h#9.5
8/8/5q2/8/8/1k6/8/1K1n1B2 w - - 0 1
- Kc1 Nf2 Kd2 Nh3 Ke3 Kc2 Bd3+ Kd1 Bf5 Ke1 Kf3 Kf1 Kg3 Kg1 Bd3 Kh1 Bf1 Ng1 Bg2#
KBvkqn
5 pieces.
- h#13
- longest mate
- h#9.5
- deepest unique
- 46
- positions at that depth
- h#10
- deepest dual
- h#7
- deepest strict dual
- 151,550,341
- positions with a helpmate
- 306,932
- with a unique solution
- 121,110,528
- cells in the plane
- 54,880,661 bytes
- on disk
Deepest unique problems
h#9.5
8/8/8/8/n7/2q5/2k5/K4B2 w - - 0 1
- Ka2 Nc5 Bc4 Na6 Bb3+ Kd3 Ka3 Kd4 Ka4 Kc5 Be6 Kb6 Bc8 Ka7 Kb5 Ka8 Kb6 Nb8 Bb7#
pure model self-block nocapture
Note: the side to move is in check in the diagram.
h#9.5
8/8/1n6/3B4/8/4q3/8/k1K5 w - - 0 1
- Kc2 Nc8 Be4 Ka2 Bd3 Ka3 Kc3 Ka4 Kc4 Ka5 Kd5 Kb6 Ba6 Ka7 Kc6 Ka8 Kc7 Na7 Bb7#
pure model self-block nocapture nocheck
Note: the side to move is in check in the diagram.
Deepest dual problems
Deepest dual with different first and last moves: h#7. The deepest dual overall is h#10, where the two solutions share a first or a last move.
h#7
5q2/8/5k2/8/8/1n4B1/8/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nc1 Bh4+ Ke5 Kc2 Kd4 Kd1 Kc3 Be7 Kb2 Ba3+ Ka1 Kc2 Na2 Bb2#
- Nc5 Kc2 Nd7 Kd3 Kg7 Ke4 Nf6+ Kf5 Kh8 Kg6 Ng8 Be5+ Qg7+ Bxg7#
h#7
7q/8/8/6n1/4k3/2B5/8/2K5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd3 Kb2 Ne4 Ka3 Kc2 Bxh8 Kb1 Bb2 Nc3 Bc1 Ka1 Kb3 Nb1 Bb2#
- Kf5 Kd2 Kg6 Ke3 Kh7 Kf4 Qd4+ Kf5 Kh8 Kg6 Nh7 Kf7 Qg7+ Bxg7#
h#7
5q2/2B5/5k2/8/8/1n6/8/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nc1 Bd8+ Ke5 Kc2 Kd4 Kd1 Kc3 Be7 Kb2 Ba3+ Ka1 Kc2 Na2 Bb2#
- Nc5 Kc2 Nd7 Kd3 Kg7 Ke4 Nf6+ Kf5 Kh8 Kg6 Ng8 Be5+ Qg7+ Bxg7#