SF Zander with 5 man syzygy finds g4 pretty quickly.MikeGL wrote: I noticed a sub-variation of this position is also interesting as engines are having difficulty to avoid the move e1Q on below position,
[d]8/8/8/5Bp1/7k/7P/4pPK1/8 b - - am e1Q;
Black to Play, Avoid Move e1Q (best is g4 first to un-trap the black K)
Engines don't want to play the clearance sacrifice g4! first.
Most engines just rush with e1Q? quickly and just results to a
fortress draw after Bg4.
Code: Select all
FEN: 8/8/8/5Bp1/7k/7P/4pPK1/8 b - - 0 1
SF Zander 080817 64 BMI2:
Found 145 tablebases
1/4 00:00 11 5,500 +6.38 e2-e1Q
2/8 00:00 98 49,000 +6.67 e2-e1Q Bf5-d3
3/9 00:00 297 148,500 +6.77 e2-e1Q Bf5-d7 Qe1-e5
4/9 00:00 659 219,666 +6.72 e2-e1Q Bf5-d7 Qe1-c3 Bd7-e8 Qc3xh3+ Kg2-g1
5/12 00:00 2,986 597,200 +7.00 e2-e1Q Bf5-d3 Qe1-e5 Kg2-f1 Qe5-e6
6/14 00:00 5,395 899,166 +6.75 e2-e1Q Bf5-d3 Qe1-e6 Bd3-f1 Qe6xh3+ Kg2-g1 Qh3-g4+ Bf1-g2 Qg4-d1+ Kg1-h2
7/14 00:00 10,333 939,363 +6.83 e2-e1Q Bf5-g4 Qe1-e5 Kg2-f1 Qe5-b5+ Kf1-e1 Qb5-d3 Bg4-e2
8/15 00:00 14,510 967,333 +6.89 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-f5 Bf3-g4 Qf5-b1 Bg4-e2
9/17 00:00 23,608 1,124,190 +6.80 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-f5 Bf3-e2 Qf5-c8 Kg2-f1 Qc8-c1+ Kf1-g2
10/20 00:00 33,895 1,303,653 +6.96 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-f5 Bf3-e2 Qf5-b1 Be2-f3 Qb1-c2 Bf3-g4 Qc2-d3
11/23 00:00 37,339 1,287,551 +6.94 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Kg2-h2 Qc6-b5 Bg4-f3 Qb5-f5 Bf3-g2 Qf5-f4+ Kh2-h1
12/21 00:00 45,013 1,286,085 +6.81 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-d3 Bg4-f3 Qd3-d7 Kg2-f1 Qd7-c8
13/20 00:00 46,959 1,304,416 +6.81 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-b7+ Bg4-f3
14/22 00:00 51,055 1,309,102 +6.83 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-d2 Kg2-f1 Qd2-d5 Kf1-e2 Qd5-d4
15/22 00:00 59,613 1,386,348 +6.84 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-d2 Kg2-f1 Qd2-d3+ Kf1-e1 Qd3-b1+ Ke1-d2
16/22 00:00 74,338 1,351,600 +6.81 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-b7+ Bg4-f3 Qb7-c8 Bf3-g4
17/22 00:00 80,163 1,358,694 +6.89 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-d5+ Bg4-f3 Qd5-d3 Bf3-g4 Qd3-d2 Bg4-f3 Qd2-c2 Bf3-g4
18/30 00:00 99,724 1,366,082 +6.89 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-d7 Bf3-g4 Qd7-d5+ Bg4-f3 Qd5-d3 Bf3-g4 Qd3-d2 Bg4-f3 Qd2-c2 Bf3-g4 Qc2-e4+ Kg2-f1 Qe4-e8 Kf1-g2 Qe8-c6+ Bg4-f3 Qc6-b5 Bf3-g4
19/28 00:00 142,932 1,458,489 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-g4 Qe5-c3 Bg4-f3 Qc3-d3 Bf3-g4 Qd3-d2 Bg4-f3 Qd2-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-c4
20/33 00:00 214,137 1,672,945 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-g4 Qe5-c3 Bg4-f3 Qc3-c4 Bf3-g4 Qc4-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-d3 Bf3-g4
21/40 00:00 259,183 1,751,236 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-g4 Qe5-c3 Bg4-f3 Qc3-c4 Bf3-g4 Qc4-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-d3 Bf3-g4 Qd3-d5+ Bg4-f3 Qd5-b5 Bf3-g4 Qb5-b4 Bg4-f3 Qb4-d2 Bf3-g4 Qd2-c2 Bg4-f3
22/43 00:00 280,354 1,774,392 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-d5+ Bd1-f3 Qd5-b5 Bf3-g4 Qb5-c6+ Bg4-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-c4 Bf3-g4 Qc4-c1 Bg4-f3 Qc1-d2 Bf3-g4 Qd2-c2 Bg4-f3 Qc2-c1 Bf3-g4 Qc1-c3
23/31 00:00 336,498 1,859,104 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-d5+ Bd1-f3 Qd5-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-e6 Bf3-g4 Qe6-e1 Bg4-f3 Qe1-b1 Bf3-e2
24/36 00:00 373,144 1,903,795 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-c4 Bf3-g4 Qc4-d5+ Bg4-f3 Qd5-b3 Bf3-g4 Qb3-c4 Bg4-f3 Qc4-d3
25/44 00:00 465,547 1,989,517 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-c4 Bf3-g4 Qc4-d5+ Bg4-f3 Qd5-b3 Bf3-g4 Qb3-c4 Bg4-f3 Qc4-d3 Bf3-g4 Qd3-d4 Bg4-e2 Qd4-d6 Be2-f3
26/38 00:00 529,300 2,027,969 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-d4 Bf3-g4 Qd4-c3 Bg4-f3 Qc3-b3 Bf3-g4 Qb3-d5+ Bg4-f3 Qd5-d3 Bf3-g4
27/46 00:00 604,278 2,069,445 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-d3 Bf3-g4 Qd3-d5+ Bg4-f3 Qd5-d7 Bf3-g4 Qd7-d2 Bg4-f3 Qd2-c1 Bf3-g4 Qc1-c3 Bg4-f3 Qc3-a3 Bf3-g4
28/38 00:00 707,735 2,106,354 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-c6+ Bd1-f3 Qc6-c1 Bf3-g4 Qc1-c3 Bg4-f3 Qc3-d2 Bf3-g4 Qd2-d5+ Bg4-f3 Qd5-d3 Bf3-g4 Qd3-e4+ Bg4-f3 Qe4-d4 Bf3-g4
29/42 00:00 940,741 2,218,728 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-d5+ Bd1-f3 Qd5-a2 Bf3-g4 Qa2-b1 Bg4-f3 Qb1-c1 Bf3-g4 Qc1-c3 Bg4-f3 Qc3-d2 Bf3-g4 Qd2-c2 Bg4-f3
30/40 00:00 1,174,370 2,203,320 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-a1 Bd1-f3 Qa1-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-b5 Bf3-d1 Qb5-d5+ Bd1-f3 Qd5-d7 Bf3-g4 Qd7-d2 Bg4-f3 Qd2-c1 Bf3-g4 Qc1-c3 Bg4-f3 Qc3-d2 Bf3-g4 Qd2-d4 Bg4-f3 Qd4-d3 Bf3-g4
31/42 00:00 1,582,303 2,185,501 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-c6+ Bd1-f3 Qc6-b5 Bf3-d1 Qb5-d5+ Bd1-f3 Qd5-e5 Bf3-d1 Qe5-e8 Bd1-f3 Qe8-d7 Bf3-g4 Qd7-d2 Bg4-f3 Qd2-d3 Bf3-g4 Qd3-c2 Bg4-f3 Qc2-c4 Bf3-g4 Qc4-b3 Bg4-f3 Qb3-c2 Bf3-g4 Qc2-c4 Bg4-f3 Qc4-b3 Bf3-g4
32/50 00:00 1,759,181 2,215,593 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-c6+ Bd1-f3 Qc6-c1 Bf3-g4 Qc1-d2 Bg4-f3 Qd2-c2 Bf3-g4 Qc2-e4+ Bg4-f3 Qe4-c4 Bf3-d1 Qc4-d4 Bd1-f3 Qd4-d3 Bf3-g4 Qd3-d5+ Bg4-f3 Qd5-e5 Bf3-d1 Qe5-b2 Bd1-g4 Qb2-c3 Bg4-f3 Qc3-d2 Bf3-g4 Qd2-e1 Bg4-f3
33/49 00:00 2,190,764 2,310,932 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-c6+ Bd1-f3 Qc6-c2 Bf3-g4 Qc2-b1 Bg4-e2 Qb1-f5 Be2-g4 Qf5-d5+ Bg4-f3 Qd5-d3 Bf3-g4 Qd3-c3 Bg4-f3 Qc3-e5 Bf3-g4 Qe5-e1 Bg4-f3 Qe1-e6 Bf3-g4 Qe6-e4+ Bg4-f3 Qe4-e8 Bf3-d1 Qe8-b5 Bd1-f3 Qb5-b2 Bf3-d1 Qb2-a3 Bd1-g4
34/46 00:01 2,511,352 2,360,293 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-c6+ Bd1-f3 Qc6-d7 Bf3-g4 Qd7-d5+ Bg4-f3 Qd5-d3 Bf3-g4 Qd3-c3 Bg4-f3 Qc3-e5 Bf3-g4 Qe5-e1 Bg4-f3 Qe1-e6 Bf3-g4 Qe6-e4+ Bg4-f3 Qe4-c2 Bf3-g4 Qc2-c4 Bg4-d1 Qc4-f4 Bd1-g4 Qf4-d2 Bg4-f3 Qd2-b2 Bf3-d1 Qb2-a1 Bd1-g4 Qa1-b1 Bg4-f3
35/49 00:01 3,141,863 2,394,712 +6.71 e2-e1Q Bf5-g4 Qe1-e5 Bg4-f3 Qe5-c3 Bf3-g4 Qc3-d3 Bg4-f3 Qd3-a6 Bf3-d1 Qa6-c6+ Bd1-f3 Qc6-d6 Bf3-g4 Qd6-d4 Bg4-f3 Qd4-d3 Bf3-g4 Qd3-c3 Bg4-f3 Qc3-e5 Bf3-d1 Qe5-e4+ Bd1-f3 Qe4-c2 Bf3-g4 Qc2-b1 Bg4-f3 Qb1-f5 Bf3-g4 Qf5-c2 Bg4-f3 Qc2-b3 Bf3-g4 Qb3-d5+ Bg4-f3 Qd5-d2 Bf3-g4 Qd2-d6 Bg4-f3 Qd6-a3 Bf3-g4 Qa3-c1 Bg4-f3
36/50+ 00:01 4,170,758 2,388,750 +6.78 g5-g4
36/47+ 00:02 7,242,452 2,500,846 +7.91 g5-g4
36/39+ 00:03 10,069,031 2,547,187 +18.41 g5-g4
36/55 00:06 16,310,741 2,652,153 +128.38 g5-g4 Bf5xg4 e2-e1Q Bg4-f3 Qe1-d2 Bf3-g4 Kh4-g5 Bg4-f3 Kg5-f5 Kg2-f1 Qd2-f4 Kf1-g2 Kf5-e5 Bf3-g4 Ke5-d4 Bg4-f3 Kd4-c3 Bf3-h5 Kc3-d2 Bh5-g4 Kd2-e1 f2-f3 Ke1-e2 h3-h4 Qf4-d2 Bg4-c8 Ke2-e3+ Kg2-g3 Qd2-f2+ Kg3-g4 Qf2xf3+
37/53 00:06 18,385,950 2,656,545 +128.38 g5-g4 Bf5xg4 e2-e1Q Bg4-f3 Qe1-d2 Bf3-g4 Kh4-g5 Bg4-f3 Kg5-f5 Kg2-f1 Qd2-f4 Kf1-g2 Kf5-e5 Bf3-g4 Ke5-d4 Bg4-f3 Kd4-d3 Bf3-d1 Kd3-d2 Bd1-g4 Kd2-e1 f2-f3 Ke1-e2 h3-h4 Qf4-d2 Bg4-c8 Ke2-e3+ Kg2-g3 Qd2-f2+ Kg3-g4 Qf2xf3+
38/56 00:07 20,606,741 2,663,057 +128.38 g5-g4 Bf5xg4 e2-e1Q Bg4-f3 Qe1-d2 Bf3-g4 Kh4-g5 Bg4-f3 Kg5-f5 Kg2-f1 Qd2-f4 Kf1-g2 Kf5-e5 Bf3-g4 Ke5-d4 Bg4-f3 Kd4-d3 Bf3-d1 Kd3-d2 Bd1-g4 Kd2-e1 f2-f3 Ke1-e2 h3-h4 Qf4-d2 Bg4-c8 Ke2-e3+ Kg2-g3 Qd2-f2+ Kg3-g4 Qf2xf3+
39/53 00:08 23,016,573 2,658,109 +128.38 g5-g4 Bf5xg4 e2-e1Q Bg4-f3 Qe1-d2 Bf3-g4 Kh4-g5 Bg4-f3 Kg5-f5 Kg2-f1 Qd2-f4 Kf1-g2 Kf5-e5 Bf3-g4 Ke5-d4 Bg4-f3 Kd4-d3 Bf3-d1 Kd3-d2 Bd1-g4 Kd2-e1 f2-f3 Ke1-e2 h3-h4 Qf4-d2 Bg4-c8 Ke2-e3+ Kg2-g3 Qd2-f2+ Kg3-g4 Qf2xf3+
40/56 00:10 26,616,158 2,646,530 +128.38 g5-g4 Bf5xg4 e2-e1Q Bg4-f3 Qe1-d2 Bf3-g4 Kh4-g5 Bg4-f3 Kg5-f5 Kg2-f1 Qd2-f4 Kf1-g2 Kf5-e5 Bf3-g4 Ke5-d4 Bg4-f3 Kd4-d3 Bf3-d1 Qf4-h4 Bd1-g4 Kd3-d2 Kg2-f1 Qh4-f6 Bg4-h5 Qf6-f4 Kf1-g2 Kd2-e1 Bh5-f3 Qf4-h4 Bf3-g4 Qh4xf2+