h#8
5b2/8/8/6B1/8/7b/7k/K3B3 b - - 0 1
- Bf5 Kb2 Kh3 Kc3 Kg4 Kd4 Kxg5 Ke5 Kh6 Kf6 Kh7 Kf7 Kh8 Kxf8 Bh7 Bc3#
KBBvkbb
6 pieces.
- h#10
- longest mate
- h#8
- deepest unique
- 129
- positions at that depth
- h#8
- deepest dual
- h#7
- deepest strict dual
- 2,010,085,546
- positions with a helpmate
- 66,839,297
- with a unique solution
- 7,751,073,792
- cells in the plane
- 1,445,626,201 bytes
- on disk
Deepest unique problems
h#8
8/4b3/8/7b/5B2/8/1B5k/K7 b - - 0 1
- Kh3 Ka2 Kg4 Kb3 Kf5 Kc4 Kg6 Kd5 Kh7 Ke6 Bf7+ Kxe7 Bg8 Kf6 Kh8 Kg6#
self-block single-piece single-piece:white
Note: the side to move is in check in the diagram.
h#8
1k6/8/1B6/2B5/8/2b5/8/1K1b4 b - - 0 1
- Bc2+ Ka2 Bh7 Kb3 Kc8 Kxc3 Kd7 Kd4 Ke8 Ke5 Kf7 Bd4 Kg8 Kf6 Kh8 Kf7#
Deepest dual problems
Deepest dual with different first and last moves: h#7. The deepest dual overall is h#8, where the two solutions share a first or a last move.
h#7
5k2/8/2B5/8/8/2b5/4b3/2K4B b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bd4 Kd2 Ke7 Kxe2 Kd6 Kf3 Kxc6 Ke4 Kb7 Kd5 Ka8 Kc6 Ba7 Kc7#
- Be5 Kd2 Ke7 Kxe2 Kd6 Kf3 Kxc6 Ke4 Kb7 Kd5 Ka8 Kc6 Bb8 Kb6#
h#7
8/8/1b6/1B6/8/3b4/Bk6/3K4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ka3 Kd2 Kb4 Kxd3 Kxb5 Ke4 Ka6 Kd5 Ka7 Kc6 Ka8 Bd5 Ba7 Kc7#
- Kc3 Bxd3 Kxd3 Bd5 Ke3 Kc2 Kf2 Kd3 Kg1 Ke4 Kh1 Kf3 Bg1 Kg3#
h#7
8/6b1/8/5b2/8/8/1B3Bk1/3K4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf3 Kc1 Ke4 Kb1 Kd3 Ka2 Kc2 Ka3 Kb1 Bc1 Ka1 Bh6 Bb1 Bxg7#
- Kxf2 Bxg7 Ke3 Ke1 Kd3 Kf2 Kc2 Ke3 Kb1 Kd4 Ka1 Kc3 Bb1 Kb3#