h#7
8/8/8/8/4N3/K3P3/4P3/k7 b - - 0 1
- Kb1 Nd6 Kc2 e4 Kc3 e5 Kd4 e6 Kc5 e7 Kb6 e8=Q Ka5 Qb5#
KNPPvk
5 pieces.
- h#8.5
- longest mate
- h#7
- deepest unique
- 18
- positions at that depth
- h#7
- deepest dual
- h#6.5
- deepest strict dual
- 214,316,389
- positions with a helpmate
- 8,308,231
- with a unique solution
- 266,305,536
- cells in the plane
- 187,170,131 bytes
- on disk
Deepest unique problems
h#7
8/8/8/8/8/5N2/K4PP1/7k b - - 0 1
- Kxg2 Nd4 Kf1 f4 Ke1 f5 Kd2 f6 Kc3 f7 Kb4 f8=Q+ Ka4 Qa3#
promotion excelsior excelsior:white single-piece single-piece:black
Note: the solution begins with a capture.
h#7
8/2N5/8/8/8/2PK4/2P4k/8 b - - 0 1
- Kg3 c4 Kf4 c5 Ke5 c6 Kd6 Nd5 Kc5 c7 Kb5 c8=Q Ka4 Qa6#
pure model mirror promotion single-piece single-piece:black nocapture nocheck
Deepest dual problems
Deepest dual with different first and last moves: h#6.5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#6.5
8/2N5/8/8/8/2PK1k2/2P5/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd2 Ke4 Nb5 Kd5 c4+ Kc6 c5 Kb7 c6+ Kb8 c7+ Ka8 c8=Q#
- c4 Kf4 c5 Ke5 c6 Kd6 Nd5 Kc5 c7 Kb5 c8=Q Ka4 Qa6#
pure model mirror promotion single-piece single-piece:black nocapture umnov