h#7.5
8/8/2K5/8/N7/8/P5b1/7k w - - 0 1
- Kd6 Kg1 Nc5 Kf2 a4 Ke3 a5 Kd4 a6 Kc4 a7 Kb5 a8=Q Kb6 Qa6#
promotion excelsior excelsior:white closed-walk single-piece single-piece:black nocapture nocheck
Note: the side to move is in check in the diagram.
KNPvkb
5 pieces.
- h#11
- longest mate
- h#7.5
- deepest unique
- 4
- positions at that depth
- h#7.5
- deepest dual
- h#7
- deepest strict dual
- 542,129,015
- positions with a helpmate
- 11,935,803
- with a unique solution
- 355,074,048
- cells in the plane
- 344,826,897 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#7. The deepest dual overall is h#7.5, where the two solutions share a first or a last move.
h#7
2K1N3/8/8/8/8/2b5/2P5/6k1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bb4 c3 Kf2 cxb4 Ke3 b5 Kd4 b6 Kc5 b7 Kb6 Nc7 Ka7 b8=Q#
- Bd4 c3 Kf2 cxd4 Ke3 d5 Kd4 d6 Kc5 d7 Kb6 d8=Q+ Ka7 Qa5#
pure mirror promotion excelsior excelsior:white single-piece single-piece:white umnov
h#7
8/8/7k/3b4/8/K7/P7/N7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bh1 Kb3 Kg5 a4 Kf4 a5 Ke3 a6 Kd2 a7 Kc1 a8=Q Kb1 Qxh1#
- Bb3 Kxb3 Kg5 a4 Kf4 a5 Ke3 a6 Kd2 a7 Kc1 a8=Q Kb1 Qh1#