h#8.5
8/8/p7/8/P7/P7/K7/7k w - - 0 1
- Kb3 Kg2 Kb4 a5+ Kxa5 Kf3 Kb4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
KPPvkp
5 pieces.
- h#14.5
- longest mate
- h#8.5
- deepest unique
- 6
- positions at that depth
- h#10
- deepest dual
- h#6.5
- deepest strict dual
- 163,258,850
- positions with a helpmate
- 3,694,617
- with a unique solution
- 199,729,152
- cells in the plane
- 108,606,681 bytes
- on disk
Deepest unique problems
h#8.5
8/p7/8/8/P7/8/P2K4/7k w - - 0 1
- Kc3 Kg2 Kb4 a5+ Kxa5 Kf3 Kb4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
h#8.5
8/8/p7/8/P7/P7/3K4/7k w - - 0 1
- Kc3 Kg2 Kb4 a5+ Kxa5 Kf3 Kb4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
Deepest dual problems
Deepest dual with different first and last moves: h#6.5. The deepest dual overall is h#10, where the two solutions share a first or a last move.
h#6.5
8/8/6k1/4p3/8/6P1/K5P1/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ka3 Kf5 g4+ Ke4 g5 Kd3 g6 Kc2 g7 Kb1 g8=Q Ka1 Qa2#
- g4 e4 g5 Kh5 g6 e3 g7 e2 g8=Q e1=B Qg7 Bh4 g4#
pure model promotion underpromotion switchback self-block single-piece single-piece:black nocapture umnov
h#6.5
8/8/8/8/7k/5p1P/2K4P/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb3 Kg5 h4+ Kf4 h5 Ke3 h6 Kd2 h7 Kc1 h8=Q Kb1 Qb2#
- Kd3 Kg5 h4+ Kf4 h5 f2 h6 f1=R h7 Rg1 h8=Q Rg4 Qf6#
pure model ideal promotion underpromotion self-block single-piece single-piece:black nocapture umnov
h#6.5
8/8/8/2p5/2P5/3K4/3P4/6k1 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc2 Kf2 d4 Ke3 d5 Kd4 d6 Kxc4 d7 Kb4 d8=Q Ka3 Qa5#
- Ke4 Kh1 d4 cxd4 c5 d3 c6 d2 c7 d1=R c8=Q Rg1 Qh3#
pure model mirror promotion underpromotion excelsior excelsior:white self-block single-piece single-piece:black nocheck umnov zilahi