Komodo 11.2.2 LTC][%meval 144s|TB:93k]} *
Parent - - By Stonehenge (***) Date 2017-09-27 10:47
Houdini 6 suggests that 36.g4 h6 is actually OK for White, the real mistake is 37.Bd3? instead of 37.Rb3!

Analysis after 36...h6:
36/83  03:19,076   17 351 697k  87 161k   0,00  37.Rb3 Bf6 38.h5 gxh5 39.gxh5 Re5 40.Kg3 Rce7 41.Bf3 Rc7 42.Be2
37/83  04:22,721   22 882 534k  87 098k   0,00  37.Rb3 Bf6 38.h5 gxh5 39.gxh5 Nb6 40.Ra3 Nc4 41.Rxa6 Nd2+ 42.Kg2 Rxe4 43.Rc6 Rce7 44.Bf3 Rc4 45.a4 Re1 46.axb5 Rh4 47.Rc7 Kg8 48.Qf5 Rhh1 49.Qc8+ Kg7 50.Qg4+ Bg5 51.Qd4+ Bf6 52.Qg4+

Analysis after 37.Bd3:
27/66  00:51,408    5 140 765k   99 999k  +1,74  37. ... Nb2 38.Be2 Nc4 39.Bxc4 Rxc4 40.Rb3 Bf6 41.g5 hxg5 42.hxg5 Be5 43.Rb1 Rh8 44.a3 Rh4 45.Rd1 Rf4+ 46.Ke3 Rg4 47.Kf3 Rxg5 48.Re1 Rh5 49.Kg2 Rh2+ 50.Kg1 Rc8 51.Rd1 Rh4 52.Kg2 Rch8 53.Rd3 Rh1 54.Rd1 R8h2+
28/68  01:10,381    7 016 770k   99 696k  +1,84  37. ... Nb2 38.Bf1 Nc4 39.Bxc4 Rxc4 40.Rb3 Bf6 41.g5 hxg5 42.hxg5 Be5 43.a3 Rh8 44.Rb1 Rh4 45.Rd1 Rf4+ 46.Ke3 Rg4 47.Kf3 Rxg5 48.Re1 Rh5 49.Kg2 Rh2+ 50.Kg1 Rc8 51.Rd1 Rh4 52.Kg2 Rch8 53.Rf1 Rf4 54.a4 bxa4 55.Qxa4 Rxe4
29/78  02:08,346   12 797 951k   99 714k  +2,31  37. ... Nb2 38.Be2 Nc4 39.Bxc4 Rxc4 40.Kg2 Bf6 41.f3 Rec8 42.f4 Rxb4 43.Rb3 Rxe4 44.g5 Re2+ 45.Qxe2 c2 46.gxf6+ Kxf6 47.Qe3 c1Q 48.Qxc1 Rxc1 49.Ra3 Rd1 50.Rxa6 Rxd5 51.Kf3 Kf5 52.Ra7 f6 53.Ke3 Rc5 54.Rd7 Rc3+ 55.Kd4 Rc4+ 56.Kd5 Rxf4 57.Rb7 b4 58.Kxd6 Kg4

37.Bd3?? really appears to be a bad blunder.
Parent - - By Peter Grayson (****) [gb] Date 2017-09-27 23:28
It is unclear if the pawn advance 36.g4 is tenable. After the ensuing exchange
36. g4 h6 37. Rb3 Bf6 38. h5 gxh5 39. gxh5
4r3/2r2pk1/p2p1b1p/1p1P3P/nP2P3/1Rp2K2/P1Q1BP2/8 b - - 0 39


leaving an unsupported pawn on h5 seems to add to White's weaknesses that are the e4 pawn and Black's c3 pawn that is tying down White's Queen. The Queen is stuck blocking the pawn because Black's Knight returning to b2 prevents White's Bd1 or Bd3 manoevre to release the Queen. Komodo 11.2.2 diverts the pressure from the e4 pawn and looks to gain control of the open G file with 39...Rg8 with perhaps the idea of Rg5 placing pressure on the h5 pawn and also threatening the possibility of doubling the rooks  It is assumed White played Rb3 to support the h5 pawn when it certainly looks that Black has the more dynamic position. Does White use its King to support h5?

White is already in something of a static when perhaps 36.Bd3 taking the 3 fold repetition (Komodo would play it) looks the safest approach.

So in the given continuation Komodo would play ...

39...Rg8 40.Kg2 Kh8+ 41.Kh3 Be5 42.Rb1 Rg5 43.Rf1 Bf4 44.Rd1 Kg7 45.Bg4 Kg8 46.Be2 Kf8 47.a3 Kg8 48.Rd3 Be5 49.Rd1 Nb6 50.Rf1 Bf4 51.Ra1 Kf8 52.Bg4 Rc4 53.Be2 Rc8 54.Ra2 Na4 55.Ra1 Ke7 56.Bg4 Rc4 57.Rd1 Nb2 58.Rf1 Rd4 59.Be2 Na4 60.Rd1
  =/+  (-0.51)   Depth: 40   00:06:35  9928MN, tb=264526
39...Rg8 40.Kg2 Kh8+ 41.Kh3 Be5 42.Rb1 Rg5 43.Rf1 Bf4 44.Rd1 Kg7 45.Bg4 Kg8 46.Be2 Kf8 47.a3 Kg8 48.Rd3 Be5 49.Rd1 Nb6 50.Rd3 Kf8 51.Bg4 Na4 52.f3 Rc4 53.Rd1 Kg8 54.Rd3 Bf4 55.Rd1 Kg7 56.Rd3 Rc7 57.Rd1 Kf8 58.Rf1 Rc4 59.Rd1 Nb6 60.Rd3 f5 61.exf5
  =/+  (-0.52)   Depth: 41   00:08:20  11602MN, tb=318241

Certainly an interesting continuation where Komodo seems to assess the dynamics of Black's position as better than White. Houdini 6.01's score goes negative for White after Black's 39..Rg8
Parent - By Stonehenge (***) Date 2017-09-29 00:08
After 39...Rg8 I get the following analysis with Houdini 6:

[D]
6r1/2r2pk1/p2p1b1p/1p1P3P/nP2P3/1Rp2K2/P1Q1BP2/8 w - - 1 40


39/86   43:16,676    67 893 749k   26 146k   -0,10   40.Kg2 Kf8+ 41.Kh1 Be5 42.Rb1 Nb6 43.Rg1 Rg5 44.Bd1 Nd7 45.a4 Rc4 46.f4 Rxg1+ 47.Kxg1 Bxf4 48.axb5 axb5 49.Be2 Rxb4 50.Qxc3 Rxe4 51.Kf1 Ne5 52.Bxb5 Be3 53.Qc8+ Kg7 54.Qh3 Rf4+ 55.Ke1 Rf3 56.Qg2+ Bg5 57.Qb2 Rh3 58.Be2 Be3 59.Kd1 Bc5 60.Kd2 Re3 61.Kd1 Rg3 62.Kc2 Ra3 63.Kd1 Re3 64.Bb5 Re4 65.Qg2+ Rg4 66.Qh3 Rg1+ 67.Kc2

After I force 40.Kg2 Kh8+ 41.Kh1 Be5 42.Rb1 Nb6 (to follow Komodo's line) I get this:

39/73   02:36,998   4 329 319k   27 575k    0,00   43.Rg1 Rxg1+ 44.Kxg1 Nc4 45.Bd3 Nd2 46.Qd1 Rc8 47.Kg2 Rg8+ 48.Kh3 Kh7 49.Qe2 Rg1 50.Qe3 Rh1+ 51.Kg4 Nc4 52.Qe2 Rg1+ 53.Kh3 Nd2

Houdini 6 is not impressed :).
Up Topic The Rybka Lounge / Test Positions / Anything other than 36.Bd3?

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