SF10 on zugzwang and lost. Engine immortal zugzwang

[MikeGL]

Position after 37.Bd4 of white.
[D]5r2/3b1P1r/2k1p2p/3pP1pB/p1pB4/P1P2R2/2P3P1/2K5 b - - 3 37


This position looks harmless, where Leelenstein is down an exchange (B for a R), and SF10 seems to hold with a fortress.
But exactly 12 moves from this position Leelenstein would give a beautiful zugzwang,
by first attacking h6 with Kh5! then invading b-file with Rb1 resulting to a win against the mighty SF10.

[pgn] [Event "CCC 7: Blitz Bonanza Final (5|2)"] [Site "?"] [Date "2019.04.06"] [Round "1"] [White "Leelenstein"] [Black "Stockfish"] [Result "1-0"] [Variation "Winawer, Advance Variation"] [TimeControl "300+2"] [Termination "normal"] [PlyCount "259"] [WhiteType "engine"] [BlackType "engine"] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qa5 7. Bd2 Qa4 8. h4 Ne7 9. Qg4 Kf8 10. h5 h6 11. Rh3 Nbc6 12. Qf4 b6 13. Rf3 Nd8 14. dxc5 Qxf4 15. Bxf4 bxc5 16. Be3 c4 17. Rh3 f6 18. f4 fxe5 19. fxe5 Nf7 20. Nf3 Nc6 21. Bf4 Ke7 22. Be2 Rg8 23. O-O-O Bd7 24. Nh4 Kd8 25. Ng6 a5 26. Rf1 Ne7 27. Bg4 Nxg6 28. hxg6 Nh8 29. Bh5 Kc7 30. Be3 Kc6 31. Rf7 a4 32. Rhf3 Nxf7 33. gxf7 Rh8 34. Bf2 Raf8 35. Bh4 g5 36. Bf2 Rh7 37. Bd4 Rhh8 38. Rf6 Kb5 39. Kd2 Kc6 40. Ke3 Kb5 41. Kf3 Kc6 42. Kg4 Bc8 43. Bg6 Bd7 44. Kh5 Kb5 45. g3 Rb8 46. Rf1 Kc6 47. Rf6 Kb5 48. Rf1 Kc6 49. g4 Rbf8 50. Rb1 Ra8 51. Rb4 Ra6 52. Bh7 Rf8 53. Kg6 Ra5 54. Rb6+ Kc7 55. Kg7 Raa8 56. Bc5 Rfc8 57. Rd6 Rcb8 58. Bg6 Rh8 59. Kf6 Rab8 60. Ra6 Rbc8 61. Ra7+ Kc6 62. Bd6 Rcd8 63. Rxa4 h5 64. gxh5 g4 65. Rb4 g3 66. Rb1 Bc8 67. Rg1 d4 68. Be4+ Kb5 69. a4+ Ka6 70. Rxg3 d3 71. cxd3 Bd7 72. dxc4 Rc8 73. Rg7 Rcd8 74. c5 Rc8 75. Bd3+ Ka5 76. Rg4 Bc6 77. Rb4 Bd5 78. Rb6 Kxa4 79. c6 Bxc6 80. Rb4+ Ka3 81. Rb6+ Ka2 82. Bb1+ Ka1 83. Bg6 Bf3 84. c4 Ka2 85. Ra6+ Kb2 86. Rb6+ Kc3 87. c5 Ra8 88. c6 Rh6 89. Bb4+ Kd4 90. c7 Rhh8 91. Rd6+ Kc4 92. Rxe6 Kxb4 93. Rd6 Rhc8 94. e6 Kc5 95. Rd3 Be2 96. Rc3+ Kb4 97. Rc2 Bg4 98. e7 Bd7 99. h6 Kb3 100. Rc5 Rh8 101. h7 Rac8 102. Be4 Kb4 103. Rc1 Ka5 104. Ke5 Bg4 105. Ra1+ Kb6 106. Rb1+ Ka5 107. Rb7 Rce8 108. c8=Q Rxc8 109. f8=Q Rcxf8 110. exf8=Q Rxf8 111. Rg7 Re8+ 112. Kf6 Bc8 113. Rg8 Re6+ 114. Kg5 Rxe4 115. h8=Q Rg4+ 116. Kh5 Rxg8 117. Qxg8 Ba6 118. Qb3 Bf1 119. Qa2+ Kb4 120. Qb1+ Ka3 121. Qxf1 Kb4 122. Kg4 Kc5 123. Qd3 Kb4 124. Kf5 Kc5 125. Ke5 Kc6 126. Qd5+ Kc7 127. Qb5 Kd8 128. Kd6 Kc8 129. Qb3 Kd8 130. Qb8# 1-0 [/pgn]

[Event "CCC 7: Blitz Bonanza Final (5|2)"]
[Site "?"]
[Date "2019.04.06"]
[Round "1"]
[White "Leelenstein"]
[Black "Stockfish"]
[Result "1-0"]
[Variation "Winawer, Advance Variation"]
[TimeControl "300+2"]
[Termination "normal"]
[PlyCount "259"]
[WhiteType "human"]
[BlackType "human"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qa5 7. Bd2 Qa4 8.
h4 Ne7 9. Qg4 Kf8 10. h5 h6 11. Rh3 Nbc6 12. Qf4 b6 13. Rf3 Nd8 14. dxc5
Qxf4 15. Bxf4 bxc5 16. Be3 c4 17. Rh3 f6 18. f4 fxe5 19. fxe5 Nf7 20. Nf3
Nc6 21. Bf4 Ke7 22. Be2 Rg8 23. O-O-O Bd7 24. Nh4 Kd8 25. Ng6 a5 26. Rf1
Ne7 27. Bg4 Nxg6 28. hxg6 Nh8 29. Bh5 Kc7 30. Be3 Kc6 31. Rf7 a4 32. Rhf3
Nxf7 33. gxf7 Rh8 34. Bf2 Raf8 35. Bh4 g5 36. Bf2 Rh7 37. Bd4 Rhh8 38. Rf6
Kb5 39. Kd2 Kc6 40. Ke3 Kb5 41. Kf3 Kc6 42. Kg4 Bc8 43. Bg6 Bd7 44. Kh5 Kb5
45. g3 Rb8 46. Rf1 Kc6 47. Rf6 Kb5 48. Rf1 Kc6 49. g4 Rbf8 50. Rb1 Ra8 51.
Rb4 Ra6 52. Bh7 Rf8 53. Kg6 Ra5 54. Rb6+ Kc7 55. Kg7 Raa8 56. Bc5 Rfc8 57.
Rd6 Rcb8 58. Bg6 Rh8 59. Kf6 Rab8 60. Ra6 Rbc8 61. Ra7+ Kc6 62. Bd6 Rcd8
63. Rxa4 h5 64. gxh5 g4 65. Rb4 g3 66. Rb1 Bc8 67. Rg1 d4 68. Be4+ Kb5 69.
a4+ Ka6 70. Rxg3 d3 71. cxd3 Bd7 72. dxc4 Rc8 73. Rg7 Rcd8 74. c5 Rc8 75.
Bd3+ Ka5 76. Rg4 Bc6 77. Rb4 Bd5 78. Rb6 Kxa4 79. c6 Bxc6 80. Rb4+ Ka3 81.
Rb6+ Ka2 82. Bb1+ Ka1 83. Bg6 Bf3 84. c4 Ka2 85. Ra6+ Kb2 86. Rb6+ Kc3 87.
c5 Ra8 88. c6 Rh6 89. Bb4+ Kd4 90. c7 Rhh8 91. Rd6+ Kc4 92. Rxe6 Kxb4 93.
Rd6 Rhc8 94. e6 Kc5 95. Rd3 Be2 96. Rc3+ Kb4 97. Rc2 Bg4 98. e7 Bd7 99. h6
Kb3 100. Rc5 Rh8 101. h7 Rac8 102. Be4 Kb4 103. Rc1 Ka5 104. Ke5 Bg4 105.
Ra1+ Kb6 106. Rb1+ Ka5 107. Rb7 Rce8 108. c8=Q Rxc8 109. f8=Q Rcxf8 110.
exf8=Q Rxf8 111. Rg7 Re8+ 112. Kf6 Bc8 113. Rg8 Re6+ 114. Kg5 Rxe4 115.
h8=Q Rg4+ 116. Kh5 Rxg8 117. Qxg8 Ba6 118. Qb3 Bf1 119. Qa2+ Kb4 120. Qb1+
Ka3 121. Qxf1 Kb4 122. Kg4 Kc5 123. Qd3 Kb4 124. Kf5 Kc5 125. Ke5 Kc6 126.
Qd5+ Kc7 127. Qb5 Kd8 128. Kd6 Kc8 129. Qb3 Kd8 130. Qb8# 1-0

[D]1r5r/3b1P2/2k1p1Bp/3pP1pK/p1pB2P1/P1P5/2P5/5R2 b - - 0 49
After 49.g4 of Leelenstein, black is in zugzwang because:

-Rh8 can't move due to h6 pawn falling,
-Bd7 can't move due to f8 square f7-f8(Q),
-Kc6 can't move due to Bc5 attacking f8 square again for f7-f8 push,
-Rb8 can't move because of b-file invasion with Rb1! of white.

So there are no weaknesses for black now but it is forced to move and create one weakness.
A beautiful zugzwang position against SF10 which is fatal.

It's rare to see zugzwang wins in A/B vs. A/B engines because both A/B engines can't see the zugzwang ahead.
Thats a given typical problem with A/B engines due to those null move tricks.

Game credit goes to CCC engine tourn.

[MikeGL]

Very tough positional sacrifice leading to another zugzwang and wins.
position arised after 28...Kf7 of black which looks equal but decisive due to zugzwang.
[D]5r2/p4k1p/1pb1q1pP/2p1PpQ1/2Pp1P2/3B4/P1P3P1/4R1K1 w - - 3 29
g4! is best move as played in text. This leads to a forced win for white even analyzed by SF10 on my humble machine.
It's a win due to zugzwang.

The resulting position where black is in zugzwang and must make a weak move:
[D]6r1/p4k1p/1p2q1pP/2p1P1Q1/2P2Pp1/2p2bK1/P1B5/4R3 b - - 1 33


Complete game:
[Event "CCC 7: Blitz Bonanza Final (5|2)"]
[Site "?"]
[Date "2019.04.10"]
[Round "1"]
[White "Lc0"]
[Black "Stockfish"]
[Result "1-0"]
[ECO "C43"]
[GameDuration "00:15:32"]
[GameEndTime "2019-04-10T06:01:20.065 PDT"]
[GameStartTime "2019-04-10T05:45:47.882 PDT"]
[Opening "Petrov"]
[PlyCount "183"]
[TimeControl "300+2"]
[Variation "Modern attack, Symmetrical Variation"]

1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Nd7 6. Nxd7 Bxd7 7. O-O Bd6 8.
Nc3 Nxc3 9. bxc3 O-O 10. Qh5 f5 11. Bg5 Qe8 12. Qf3 Qg6 13. Bd2 Bc6 14. h3 Rae8
15. Bf4 Qf6 16. Qg3 g6 17. Rae1 Bd7 18. h4 Bxf4 19. Qxf4 c5 20. Re5 Rxe5 21.
dxe5 Qe7 22. Re1 b6 23. c4 d4 24. h5 Kg7 25. h6+ Kg8 26. Qg3 Qe6 27. f4 Bc6 28.
Qg5 Kf7 29. g4 Rg8 30. Kf2 fxg4 31. Kg3 Bf3 32. c3 dxc3 33. Bc2 b5 34. cxb5 c4
35. a3 Bd5 36. Rd1 Rf8 37. a4 Ra8 38. a5 Rf8 39. Rd4 Rb8 40. Ba4 Kg8 41. Rd1 Rf8
42. Qxg4 Qxg4+ 43. Kxg4 Be4 44. Rc1 Bf5+ 45. Kg3 Be6 46. Rxc3 Rb8 47. Kf2 Kf7
48. Ke3 g5 49. f5 Bxf5 50. Rxc4 Kg6 51. Rc6+ Kh5 52. e6 Bg6 53. b6 axb6 54. Rxb6
Rc8 55. a6 Rc7 56. Bc6 g4 57. Bb7 Rc3+ 58. Kd4 Rd3+ 59. Kc5 Ra3 60. e7 Be8 61.
Rd6 Kg5 62. Rd8 Bf7 63. e8=Q Bxe8 64. Rxe8 Kf6 65. Kb6 Rb3+ 66. Ka7 Kg5 67. Kb8
Ra3 68. a7 Rxa7 69. Kxa7 Kxh6 70. Bc8 Kg5 71. Bxg4 Kxg4 72. Kb6 h5 73. Kc5 h4
74. Kd4 h3 75. Ke3 h2 76. Rg8+ Kh4 77. Kf2 Kh3 78. Rh8+ Kg4 79. Rxh2 Kf5 80. Ke3
Ke5 81. Rh5+ Kd6 82. Ke4 Kc6 83. Rd5 Kc7 84. Ke5 Kc6 85. Ke6 Kc7 86. Rd6 Kc8 87.
Rc6+ Kb7 88. Kd7 Kb8 89. Rb6+ Ka8 90. Kc7 Ka7 91. Rc6 Ka8 92. Ra6# 1-0

[pgn] [Event "CCC 7: Blitz Bonanza Final (5|2)"] [Site "?"] [Date "2019.04.10"] [Round "1"] [White "Lc0"] [Black "Stockfish"] [Result "1-0"] [ECO "C43"] [GameDuration "00:15:32"] [GameEndTime "2019-04-10T06:01:20.065 PDT"] [GameStartTime "2019-04-10T05:45:47.882 PDT"] [Opening "Petrov"] [PlyCount "183"] [TimeControl "300+2"] [Variation "Modern attack, Symmetrical Variation"] 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Nd7 6. Nxd7 Bxd7 7. O-O Bd6 8. Nc3 Nxc3 9. bxc3 O-O 10. Qh5 f5 11. Bg5 Qe8 12. Qf3 Qg6 13. Bd2 Bc6 14. h3 Rae8 15. Bf4 Qf6 16. Qg3 g6 17. Rae1 Bd7 18. h4 Bxf4 19. Qxf4 c5 20. Re5 Rxe5 21. dxe5 Qe7 22. Re1 b6 23. c4 d4 24. h5 Kg7 25. h6+ Kg8 26. Qg3 Qe6 27. f4 Bc6 28. Qg5 Kf7 29. g4 Rg8 30. Kf2 fxg4 31. Kg3 Bf3 32. c3 dxc3 33. Bc2 b5 34. cxb5 c4 35. a3 Bd5 36. Rd1 Rf8 37. a4 Ra8 38. a5 Rf8 39. Rd4 Rb8 40. Ba4 Kg8 41. Rd1 Rf8 42. Qxg4 Qxg4+ 43. Kxg4 Be4 44. Rc1 Bf5+ 45. Kg3 Be6 46. Rxc3 Rb8 47. Kf2 Kf7 48. Ke3 g5 49. f5 Bxf5 50. Rxc4 Kg6 51. Rc6+ Kh5 52. e6 Bg6 53. b6 axb6 54. Rxb6 Rc8 55. a6 Rc7 56. Bc6 g4 57. Bb7 Rc3+ 58. Kd4 Rd3+ 59. Kc5 Ra3 60. e7 Be8 61. Rd6 Kg5 62. Rd8 Bf7 63. e8=Q Bxe8 64. Rxe8 Kf6 65. Kb6 Rb3+ 66. Ka7 Kg5 67. Kb8 Ra3 68. a7 Rxa7 69. Kxa7 Kxh6 70. Bc8 Kg5 71. Bxg4 Kxg4 72. Kb6 h5 73. Kc5 h4 74. Kd4 h3 75. Ke3 h2 76. Rg8+ Kh4 77. Kf2 Kh3 78. Rh8+ Kg4 79. Rxh2 Kf5 80. Ke3 Ke5 81. Rh5+ Kd6 82. Ke4 Kc6 83. Rd5 Kc7 84. Ke5 Kc6 85. Ke6 Kc7 86. Rd6 Kc8 87. Rc6+ Kb7 88. Kd7 Kb8 89. Rb6+ Ka8 90. Kc7 Ka7 91. Rc6 Ka8 92. Ra6# 1-0 [/pgn]
To be fair with SF10, here's its beautiful win against Lc0 on the same tourn with a
difficult SF tactical shots with series of two different mating nets forcing Lc0 to give up many materials.

[Event "CCC 7: Blitz Bonanza Final (5|2)"]
[Site "?"]
[Date "2019.04.08"]
[Round "1"]
[White "Lc0"]
[Black "Stockfish"]
[Result "0-1"]
[ECO "C19"]
[GameDuration "00:18:54"]
[GameEndTime "2019-04-08T05:45:18.912 PDT"]
[GameStartTime "2019-04-08T05:26:24.116 PDT"]
[Opening "French"]
[PlyCount "262"]
[TimeControl "300+2"]
[Variation "Winawer, Advance, 6...Ne7"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. h4 Qc7 8. Rb1
Nbc6 9. h5 h6 10. Nf3 b6 11. a4 Bd7 12. Rh3 Na5 13. Ra1 Bc6 14. Qd2 c4 15. Be2
O-O-O 16. Qf4 Rdf8 17. Ba3 Be8 18. Kd2 Kb7 19. Qh4 Nf5 20. Qf4 Rfg8 21. g4 Ne7
22. Rhh1 Nc8 23. Nh4 a6 24. Rhg1 Ka7 25. Qg3 Bxa4 26. f4 Nb7 27. f5 Nd8 28. g5
hxg5 29. Qxg5 exf5 30. Raf1 Qb7 31. Nxf5 Ne6 32. Qg3 a5 33. Qf3 Be8 34. Rg3 g5
35. Rh1 Rh7 36. Ne3 Rgh8 37. Rgg1 Ka6 38. Qf6 Rh6 39. Qf2 Bc6 40. Qg3 R6h7 41.
Rf1 Na7 42. Nf5 Nc8 43. Ne3 Na7 44. Nf5 Nc8 45. Qg2 Qd7 46. h6 Bb7 47. Bf3 Qd8
48. Rhg1 Qd7 49. Rh1 Qd8 50. Rhg1 Rg8 51. Bh5 Bc6 52. Kc1 Rgh8 53. Bf3 Qd7 54.
Rh1 Qd8 55. Rhg1 Qd7 56. Rh1 Qd8 57. Qg3 Nc7 58. Bg2 Ne6 59. Kb1 Bb7 60. Bf3 Qd7
61. Bg4 Qa4 62. Bb2 Qc6 63. Rh5 Rg8 64. Bc1 Qb5+ 65. Bb2 Nf4 66. Rh2 Qc6 67. Bc1
Qb5+ 68. Ka2 Qa4+ 69. Kb2 Qb5+ 70. Ka1 Qa4+ 71. Kb2 Qb5+ 72. Ka2 Qa4+ 73. Kb1
Qb5+ 74. Bb2 Qc6 75. Bh5 Nxh5 76. Rxh5 f6 77. Rh2 Rgh8 78. Bc1 Qb5+ 79. Bb2 Qc6
80. Rhf2 fxe5 81. dxe5 Na7 82. Re1 Nb5 83. e6 Bc8 84. Rfe2 Rg8 85. Re5 g4 86.
Qe3 Rgh8 87. Bc1 Rxh6 88. Nxh6 Rxh6 89. Bb2 Rh3 90. Qe2 Nc7 91. e7 Bd7 92. Rg5
Rh6 93. Qe3 Kb7 94. Rg7 Ne8 95. Rg5 Nc7 96. Qd2 Rh7 97. Bc1 Qb5+ 98. Bb2 Qc6 99.
Qe2 Rh6 100. Qf2 Rh3 101. Rg8 Ne8 102. Qd2 Nf6 103. Rd8 Ka6 104. Qf2 Rf3 105.
Qe2 Ne4 106. Qd1 Nf6 107. Re5 Be8 108. Qe2 Rh3 109. Rf5 Rh6 110. Rf1 Ne4 111.
Rd1 Bf7 112. Qe3 Re6 113. Ba3 g3 114. Rg1 Rf6 115. Qd4 g2 116. Rxg2 Rf1+ 117.
Ka2 Qb5 118. Bb2 Qa4+ 119. Ba3 Ra1+ 120. Kxa1 Qxa3+ 121. Kb1 Nxc3+ 122. Qxc3
Qxc3 123. Re2 Qb4+ 124. Kc1 c3 125. Re6 Qf4+ 126. Kb1 Qf1+ 127. Ka2 Qc4+ 128.
Ka1 Qa4+ 129. Kb1 Qb5+ 130. Kc1 Qf1+ 131. Re1 Qxe1# 0-1
[pgn] [Event "CCC 7: Blitz Bonanza Final (5|2)"] [Site "?"] [Date "2019.04.08"] [Round "1"] [White "Lc0"] [Black "Stockfish"] [Result "0-1"] [ECO "C19"] [GameDuration "00:18:54"] [GameEndTime "2019-04-08T05:45:18.912 PDT"] [GameStartTime "2019-04-08T05:26:24.116 PDT"] [Opening "French"] [PlyCount "262"] [TimeControl "300+2"] [Variation "Winawer, Advance, 6...Ne7"] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. h4 Qc7 8. Rb1 Nbc6 9. h5 h6 10. Nf3 b6 11. a4 Bd7 12. Rh3 Na5 13. Ra1 Bc6 14. Qd2 c4 15. Be2 O-O-O 16. Qf4 Rdf8 17. Ba3 Be8 18. Kd2 Kb7 19. Qh4 Nf5 20. Qf4 Rfg8 21. g4 Ne7 22. Rhh1 Nc8 23. Nh4 a6 24. Rhg1 Ka7 25. Qg3 Bxa4 26. f4 Nb7 27. f5 Nd8 28. g5 hxg5 29. Qxg5 exf5 30. Raf1 Qb7 31. Nxf5 Ne6 32. Qg3 a5 33. Qf3 Be8 34. Rg3 g5 35. Rh1 Rh7 36. Ne3 Rgh8 37. Rgg1 Ka6 38. Qf6 Rh6 39. Qf2 Bc6 40. Qg3 R6h7 41. Rf1 Na7 42. Nf5 Nc8 43. Ne3 Na7 44. Nf5 Nc8 45. Qg2 Qd7 46. h6 Bb7 47. Bf3 Qd8 48. Rhg1 Qd7 49. Rh1 Qd8 50. Rhg1 Rg8 51. Bh5 Bc6 52. Kc1 Rgh8 53. Bf3 Qd7 54. Rh1 Qd8 55. Rhg1 Qd7 56. Rh1 Qd8 57. Qg3 Nc7 58. Bg2 Ne6 59. Kb1 Bb7 60. Bf3 Qd7 61. Bg4 Qa4 62. Bb2 Qc6 63. Rh5 Rg8 64. Bc1 Qb5+ 65. Bb2 Nf4 66. Rh2 Qc6 67. Bc1 Qb5+ 68. Ka2 Qa4+ 69. Kb2 Qb5+ 70. Ka1 Qa4+ 71. Kb2 Qb5+ 72. Ka2 Qa4+ 73. Kb1 Qb5+ 74. Bb2 Qc6 75. Bh5 Nxh5 76. Rxh5 f6 77. Rh2 Rgh8 78. Bc1 Qb5+ 79. Bb2 Qc6 80. Rhf2 fxe5 81. dxe5 Na7 82. Re1 Nb5 83. e6 Bc8 84. Rfe2 Rg8 85. Re5 g4 86. Qe3 Rgh8 87. Bc1 Rxh6 88. Nxh6 Rxh6 89. Bb2 Rh3 90. Qe2 Nc7 91. e7 Bd7 92. Rg5 Rh6 93. Qe3 Kb7 94. Rg7 Ne8 95. Rg5 Nc7 96. Qd2 Rh7 97. Bc1 Qb5+ 98. Bb2 Qc6 99. Qe2 Rh6 100. Qf2 Rh3 101. Rg8 Ne8 102. Qd2 Nf6 103. Rd8 Ka6 104. Qf2 Rf3 105. Qe2 Ne4 106. Qd1 Nf6 107. Re5 Be8 108. Qe2 Rh3 109. Rf5 Rh6 110. Rf1 Ne4 111. Rd1 Bf7 112. Qe3 Re6 113. Ba3 g3 114. Rg1 Rf6 115. Qd4 g2 116. Rxg2 Rf1+ 117. Ka2 Qb5 118. Bb2 Qa4+ 119. Ba3 Ra1+ 120. Kxa1 Qxa3+ 121. Kb1 Nxc3+ 122. Qxc3 Qxc3 123. Re2 Qb4+ 124. Kc1 c3 125. Re6 Qf4+ 126. Kb1 Qf1+ 127. Ka2 Qc4+ 128. Ka1 Qa4+ 129. Kb1 Qb5+ 130. Kc1 Qf1+ 131. Re1 Qxe1# 0-1 [/pgn]
Here's probably the best draw of their match up because of material imbalance and both sides fighting hard.
[Event "CCC 7: Blitz Bonanza Final (5|2)"]
[Site "?"]
[Date "2019.04.07"]
[Round "1"]
[White "Lc0"]
[Black "Stockfish"]
[Result "1/2-1/2"]
[ECO "C24"]
[GameDuration "00:14:55"]
[GameEndTime "2019-04-07T00:58:39.165 PDT"]
[GameStartTime "2019-04-07T00:43:43.438 PDT"]
[Opening "Bishop's Opening"]
[PlyCount "148"]
[TimeControl "300+2"]
[Variation "Berlin defense"]

1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nf3 Bc5 5. O-O d6 6. c3 O-O 7. Bg5 h6 8. Bh4 g5
9. Bg3 a6 10. Nbd2 Ba7 11. Bb3 Na5 12. Bc2 Nh5 13. b4 Nxg3 14. hxg3 Nc6 15. Nc4
Be6 16. Bb3 Kg7 17. Qd2 Re8 18. Rae1 Qe7 19. Ne3 Bxe3 20. Rxe3 Bxb3 21. axb3 f6
22. Nh2 Rad8 23. f4 Rf8 24. Qd1 Qd7 25. Ree1 Ne7 26. d4 Qc6 27. Qd2 Qd7 28. fxe5
dxe5 29. d5 c6 30. c4 h5 31. Rf2 cxd5 32. exd5 Ng6 33. Qe3 Rde8 34. Nf3 Qg4 35.
Nd2 h4 36. gxh4 Qxh4 37. g3 Qg4 38. Ne4 Nf4 39. Rh2 Nh3+ 40. Kg2 Nf4+ 41. Kf2
Nh3+ 42. Kg2 Nf4+ 43. Kf1 Rh8 44. Nf2 Rxh2 45. Nxg4 Rh1+ 46. Kf2 Rxe1 47. Qb6
Nd3+ 48. Kg2 Rf8 49. Qc7+ Rf7 50. d6 Re2+ 51. Kf1 Re1+ 52. Kg2 Re2+ 53. Kf3 Nc1
54. Nh6 Rxc7 55. Nf5+ Kg6 56. dxc7 Kxf5 57. c8=Q+ Kg6 58. Qg8+ Kh6 59. Qh8+ Kg6
60. Qe8+ Kh6 61. Qf8+ Kg6 62. Qe8+ Kh6 63. g4 e4+ 64. Kg3 Nd3 65. Qf7 Re3+ 66.
Kh2 Re2+ 67. Kh1 Re1+ 68. Kg2 Re2+ 69. Kg1 Re1+ 70. Kh2 Re2+ 71. Kg3 Re3+ 72.
Kg2 Re2+ 73. Kg1 Re1+ 74. Kg2 Re2+ 1/2-1/2

[pgn] [Event "CCC 7: Blitz Bonanza Final (5|2)"] [Site "?"] [Date "2019.04.07"] [Round "1"] [White "Lc0"] [Black "Stockfish"] [Result "1/2-1/2"] [ECO "C24"] [GameDuration "00:14:55"] [GameEndTime "2019-04-07T00:58:39.165 PDT"] [GameStartTime "2019-04-07T00:43:43.438 PDT"] [Opening "Bishop's Opening"] [PlyCount "148"] [TimeControl "300+2"] [Variation "Berlin defense"] 1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nf3 Bc5 5. O-O d6 6. c3 O-O 7. Bg5 h6 8. Bh4 g5 9. Bg3 a6 10. Nbd2 Ba7 11. Bb3 Na5 12. Bc2 Nh5 13. b4 Nxg3 14. hxg3 Nc6 15. Nc4 Be6 16. Bb3 Kg7 17. Qd2 Re8 18. Rae1 Qe7 19. Ne3 Bxe3 20. Rxe3 Bxb3 21. axb3 f6 22. Nh2 Rad8 23. f4 Rf8 24. Qd1 Qd7 25. Ree1 Ne7 26. d4 Qc6 27. Qd2 Qd7 28. fxe5 dxe5 29. d5 c6 30. c4 h5 31. Rf2 cxd5 32. exd5 Ng6 33. Qe3 Rde8 34. Nf3 Qg4 35. Nd2 h4 36. gxh4 Qxh4 37. g3 Qg4 38. Ne4 Nf4 39. Rh2 Nh3+ 40. Kg2 Nf4+ 41. Kf2 Nh3+ 42. Kg2 Nf4+ 43. Kf1 Rh8 44. Nf2 Rxh2 45. Nxg4 Rh1+ 46. Kf2 Rxe1 47. Qb6 Nd3+ 48. Kg2 Rf8 49. Qc7+ Rf7 50. d6 Re2+ 51. Kf1 Re1+ 52. Kg2 Re2+ 53. Kf3 Nc1 54. Nh6 Rxc7 55. Nf5+ Kg6 56. dxc7 Kxf5 57. c8=Q+ Kg6 58. Qg8+ Kh6 59. Qh8+ Kg6 60. Qe8+ Kh6 61. Qf8+ Kg6 62. Qe8+ Kh6 63. g4 e4+ 64. Kg3 Nd3 65. Qf7 Re3+ 66. Kh2 Re2+ 67. Kh1 Re1+ 68. Kg2 Re2+ 69. Kg1 Re1+ 70. Kh2 Re2+ 71. Kg3 Re3+ 72. Kg2 Re2+ 73. Kg1 Re1+ 74. Kg2 Re2+ 1/2-1/2 [/pgn]
Great stuff.
Game credit goes to CCC7 Engine tourn.
https://www.chess.com/computer-chess-championship
Have seen from this tourn that a specific line in Pirc similar to a sicilian dragon was a forced loss for black after g4 followed by
h5 giving up two pawns for a K-side attack of white. Game shown as decisive 1-0 by Lc0.

[MikeB]

Very tough positional sacrifice leading to another zugzwang and wins.
position arised after 28...Kf7 of black which looks equal but decisive due to zugzwang.
[D]5r2/p4k1p/1pb1q1pP/2p1PpQ1/2Pp1P2/3B4/P1P3P1/4R1K1 w - - 3 29
g4! is best move as played in text. This leads to a forced win for white even analyzed by SF10 on my humble machine.
It's a win due to zugzwang.

The resulting position where black is in zugzwang and must make a weak move:
[D]6r1/p4k1p/1p2q1pP/2p1P1Q1/2P2Pp1/2p2bK1/P1B5/4R3 b - - 1 33

...
<deleted>

love positions like this Mike - thx for sharing...

Current dev McCain will find g4 eventually in single core/thrread mode , but it does take quite a while.

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 40	+0.35!	826.7M	8:46.31	g4! 
 40	+0.08?	778.6M	8:16.17	g4 Rg8? 
 40	+0.17?	762.5M	8:05.99	g4 Rg8? 
 40	+0.29!	751.0M	7:58.75	g4! 
 39	+0.23 	733.2M	7:47.66	g4 Rg8 Kh2 fxg4 Kg3 Bf3 a3 a6 a4 a5 Kh4 Qe7 Qxe7+ Kxe7 Rb1 Rb8 f5 gxf5 Bxf5 Rf8 Bd3 Rg8 Kg3 Rb8 Rb2 Ke6 Bxh7 Kxe5 Bd3 Kf6 Kf4 Bc6 Kxg4 Bxa4 Rb1 Bd7+ Kh5 Be8+ Kh4 a4 Rf1+ Ke7 h7 Bc6 Kh5 a3 Kg6 Kd6 Rf6+ Kc7 Rf7+ Bd7 
 39	+0.34!	711.7M	7:33.89	g4! 
 39	+0.21!	684.5M	7:16.64	g4! 
 39	+0.12!	671.7M	7:08.64	g4! 
 39	+0.06!	649.8M	6:55.22	g4! 
 38	  0.00 	530.7M	5:40.96	Rd1 Qe7 Qxe7+ Kxe7 Kf2 Ke6 g4 fxg4 Kg3 Bf3 Re1 Kd7 Rb1 Kc7 Ra1 Rb8 Re1 Kd7 Rg1 Rf8 

It's quite a bit faster when using all 12 cores with 23 threads, but it would take a quite a while to come up with a big score

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 31	+0.30!	623.1M	0:27.14	g4! 
 31	+0.24?	572.6M	0:24.90	g4 Rg8? 
 30	+0.30 	536.2M	0:23.28	g4 Rg8 Kf2 fxg4 Kg3 Bb7 a4 Bf3 Kh4 a6 Rb1 a5 f5 gxf5 Bxf5 Qe7 Qxe7+ Kxe7 Kg3 Rf8 Bd3 Rb8 Rb2 Ke6 Bxh7 Kxe5 Bd3 Kf6 Rb1 Rb7 Re1 Rb8 Kf4 Rh8 h7 
 30	+0.34!	526.2M	0:22.86	g4! 
 30	+0.21!	487.0M	0:21.12	g4! 
 30	+0.12!	462.4M	0:20.06	g4! 
 30	+0.06!	461.3M	0:20.01	g4! 
 29	  0.00 	192.5M	0:08.45	Be2 Be4 Bd3 Bb7 Qg3 Rd8 Kh2 Rg8 Be2 Be4 Bf3 Qc6 Rf1 Bxf3 Rxf3 Re8 Ra3 Re7 Qg5 Ke8 Kh3 Qe6 Qg3 Qc6 Qg5 
 28	  0.00 	172.0M	0:07.54	Be2 Be4 Bd3 Bb7 Qg3 Rd8 Kh2 Kf8 Qh4 Rd7 Be2 Re7 a3 Kf7 Qg5 Re8 Qg3 Qe7 Qh3 Kf8 Bd3 Qe6 Be2 
 27	  0.00 	151.6M	0:06.64	Be2 Be4 Bd3 Bb7 Be2 Be4 

this was using current dev-McCain, but you will have to compile yourself since X2a was just released a few days ago
https://github.com/MichaelB7/Stockfish/tree/McCain

X2a release downloads
https://github.com/MichaelB7/Stockfish/releases/tag/X2a
scroll down to see binaries of all flavors

[Paloma]

Hi MikeB,

Lukas Monge McC X2a DL is not X2a, is old X2

[Scally]

Hi Mike,

I compiled your latest code last Thursday, it’s McCain-X3-dev-040619 on my RPi.

Al.

[MikeGL]

[D]6r1/p4k1p/1p2q1pP/2p1P1Q1/2P2Pp1/2p2bK1/P1B5/4R3 b - - 1 33
...
<deleted>

love positions like this Mike - thx for sharing...

Current dev McCain will find g4 eventually in single core/thrread mode , but it does take quite a while.

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 40	+0.35!	826.7M	8:46.31	g4! 
 40	+0.08?	778.6M	8:16.17	g4 Rg8? 
 40	+0.17?	762.5M	8:05.99	g4 Rg8? 
 40	+0.29!	751.0M	7:58.75	g4! 
 39	+0.23 	733.2M	7:47.66	g4 Rg8 Kh2 fxg4 Kg3 Bf3 a3 a6 a4 a5 Kh4 Qe7 Qxe7+ Kxe7 Rb1 Rb8 f5 gxf5 Bxf5 Rf8 Bd3 Rg8 Kg3 Rb8 Rb2 Ke6 Bxh7 Kxe5 Bd3 Kf6 Kf4 Bc6 Kxg4 Bxa4 Rb1 Bd7+ Kh5 Be8+ Kh4 a4 Rf1+ Ke7 h7 Bc6 Kh5 a3 Kg6 Kd6 Rf6+ Kc7 Rf7+ Bd7 
 39	+0.34!	711.7M	7:33.89	g4! 
 39	+0.21!	684.5M	7:16.64	g4! 
 39	+0.12!	671.7M	7:08.64	g4! 
 39	+0.06!	649.8M	6:55.22	g4! 
 38	  0.00 	530.7M	5:40.96	Rd1 Qe7 Qxe7+ Kxe7 Kf2 Ke6 g4 fxg4 Kg3 Bf3 Re1 Kd7 Rb1 Kc7 Ra1 Rb8 Re1 Kd7 Rg1 Rf8 

It's quite a bit faster when using all 12 cores with 23 threads, but it would take a quite a while to come up with a big score

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 31	+0.30!	623.1M	0:27.14	g4! 
 31	+0.24?	572.6M	0:24.90	g4 Rg8? 
 30	+0.30 	536.2M	0:23.28	g4 Rg8 Kf2 fxg4 Kg3 Bb7 a4 Bf3 Kh4 a6 Rb1 a5 f5 gxf5 Bxf5 Qe7 Qxe7+ Kxe7 Kg3 Rf8 Bd3 Rb8 Rb2 Ke6 Bxh7 Kxe5 Bd3 Kf6 Rb1 Rb7 Re1 Rb8 Kf4 Rh8 h7 
 30	+0.34!	526.2M	0:22.86	g4! 
 30	+0.21!	487.0M	0:21.12	g4! 
 30	+0.12!	462.4M	0:20.06	g4! 
 30	+0.06!	461.3M	0:20.01	g4! 
 29	  0.00 	192.5M	0:08.45	Be2 Be4 Bd3 Bb7 Qg3 Rd8 Kh2 Rg8 Be2 Be4 Bf3 Qc6 Rf1 Bxf3 Rxf3 Re8 Ra3 Re7 Qg5 Ke8 Kh3 Qe6 Qg3 Qc6 Qg5 
 28	  0.00 	172.0M	0:07.54	Be2 Be4 Bd3 Bb7 Qg3 Rd8 Kh2 Kf8 Qh4 Rd7 Be2 Re7 a3 Kf7 Qg5 Re8 Qg3 Qe7 Qh3 Kf8 Bd3 Qe6 Be2 
 27	  0.00 	151.6M	0:06.64	Be2 Be4 Bd3 Bb7 Be2 Be4 

this was using current dev-McCain, but you will have to compile yourself since X2a was just released a few days ago
https://github.com/MichaelB7/Stockfish/tree/McCain

X2a release downloads
https://github.com/MichaelB7/Stockfish/releases/tag/X2a
scroll down to see binaries of all flavors

Thanks for your engine.
Looks like you have an above average hardware there.
I tried to analyze again with SF10 on my weak hardware, and the winning move was
actually 2 plies earlier. With 28.Qg5! of white forcing a win.

Tough 28.Qg5 positional win.
[D]5rk1/p6p/1pb1q1pP/2p1Pp2/2Pp1P2/3B2Q1/P1P3P1/4R1K1 w - - 1 28
Best move here would be 28.Qg5 as played in text forcing a win 1-0. All the replies of black after 28.Qg5 would lose after I analyzed with SF10 multi-pv.