Matthies / RubiChess

Another chess engine
GNU General Public License v3.0
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Rubi showing wrong winning eval +10 in a drawn endgame #465

Open Matthies opened 2 months ago

Matthies commented 2 months ago

cutechess.debug.log https://www.chess.com/computer-chess-championship#event=ccc22-bullet-main&game=400

Rubi shows +10 after Leela's 79. .. Bd8 up to move 116. Local reproduction possible with 16 threads and 6-men TB booming to 4.5. PGN:

[Event "CCC22 Bullet: Main (1|1)"]
[Site "?"]
[Date "2024.05.11"]
[Round "1"]
[White "Rubi"]
[Black "Lc0"]
[Result "1/2-1/2"]
[ECO "B04"]
[GameDuration "00:07:07"]
[GameEndTime "2024-05-11T07:12:08.252 PDT"]
[GameStartTime "2024-05-11T07:05:00.379 PDT"]
[Opening "Alekhine's defense"]
[PlyCount "241"]
[TimeControl "60+1"]
[Variation "Modern, Fianchetto Variation"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 5. Bc4 Nb6 6. Bb3 Bg7 7. Qe2 O-O 8. O-O
dxe5 9. dxe5 Nc6 10. Rd1 Qe8 11. h3 Bf5 12. a4 Rd8 13. Rxd8 Qxd8 14. Nc3 a5 15.
Be3 Qc8 16. Bxb6 cxb6 17. Nd5 Be6 18. c4 h6 19. Re1 Rd8 20. Nxb6 Qb8 21. Nd5 Qc8
22. Qe3 Qd7 23. Qb6 Kh7 24. Nf4 Rf8 25. Kf1 Qc8 26. Nxe6 Qxe6 27. c5 Qf5 28.
Qxb7 Nxe5 29. Nxe5 Bxe5 30. Qd5 Bf6 31. c6 e6 32. Qxf5 gxf5 33. Bc4 Rc8 34. Bb5
Bxb2 35. Rd1 Kg7 36. Ke2 Kf6 37. Rd7 Be5 38. g3 Bb8 39. f4 e5 40. Kf3 exf4 41.
gxf4 Rc7 42. Rd6+ Kg7 43. Rd5 Kf6 44. Rd6+ Kg7 45. Rd5 Kf6 46. Rd8 Ba7 47. Re8
Bb6 48. Rh8 Kg7 49. Rb8 Ba7 50. Re8 Kf6 51. h4 Bb6 52. Rb8 Ba7 53. Re8 Bb6 54.
Rh8 Kg7 55. Rb8 Ba7 56. Re8 Kf6 57. h5 Bb6 58. Rh8 Kg7 59. Re8 Kf6 60. Rh8 Kg7
61. Rb8 Ba7 62. Ra8 Re7 63. Ba6 Bb6 64. Rb8 Re3+ 65. Kg2 Bc7 66. Rb7 Re7 67. Kf3
Kf6 68. Bd3 Ke6 69. Rb5 Re8 70. Bxf5+ Ke7 71. Ke3 Rb8 72. Rd5 Rd8 73. Rxd8 Kxd8
74. Be4 Ke7 75. f5 f6 76. Kd3 Kd6 77. Kc4 Bd8 78. Kb5 Bc7 79. Ka6 Bd8 80. Kb7
Bc7 81. Bd3 Bd8 82. Ba6 Bc7 83. Bc4 Bd8 84. Bf1 Bc7 85. Be2 Bd8 86. Bb5 Bc7 87.
Bc4 Bd8 88. Bb3 Bc7 89. Bg8 Bd8 90. Ba2 Bc7 91. Bd5 Bd8 92. Bf3 Bc7 93. Bd5 Bd8
94. Bg2 Bc7 95. Bh1 Bd8 96. Bg2 Bc7 97. Bh1 Bd8 98. Bf3 Bc7 99. Bg2 Bd8 100. Bh3
Bc7 101. Bg2 Bd8 102. Bh3 Bc7 103. Bf1 Bd8 104. Be2 Bc7 105. Bg4 Bd8 106. Be2
Bc7 107. Bf1 Bd8 108. Ba6 Bc7 109. Bd3 Bd8 110. Bb1 Bc7 111. Bc2 Bd8 112. Bb3
Bc7 113. Bd1 Bd8 114. Bg4 Bc7 115. Be2 Bd8 116. Bd1 Bc7 117. Bb3 Bd8 118. Bc2
Bc7 119. Bb3 Bd8 120. Bd1 Bc7 121. Bb3 1/2-1/2