The following position occured in the game Dominguez Perez - Michiels (2010):
[d]6k1/1p3pp1/p6p/7P/3Q2P1/5P2/PPPK4/5q2 b - - 2 35
For humans it is intuitively clear that the pawn ending after 35....Qxf3 36.Qd8+ Kh7 37.Qd3+ should be winning for white: a centralized king and a pawn majority at the queen side.
However, Stockfish 8 thinks 35....Qxf3 is the best move for black, only at a high depth, it prefers 35....Qg2+.
After 35....Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3, both recaptures win for white.
[d]8/1p3ppk/p6p/7P/6P1/3q4/PPPK4/8 w - - 0 38
Curiously, even in this position, Stockfish 8 needs a high depth to realize that 38.Kxd3 wins.
Just wanted to share this position!
Queen and pawn endgame
Moderators: hgm, Rebel, chrisw
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Rodolfo Leoni
- Posts: 545
- Joined: Tue Jun 06, 2017 4:49 pm
- Location: Italy
Re: Queen and pawn endgame
Thanks for sharing. 
You are right. Engines takes some time to see W wins. I tried with AsmFish, and its choice is 38.cxd3, but after a while.
You are right. Engines takes some time to see W wins. I tried with AsmFish, and its choice is 38.cxd3, but after a while.
Code: Select all
FEN: 8/1p3ppk/p6p/7P/6P1/3q4/PPPK4/8 w - - 0 38
AsmFishW_2017-07-10_popcnt:
8/8 00:00 27k 6,722k +0.44 38.Kxd3 g6 39.Kd4 Kg7 40.Kc5 Kf6 41.Kb6 Kg5 42.hxg6
9/11 00:00 53k 8,803k +0.34 38.cxd3 Kg8 39.Ke3 Kf8 40.Kd4 Ke7 41.Kc5 Ke6 42.d4
10/11 00:00 70k 8,805k +0.36 38.Kxd3 g6 39.Ke4 Kg7 40.Ke5 f5 41.gxf5 gxh5 42.b4 h4
11/17 00:00 196k 10,315k +0.16 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.b3 b5 44.b4 f5+ 45.Kf4
12/17 00:00 242k 10,509k +0.08 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.b3 Kd6 44.b4 Ke6 45.a4
13/17 00:00 284k 10,941k +0.11 38.cxd3 g6 39.d4 Kg7 40.Kd3 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.a3 b5 44.b4 Kd6
14/17 00:00 311k 11,100k +0.11 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 Ke6 42.a3 a5 43.g5 hxg5 44.h6 f5+ 45.Kf3
15/20 00:00 431k 11,648k +0.11 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.d5+ Kd6 44.a3 a5 45.a4 b6 46.b3 f6 47.Kf5 Kxd5
16/23 00:00 457k 11,710k +0.17 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.d5+ Kd6 44.a3 b6 45.b3 a5 46.a4 f6 47.Kf5 Kxd5 48.Kxf6 Kc5 49.Kg6
17/23 00:00 707k 11,042k +0.19 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.a3 a5 44.d5+ Kd6 45.a4 f6 46.Kf5 Kxd5 47.Kxf6 Ke4 48.Kg7
18/29 00:00 834k 10,688k +0.24 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 Ke6 43.d5+ Kd6 44.a3 b6 45.b3 b5 46.b4 f6 47.Kf5 Kxd5 48.Kg6 Ke6 49.Kxh6 Kf5 50.Kh7 Kg5 51.h6
19/29 00:00 2,342k 9,924k +0.39 38.cxd3 g6 39.Ke3 Kg7 40.d4 Kf6 41.Ke4 gxh5 42.gxh5 a5 43.d5 a4 44.Kf4 b5 45.a3 Ke7 46.Ke5 Kd7 47.Kf6 Kd6 48.Kxf7
20/29 00:00 4,053k 10,007k +0.40 38.cxd3 Kg8 39.Ke3 Kf8 40.Kd4 Ke7 41.Ke5 Kd7 42.Kd5 Kc7 43.b4 b6 44.d4 Kd7 45.a3 a5 46.bxa5 bxa5 47.a4 Ke7
21/29 00:00 4,594k 10,053k +0.43 38.cxd3 Kg8 39.Ke3 Kf8 40.Kf4 Ke7 41.Ke5 Kd7 42.Kd5 Kc7 43.b4 b6 44.d4 Kd7 45.a3 Kc7 46.a4 Kd7 47.Ke5 Kc6 48.d5+ Kd7 49.a5
22/29 00:00 5,683k 10,166k +0.43 38.cxd3 Kg8 39.Ke3 Kf8 40.Kf4 Ke7 41.Ke5 Kd7 42.Kd5 b6 43.d4 Kc7 44.b4 Kd7 45.a3 Kc7 46.a4 Kd7 47.Ke5 Kc6 48.d5+ Kd7 49.a5 f6+ 50.Kf5 bxa5
23/35 00:01 19,597k 10,320k +0.75 38.cxd3 Kg8 39.Ke3 a5 40.a4 Kf8 41.d4 Ke7 42.d5 Kd7 43.Kd3 Kd6 44.Kd4 Ke7 45.Kc5 Kd7 46.b3 g5 47.Kd4 Kd6 48.Ke4 Kc5 49.Ke5 b6 50.Ke4
24/38 00:02 20,934k 10,333k +0.79 38.cxd3 Kg8 39.Ke3 a5 40.a4 Kf8 41.d4 Ke7 42.d5 Kd7 43.Kd4 Kd6 44.b3 Kd7 45.Kc5 g5 46.Kd4 Kd6 47.Ke4 Kc5 48.Ke5 b6 49.Ke4 Kd6 50.Kd4 Kd7 51.Ke5
25/38 00:02 24,619k 10,314k +0.79 38.cxd3 Kg8 39.Ke3 a5 40.Ke4 Kf8 41.a4 Ke7 42.Ke5 Kd7 43.Kd5 Ke7 44.d4 Kd7 45.Ke4 Kd6 46.d5 Kc7 47.Kd4 Kd6 48.b3 Kd7 49.Kc5 g5 50.Kd4 Kd6 51.Ke4 Kd7
26/38 00:02 27,516k 10,313k +0.79 38.cxd3 Kg8 39.Ke3 a5 40.a4 Kf8 41.d4 Ke7 42.d5 Kd7 43.Kd3 Kd6 44.Kd4 Ke7 45.Kc5 Kd7 46.b3 g5 47.Kd4 Kd6 48.Ke4 Kd7 49.Ke5 Ke7 50.d6+ Kd7 51.Kf6 Kxd6 52.Kg7 Ke5 53.Kxh6 Kf4
27/38+ 00:03 33,836k 10,421k +0.93 38.cxd3
27/38- 00:03 38,594k 10,389k +0.86 38.cxd3 Kg8
27/38- 00:04 43,679k 10,455k +0.50 38.cxd3 Kg8
27/52+ 00:05 58,298k 10,392k +0.66 38.cxd3
27/52 00:05 60,282k 10,399k +0.77 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 a5 43.Kc5 a4 44.b3 a3 45.b4 Kc7 46.d4 b6+ 47.Kb5 g5 48.d5 Kd6 49.Kxb6 Kxd5 50.b5 f5 51.gxf5 g4
28/52+ 00:06 62,495k 10,393k +0.84 38.cxd3
28/52- 00:06 66,920k 10,377k +0.77 38.cxd3 Kg8
28/52+ 00:06 70,139k 10,389k +0.84 38.cxd3
28/52- 00:07 77,538k 10,373k +0.75 38.cxd3 Kg8
28/52 00:07 81,520k 10,405k +0.68 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 a5 43.Kc5 a4 44.b4 axb3 45.axb3 Kc7 46.b4 b6+ 47.Kd5 Kd7 48.d4 Kc7 49.Kc4 Kd6 50.d5 Kc7 51.Kb5 Kb7 52.d6 g5 53.hxg6 fxg6 54.g5
29/52- 00:10 113,077k 10,390k +0.61 38.cxd3 Kg8
29/52+ 00:11 114,741k 10,389k +0.75 38.cxd3
29/52 00:11 124,353k 10,378k +0.82 38.cxd3 Kg8 39.Ke3 a5 40.Kd4 Kf8 41.Kc5 Ke7 42.d4 Kd7 43.d5 a4 44.b3 axb3 45.axb3 Kc7 46.d6+ Kd7 47.Kd5 Ke8 48.Kc4 Kd8 49.Kb5 Ke8 50.Kb6 Kd7 51.Kc5 Ke6 52.b4 Kd7 53.b5 Ke6 54.Kb6 Kxd6 55.Kxb7
30/52+ 00:12 132,440k 10,369k +0.89 38.cxd3
30/52+ 00:13 140,940k 10,369k +0.97 38.cxd3
30/52+ 00:17 184,067k 10,429k +1.44 38.cxd3
30/52 00:20 211,801k 10,484k +1.66 38.cxd3 Kg8 39.d4 Kf8 40.Kd3 a5 41.Kc4 Ke7 42.Kc5 Kd7 43.d5 a4 44.b4 axb3 45.axb3 Kc7 46.d6+ Kd7 47.Kd5 Kd8 48.Kd4 Ke8 49.Kc4 Kd8 50.Kb5 Ke8 51.Kb6 Kd7 52.Kc5 Ke6 53.b4 Kd7 54.b5 g5 55.Kd5 Kc8 56.Ke5 Kd7 57.Kf6 Kxd6 58.Kxf7 Ke5 59.Kg6 Ke4 60.Kxh6 Kf4 61.Kh7
31/52 00:22 234,353k 10,529k +1.66 38.cxd3 Kg8 39.Ke3 a5 40.Kd4 Kf8 41.Kc5 Ke7 42.d4 Kd7 43.d5 a4 44.b4 axb3 45.axb3 Kc7 46.d6+ Kd7 47.Kd5 Kd8 48.Kd4 Ke8 49.Kc4 Kd8 50.Kb5 Kc8 51.Kb6 Kd7 52.Kc5 Ke8 53.b4 g5 54.Kd5 Kd8 55.Ke4 Kc8 56.Kf5 Kd7 57.Ke5 Kc6 58.b5+ Kd7
32/52+ 00:22 237,238k 10,538k +1.73 38.cxd3
32/52+ 00:23 244,490k 10,562k +1.80 38.cxd3
32/54+ 00:23 251,633k 10,584k +1.91 38.cxd3
32/54- 00:25 266,851k 10,595k +1.82 38.cxd3 Kg8
32/54- 00:26 280,438k 10,568k +1.61 38.cxd3 Kg8
32/54+ 00:27 290,741k 10,559k +1.77 38.cxd3
32/54 00:28 297,788k 10,554k +1.87 38.cxd3 Kg8 39.d4 Kf8 40.b4 Ke7 41.Ke3 Kd7 42.Ke4 Kd6 43.d5 Kc7 44.Ke5 Kd7 45.Kd4 Kd6 46.Kc4 b6 47.Kd4 Ke7 48.a4 Kd6 49.Kc4 Kd7 50.a5 Kc7 51.Kd4 bxa5 52.bxa5 Kd6 53.Ke4 Ke7 54.Kd3 Kd6 55.Kd4 g5 56.Ke4 f6 57.Kd4 Ke7 58.Kd3
33/54- 00:28 300,274k 10,549k +1.79 38.cxd3 Kg8
33/54+ 00:28 304,922k 10,550k +1.87 38.cxd3
33/54- 00:28 305,002k 10,550k +1.78 38.cxd3 Kg8
33/54 00:30 319,875k 10,529k +1.87 38.cxd3 Kg8 39.Ke3 Kf8 40.b4 Ke7 41.d4 Kd7 42.Ke4 Kd6 43.d5 Kc7 44.Kd4 b6 45.Kc4 Kd6 46.a4 Kd7 47.a5 Kc7 48.Kd4 bxa5 49.bxa5 Kd6 50.Ke4 Ke7 51.Kd3 Kd6 52.Kd4 g5 53.Ke4 Kd7 54.Kf5 Kd6 55.Kf6 Kxd5 56.Kxf7
34/54- 00:30 320,675k 10,528k +1.79 38.cxd3 Kg8
34/54- 00:30 321,726k 10,525k +1.72 38.cxd3 Kg8
34/54- 00:30 325,069k 10,521k +1.61 38.cxd3 Kg8
34/54+ 00:32 336,378k 10,500k +1.70 38.cxd3
34/54+ 00:33 351,681k 10,488k +1.91 38.cxd3
34/54 00:35 371,447k 10,447k +1.78 38.cxd3 Kg8 39.d4 Kf8 40.Kd3 Ke7 41.b4 Kd6 42.Ke4 b6 43.d5 Ke7 44.Ke5 Kd7 45.Kd4 Kd6 46.a4 Kc7 47.a5 bxa5 48.bxa5 Kd6 49.Kc4 Ke7 50.Kc5 Kd7 51.Kb6 g5 52.Kxa6 f5 53.gxf5 g4 54.f6 g3 55.f7 Ke7 56.d6+ Kxf7 57.Kb7 Ke6 58.Kc6 g2 59.d7 g1Q 60.d8Q Qg2+ 61.Kc7 Qh2+ 62.Kb7 Qxh5
35/54+ 00:36 380,040k 10,433k +1.85 38.cxd3
35/54+ 00:37 393,403k 10,401k +1.92 38.cxd3
35/71+ 00:53 557,712k 10,343k +2.39 38.cxd3
35/71 01:04 668,902k 10,418k +2.64 38.cxd3 Kg8 39.d4 Kf8 40.Kd3 Ke7 41.b4 Kd6 42.Ke4 Kc6 43.Ke5 b6 44.a4 Kd7 45.a5 bxa5 46.bxa5 Kc7 47.Kd5 Kd7 48.Kc5 Kc7 49.d5 Kd7 50.Kb6 g5 51.Kxa6 f5 52.gxf5 g4 53.f6 g3 54.f7 Ke7 55.Kb7 Kxf7 56.d6 Ke6 57.Kc7 g2 58.d7 g1Q
36/71- 01:04 670,186k 10,417k +2.49 38.cxd3 Kg8
36/71- 01:04 670,827k 10,416k +2.41 38.cxd3 Kg8
36/71- 01:05 678,495k 10,409k +2.31 38.cxd3 Kg8
36/71+ 01:08 706,099k 10,384k +2.41 38.cxd3
36/71+ 01:09 717,594k 10,378k +2.62 38.cxd3
36/71- 01:11 745,027k 10,390k +2.45 38.cxd3 Kg8
36/71+ 01:12 757,240k 10,379k +2.68 38.cxd3
36/71+ 01:29 929,623k 10,414k +3.16 38.cxd3
36/71 01:50 1,153,303k 10,434k +3.61 38.cxd3 Kg8 39.Ke3 a5 40.Kd4 Kf8 41.Kc5 Ke7 42.d4 Kd7 43.d5 a4 44.b4 axb3 45.axb3 Ke7 46.d6+ Kd7 47.Kd5 Kd8 48.Kd4 Kc8 49.Kc4 Kd8 50.Kb5 Kd7 51.Kc5 Ke6 52.b4 Kd7 53.b5 Kc8 54.Kb6 g5 55.Kc5 Kd7 56.Kd5 f6 57.b6 f5 58.gxf5 g4 59.f6 g3 60.f7 g2 61.f8Q g1Q
37/71+ 01:56 1,217,790k 10,455k +3.68 38.cxd3
37/71+ 01:59 1,253,838k 10,457k +3.76 38.cxd3
37/71+ 02:02 1,280,301k 10,455k +3.87 38.cxd3
37/71- 02:08 1,339,880k 10,456k +3.66 38.cxd3 Kg8
37/71+ 02:08 1,342,325k 10,455k +3.89 38.cxd3
37/71- 02:11 1,370,722k 10,463k +3.67 38.cxd3 Kg8
37/71+ 02:11 1,378,851k 10,464k +3.92 38.cxd3
37/71+ 02:30 1,578,091k 10,476k +4.41 38.cxd3
37/71 03:06 1,936,176k 10,374k +5.03 38.cxd3 Kg8 39.d4 Kf8 40.Kd3 Ke7 41.b4 Kf8 42.Ke4 Ke8 43.a4 Ke7 44.Kd5 Kd7 45.Kc5 Kc7 46.d5 b6+ 47.Kd4 Kd6 48.Kc4 Kd7 49.a5 Kc7 50.Kd4 Kb7 51.Ke4 bxa5 52.bxa5 Kc7 53.Ke3 Kd6 54.Kd4 Kd7 55.Kc5 g5 56.Kc4 Kc8 57.Kd4
38/71+ 03:19 2,057,793k 10,317k +5.10 38.cxd3
38/71+ 03:22 2,084,181k 10,303k +5.17 38.cxd3
38/71- 03:22 2,084,920k 10,302k +5.03 38.cxd3 Kg8
38/71- 03:22 2,089,014k 10,299k +4.33 38.cxd3 Kg8
38/71+ 03:24 2,103,324k 10,290k +5.03 38.cxd3
38/71+ 03:25 2,117,273k 10,282k +5.31 38.cxd3
38/71 03:31 2,171,131k 10,250k +4.96 38.cxd3 a5 39.Ke3 Kg8 40.Kd4 Kf8 41.Kc5 Ke7 42.d4 Kd7 43.d5 a4 44.b3 axb3 45.axb3 Kc7 46.d6+ Kd7 47.Kd5 Kd8 48.Kd4 Kc8 49.Kc4 Kd8 50.Kb5 Kc8 51.Kb6 Kd7 52.Kc5 Ke8 53.b4 Kd8 54.Kb6 Kc8 55.b5 g5 56.Kc5 Kd8 57.Kd5 Kc8 58.Kd4 Kd8 59.Ke5 Ke8 60.Kf6 Kd7
39/71+ 03:37 2,224,260k 10,231k +5.03 38.cxd3
39/71+ 03:38 2,238,071k 10,225k +5.10 38.cxd3
39/71+ 04:19 2,642,779k 10,202k +5.86 38.cxd3
39/71- 04:24 2,701,631k 10,198k +5.57 38.cxd3 Kg8
39/71+ 04:26 2,720,401k 10,191k +5.93 38.cxd3
39/71 04:31 2,766,321k 10,180k +6.23 38.cxd3 Kg8 39.d4 Kf8 40.Kd3 Ke7 41.b4 b6 42.Ke4 Kd6 43.d5 Kc7 44.Ke5 Kd7 45.Kd4 Kd6 46.a4 b5 47.a5 Kc7 48.Kc5 g5 49.Kd4 Kd6 50.Ke4 f6 51.Kd4 Kc7 52.Kc5 Kd7 53.Kb6 f5 54.gxf5 g4 55.f6 g3 56.f7 Ke7 57.d6+ Kxf7 58.d7 g2 59.d8Q g1Q+ 60.Kxa6
F.S.I. Chess Teacher
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Maxwell86
- Posts: 14
- Joined: Sun Jul 09, 2017 10:09 am
Re: Queen and pawn endgame
I wonder, is this common for pawn endings?
Some pawn races can be quite deep, which might explain why an engine needs some time to calculate them. But at the same time, these lines are quite forced, which would limit the branches of the search.
Some pawn races can be quite deep, which might explain why an engine needs some time to calculate them. But at the same time, these lines are quite forced, which would limit the branches of the search.
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Rodolfo Leoni
- Posts: 545
- Joined: Tue Jun 06, 2017 4:49 pm
- Location: Italy
Re: Queen and pawn endgame
If you want to see a really complicated pawn ending for engines, try opening my thread "An easy position, for humans". Then, perform a search on that position....Maxwell86 wrote:I wonder, is this common for pawn endings?
Some pawn races can be quite deep, which might explain why an engine needs some time to calculate them. But at the same time, these lines are quite forced, which would limit the branches of the search.
F.S.I. Chess Teacher
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BeyondCritics
- Posts: 396
- Joined: Sat May 05, 2012 2:48 pm
- Full name: Oliver Roese
Re: Queen and pawn endgame
Welcome to the forum.
Input of a strong grand master is always well received, especially if backed up by concrete, proven examples.
I have analyzed this a bit and i think the heart of the problem is, that stockfish does not properly evaluate pawn endings.
E.g. when using this slightly simplified position
[d]8/pp3ppk/7p/4K3/8/8/PPP3PP/8 b - - 0 1
i get a static eval of +0.45 for white . Everyone should see on the spot, that white is completely winning here. IMHO, at least the dominating king position should be considered somehow.
The excellent "Stockfish-Evaluation-Guide" (https://hxim.github.io/Stockfish-Evaluation-Guide/) allows programmers, to study the static evaluation of stockfish in detail. I was somewhat surprised to learn, that the evaluation of pawn endings presently looks very lowly, not to say completely absent. Everything carries over from some other concepts with machine tuned parameters.
I believe that stockfish in pawn endings currently relies mostly on its extremely deep and intelligent search. The position you reported is one example, where that fails.
Input of a strong grand master is always well received, especially if backed up by concrete, proven examples.
I have analyzed this a bit and i think the heart of the problem is, that stockfish does not properly evaluate pawn endings.
E.g. when using this slightly simplified position
[d]8/pp3ppk/7p/4K3/8/8/PPP3PP/8 b - - 0 1
i get a static eval of +0.45 for white . Everyone should see on the spot, that white is completely winning here. IMHO, at least the dominating king position should be considered somehow.
The excellent "Stockfish-Evaluation-Guide" (https://hxim.github.io/Stockfish-Evaluation-Guide/) allows programmers, to study the static evaluation of stockfish in detail. I was somewhat surprised to learn, that the evaluation of pawn endings presently looks very lowly, not to say completely absent. Everything carries over from some other concepts with machine tuned parameters.
I believe that stockfish in pawn endings currently relies mostly on its extremely deep and intelligent search. The position you reported is one example, where that fails.
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Rodolfo Leoni
- Posts: 545
- Joined: Tue Jun 06, 2017 4:49 pm
- Location: Italy
Re: Queen and pawn endgame
+1BeyondCritics wrote:Welcome to the forum.
Input of a strong grand master is always well received, especially if backed up by concrete, proven examples.
I got so interested by the position, and I missed to read the name...
I feel honored!
F.S.I. Chess Teacher
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Uri Blass
- Posts: 10282
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Re: Queen and pawn endgame
I do not see a problem in pawn endgame.BeyondCritics wrote:Welcome to the forum.
Input of a strong grand master is always well received, especially if backed up by concrete, proven examples.
I have analyzed this a bit and i think the heart of the problem is, that stockfish does not properly evaluate pawn endings.
E.g. when using this slightly simplified position
[d]8/pp3ppk/7p/4K3/8/8/PPP3PP/8 b - - 0 1
i get a static eval of +0.45 for white . Everyone should see on the spot, that white is completely winning here. IMHO, at least the dominating king position should be considered somehow.
The excellent "Stockfish-Evaluation-Guide" (https://hxim.github.io/Stockfish-Evaluation-Guide/) allows programmers, to study the static evaluation of stockfish in detail. I was somewhat surprised to learn, that the evaluation of pawn endings presently looks very lowly, not to say completely absent. Everything carries over from some other concepts with machine tuned parameters.
I believe that stockfish in pawn endings currently relies mostly on its extremely deep and intelligent search. The position you reported is one example, where that fails.
+0.45 for white means that white is clearly better and you cannot expect program to see that white is winning without deep search.
Evaluation that is going to say that white is winning here may also say that white is winning in some drawn position when the white king is better.
Stockfish practically avoid Qxf3 at tournament time control and it is good enough:
[D]6k1/1p3pp1/p6p/7P/3Q2P1/5P2/PPPK4/5q2 b - - 2 35
Stockfish_17071507_x64_modern:
1/1 00:00 128 128k -0.20 35. ... Qxf3
2/2 00:00 238 238k -0.14 35. ... Qxf3 36.b3
3/3 00:00 401 401k -0.16 35. ... Qxf3 36.b3 b5
4/4 00:00 767 384k +0.02 35. ... Qxf3 36.b3 Qf1 37.b4
5/8 00:00 5k 1,512k -0.54 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 Kg8 39.b3
6/9 00:00 5k 1,816k -0.47 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 g6 39.b3 Kg7
7/10 00:00 8k 2,638k -0.42 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 Kg8 39.Ke4 f6 40.Kf5
8/11 00:00 12k 2,887k -0.38 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 g6 39.Kd4 Kg7 40.c3 Kf6
9/13 00:00 25k 3,566k -0.38 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 g6 39.Ke4 Kg7 40.Ke5 a5 41.c3 b5
10/15 00:00 38k 3,803k -0.38 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 g6 39.Ke4 Kg7 40.Ke5 b5 41.c3 a5 42.Kd5 Kf6
11/15 00:00 57k 3,564k -0.38 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.Kxd3 g6 39.Ke4 Kg7 40.Ke5 b5 41.c3 a5 42.Kd5 Kf6
12/20 00:00 252k 3,763k -0.39 35. ... Qg2+ 36.Ke3 Qxc2 37.Qd8+ Kh7 38.Qd3+ Qxd3+ 39.Kxd3 g6 40.Ke4 Kg8 41.Ke5 Kg7 42.f4 f5 43.g5 hxg5 44.fxg5 Kf7
13/21 00:00 546k 4,438k -0.23 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Kc3 Kf6 41.Kc4 Kg5 42.hxg6 fxg6 43.d5
14/18 00:00 645k 4,418k -0.26 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Kc3 Kf6 41.Kc4 Kg5 42.hxg6 fxg6 43.d5 h5 44.gxh5
15/25 00:00 987k 4,701k -0.07 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Kc3 gxh5 41.gxh5 Kf6 42.Kd3 Ke6 43.Ke4 a5 44.a4 b6 45.b3 f6 46.d5+ Kd6
16/23 00:00 1,020k 4,701k -0.11 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Kc3 gxh5 41.gxh5 Kf6 42.Kd3 Ke6 43.Ke4 a5 44.a4 b6 45.b3 f6 46.d5+ Kd6
17/25 00:00 1,177k 4,707k -0.08 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 b6 43.b3 b5 44.hxg6 fxg6 45.a3 Kd6
18/23 00:00 1,347k 4,709k -0.11 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 gxh5 43.gxh5 a5 44.a4 b6 45.b3 f6 46.d5+ Kd6
19/26 00:00 1,791k 4,580k -0.11 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 gxh5 43.gxh5 a5 44.a4 b6 45.b3 f6 46.d5+ Kd6 47.Kf5 Kxd5 48.Kxf6
20/28 00:00 2,308k 4,322k -0.17 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 gxh5 43.gxh5 a5 44.d5+ Kd6 45.a4 b6 46.b3 f6 47.Kf5 Kxd5 48.Kxf6 Kc5 49.Kg6
21/28 00:00 2,679k 4,127k -0.17 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 gxh5 43.gxh5 a5 44.d5+ Kd6 45.a4 b6 46.b3 f6 47.Kf5 Kxd5 48.Kxf6 Kc5 49.Kg6
22/26 00:00 3,635k 4,145k -0.20 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 g6 39.d4 Kg7 40.Ke3 Kf6 41.Kf4 Ke6 42.Ke4 gxh5 43.gxh5 a5 44.d5+ Kd6 45.a4 b6 46.b3 f6 47.Kf5 Kxd5 48.Kg6
23/39 00:02 12,484k 4,693k -0.40 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 Kc7 43.b3 b6 44.b4 Kd7 45.a4 Kc7 46.d4 Kd7 47.Ke5 Kc6 48.d5+ Kd7 49.d6 Kc6
24/34- 00:03 14,642k 4,812k -0.47 35. ... Qxf3 36.Qd8+
24/34- 00:03 17,095k 4,869k -0.54 35. ... Qxf3 36.Qd8+
24/38- 00:04 20,590k 4,988k -0.65 35. ... Qxf3 36.Qd8+
24/38 00:04 22,334k 5,035k -0.74 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 Ke7 43.d4 a5 44.a4 g6 45.Ke5 f6+ 46.Kf4 gxh5 47.gxh5 Ke6 48.Ke4 b6 49.b3 Kd6 50.Kf5 Kd5 51.Kxf6 Kxd4 52.Kg6
25/40+ 00:04 25,448k 5,098k -0.67 35. ... Qxf3
25/40+ 00:05 26,445k 5,112k -0.60 35. ... Qxf3
25/40- 00:05 27,548k 5,122k -0.67 35. ... Qxf3 36.Qd8+
25/42+ 00:05 27,740k 5,121k -0.58 35. ... Qxf3
25/42 00:05 28,512k 5,134k -0.52 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 Ke7 43.d4 a5 44.a4 Kd7 45.Kc5 Kc7 46.b3 b6+ 47.Kb5 g5 48.b4 axb4 49.Kxb4 Kc6 50.Kc4 f6 51.d5+ Kd6 52.Kb5 Kxd5 53.Kxb6 Ke6
26/44- 00:06 31,718k 5,208k -0.59 35. ... Qxf3 36.Qd8+
26/44 00:06 32,580k 5,200k -0.59 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 a5 43.d4 Ke7 44.Ke5 Kd7 45.b3 Kc6 46.d5+ Kc7 47.Kd4 Kd7 48.a3 Kc7 49.Kc5 g5 50.a4 Kd7 51.Kc4 Kd6 52.Kd4 f5
27/33 00:06 35,867k 5,225k -0.59 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 a5 43.d4 Ke7 44.Ke5 Kd7 45.b3 Kc6 46.d5+ Kc7 47.Kd4 Kd7 48.Kc5 g5 49.a4 f5 50.gxf5 g4 51.Kd4 g3
28/42+ 00:07 41,585k 5,316k -0.52 35. ... Qxf3
28/42 00:08 42,869k 5,333k -0.53 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 Kd7 42.Kd5 a5 43.Kc5 a4 44.d4 Ke7 45.d5 Kd7 46.b4 axb3 47.axb3 g5 48.d6 Ke6 49.b4 Kd7 50.Kd5 f6 51.b5 b6 52.Ke4 Kxd6 53.Kf5
29/44 00:09 51,550k 5,311k -0.60 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 a5 42.d4 Kd7 43.Kd5 Kc7 44.b3 b6 45.a3 Kd7 46.Kc4 Kd6 47.Kb5 Kc7 48.d5 g5 49.Ka6 Kd6 50.Kxb6 Kxd5 51.Kxa5 f5 52.gxf5 g4 53.b4 Ke5 54.b5
30/37+ 00:09 53,080k 5,324k -0.53 35. ... Qxf3
30/37 00:13 70,871k 5,416k -0.49 35. ... Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3+ 38.cxd3 Kg8 39.Ke3 Kf8 40.Ke4 Ke7 41.Ke5 a5 42.Kd5 Kd7 43.Kc5 Kc7 44.d4 b6+ 45.Kd5 a4 46.a3 Kd7 47.Kc4 Kc6 48.Kb4 g5 49.Kxa4 Kd5 50.Kb5 Kxd4 51.Kxb6 f5 52.gxf5 Ke5
31/47- 00:14 80,691k 5,398k -0.56 35. ... Qxf3 36.Qd8+
31/47- 00:19 105,223k 5,354k -0.64 35. ... Qxf3 36.Qd8+
31/47- 00:24 133,315k 5,341k -0.75 35. ... Qxf3 36.Qd8+
31/48+ 00:31 169,218k 5,298k -0.65 35. ... Qg2+
31/58+ 00:34 179,758k 5,285k -0.44 35. ... Qg2+
31/63- 00:39 208,674k 5,274k -0.61 35. ... Qg2+ 36.Ke3
31/68 01:13 358,772k 4,893k -0.95 35. ... Qg2+ 36.Ke3 Qg1+ 37.Ke4 Qe1+ 38.Qe3 Qb4+ 39.Kd3 Qb5+ 40.Kd2 Qxb2 41.Qe8+ Kh7 42.Qxf7 Qd4+ 43.Ke2 Qe5+ 44.Kd3 Qd6+ 45.Kc3 Qe5+ 46.Kc4 Qe2+ 47.Kd5 Qd1+ 48.Ke6 Qe2+ 49.Kd7 Qxc2 50.Qf5+ Qxf5+ 51.gxf5 a5 52.Kc7 a4 53.Kxb7 Kg8 54.Kb6 Kf7 55.Kb5 a3 56.Kb4 Kf6 57.Kxa3 Kxf5 58.Kb4 g6 59.hxg6 Kxg6 60.a4 h5 61.a5 h4 62.a6 h3
32/60- 02:08 594,052k 4,624k -1.03 35. ... Qg2+ 36.Ke3
32/61- 03:08 872,304k 4,621k -1.10 35. ... Qg2+ 36.Ke3
32/61 03:27 957,927k 4,627k -1.10 35. ... Qg2+ 36.Ke3 Qg1+ 37.Ke4 Qe1+ 38.Qe3 Qb4+ 39.Kd3 Qb5+ 40.Kd2 Qxb2 41.Qe8+ Kh7 42.Qxf7 Qd4+ 43.Ke2 Qe5+ 44.Kd3 Qd6+ 45.Kc3 Qe5+ 46.Kc4 b5+ 47.Kb3 Qe1 48.Qf5+ Kh8 49.Qd5 Qb1+ 50.Kc3 Qe1+ 51.Kb2 Qb4+ 52.Qb3 Qd4+ 53.Qc3 Qd6 54.a3 Kg8 55.Qd3 Qxd3 56.cxd3 Kf7 57.Kc3
33/71+ 03:34 993,688k 4,625k -1.03 35. ... Qg2+
33/71 03:39 1,011,681k 4,610k -1.03 35. ... Qg2+ 36.Ke3 Qg1+ 37.Ke4 Qe1+ 38.Qe3 Qb4+ 39.Kd3 Qb5+ 40.Kd2 Qxb2 41.Qe8+ Kh7 42.Qxf7 Qd4+ 43.Ke2 Qe5+ 44.Kd3 Qd6+ 45.Kc3 Qe5+ 46.Kc4 b5+ 47.Kb3 Qa1 48.Kb4 Qe1+ 49.c3 Qd2 50.Qf5+ Kg8 51.Qe6+ Kh8 52.Qe8+ Kh7 53.Qf7 Qd6+ 54.Ka5 Qa3+ 55.Kb6 Qxc3 56.Kxa6 Qc4 57.Qg6+ Kh8 58.Qe8+ Kh7 59.Qe4+ Kh8 60.a3 Qc5
34/72 04:29 1,229,941k 4,557k -1.03 35. ... Qg2+ 36.Ke3 Qg1+ 37.Ke4 Qe1+ 38.Qe3 Qb4+ 39.Kd3 Qb5+ 40.Kd2 Qxb2 41.Qe8+ Kh7 42.Qxf7 Qd4+ 43.Ke2 Qe5+ 44.Kd3 Qd6+ 45.Kc3 Qe5+ 46.Kc4 b5+ 47.Kb3 Qa1 48.a3 a5 49.Qg6+ Kh8 50.Qe8+ Kh7 51.Qe4+ Kh8 52.Qe3 Qb1+ 53.Kc3 b4+ 54.Kd2 bxa3 55.Qxa3 Qb6 56.Qf8+ Kh7 57.Qf5+ Kh8 58.Qd5 Qb4+ 59.Kd3 Qa3+ 60.Ke2 Qb2 61.Qxa5 Qxc2+ 62.Qd2 Qc5 63.Kf1 Kh7 64.Qd3+ Kg8 65.Kg2 Qc1 66.Qd5+ Kf8 67.Qa8+ Ke7
-
Uri Blass
- Posts: 10282
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Re: Queen and pawn endgame
If I slightly change the position and put the pawn at a7 instead of a6 it seems that Kxd3 does not winMaxwell86 wrote:The following position occured in the game Dominguez Perez - Michiels (2010):
[d]6k1/1p3pp1/p6p/7P/3Q2P1/5P2/PPPK4/5q2 b - - 2 35
For humans it is intuitively clear that the pawn ending after 35....Qxf3 36.Qd8+ Kh7 37.Qd3+ should be winning for white: a centralized king and a pawn majority at the queen side.
However, Stockfish 8 thinks 35....Qxf3 is the best move for black, only at a high depth, it prefers 35....Qg2+.
After 35....Qxf3 36.Qd8+ Kh7 37.Qd3+ Qxd3, both recaptures win for white.
[d]8/1p3ppk/p6p/7P/6P1/3q4/PPPK4/8 w - - 0 38
Curiously, even in this position, Stockfish 8 needs a high depth to realize that 38.Kxd3 wins.
Just wanted to share this position!
After Kxd3
[D]8/pp3ppk/7p/7P/6P1/3K4/PPP5/8 b - - 0 38
Stockfish_17071507_x64_modern:
1/1 00:00 57 29k -0.65 38. ... Kg8
2/2 00:00 2k 856k -0.42 38. ... Kg8 39.Ke4
3/3 00:00 2k 936k -0.42 38. ... Kg8 39.Ke4 f6
4/4 00:00 2k 1,016k -0.42 38. ... Kg8 39.Ke4 f6 40.Kf5
5/5 00:00 2k 1,112k -0.42 38. ... Kg8 39.Ke4 f6 40.Kf5 Kf7
6/6 00:00 12k 2,912k -0.34 38. ... g6 39.Kd4 Kg7 40.Ke5 b6 41.c3 gxh5
7/7 00:00 14k 2,772k -0.34 38. ... g6 39.Kd4 Kg7 40.Ke5 b6 41.c3 gxh5
8/8 00:00 31k 3,459k -0.35 38. ... Kg8 39.Ke4 Kf8 40.c4 g6 41.Kd5 Ke7 42.b4
9/10 00:00 65k 4,079k -0.25 38. ... g6 39.Ke4 Kg7 40.Ke5 f5 41.gxf5 gxh5 42.b4 h4
10/15 00:00 135k 4,097k -0.02 38. ... g6 39.Ke4 Kg7 40.Ke5 f5 41.gxf5 gxh5 42.Ke6 h4 43.f6+ Kf8
11/12 00:00 157k 4,122k -0.02 38. ... g6 39.Ke4 f5+ 40.gxf5 gxh5 41.Ke5 Kg7 42.Ke6 h4 43.f6+ Kf8 44.Kf5
12/14 00:00 280k 4,239k 0.00 38. ... g6 39.Ke3 Kg7 40.Kf4 f5 41.g5 hxg5+ 42.Kxg5 gxh5 43.Kxf5 Kh6 44.c3 b6
13/14 00:00 339k 4,348k -0.05 38. ... g6 39.Ke3 Kg7 40.Kf4 f5 41.g5 hxg5+ 42.Kxg5 gxh5 43.Kxf5 Kh6 44.c4 a5 45.b3
14/19 00:00 473k 4,544k -0.08 38. ... g6 39.Ke3 Kg7 40.Kf4 Kf6 41.b3 b6 42.a4 gxh5 43.gxh5 Ke6 44.b4 f6 45.Ke4
15/16 00:00 650k 4,454k -0.08 38. ... g6 39.Ke3 Kg7 40.Kf4 Kf6 41.a4 Ke6 42.a5 b6 43.axb6 axb6 44.hxg6 fxg6 45.Ke3 b5
16/18 00:00 903k 4,679k -0.04 38. ... g6 39.Ke3 Kg7 40.Kf4 Kf6 41.b3 a5 42.c3 Ke6 43.c4 b6 44.a3 gxh5 45.gxh5 Kf6 46.b4
17/18 00:00 1,084k 4,796k -0.08 38. ... g6 39.Ke3 Kg7 40.Kf4 Kf6 41.b3 a5 42.c3 Ke6 43.a4 Kd5 44.Ke3 gxh5 45.gxh5 Ke5 46.Kf3 f5
18/23 00:00 1,643k 5,056k -0.08 38. ... g6 39.Ke3 Kg7 40.Kf4 b5 41.c3 Kf6 42.b3 a5 43.hxg6 fxg6 44.c4 bxc4 45.bxc4 Ke6 46.Ke4 Kd6 47.Kd4 h5 48.gxh5 gxh5
19/23 00:00 2,528k 5,289k -0.11 38. ... g6 39.Ke3 Kg7 40.Kf4 b5 41.c3 Kf6 42.b3 a5 43.c4 bxc4 44.bxc4 gxh5 45.gxh5 Ke6 46.Ke4 a4 47.c5 f6 48.Kd4 f5 49.a3 f4
20/27 00:00 3,380k 5,434k -0.08 38. ... g6 39.Ke4 Kg7 40.hxg6 fxg6 41.Ke5 Kf7 42.b3 a6 43.c4 a5 44.a3 h5 45.gxh5 gxh5 46.Kf5 h4 47.Kg4 h3 48.Kxh3 Ke6
21/25 00:00 3,995k 5,510k -0.08 38. ... g6 39.Ke4 Kg7 40.hxg6 fxg6 41.Ke5 Kf7 42.b3 a6 43.a4 Ke7 44.b4 h5 45.gxh5 gxh5 46.Kf5 h4 47.Kg4 h3 48.Kxh3 b5 49.axb5
22/23 00:01 5,505k 5,365k -0.08 38. ... g6 39.Ke4 Kg7 40.hxg6 fxg6 41.Ke5 Kf7 42.b3 a6 43.a4 Ke7 44.b4 h5 45.gxh5 gxh5 46.Kf5 h4 47.Kg4 h3 48.Kxh3 b5 49.axb5 axb5
23/28 00:01 11,465k 5,735k 0.00 38. ... g6 39.Ke4 Kg7 40.Kf4 b5 41.c3 f5 42.g5 hxg5+ 43.Kxg5 gxh5 44.Kxf5 h4 45.Kg4 Kf6 46.Kxh4 Kf5 47.b3 Ke4 48.c4 bxc4 49.bxc4 Kd4 50.Kg4 Kxc4 51.Kf5 Kd4
24/28 00:02 14,208k 5,828k 0.00 38. ... g6 39.Ke4 Kg7 40.Kf4 b5 41.c3 f5 42.gxf5 gxh5 43.a4 a6 44.axb5 axb5 45.b3 h4 46.c4 bxc4 47.bxc4 Kf6 48.c5 h3 49.Kg3 Kxf5 50.Kxh3 Ke5 51.c6 Kd6 52.c7
25/31 00:03 17,060k 5,651k 0.00 38. ... g6 39.Ke4 Kg7 40.Kf4 b5 41.c3 f5 42.gxf5 gxh5 43.a4 a6 44.axb5 axb5 45.b3 h4 46.c4 bxc4 47.bxc4 Kf6 48.c5 h3 49.Kg3 Kxf5 50.Kxh3 Ke5 51.c6 Kd6 52.c7 Kxc7 53.Kg2 h5
26/32+ 00:03 22,033k 5,571k +0.07 38. ... g6
26/32 00:05 28,055k 5,428k +0.08 38. ... g6 39.Ke4 f5+ 40.Kf4 fxg4 41.Kxg4 Kg7 42.c4 gxh5+ 43.Kxh5 Kf6 44.Kxh6 Ke5 45.Kg5 Kd4 46.Kf5 Kxc4 47.Ke5 Kc5 48.Ke4 b5 49.Kd3 a6 50.Ke4 a5 51.b3 Kb4 52.Kd5 Ka3 53.Kc6
27/34 00:07 41,836k 5,535k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 h5 45.b4 Kf6 46.c4 Ke6 47.Kg5 Ke5 48.a5 bxa5 49.bxa5 Kd4 50.Kxh5 Kxc4 51.Kg5 Kc5 52.Kf5 a6 53.Kg5
28/34 00:08 48,129k 5,551k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 Kf6 45.Kg4 Ke5 46.Kh5 Ke4 47.Kxh6 Ke3 48.Kg5 Kd2 49.c4 Kd3 50.c5 bxc5 51.Kf6 Kc4 52.Ke5 Kb3 53.Kd5 Kb4 54.Kc6 Kxa4 55.Kxc5
29/35 00:09 54,961k 5,643k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 Kf6 45.Kg4 Ke5 46.Kh5 Ke4 47.Kxh6 Ke3 48.Kg5 Kd2 49.c4 Kd3 50.c5 bxc5 51.Kf6 Kc4 52.Ke5 Kb3 53.Kd5 c4 54.a5 a6 55.Kd4 Kxb2
30/35 00:11 64,897k 5,743k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 Kf6 45.Kg4 Ke5 46.Kh5 Ke4 47.Kxh6 Ke3 48.Kg5 Kd2 49.c4 Kd3 50.c5 bxc5 51.Kf6 Kc4 52.Ke5 Kb3 53.Kd5 c4 54.a5 a6 55.Kd4 Kxb2
31/36 00:13 79,118k 5,896k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 Kf6 45.Kg4 Ke5 46.Kh5 Ke4 47.Kxh6 Ke3 48.Kg5 Kd2 49.c4 Kd3 50.c5 bxc5 51.Kf6 Kc4 52.Ke5 Kb3 53.Kd5 c4 54.a5 a6 55.Kc5 Kxb2 56.Kxc4
32/36 00:15 89,640k 5,936k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 a6 45.Kg4 a5 46.Kf4 Kf6 47.Kg4 Ke5 48.Kh5 Ke4 49.Kxh6 Ke3 50.Kg5 Kd2 51.c3 Kd3 52.b4 Kxc3 53.bxa5 bxa5 54.Kf4 Kb4 55.Ke3 Kc5 56.Ke4
33/39 00:18 114,825k 6,076k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 a6 45.Kg4 a5 46.Kf4 Kf6 47.Kg4 Ke5 48.Kh5 Ke4 49.Kxh6 Ke3 50.Kg5 Kd2 51.c3 Kc2 52.b4 Kxc3 53.bxa5 bxa5 54.Kf4 Kb4 55.Ke3 Kc5 56.Ke4 Kd6
34/45 00:21 133,938k 6,162k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 b6 43.hxg6 Kxg6 44.Kf4 a6 45.Kg4 Kf6 46.Kh5 Kg7 47.c3 Kh7 48.b3 Kg7 49.a5 bxa5 50.c4 Kf7 51.Kxh6 Kf6 52.Kh5 Kf5 53.Kh6 Ke4 54.Kg6 Kd4 55.Kg5 a4 56.bxa4 Kxc4 57.Kf4 Kd5
35/40- 00:28 184,458k 6,371k 0.00 38. ... g6 39.Ke3
35/41+ 00:30 191,806k 6,373k +0.08 38. ... g6
35/41 00:33 213,887k 6,406k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 gxh5+ 43.Kxh5 a5 44.c3 Kf6 45.b4 axb4 46.cxb4 Ke5 47.a5 Kd5 48.b5 Kc5 49.a6 bxa6 50.bxa6 Kb6 51.a7 Kxa7 52.Kg4 h5+ 53.Kxh5 Ka6 54.Kg6 Kb5 55.Kg5 Kb4 56.Kf6 Kc4 57.Kf7
36/41 00:36 239,663k 6,481k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 gxh5+ 43.Kxh5 a5 44.c3 Kf6 45.b4 Ke5 46.bxa5 Ke4 47.Kxh6 Kd3 48.Kg5 Kxc3 49.a6 bxa6 50.Kf4 Kb4 51.a5 Kxa5 52.Ke3 Kb6 53.Ke2 a5 54.Kd1 a4 55.Kc1 a3 56.Kb1 a2+ 57.Ka1 Kc7 58.Kxa2 Kb6
37/40 00:42 274,377k 6,464k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 gxh5+ 43.Kxh5 a5 44.c3 Kf6 45.b4 Ke5 46.bxa5 Ke4 47.Kxh6 Kd3 48.Kg5 Kxc3 49.a6 bxa6 50.Kf4 Kb4 51.a5 Kxa5 52.Ke3 Kb6 53.Ke2 a5 54.Kd1 a4 55.Kc1 a3 56.Kb1 a2+ 57.Ka1 Kc7 58.Kxa2
38/43- 00:56 359,305k 6,356k 0.00 38. ... g6 39.Ke3
38/45+ 00:58 373,476k 6,359k +0.08 38. ... g6
38/45 01:03 405,562k 6,359k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 a5 43.c3 Kf6 44.hxg6 Kxg6 45.b4 b6 46.bxa5 bxa5 47.Kf4 Kf6 48.Kg4 Ke6 49.Kh5 Kd5 50.Kxh6 Kc4 51.Kg5 Kb3 52.Kf4 Kxa4 53.Ke3 Kb3 54.Kd2 a4 55.Kc1 a3 56.Kb1 a2+ 57.Ka1 Kxc3 58.Kxa2 Kc4 59.Kb2 Kd3 60.Ka2
39/41 01:09 443,455k 6,362k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 Kg7 42.a4 a5 43.c3 Kf6 44.hxg6 Kxg6 45.b4 b6 46.bxa5 bxa5 47.Kf4 Kf6 48.Kg4 Ke6 49.Kh5 Kd5 50.Kxh6 Kc4 51.Kg5 Kb3 52.Kf4 Kxa4 53.Ke3 Kb3 54.Kd2 Kb2 55.c4 a4 56.c5 a3 57.c6 a2 58.c7 a1Q 59.c8Q
40/62- 01:17 496,620k 6,400k 0.00 38. ... g6 39.Ke3
40/62+ 01:23 533,606k 6,409k +0.08 38. ... g6
40/62 01:26 553,957k 6,392k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 b5 42.hxg6+ Kxg6 43.c3 a5 44.b3 h5+ 45.Kh4 a4 46.bxa4 bxa4 47.a3 Kf5 48.Kxh5 Ke4 49.Kg5 Kd3 50.Kf5 Kxc3 51.Ke4 Kc4 52.Ke5 Kb3 53.Kd4 Kxa3 54.Kc3 Ka2 55.Kc2 a3 56.Kc1 Kb3 57.Kb1 Kb4 58.Ka2 Ka4 59.Ka1 Kb5 60.Ka2 Kb4 61.Ka1 Ka4 62.Kb1 Kb3
41/47 01:42 652,684k 6,392k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 a5 42.c3 a4 43.c4 Kg7 44.b4 axb3 45.axb3 Kf6 46.hxg6 Kxg6 47.b4 Kf6 48.b5 Ke5 49.c5 Kd5 50.c6 bxc6 51.bxc6 Kxc6 52.Kf3 Kb6 53.Kg2 Kb7 54.Kf1 Ka7 55.Ke1 h5 56.Kf1 h4 57.Kg1 h3 58.Kh2 Ka8 59.Kg1 Kb7 60.Kh1 h2 61.Kxh2 Kb6
42/48 01:55 736,453k 6,401k +0.08 38. ... g6 39.Ke3 f5 40.Kf4 fxg4 41.Kxg4 a5 42.c3 a4 43.c4 Kg7 44.b4 axb3 45.axb3 Kf6 46.hxg6 Kxg6 47.b4 Kf6 48.b5 Ke5 49.c5 Kd5 50.c6 bxc6 51.bxc6 Kxc6 52.Kf3 Kb6 53.Kg2 Kb7 54.Kf1 Ka7 55.Ke1 h5 56.Kf1 h4 57.Kg1 h3 58.Kh2 Ka8 59.Kg1 Kb7 60.Kh1 Kb6 61.Kh2 Kc6 62.Kxh3
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Maxwell86
- Posts: 14
- Joined: Sun Jul 09, 2017 10:09 am
Re: Queen and pawn endgame
With the pawn on a7, isn't the position still winning for white? After 38....g6 39.b4! seems to win for white?
I would agree with Oliver Roese that Stockfish doesn't evaluate pawn endings very well.
I would agree with Oliver Roese that Stockfish doesn't evaluate pawn endings very well.
Last edited by Maxwell86 on Sat Jul 22, 2017 6:46 pm, edited 2 times in total.
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Uri Blass
- Posts: 10282
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Re: Queen and pawn endgame
or maybe stockfish simply cannot find the win in a pawn endgame.
Did not check if b4 is the only winning move
[D]8/pp3p1k/6pp/7P/6P1/3K4/PPP5/8 w - - 0 38 bm b4
Did not check if b4 is the only winning move
[D]8/pp3p1k/6pp/7P/6P1/3K4/PPP5/8 w - - 0 38 bm b4