Lesson 1:Terry McCracken wrote: It's good you will evaluate it. There's always something to learn. The Endgame is very much a fertile ground of research for GM/s and for programmers of GM engines.
Stockfish needs 14 depths to breake a bonus for passed pawns in this simple position.
[d]8/8/8/8/4k3/7p/3PK2P/8 w - - 0 1
Code: Select all
Stockfish-222-32-ja:
1/2 00:01 16 12 +0,88 d2d3+ Ke4d4
2/4 00:01 67 51 +0,76 d2d3+ Ke4d4 Ke2d2
3/4 00:01 133 101 +0,88 d2d3+ Ke4d4 Ke2d2 Kd4d5
4/6 00:01 351 267 +0,92 d2d3+ Ke4d4 Ke2d2 Kd4d5 Kd2e3
5/7 00:01 875 658 +1,13 d2d3+ Ke4d4 Ke2d2 Kd4d5 Kd2e3 Kd5e5 d3d4+ Ke5d5
6/8 00:01 1.352 1.018 +1,13 d2d3+ Ke4d4 Ke2d2 Kd4d5 Kd2e3 Kd5e5 d3d4+ Ke5d5
7/10 00:01 2.962 2.230 +1,41 d2d3+ Ke4d4 Ke2d2 Kd4d5 Kd2e3 Kd5e5 d3d4+ Ke5d5 Ke3d3 Kd5e6
8/13 00:01 4.623 3.481 +1,57 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d6 Ke4e3
9/14 00:01 7.981 5.938 +1,77 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d7 Ke4e5 Kd7e7 Ke5e4 Ke7e6 Ke4e3 Ke6d6 Ke3e4 Kd6e6
10/14 00:01 13.053 9.712 +2,18 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d7 Ke4e5 Kd7e7 d4d5 Ke7d7
11/14 00:01 14.445 10.621 +2,18 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d7 Ke4e5 Kd7e7 d4d5 Ke7d7
12/19 00:01 29.183 21.224 +2,82 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d7 Ke4e5 Kd7e7 d4d5 Ke7d7 d5d6 Kd7d8 Ke5e6 Kd8e8 Ke6e5
13/19 00:01 33.683 24.496 +2,82 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 d3d4 Kf5e6 Ke3e4 Ke6d7 Ke4e5 Kd7e7 d4d5 Ke7d7 d5d6 Kd7d8 Ke5e6 Kd8e8 Ke6e5
14/23 00:01 61.564 43.786 +3,27 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 Ke3f3 Kf5e6 Kf3g4 Ke6e5 Kg4xh3 Ke5f4 d3d4 Kf4e4 Kh3g3 Ke4f5 h2h4 Kf5f6 h4h5 Kf6g5 Kg3f3
15/28 00:01 111.337 76.625 +5,05 Ke2f2 Ke4f4 d2d3 Kf4g4 Kf2e3 Kg4f5 Ke3f3 Kf5e6 Kf3g4 Ke6e5 Kg4xh3 Ke5f4 d3d4 Kf4e4 Kh3g3 Ke4f5 h2h4 Kf5f6 h4h5 Kf6g7 d4d5 Kg7f7 h5h6 Kf7g6 d5d6
It is good, if it starts from root. Imagine, problems on much higher ply.
Lesson 2:
It is possible to get this possition on a very high ply. It needs 20 additional depths to verify that it is a wrong choise.
[d] 8/8/4k3/8/3PK3/7p/7P/8 w - - 0 1
Code: Select all
Stockfish-222-32-ja:
1/2 00:00 14 22 +1,53 d4d5+ Ke6d6
2/3 00:00 50 80 +1,41 d4d5+ Ke6d6 Ke4d4
3/4 00:00 134 214 +2,06 d4d5+ Ke6d6 Ke4d4 Kd6d7
4/6 00:00 377 603 +1,97 d4d5+ Ke6d7 Ke4e5 Kd7e7 Ke5e4
5/6 00:00 682 1.091 +1,93 d4d5+ Ke6d7 Ke4d4 Kd7d6 Kd4e4 Kd6c5
6/9 00:00 1.916 2.989 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6e7 Kd4e5 Ke7d7 d5d6 Kd7c6 Ke5e6
7/10 00:00 2.325 3.627 +2,90 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e5 Kd8d7
8/12 00:00 2.865 4.367 +2,94 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e6 Kd8e8
9/13 00:00 3.634 5.539 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e6 Kd8e8 Ke6e5 Ke8d7
10/16 00:00 6.117 9.324 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e4 Kd8e8 Ke4d4 Ke8d7 Kd4e5 Kd7c6 Ke5e6
11/16 00:00 6.558 9.758 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e4 Kd8e8 Ke4d4 Ke8d7 Kd4e5 Kd7c6 Ke5e6
12/16 00:00 8.601 12.799 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e4 Kd8e8 Ke4d4 Ke8d7 Kd4e5 Kd7d8 Ke5d5 Kd8d7 Kd5c5 Kd7d8 Kc5d4 Kd8e8 Kd4e4 Ke8d7 Ke4e5
13/16 00:00 10.599 15.772 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e4 Kd8e8 Ke4d5 Ke8d8
14/20 00:00 16.496 24.547 +2,86 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5c6 Kd8c8 Kc6d5 Kc8d7 Kd5c5 Kd7d8 Kc5c6
15/22 00:00 22.711 33.010 +2,74 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5c6 Kd8c8 Kc6b6 Kc8d8 Kb6b5 Kd8d7 Kb5c5 Kd7d8 Kc5d4 Kd8e8 Kd4c4 Ke8d8 Kc4b5
16/22 00:00 28.888 41.988 +2,74 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e6 Kd8e8 Ke6d5 Ke8d7 Kd5c5 Kd7d8 Kc5c6 Kd8c8 Kc6b6 Kc8d8 Kb6b5 Kd8d7 Kb5c5
17/24 00:00 37.824 53.803 +2,74 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5c6 Kd8c8 Kc6b5 Kc8d7 Kb5c5 Kd7d8 Kc5c6
18/24 00:00 44.169 62.829 +2,74 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5c6 Kd8c8 Kc6b5 Kc8d7 Kb5c5 Kd7d8 Kc5c6
19/24 00:00 56.893 79.127 +2,74 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5c6 Kd8c8 Kc6b5 Kc8d7 Kb5c5 Kd7d8 Kc5d4 Kd8e8 Kd4c4 Ke8d8 Kc4d5 Kd8d7 Kd5e5 Kd7d8 Ke5d4
20/28 00:00 183.986 226.305 +1,69 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 Ke5f5 Ke7d7 Kf5e5
21/28 00:00 417.863 445.482 0,00 d4d5+ Ke6d6 Ke4d4 Kd6d7 Kd4e5 Kd7e7 d5d6+ Ke7d7 Ke5d5 Kd7d8 Kd5e4 Kd8d7 Ke4e5 Kd7d8 Ke5d5 Kd8d7 Kd5c5 Kd7d8 Kc5c4 Kd8e8 Kc4d4 Ke8d8 Kd4d5