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Could Gaviota have won against Shredder, in TCEC?
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Julien MARCEL



Joined: 05 May 2008
Posts: 2883
Location: Nantes (France)

PostPost subject: Could Gaviota have won against Shredder, in TCEC?    Posted: Mon Feb 18, 2013 3:34 pm Reply to topic Reply with quote

Gaviota just qualified splendidly by drawing Shredder in TCEC. But many observers wonder if Gaviota could actually have won the game, with a handset of more accurate moves. A typical example occurred in this position:

[d]8/6k1/3q1pn1/8/2p2PPp/2pr4/P5RK/2Q2R2 b - - 3 50
   ::    ::    ::    ::
::    ::    ::    BK    
   ::    BQ    BP BN ::
::    ::    ::    ::    
   :: BP ::    WP WP BP
::    BP BR ::    ::    
WP ::    ::    :: WR WK
::    WQ    :: WR ::    

Shredder, with white, just played Qc1, and Gaviota will answer with the much debated Kh7 move. Could this be improved?

StockFish has Kh7 at -0.96 (so still a good position for black), but this is only its... 15th choice (!!!), far from it's #1 choice: Kf7 (-4.08):

Code:

Stockfish  130131 64bit:
-4.08/26 50...Kf7 51.Rgf2 Qd7 52.Rg2 Qd4 53.g5 Rd2 54.Qb1 Rxg2+ 55.Kxg2 Nxf4+ 56.Rxf4 Qxf4 57.Qh7+ Ke6 58.Qg8+ Ke7 59.Qg7+ Kd6 60.Qf8+ Kd5 61.Qf7+ Kd6
-3.87/26 50...Qd4 51.g5 fxg5 52.Rxg5 Rd2+ 53.Rg2 h3 54.Kxh3 Kf7 55.Rxd2 cxd2 56.Qb1 Kf6 57.Kh2 Qe3 58.Qd1 c3 59.Qa4 Qd3 60.Qc6+ Kf7 61.Qb7+ Ne7 62.Qb3+ Kf6 63.Qb6+ Kf5 64.Qc5+ Nd5 65.Qc8+ Ke4 66.Qe8+ Kd4 67.Qh8+
-2.30/26 50...h3 51.Rgf2 Qd4 52.Qe1 Rd2 53.Kxh3 Qd3+ 54.Kh2 Kf7 55.Rg2 Qd4 56.g5 Nxf4 57.g6+ Nxg6 58.Qg3 Qh4+ 59.Qh3 Rxg2+ 60.Kxg2 Nf4+ 61.Rxf4 Qxf4 62.Qxc3 Qc7 63.Kf3 f5 64.Ke3 Qb6+ 65.Kf4 Qd6+ 66.Ke3 Qc5+
-2.30/26 50...Qd7 51.Qe1 h3 52.Rc2 Qd4 53.Rcf2 Rd2 54.Kxh3 Qd3+ 55.Kh2 Kf7 56.Rg2 Qd5 57.Rff2 Nh4 58.Rg3 Nf3+
-2.30/26 50...Qd8 51.Qe1 h3 52.Rc2 Qd4 53.Rcf2 Rd2 54.Kxh3 Qd3+
-2.18/26 50...Ne7 51.Qb1 Qd7 52.g5 Qh3+ 53.Kg1 Qe3+ 54.Rgf2 h3 55.Qb5 Rd2 56.gxf6+ Kxf6 57.Qe5+ Qxe5 58.fxe5+ Ke6 59.Re1 Nd5 60.a3 Rd3 61.Rfe2 Nf4 62.Rc2 Rg3+ 63.Kh1 Nd3 64.Rg1 Re3 65.Kh2 Ne1 66.Rxe1 Rxe1 67.Rxc3
-1.93/26 50...Rd2 51.Qxc3 Rd4 52.Kh1 Nxf4 53.Rgf2 Qd5+ 54.Qf3 c3 55.Qxd5 Nxd5 56.Ra1 Ne3 57.Re2 Rd3 58.Rc1 Kg6 59.a4 c2 60.Rexc2 Nxc2 61.Rxc2 Kg5 62.a5
-1.69/26 50...Qe6 51.a4 Qd5 52.a5 h3 53.Rgf2 Qxa5 54.Qb1 Qa7 55.Qb4 Qc7 56.Qb5 Rd2 57.Kxh3 Rxf2 58.Rxf2 Nxf4+ 59.Kh4 Nd3 60.Re2 Ne5 61.Kh3 Nf3 62.Qb1 Nd4 63.Re8 Qf7 64.Re3
-1.49/26 50...Qd5 51.Qe1 h3 52.Rgf2 Qd6 53.Qe4 Rd2 54.Kh1 c2 55.Qb7+ Kh6 56.g5+ fxg5 57.fxg5+ Kxg5 58.Rg1+ Kh6 59.Qf3 Rxf2 60.Qxf2 Qd5+ 61.Kh2 Qe5+ 62.Kh1 Qe4+ 63.Kh2 Kh5 64.Qe1 Qf4+ 65.Kxh3 Qf5+ 66.Kg3 Ne5 67.Qe2+ Kg6 68.Rf1
-1.49/26 50...Qb6 51.Qe1 h3 52.Rgf2 Qd6 53.Qe4 Rd2 54.Kh1 c2 55.Qb7+ Kh6 56.g5+ fxg5 57.fxg5+ Kxg5 58.Rg1+ Kh6 59.Qf3 Rxf2 60.Qxf2 Qd5+ 61.Kh2 Qe5+ 62.Kh1 Qe4+ 63.Kh2 Kh5 64.Qe1 Qf4+ 65.Kxh3 Qf5+ 66.Kg3 Ne5 67.Qe2+ Kg6 68.Rf1
-1.49/26 50...Qc6 51.Qe1 h3 52.Rc2 Qd5 53.Rcf2 Qd6 54.Qe4 Rd2 55.Kh1 c2 56.Qb7+ Kh6 57.g5+ fxg5 58.fxg5+ Kxg5 59.Rg1+ Kh6 60.Qf3 Rxf2 61.Qxf2 Qd5+ 62.Kh2 Qe5+ 63.Kh1 Qe4+ 64.Kh2 Kh5 65.Qe1 Qf4+ 66.Kxh3 Qf5+ 67.Kg3 Ne5 68.Qe2+ Kg6 69.Rf1
-1.09/26 50...Rd4 51.Rgf2 Kh7 52.Qe3 Rd2 53.a4 Nxf4 54.Kh1 Rxf2 55.Rxf2 Nd3 56.Rc2 Kg7 57.a5 Qd5+ 58.Kh2 Ne5 59.Qxc3 Nf3+ 60.Kh3 Ng5+ 61.Kh2 Qd1 62.Kg2 Ne4 63.Qb2
-1.05/26 50...Kf8 51.a4 h3 52.Rgf2 Ne7 53.Qe1 Nd5 54.Qe4 Ne3 55.Rg1 c2 56.Re2 c3 57.Kh1 Qd7 58.a5 c1=Q 59.Rxc1 Rd1+ 60.Re1 Rxc1 61.Rxc1 Nxg4 62.Qa8+ Kf7 63.Rg1 h2 64.Rc1 Qd2 65.Qb7+ Kg6 66.Qe4+ Kh6 67.Qc2 Qxf4 68.a6 Qf3+
-1.05/26 50...Qe7 51.g5 f5 52.Qb1 h3 53.Rgf2 Qe3 54.Qb7+ Ne7 55.Qc7 Rd2 56.Rxd2 cxd2 57.Qxc4 d1=R 58.Rxd1 Qf2+ 59.Kxh3 Qf3+ 60.Kh2 Qxd1 61.Qc3+ Kf7 62.Qe5 Qc2+ 63.Kg3 Qd3+ 64.Kf2 Qa6 65.Ke1 Qa7 66.Kd1 Qa6
-0.96/26 50...Kh7 51.a4 Rd4 52.Rgf2 Rd2 53.Qxc3 Qxf4+ 54.Kg1 Qxg4+ 55.Kh1 Rd3 56.Qe1 Rg3 57.Rh2 c3 58.Rxf6 Kg7 59.Rff2 Qxa4 60.Rhg2 Qc6 61.Kg1 Qd6 62.Rxg3
-0.80/26 50...Qb4 51.g5 f5 52.Re2 Qd6 53.a4 Qd4 54.Rff2 Kf7 55.a5 Qd5 56.Qf1 Qxa5 57.Ra2 Qc7 58.Qa1 Qc5 59.Rae2 Qc6 60.Ra2 Qd6 61.Qb1 Ne7 62.Qe1
-0.60/26 50...Kg8 51.a4 Qd5 52.Qb1 Kf7 53.Rgf2 Qe6 54.Qb7+ Ne7 55.Qb5 Kg7 56.Qb7 Kf8 57.Qb8+ Kf7 58.Qb5 Kg7 59.Qb7 Kf8 60.Qb8+ Kf7 61.Qb5
-0.40/26 50...Kh8 51.a4 Qc5 52.Qe1 h3 53.Re2 Kg7 54.Qf2 Qc7 55.Kg1 Qa5 56.Kh2 Kh7 57.Kg1 Qc7 58.Re4
-0.36/26 50...Qc7 51.g5 fxg5 52.Rxg5 Qd7 53.Qe1 Kf6 54.Qe4 Rd2+ 55.Rg2 Qd3 56.Qxd3 Rxd3 57.a4 Ne7 58.Rc1 Nd5 59.a5 Rd2 60.a6 h3 61.Kxh3 Nxf4+ 62.Kg3 Nxg2 63.Rxc3 Ra2 64.Rxc4 Ne3 65.Rc6+ Ke5
-0.52/26 50...Qc5 51.g5 f5 52.a4 Qb4 53.Ra2 Qd6 54.Raf2 Ne7 55.Re1 Nd5 56.Re8 Rd4 57.Kg1 Rxf4 58.Rxf4


Here's the whole game:


[Event "nTCEC - Stage 1 - Season 1"]
[Site "http://www.tcec-chess.net"]
[Date "2013.02.18"]
[Round "7.8"]
[White "Shredder 12.0"]
[Black "Gaviota 0.86b3"]
[Result "1/2-1/2"]
[Variant "normal"]

1. d4 d6 2. Nf3 g6 3. g3 Bg7 4. Bg2 Nd7 5. O-O e5 6. c4 Ne7 7. Nc3 O-O 8. e4
exd4 9. Nxd4 Re8 10. b3 Nc6 11. Be3 Nde5 12. Rc1 Ng4 13. Nxc6 bxc6 14. Bd2 Ne5
15. Be3 Ng4 16. Bd2 Ne5 17. Na4 g5 18. h3 Rb8 19. Be3 c5 20. Nc3 g4 21. hxg4
Bxg4 22. f3 Be6 23. Qc2 h5 24. Kh1 h4 25. g4 Ng6 26. Qd2 a5 27. Kh2 Rb4 28. Kh3
Qd7 29. Qd1 a4 30. Nxa4 Ra8 31. Rf2 Raxa4 32. bxa4 Rxa4 33. Rb1 Bxc4 34. Bf1
Bxf1+ 35. Rxf1 Bd4 36. Bxd4 Rxd4 37. Qc1 Kg7 38. Qg5 d5 39. Rf2 c4 40. Re1 c3
41. Kg2 Qe6 42. Kh1 Qe5 43. Qc1 Rd3 44. exd5 Qxd5 45. Ref1 f6 46. Kh2 c5 47. f4
Qd7 48. Rg2 c4 49. Qe1 Qd6 50. Qc1 Kh7 51. a4 Rd4 52. Rgf2 Rd2 53. Qxc3 Qxf4+
54. Kg1 Qxg4+ 55. Kh1 Rd3 56. Qe1 f5 57. Rh2 Qd4 58. Qf2 Qf6 59. Rg1 f4 60. Qc5
c3 61. a5 Kh6 62. a6 Qd8 63. Qc6 Rg3 64. Rc1 Qe7 65. Ra1 Re3 66. Rg2 Rh3+
67. Rh2 1/2-1/2


There were other inaccuracies later, that drove this game to a draw, so I'll try an auto play with Stockfish starting with 50. ..., Kf7, and see if it leads to a black victory.
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Display posts from previous:   
Subject Author Date/Time
Could Gaviota have won against Shredder, in TCEC? Julien MARCEL Mon Feb 18, 2013 3:34 pm
      Re: Could Gaviota have won against Shredder, in TCEC? Michael Golub Mon Feb 18, 2013 10:05 pm
            Re: Could Gaviota have won against Shredder, in TCEC? Julien MARCEL Tue Feb 19, 2013 6:27 pm
                  Re: Could Gaviota have won against Shredder, in TCEC? Lucas Braesch Wed Feb 20, 2013 12:00 pm
                        Re: Could Gaviota have won against Shredder, in TCEC? Julien MARCEL Wed Feb 20, 2013 1:25 pm
                              Re: Could Gaviota have won against Shredder, in TCEC? Lucas Braesch Wed Feb 20, 2013 2:10 pm
                                    Re: Could Gaviota have won against Shredder, in TCEC? Julien MARCEL Fri Mar 01, 2013 4:10 pm
                                          Re: Could Gaviota have won against Shredder, in TCEC? Adam Hair Fri Mar 01, 2013 4:46 pm
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