Endgame that Stockfish DD does not evaluate correctly

[overlord]

[pgn][Event "Blitz 5m"]
[Site "?"]
[Date "2014.01.22"]
[Round "?"]
[White "Kvicala, Miroslav"]
[Black "Stockfish DD"]
[Result "1/2-1/2"]
[ECO "C41"]
[PlyCount "88"]

1. e4 e5 2. Nf3 d6 3. c3 Nf6 4. d3 c5 5. Be2 Be7 6. O-O O-O 7. c4 Nc6 8. Nc3
Nd4 9. h3 a6 10. a4 Bd7 11. Bd2 Re8 12. Nxd4 exd4 13. Nd5 Nxd5 14. exd5 b5 15.
axb5 axb5 16. b3 Rxa1 17. Qxa1 Bg5 18. Qd1 b4 19. Re1 Bxd2 20. Qxd2 Qe7 21. Kf1
Ra8 22. Qb2 Qg5 23. Ra1 Rxa1+ 24. Qxa1 h5 25. Qd1 h4 26. Qe1 Bf5 27. Qd1 Qg6
28. Qd2 f6 29. Qd1 Qg5 30. Qe1 Qf4 31. Kg1 Kf7 32. Qd1 Bd7 33. Bf3 f5 34. Qe2
g5 35. Bh5+ Kf8 36. Qf3 Qxf3 37. Bxf3 Ke7 38. g3 g4 39. hxg4 fxg4 40. Bd1 h3
41. Kh2 Bf5 42. Be2 Kf7 43. Bf1 Kf6 44. Be2 Bg6 1/2-1/2[/pgn][/url]

[overlord]

Final position is dead draw (game ended by 50 moves rule), however Stockfish DD evaluates position as won for black -1.70... (due to passed h2 pawn).

[arjuntemurnikar]

This reminds me of the king shelter rule that was changed recently. I wonder if it also benefits endgames.

... It seems the latest SF still suffers from the syndrome! So the adhoc "king shelter" patch seems to not work in the endgame.

Analysis with the new Stockfish Chess app for Mac
Stockfish 190114

Code: Select all

1... Bf5 2. Be2 Kf6 3. Bf1 Bg6 4. Be2 Kg5 5. Bf1 Bf5 6. Be2 Bh7 7. Bf1 Bg6 8. Be2 Bh5 9. Bd1 Kf5 10. Be2 Ke5 11. Bd1 Bg6 12. Be2 Kf6 13. Bf1 Kf5 14. Be2 Ke5 15. Kh1 Bh5 16. Kh2 Kf5 17. Bd1 Kf6 18. Be2 Ke7 19. Kh1 Kf7 20. Kh2 Kf6 21. Bd1 Kg5 22. Be2 Kf5 
    - (1.36)    Depth: 58/70    0:00:33    66 MN

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish PA_GTB DD 64:

45.Kh1 Kg5 46.Kg1 Bf5 47.Kh2 Kf6 48.Kh1 Bh7 49.Kh2 Kg5 50.Kg1 Kh6 51.Kh2 Bf5 52.Kg1 Kg7 53.Kh1 Kg6 54.Kg1 Kh6 55.Kh2 Bd7 56.Bd1 Bc8 57.Be2 Kg5 58.Bd1 Kg6 59.Be2 Bd7 60.Kg1 Kf6 61.Bd1 Bf5 62.Be2 Bc8 63.Kh2 Kg6 64.Bf1 Bf5 65.Be2 Kg5 66.Bf1 Bd7 67.Be2 Kh6 68.Bd1 Bc8 69.Be2 Kg5 70.Bd1 Kg6 71.Be2 Bd7 72.Kg1 Kf6 73.Bd1 Bf5 74.Be2 Bc8 75.Kh2 Kg6 76.Bf1 Bf5 77.Be2 Kg5 78.Bf1 Bd7 79.Be2 Kh6
-+ (-1.66) Depth: 51/61 00:00:29 88781kN, tb=1197
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish PA_GTB DD 64:

45.Kh1 Kg5 46.Kg1 Bf5 47.Kh2 Kf6 48.Kh1 Bh7 49.Kh2 Kg5 50.Kg1 Kh6 51.Kh2 Bf5 52.Kg1 Kg7 53.Kh1 Kg6 54.Kg1 Kh6 55.Kh2 Bd7 56.Bd1 Bc8 57.Be2 Kg5 58.Bd1 Kg6 59.Be2 Bd7 60.Bd1 Kh6 61.Be2 Bf5 62.Kg1 Kg7 63.Kh1 Kg6 64.Kg1 Kh6 65.Kh2 Bd7 66.Bd1 Bc8 67.Be2 Kg5 68.Bd1 Kg6 69.Be2 Bd7 70.Bd1 Kh6 71.Be2 Bf5
-+ (-1.66) Depth: 54/61 00:01:03 183MN, tb=4330
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish PA_GTB DD 64:

45.Kh1 Kg5 46.Kg1 Bf5 47.Kh2 Kf6 48.Kh1 Bh7 49.Kh2 Kg5 50.Kg1 Bg6 51.Kh2 Kf5 52.Bd1 Kf6 53.Be2 Ke5 54.Bf1 Bh5 55.Be2 Kf6 56.Bd1 Kg5 57.Be2 Bf7 58.Bd1 Be8 59.Be2 Bd7 60.Bd1 Kh5 61.Be2 Kg6 62.Kg1 Kg5 63.Kh2 Kh6 64.Bd1 Bc8 65.Be2 Kg5 66.Bd1 Kg6 67.Be2 Bd7 68.Kg1 Kg5 69.Kh2 Kh6 70.Bd1 Bc8 71.Be2 Kg5 72.Bd1 Kg6 73.Be2 Bd7
-+ (-1.66) Depth: 59/61 00:02:36 427MN, tb=21161
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish PA_GTB DD 64:

45.Kh1 Kg5 46.Kg1 Bf5 47.Kh2 Kf6 48.Kh1 Bh7 49.Kh2 Kg5 50.Kg1 Bg6 51.Kh2 Kf5 52.Bd1 Kf6 53.Be2 Ke5 54.Bf1 Bh5 55.Be2 Kf6 56.Bd1 Kg5 57.Be2 Bf7 58.Bd1 Be8 59.Be2 Bd7 60.Kg1 Kg6 61.Kh2 Kh6 62.Bd1 Bc8 63.Be2 Kg5 64.Bf1 Kg6 65.Be2 Bd7 66.Kg1 Kg5 67.Kh2 Kf6 68.Bd1 Kg7 69.Kg1 Kh6 70.Kh2 Bc8 71.Be2 Kg5 72.Bf1 Kg6 73.Be2 Bd7 74.Kg1 Kg5 75.Kh2 Kf6 76.Bd1 Kg7 77.Kg1 Kh6 78.Kh2
-+ (-1.66) Depth: 62/64 00:03:04 497MN, tb=27046
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish PA_GTB DD 64:

45.Kh1 Kg5 46.Kg1 Bf5 47.Kh2 Kf6 48.Kh1 Bh7 49.Kh2 Kg5 50.Kg1 Bg6 51.Kh2 Kf5 52.Bd1 Kf6 53.Be2 Ke5 54.Bf1 Bh5 55.Be2 Kf6 56.Bd1 Kg5 57.Be2 Be8 58.Kh1 Kf5 59.Kg1 Bd7 60.Kh2 Kg5 61.Bd1 Kh5 62.Be2 Bf5 63.Bf1 Bc8 64.Be2 Kg6 65.Kg1 Bd7 66.Kh2 Kf6 67.Bd1 Kg7 68.Kg1 Kh6 69.Kh2 Bc8 70.Be2 Kg5 71.Kh1 Bd7 72.Kh2 Kg6 73.Kg1 Kf5 74.Kh2 Kg5 75.Bd1 Kh5 76.Be2 Bf5 77.Bf1 Bc8 78.Be2 Kg6 79.Kg1 Bd7 80.Kh2 Kf6 81.Bd1 Kg7 82.Kg1 Kh6 83.Kh2 Bc8 84.Be2 Kg5 85.Kh1 Bd7 86.Kh2 Kg6 87.Kg1 Kf5
-+ (-1.66) Depth: 67/76 00:04:33 735MN, tb=40059
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish 070114 64:

45.Kg1 Kg5 46.Kh2 Bh5 47.Bf1 Kf5 48.Be2 Ke5 49.Bd1 Bg6 50.Be2 Bf5 51.Kg1 Bh7 52.Kh2 Kf6 53.Kh1 Kf5 54.Kg1 Kg5 55.Kh2 Bf5 56.Bf1 Kg6 57.Be2 Kh6 58.Kh1 Kg5 59.Kh2 Kg6 60.Kh1 Kh6 61.Kg1 Bd7 62.Kh2 Kg5 63.Bd1 Kf6 64.Be2 Kf5 65.Bd1 Kg6 66.Be2 Kf6 67.Bd1 Kf5 68.Be2 Kg5
-+ (-1.65) Depth: 66/67 00:06:02 1275MN
(Chess Engines Testing, 22.01.2014)

[beachknight]

15:
8/8/3p1kb1/2pP4/1pPp2p1/1P1P2Pp/4BP1K/8 w - - 0 1

Analysis by Stockfish 180114IP 64:

45.Kg1 Ke5 46.Kh2 Bh5 47.Kg1 Kf5 48.Kh2 Kf6 49.Kh1 Kg5 50.Kh2 Kf5 51.Kh1 Kf6 52.Kg1 Bg6 53.Kh2 Bf5 54.Bf1 Kg5 55.Kh1 Bd7 56.Be2 Be8 57.Kg1 Kf5 58.Kf1 Bh5 59.Kg1 Bg6 60.Kh2 Ke5 61.Bf1 Be8 62.Be2 Bh5
=/+ (-0.70) Depth: 49/53 00:00:14 45343kN
(Chess Engines Testing, 22.01.2014)