h#7
8/8/6R1/7k/8/6P1/K5P1/8 b - - 0 1
- Kxg6 Ka3 Kf5 g4+ Ke4 g5 Kd3 g6 Kc2 g7 Kb1 g8=Q Ka1 Qa2#
promotion single-piece single-piece:black
Note: the solution begins with a capture.
KRPPvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 2
- positions at that depth
- h#7
- deepest dual
- h#5.5
- deepest strict dual
- 201,202,332
- positions with a helpmate
- 14,707,558
- with a unique solution
- 266,305,536
- cells in the plane
- 117,745,297 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
h#7
8/8/8/8/K7/PP6/6R1/7k b - - 0 1
- Kxg2 Kb4 Kf3 a4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
pure model mirror promotion single-piece single-piece:black nocheck
Note: the solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#5.5
K7/8/8/8/8/8/1P2PR2/7k w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- b4 Kg1 b5 Kh1 b6 Kg1 b7 Kh1 b8=Q Kg1 Qh2#
- e4 Kg1 e5 Kh1 e6 Kg1 e7 Kh1 e8=Q Kg1 Qe1#
promotion excelsior excelsior:white switchback single-piece single-piece:white single-piece:black pendulum nocapture nocheck
h#5.5
K7/8/8/8/8/4P3/1P3R2/7k w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- e4 Kg1 e5 Kh1 e6 Kg1 e7 Kh1 e8=Q Kg1 Qe1#
- b4 Kg1 b5 Kh1 b6 Kg1 b7 Kh1 b8=Q Kg1 Qh2#
promotion excelsior excelsior:white switchback single-piece single-piece:white single-piece:black pendulum nocapture nocheck
h#5.5
K7/8/8/8/8/7P/4PR2/7k w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- h4 Kg1 h5 Kh1 h6 Kg1 h7 Kh1 h8=Q+ Kg1 Qh2#
- e4 Kg1 e5 Kh1 e6 Kg1 e7 Kh1 e8=Q Kg1 Qe1#
promotion excelsior excelsior:white switchback single-piece single-piece:white single-piece:black pendulum nocapture