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Up Topic The Rybka Lounge / Computer Chess / Stockfish's blockade optimism
- By MrKris (***) Date 2020-11-19 06:58
This position, white to move, is a TB draw (Shredderchess.com or Syzygy-6 in Stockfish with Syzygy50MoveRule On or Off)
8/4pk2/5p2/6r1/8/8/5Q2/5K2 w - - 0 1
In my post here http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=33726
the same except the e-pawn on e6 instead of e7, white wins, and, Cfish was able to win even without Syzygy.
Whatever caused that maybe is contributing the the optimism below.

So the top diagram should be a draw, I added a d-pawn to each side, d7/d2.
Both engines with Syzygy-6 and defaults.
Stockfish was very optimistic: +2.63 start, +3.19 move 41., +2.70 through move 83., then slowly declining to a draw on move 91.
Lc0 started with -0.52 (bad for black here), -0.20 move 61., 0.00 at the end.
[Event "G/5'+2'' | Syzygy 6"]
[Site "R7 2700X 14ths | RTX 2060 | Ponder On"]
[Date "+/- for the mover, 2020.11.18"]
[Round "?"]
[White "Stockfish_20111513"]
[Black "Lc0-.23.2_42850"]
[Result "1/2-1/2"]
[FEN "8/3ppk2/5p2/6r1/8/8/3P1Q2/5K2 w - - 0 1"]
[PlyCount "181"]
[SetUp "1"]
[Termination "adjudication"]
[TimeControl "300+2"]

1. Qd4 {+2.63/61 6.5s} Ke8 {-0.52/9 3.7s} 2. Ke2 {+2.63/54 4.4s}
Re5+ {-0.49/11 3.5s} 3. Kd3 {+2.63/57 4.9s} e6 {-0.50/11 3.8s}
4. Kc3 {+2.63/59 3.9s} Ke7 {-0.50/10 15s} 5. Qh4 {+3.09/46 5.9s}
Rc5+ {-0.51/11 0.22s} 6. Kb4 {+3.09/55 4.3s} Rd5 {-0.52/11 7.4s}
7. Qh7+ {+3.19/54 4.5s} Ke8 {-0.54/11 17s} 8. Qg8+ {+3.19/62 5.6s}
Ke7 {-0.56/11 0.006s} 9. Qg7+ {+3.19/65 5.1s} Kd8 {-0.57/11 13s}
10. Qh8+ {+3.19/69 6.3s} Ke7 {-0.54/11 8.6s} 11. Qg7+ {+3.19/70 0s}
Kd8 {-0.56/11 7.9s} 12. Qxf6+ {+3.19/73 7.2s} Kc7 {-0.58/10 6.6s}
13. Qf4+ {+3.19/74 0s} Kd8 {-0.54/9 7.3s} 14. Qg3 {+3.19/68 7.3s}
Rh5 {-0.52/9 14s} 15. d3 {+3.19/75 5.9s} Rd5 {-0.52/9 8.5s}
16. Qg8+ {+3.19/69 9.2s} Ke7 {-0.49/10 7.8s} 17. Qg7+ {+3.19/73 0s}
Kd8 {-0.43/9 6.0s} 18. Qf8+ {+3.19/70 6.4s} Kc7 {-0.45/10 0.012s}
19. Qf4+ {+3.19/70 9.1s} Kd8 {-0.42/9 13s} 20. Ka4 {+3.19/73 6.3s}
Rf5 {-0.39/9 11s} 21. Qh4+ {+3.19/75 0.001s} Kc7 {-0.39/9 7.4s}
22. Kb4 {+3.19/68 0.001s} Rd5 {-0.40/9 7.0s} 23. Ka4 {+3.19/68 6.5s}
Rf5 {-0.36/9 11s} 24. Qc4+ {+3.19/72 15s} Kd8 {-0.33/9 4.0s}
25. Qb4 {+3.19/69 6.9s} Rd5 {-0.33/9 6.9s} 26. Qh4+ {+3.19/65 0.001s}
Kc7 {-0.35/9 12s} 27. Qf4+ {+3.19/65 0.004s} Kd8 {-0.32/9 5.8s}
28. Kb4 {+3.19/64 7.0s} Rf5 {-0.36/10 7.8s} 29. Qe4 {+3.19/62 7.5s}
Rd5 {-0.32/8 8.3s} 30. Kb3 {+3.19/62 89s} Rb5+ {-0.30/8 9.4s}
31. Ka3 {+3.19/61 64s} Rd5 {-0.31/9 6.5s} 32. Kb4 {+3.19/59 47s}
Kc7 {-0.34/9 9.2s} 33. Kb3 {+3.19/56 7.6s} Rb5+ {-0.31/8 7.5s}
34. Kc3 {+3.19/56 2.4s} Rc5+ {-0.34/9 5.7s} 35. Kb4 {+3.19/54 3.8s}
Rd5 {-0.33/9 6.2s} 36. Kb3 {+3.19/50 1.9s} Rb5+ {-0.31/9 8.9s}
37. Kc2 {+3.19/49 1.2s} Rc5+ {-0.34/10 8.0s} 38. Kd2 {+3.19/48 8.8s}
Rd5 {-0.38/10 4.6s} 39. Qf4+ {+3.19/42 0.50s} Kd8 {-0.38/10 8.1s}
40. Qf8+ {+3.19/46 0.69s} Kc7 {-0.23/7 0.006s} 41. Qf4+ {+3.19/41 5.6s}
Kd8 {-0.37/10 14s} 42. Qh4+ {+3.12/34 0.40s} Kc7 {-0.39/9 9.9s}
43. Qb4 {+3.12/38 0s} Kd8 {-0.37/9 7.2s} 44. Qb8+ {+3.12/34 3.3s}
Ke7 {-0.18/6 0.038s} 45. Qb4+ {+3.04/33 1.5s} Kd8 {-0.35/10 7.1s}
46. Qb6+ {+3.12/33 1.6s} Ke8 {-0.38/10 11s} 47. Kc2 {+3.03/32 0s}
Ke7 {-0.38/9 6.0s} 48. Qb4+ {+2.70/35 2.3s} Kd8 {-0.34/9 5.3s}
49. Kb1 {+2.70/49 0.001s} Ke8 {-0.29/9 5.5s} 50. d4 {+2.70/59 1.0s}
Kf7 {-0.32/9 6.2s} 51. Qa4 {+2.70/61 1.1s} Ke8 {-0.25/8 4.9s}
52. Kb2 {+2.70/64 1.2s} Ke7 {-0.25/8 3.9s} 53. Kb3 {+2.70/69 0s}
Kd8 {-0.26/8 4.8s} 54. Kc3 {+2.70/70 1.5s} Rf5 {-0.27/8 4.1s}
55. Qa8+ {+2.70/70 1.7s} Ke7 {-0.28/8 3.5s} 56. Kc4 {+2.70/72 0s}
Rh5 {-0.25/8 4.1s} 57. Qa3+ {+2.70/70 0s} Ke8 {-0.24/8 3.5s}
58. Qd6 {+2.70/71 2.0s} Rd5 {-0.23/9 3.8s} 59. Qg3 {+2.70/67 2.0s}
Kd8 {-0.20/8 2.8s} 60. Qg4 {+2.70/65 3.2s} Rf5 {-0.19/8 3.1s}
61. Qh4+ {+2.70/67 2.6s} Kc7 {-0.20/8 2.7s} 62. Qg3+ {+2.70/66 0s}
Kd8 {-0.18/8 2.4s} 63. Qd6 {+2.70/63 0.35s} Rd5 {-0.16/8 3.5s}
64. Qh2 {+2.70/63 14s} Rf5 {-0.17/8 1.5s} 65. Qd6 {+2.70/63 0.97s}
Rd5 {-0.15/8 3.7s} 66. Qb8+ {+2.70/61 8.7s} Ke7 {-0.17/8 0.014s}
67. Qb4+ {+2.70/56 0.42s} Kd8 {-0.14/8 4.6s} 68. Qf8+ {+2.70/60 1.0s}
Kc7 {-0.14/8 0.015s} 69. Qf4+ {+2.70/56 1.2s} Kd8 {-0.12/8 4.7s}
70. Kc3 {+2.70/54 0.74s} Rf5 {-0.14/8 2.6s} 71. Qg4 {+2.70/52 4.4s}
Rd5 {-0.11/7 1.7s} 72. Qh4+ {+2.70/51 5.1s} Kc7 {-0.12/8 2.1s}
73. Qg3+ {+2.70/48 0.51s} Kd8 {-0.11/8 2.6s} 74. Kc4 {+2.70/49 3.4s}
Rf5 {-0.11/7 1.8s} 75. Qh2 {+2.70/46 0.89s} Rd5 {-0.09/7 1.9s}
76. Kb4 {+2.70/45 0.96s} Kc8 {-0.10/7 2.5s} 77. Qg1 {+2.70/40 4.4s}
Kc7 {-0.08/7 2.5s} 78. Qg7 {+2.70/41 0.001s} Kd8 {-0.08/7 2.1s}
79. Kc4 {+2.70/41 4.1s} Kc7 {-0.10/8 1.8s} 80. Qg6 {+2.70/35 2.4s}
Rf5 {-0.09/7 2.2s} 81. Kb4 {+2.70/34 0.28s} Rd5 {-0.07/7 1.6s}
82. Qg3+ {+2.70/34 0.44s} Kd8 {-0.08/7 2.2s} 83. Kb3 {+2.70/31 1.1s}
Kc8 {-0.07/7 2.4s} 84. Qc3+ {+2.37/28 1.8s} Kd8 {-0.06/7 1.3s}
85. Qg3 {+2.18/39 5.4s} Kc8 {-0.05/7 2.8s} 86. Kc3 {+1.55/23 2.9s}
Kd8 {-0.05/7 1.9s} 87. Qh4+ {+1.44/19 1.3s} Kc7 {-0.05/7 2.1s}
88. Qf4+ {+1.07/21 0.60s} Kc8 {-0.05/7 1.9s} 89. Kd3 {0.00/27 2.5s}
Kd8 {-0.05/7 2.2s} 90. Qh4+ {0.00/34 0.45s} Kc7 {-0.05/7 2.0s}
91. Qe1 {0.00/40 0s, Draw by adjudication} 1/2-1/2
Up Topic The Rybka Lounge / Computer Chess / Stockfish's blockade optimism

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