h#5.5
8/8/7k/8/8/1bb5/8/KQ6 w - - 0 1
- Qb2 Kg5 Qxc3 Kf4 Qf6+ Ke3 Kb2 Ke2 Kc3 Kd1 Qf1#
pure model mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
KQvkbb
5 pieces.
- h#7
- longest mate
- h#5.5
- deepest unique
- 4
- positions at that depth
- h#6
- deepest dual
- h#5
- deepest strict dual
- 72,013,421
- positions with a helpmate
- 3,361,114
- with a unique solution
- 121,110,528
- cells in the plane
- 53,958,289 bytes
- on disk
Deepest unique problems
h#5.5
6Q1/8/7k/8/3b4/8/b7/K7 w - - 0 1
- Kxa2 Kh5 Kb1 Kh4 Qa2 Kg3 Kc2 Kf2 Kd3+ Ke1 Qe2#
single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#5.5
8/7k/5Q2/8/8/2b5/2b5/K7 w - - 0 1
- Ka2 Bg6 Kb3 Kg8 Kc4 Bf7+ Kc5 Kf8 Kd6 Ke8 Qe7#
Note: the side to move is in check in the diagram.
Deepest dual problems
Deepest dual with different first and last moves: h#5. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#5
8/6k1/5Q2/8/8/8/1K2b3/4b3 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Kc2 Bh5 Kd3 Bg6+ Ke3 Kh6 Kf4 Kh5 Qg5#
- Kg8 Kb3 Bh5 Kc4 Bf7+ Kc5 Kf8 Kd6 Ke8 Qe7#
Note: the side to move is in check in the diagram.
h#5
8/6k1/5Q2/8/7b/8/1K6/7b b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Kc3 Bg5 Kd4 Bh6 Ke5 Bg7 Kf5 Bh8 Qg6#
- Kg8 Kc3 Bg5 Kd4 Bh6 Ke5 Bg7 Ke6 Bh8 Qf7#
pure model self-block nocapture nocheck
Note: the side to move is in check in the diagram.
h#5
3b3k/8/5Q2/8/8/8/1K4b1/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Kc3 Be7 Kd4 Bf8 Ke5 Bg7 Kf5 Bh8 Qg6#
- Kg8 Kc3 Be7 Kd4 Bf8 Ke5 Bg7 Ke6 Bh8 Qf7#
pure model self-block nocapture nocheck
Note: the side to move is in check in the diagram.