Bishop ( same color ) Endgame. SF kept all her pawns into same color as enemy bishop.

[Nay Lin Tun]

https://ibb.co/Dw9XbRH

[pgn][Event "CCC11 Finals! (30|5)"]
[Site "?"]
[Date "2019.12.18"]
[Round "1"]
[White "Lc0"]
[Black "Stockfish"]
[Result "1-0"]
[ECO "C67"]
[GameDuration "01:15:07"]
[GameEndTime "2019-12-18T16:30:56.825 PST"]
[GameStartTime "2019-12-18T15:15:48.926 PST"]
[Opening "Ruy Lopez"]
[PlyCount "225"]
[TimeControl "1800+5"]
[Variation "Berlin defense, Open Variation"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nxe5 Be7 7. Bf1 Nxe5 8.
Rxe5 O-O 9. Nc3 Ne8 10. Nd5 Bd6 11. Re1 c6 12. Ne3 Be7 13. c4 Nc7 14. d4 d5 15.
cxd5 Nxd5 16. Nxd5 cxd5 17. Bf4 Be6 18. Qb3 Qd7 19. Bb5 Qd8 20. Bd3 Qd7 21. Re2
a6 22. Rae1 g6 23. h3 Rac8 24. Bh6 Rfe8 25. Bc2 Bf6 26. Qe3 Bg7 27. Bxg7 Kxg7
28. Qd2 h5 29. a3 Qc6 30. Bb3 Qb5 31. Ba2 Bd7 32. Rxe8 Rxe8 33. Rxe8 Bxe8 34.
Qb4 Qc6 35. Qc3 Qxc3 36. bxc3 Bc6 37. h4 f6 38. Kh2 Kf7 39. Bb3 Ke6 40. Bd1 Be8
41. g4 hxg4 42. Bxg4+ Kd6 43. f4 f5 44. Bd1 Ke7 45. h5 Kf7 46. Kg3 Kg7 47. Kh4
Kh6 48. hxg6 Bxg6 49. Ba4 b5 50. Bc2 Bh7 51. Bb3 Bg8 52. Bd1 Bf7 53. Bf3 a5 54.
Bd1 Be8 55. Be2 Bd7 56. Bf3 Be6 57. Bh5 Bd7 58. Bf7 Bc6 59. Be6 Kg6 60. Bc8 Be8
61. Bb7 Bf7 62. Bc6 Kf6 63. Bd7 Kg6 64. Kg3 Kf6 65. Bxb5 Ke7 66. Kh4 Kf6 67. Be2
Be6 68. Kh5 Bc8 69. Kh6 Be6 70. Bf3 Bg8 71. Bh5 Be6 72. Kh7 Bd7 73. Kg8 Ke7 74.
Bf7 Bc6 75. Kg7 Ba8 76. Kg6 a4 77. Bg8 Bc6 78. Kxf5 Bb5 79. Bxd5 Kd6 80. c4 Bd7+
81. Kg6 Be8+ 82. Kg7 Bd7 83. Be4 Bh3 84. c5+ Kc7 85. f5 Bg4 86. f6 Bh5 87. Bd3
Kc6 88. Bf5 Kd5 89. Bd7 Ke4 90. Bxa4 Kd3 91. Bd7 Kd2 92. Bh3 Be8 93. Bc8 Ke3 94.
Bg4 Kxd4 95. c6 Bxc6 96. f7 Ke5 97. f8=Q Bh1 98. a4 Kd4 99. a5 Ke3 100. a6 Bg2
101. a7 Bh1 102. a8=Q Bxa8 103. Qxa8 Kd4 104. Qa3 Kc4 105. Be6+ Kd4 106. Kh6 Ke5
107. Qb4 Kxe6 108. Qc5 Kd7 109. Kg7 Ke8 110. Kf6 Kd7 111. Kf7 Kd8 112. Ke6 Ke8
113. Qc8# 1-0[/pgn]

[Jouni]

Fishcooking claims, that after 43...f5?? game is lost. Difficult position with 5 piece syzygy SF is long clueless

[d]4b3/1p6/p2k2p1/3p1p2/3P1PBP/P1P5/7K/8 w - - 0 1

Analysis by Stockfish 211119 64 BMI2:

44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7 51.Bc6 a5 52.Ba4 Ke6 53.Be8 Kf6 54.Kf3 Bd3 55.Bc6 Bc4 56.Kg3 Ke7 57.Ba4 Ke6 58.Be8 Kf6 59.Kf2
= (0.00) Depth: 56/46 00:00:36 278mN, tb=1168017
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7
= (0.00) Depth: 57/31 00:00:43 318mN, tb=1523000
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7
= (0.00) Depth: 58/27 00:00:52 373mN, tb=1806349
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7 51.Bc6 a5 52.Ba4 Ke6 53.Be8 Kf6 54.Kd2 Bb3 55.Ke3
= (0.00) Depth: 59/24 00:01:01 436mN, tb=2161699
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7
= (0.00) Depth: 60/39 00:01:10 496mN, tb=2737499
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7
= (0.00) Depth: 61/21 00:01:18 560mN, tb=3099522
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7 51.Bc6 a5 52.Ba4 Kf7 53.Bd1 Ke6 54.Bf3 Kd6 55.Kf2 Bb5 56.Kg3 Bc4
= (0.00) Depth: 62/27 00:01:25 613mN, tb=3343251
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7
= (0.00) Depth: 63/15 00:01:31 662mN, tb=3633674
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7 51.Bd1 Kd7 52.Kd2 Kd6 53.Ba4 Ke7 54.Bc6 Ke6 55.Be8 Kf6 56.Ke3 a5 57.Bc6 Ke7 58.Kd2 Ke6 59.Kc2 Ke7 60.Kb1 Ke6 61.Kb2 Kf6 62.Kc1 Ke6 63.Be8 Kf6
= (0.00) Depth: 64/51 00:01:56 851mN, tb=5154405
44.Bd1 Bb5 45.Bc2 b6 46.Kh3 Be2 47.Kg3 Ke7 48.Kf2 Bc4 49.Ke3 Ke6 50.Ba4 Ke7 51.Bd1 Kd7 52.Kd2 Kd6 53.Kc2 Ke6 54.Kb2 Kf6 55.Bc2 a5 56.Kc1 Ke6 57.Ba4 Kf6
= (0.00) Depth: 65/29 00:03:38 1591mN, tb=10597034

[peter]

Fishcooking claims, that after 43...f5?? game is lost. Difficult position with 5 piece syzygy SF is long clueless

[d]4b3/1p6/p2k2p1/3p1p2/3P1PBP/P1P5/7K/8 w - - 0 1

Postion before 44...f5? is a very deep Zugzwang avoid move test.

Crystal without tbs at 12x3GHz, 32G hash:

[d]4b3/1p6/p2k1pp1/3p4/3P1PBP/P1P5/7K/8 b - - 0 1

Analysis by Crystal 011219 64 POPCNT:

Code: Select all

43...f5 44.Ld1 a5 45.Kg3 Lb5 46.Kf2 Ld7 
  =/+  (-0.46)   Tiefe: 7/9   00:00:16  60kN
43...f5 44.Le2 Lf7 45.Kg3 a5 46.Kf2 b6 47.Kg3 Le6 
  =  (-0.18)   Tiefe: 8/12   00:00:16  140kN
43...f5 44.Le2 La4 45.Kg3 Lb3 46.Kf3 Lc2 47.Kf2 a5 48.Ke3 
  =  (-0.12)   Tiefe: 9/12   00:00:16  197kN
43...f5 44.Le2 a5 45.Kg3 b6 46.Kf2 La4 47.Ke3 Kc6 48.h5 gxh5 49.Lxh5 
  =  (-0.08)   Tiefe: 10/17   00:00:16  280kN
43...f5 44.Le2 a5 45.Kg3 b6 46.Kf3 Lc6 47.Ke3 La4 48.Kf2 Lc2 49.Kf3 Le4+ 50.Ke3 Ke6 
  =  (0.00)   Tiefe: 11/17   00:00:16  388kN
...
43...f5 44.Le2 a5 45.Kg3 Ld7 46.Lf3 Le6 47.Le2 
  =  (0.00)   Tiefe: 37/10   00:01:31  1836MN
43...f5 44.Lf3 
  =  (0.09 --)   Tiefe: 38/41   00:02:27  3189MN
43...f5 44.Le2 
  =  (0.19 --)   Tiefe: 38/48   00:02:31  3284MN
43...f5 44.Le2 
  +/=  (0.34 --)   Tiefe: 38/50   00:02:38  3468MN
43...f5 44.Le2 
  +/=  (0.54 --)   Tiefe: 38/84   00:02:46  3639MN
43...f5 44.Lf3 
  +/-  (0.81 --)   Tiefe: 38/84   00:02:59  3948MN
43...f5 44.Lf3 
  +/-  (1.17 --)   Tiefe: 38/84   00:03:33  4748MN
43...Lb5 
  +/-  (0.88 ++)   Tiefe: 38/84   00:04:07  5540MN
43...Lb5 
  =  (0.27 ++)   Tiefe: 38/84   00:04:27  5994MN
43...Lb5 44.Kg3 b6 45.f5 g5 46.hxg5 fxg5 47.Lf3 Ke7 48.Lxd5 Ld3 49.c4 Lxf5 50.c5 bxc5 51.dxc5 a5 52.Lb7 Kd7 53.Lf3 Ke6 54.Lg4 Lxg4 55.Kxg4 Kd5 56.Kxg5 Kxc5 57.Kf5 a4 58.Ke4 Kc4 59.Ke3 Kc3 60.Ke4 
  =  (0.00)   Tiefe: 38/84   00:04:43  6369MN
...
43...Lb5 44.Kg3 b6 45.f5 g5 46.hxg5 fxg5 47.Lf3 Ke7 48.Kg4 Kf6 49.Lxd5 Le2+ 50.Kg3 Kxf5 51.Kf2 Lh5 52.Ke3 a5 53.c4 Le8 54.Le4+ Kf6 55.Lf3 Ld7 56.Le4 
  =  (0.00)   Tiefe: 41/32   00:05:02  6832MN

CorChess has ...f5 with rising eval and changing to ...Bb5 in similiar time at another single try.
SF dev. with same hardware and also without tbs took 8' and depth 69 till eval of ...f5 started to climb.