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Up Topic The Rybka Lounge / Computer Chess / 5, 10, 20%? of TCEC SuFi draws from SF OCB blindness?
- By MrKris (***) Date 2021-01-20 08:19
Stockfish, thanks to the TCEC hardware saw the opposite colored bishops, OCB, comming far before it was played.

Of course, it is difficult to say if there was anything that would have won vs. Lc0 even if Stockfish knew enough about OCB's to avoid the drawn R+opB ending here.

From TCEC chat:
ddarthez
: SF probably trying to discover if one can literally burn time
2-Month Subscriber (2-Month Badge)usernametakenefkay
: Cmon fish take the draw
14-Month Subscriber (1-Year Badge)xchristianmccx
: So does the real moral victory go to the engine that wasted less of everyone’s time?


https://tcec-chess.com/#div=sf&game=25&season=20
An obvious draw but Stockfish's evaluation was stuck at 0.18 until close to the 50 move rule.
For move 33 it said: 8.5% W | 87.8% D | 3.7% B, but it was 100% D, only an engine 800?, Elo below it would actually lose as black.
At move 39, 2nd diagram, it said: 7.4% W | 89.5% D | 3.1% B but only an engine that does not function properly, -1600 Elo?, could lose as black.

Stockfish 1/2-1/2 Lc0 , round 25.1 , D45 Semi-Slav

[FEN "4r1k1/6pp/2p5/2R3P1/4b2P/2B1PK2/1P6/8 w - - 5 33"]
33. Kg3 {TCEC 0.18} h5 {TCEC 0.10} 34. gxh6 gxh6  35. Rc4 Bd5 36. Rg4+ Kf7 37. Bd4 Rg8 38. Rxg8 Kxg8

[FEN "6k1/8/2p4p/3b4/3B3P/4P1K1/1P6/8 w - - 0 39"]
39. b4 {TCEC 0.18} h5 {TCEC 0.02} 40. Kf4 Kf7 41. e4 Bc4 42. Bc3 Ke6 43. Kg5 Be2 44. Bg7 Bf3 45. Kf4 Bg4 46. Kg5 Bf3 47. Kf4 Bg4 48. Bh6 Bd1 49. Bf8 Bg4 50. Bg7 Bh3 51. Bf8 Bg4
52. Ke3 Bh3 53. Kd4 Bg2 54. Bg7 Bh1 55. Bf8 Bg2 56. Bh6 Bh1 57. Bg5 Bf3 58. Bd8 Kd6 59. Bg5 Ke6 60. Bh6 Bh1 61. Ke3 Ke5 62. Bg7+ Ke6 63. Bb2 Bg2 64. Kf4 Bh3
65. Bc3 Bg4 66. Bg7 Bd1 67. Bh6 Bg4 68. Bf8 Bd1 69. Bc5 Be2 70. Ke3 Bd1 71. Ba7 Bc2 72. Bc5 Ke5 73. Bd4+ Ke6 74. Bb6 {1/2-1/2}
Up Topic The Rybka Lounge / Computer Chess / 5, 10, 20%? of TCEC SuFi draws from SF OCB blindness?

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