h#8.5
K7/8/8/8/8/2n5/2P5/2q4k w - - 0 1
- Ka7 Nd5 c4 Kg2 cxd5 Kf3 d6 Ke4 d7 Kd5 d8=Q+ Kc6 Qd5+ Kc7 Ka6 Kb8 Qb7#
KPvkqn
5 pieces.
- h#9.5
- longest mate
- h#8.5
- deepest unique
- 1
- positions at that depth
- h#8
- deepest dual
- h#7.5
- deepest strict dual
- 486,907,157
- positions with a helpmate
- 4,501,794
- with a unique solution
- 355,074,048
- cells in the plane
- 226,355,141 bytes
- on disk
Deepest unique problems
Only one position exists at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#7.5. The deepest dual overall is h#8, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#7.5
8/8/6k1/8/2n5/2q5/2P5/2K5 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Qd2 Ka1 Nb6 c4 Kf5 c5 Ke4 cxb6 Kd3 b7 Kc2 b8=Q Kc1 Qb1#
- Kd1 Qb2 Ke1 Nd6 c4 Kf5 c5 Ke4 cxd6 Kd3 d7 Kc2 d8=Q Kc1 Qd1#
promotion excelsior excelsior:white self-block nocheck umnov