h#7
8/8/6b1/8/8/8/3B3k/K3B3 b - - 0 1
- Kh3 Kb2 Kg4 Kc3 Kf5 Kd4 Kf6 Bc3 Kg7 Ke5 Kh8 Kf6 Bh7 Kf7#
KBBvkb
5 pieces.
- h#10.5
- longest mate
- h#7
- deepest unique
- 95
- positions at that depth
- h#7
- deepest dual
- h#6
- deepest strict dual
- 62,668,079
- positions with a helpmate
- 2,254,029
- with a unique solution
- 121,110,528
- cells in the plane
- 34,383,400 bytes
- on disk
Deepest unique problems
h#7
1k6/8/5B2/4B3/8/1b6/8/1K6 b - - 0 1
- Kc8 Ba1 Kd7 Kb2 Ke6 Kc3 Kxf6 Kd4 Kg7 Ke5 Kh8 Kf6 Bg8 Kg6#
Note: the side to move is in check in the diagram.
h#7
1k6/5b2/3B3B/8/8/8/8/2K5 b - - 0 1
- Kc8 Kd2 Kd7 Ke3 Ke6 Kf4 Kf6 Bg7+ Kxg7 Kg5 Kh8 Kh6 Bg8 Be5#
Note: the side to move is in check in the diagram.
Deepest dual problems
Deepest dual with different first and last moves: h#6. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#6
8/6B1/8/4k2b/8/2B5/8/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf5 Kc2 Bf7 Kd3 Kg6 Kd4 Kxg7 Ke5 Kh8 Kf6 Bg8 Kg6#
- Ke6 Kc2 Kf7 Kd3 Bg6+ Kd4 Kxg7 Ke5 Kh8 Kf6 Bh7 Kf7#
self-block single-piece single-piece:white
Note: the diagram has no legal last move, so it cannot arise in a game.
h#6
8/6B1/6b1/6B1/5k2/8/8/3K4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke4 Ke1 Kd3 Kf2 Kc2 Ke3 Kb1 Kd4 Ka1 Kc3 Bb1 Kb3#
- Kf5 Ke2 Bh7 Kf3 Kg6 Kg4 Kxg7 Kh5 Kh8 Kh6 Bg8 Bf6#
self-block single-piece single-piece:white nocheck
Note: the side to move is in check in the diagram.
h#6
8/8/4k3/4B3/8/8/8/BK1b4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bc2+ Kb2 Kxe5 Kc3 Kf6 Kd4 Kg7 Ke5 Kh8 Kf6 Bh7 Kf7#
- Bb3 Kb2 Kxe5 Kc3 Kf6 Kd4 Kg7 Ke5 Kh8 Kf6 Bg8 Kg6#