h#7.5
1q6/8/7k/8/8/7b/7P/K7 w - - 0 1
- Ka2 Bg4 h4 Bd1 h5 Kg5 h6 Kf4 h7 Ke3 h8=Q Kd2 Qxb8 Kc1 Qb2#
set-play promotion excelsior excelsior:white self-block nocheck umnov
KPvkqb
5 pieces.
- h#11.5
- longest mate
- h#7.5
- deepest unique
- 342
- positions at that depth
- h#7.5
- deepest dual
- h#7
- deepest strict dual
- 474,724,360
- positions with a helpmate
- 4,949,192
- with a unique solution
- 355,074,048
- cells in the plane
- 269,401,867 bytes
- on disk
Deepest unique problems
h#7.5
8/6k1/8/8/2b5/q7/P7/K7 w - - 0 1
- Kb1 Qc5 a4 Kf6 a5 Ke5 a6 Kd4 a7 Kc3 a8=Q Kb4 Kb2 Qb5 Qa3#
set-play promotion excelsior excelsior:white self-block nocapture nocheck
h#7.5
8/7k/8/8/8/8/q5P1/K4b2 w - - 0 1
- Kxa2 Kg6 Ka3 Kf5 g4+ Ke4 g5 Kd3 g6 Kc2 g7 Kb1 g8=Q Ka1 Qa2#
promotion excelsior excelsior:white single-piece single-piece:black
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#7. The deepest dual overall is h#7.5, where the two solutions share a first or a last move.
h#7
6k1/7q/8/8/8/5b2/5P2/2K5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Be4 f3 Kf7 fxe4 Ke6 e5 Kd5 e6 Kc4 e7 Kb3 e8=Q Ka2 Qa4#
- Bg4 f3 Kf7 fxg4 Ke6 g5 Kd5 g6 Kc4 gxh7 Kb3 h8=Q Ka2 Qb2#
pure model mirror promotion excelsior excelsior:white single-piece single-piece:white nocheck umnov
h#7
8/8/7k/3b4/8/K7/P7/q7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bh1 Kb3 Kg5 a4 Kf4 a5 Ke3 a6 Kd2 a7 Kc1 a8=Q Kb1 Qxh1#
- Bb3 Kxb3 Kg5 a4 Kf4 a5 Ke3 a6 Kd2 a7 Kc1 a8=Q Kb1 Qh1#