h#6
8/8/7k/6Q1/8/2n5/1n6/K7 b - - 0 1
- Kh7 Kxb2 Kh8 Kxc3 Kh7 Kd4 Kh8 Ke5 Kh7 Kf6 Kh8 Qg7#
pure model ideal switchback single-piece single-piece:black nocheck
Note: the side to move is in check in the diagram.
KQvknn
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 9
- positions at that depth
- h#6
- deepest dual
- h#5
- deepest strict dual
- 76,677,832
- positions with a helpmate
- 3,761,728
- with a unique solution
- 121,110,528
- cells in the plane
- 41,925,443 bytes
- on disk
Deepest unique problems
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
8/8/8/4k3/2nQ4/8/8/K1n5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf5 Qf6+ Ke4 Kb1 Ke3 Kc2 Ke2 Kc3 Kd1 Qf1#
- Ke6 Qxc4+ Kd6 Qe6+ Kc5 Kb2 Kb5 Kc3 Ka4 Qa6#
pure model mirror single-piece single-piece:black umnov
Note: the side to move is in check in the diagram.
h#5
8/8/8/4k3/3Q4/2n5/8/K2n4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf5 Qxc3 Ke4 Qe1+ Kd3 Ka2 Kc2 Ka3 Kb1 Qxd1#
- Ke6 Qxc3 Kd5 Qe5+ Kc4 Kb1 Kb4 Kc2 Ka3 Qa5#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#5
8/4k3/3Q4/8/2n5/8/n7/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf7 Kc2 Kg7 Kd3 Ne5+ Ke4 Ng6 Kf5 Kh6 Qxg6#
- Ke8 Qf8+ Kd7 Kxa2 Kc6 Kb3 Kb5 Kc3 Ka4 Qb4#
single-piece single-piece:black
Note: the side to move is in check in the diagram.