h#7
8/8/8/8/K7/PP4P1/8/7k b - - 0 1
- Kg2 Kb4 Kf3 a4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
pure model mirror promotion single-piece single-piece:black nocapture nocheck
KPPPvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 2
- positions at that depth
- h#7
- deepest dual
- h#6
- deepest strict dual
- 54,440,174
- positions with a helpmate
- 2,059,140
- with a unique solution
- 199,729,152
- cells in the plane
- 42,117,738 bytes
- on disk
Deepest unique problems
Only one distinct idea exists at this depth: 2 positions share a solution.
Deepest dual problems
Deepest dual with different first and last moves: h#6. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#6
8/8/8/K7/8/2PP4/1kP5/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc1 d4 Kd2 d5 Ke3 d6 Ke4 d7 Kd5 d8=Q+ Kc4 Qd4#
- Kxc3 d4 Kc4 d5 Kc5 d6 Kc6 d7 Kc7 Ka6 Kb8 d8=Q#
pure model mirror promotion closed-walk single-piece single-piece:white single-piece:black
h#6
8/8/8/K7/8/3P4/1PkP4/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd1 b4 Ke2 b5 Kf3 b6 Kf4 b7 Ke5 b8=Q+ Kd4 Qd6#
- Kb3 d4 Kc4 d5 Kc5 d6 Kc6 d7 Kc7 Ka6 Kb8 d8=Q#
pure model mirror promotion excelsior excelsior:white single-piece single-piece:white single-piece:black nocapture
h#6
8/8/8/1K6/8/3PP3/2kP4/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd1 e4 Ke2 e5 Kf3 e6 Kf4 e7 Ke5 e8=Q+ Kd4 Qe4#
- Kxd3 e4 Kd4 e5 Kd5 e6 Kd6 e7 Kd7 Kb6 Kc8 e8=Q#
pure model mirror promotion closed-walk single-piece single-piece:white single-piece:black