KQPvkp
5 pieces.
- h#15
- longest mate
- h#8
- deepest unique
- 42
- positions at that depth
- h#10
- deepest dual
- h#4.5
- deepest strict dual
- 372,247,812
- positions with a helpmate
- 26,080,972
- with a unique solution
- 266,305,536
- cells in the plane
- 262,689,171 bytes
- on disk
Deepest unique problems
h#8
8/p7/8/8/1K6/8/P5Q1/7k b - - 0 1
- Kxg2 a4 a5+ Kxa5 Kf3 Kb4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
pure model ideal mirror promotion excelsior excelsior:white switchback phoenix
Note: the side to move is in check in the diagram; the solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#4.5. The deepest dual overall is h#10, where the two solutions share a first or a last move.
h#4.5
8/8/8/8/7k/p1Q5/2P5/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Qh3+ Kg5 c4 Kf6 c5 Ke7 c6 Kd8 Qd7#
- Qc4+ Kg3 Ka2 Kf2 Kb3 Ke1 Kc3 Kd1 Qf1#
h#4.5
8/8/8/7k/8/2p5/1PQ5/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Kg4 Qg6+ Kf3 Kc2 Kf2 Kd3 Ke1 Qg1#
- Ka2 Kg4 Kb3 Kf3 Qf5+ Ke2 Kxc3 Kd1 Qf1#
h#4.5
6k1/8/3p4/8/8/1P6/5Q2/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Qb6 Kf7 Kb2 Ke6 Kc3 Kd5 Qb7+ Kc5 b4#
- Qa7 Kf8 b4 Ke8 b5 Kd8 b6 Kc8 Qc7#