h#6
8/6N1/8/8/8/2B5/2R5/K2k4 b - - 0 1
- Kxc2 Ka2 Kc1 Kb3 Kb1 Kc4 Ka2 Ne6 Ka3 Bb4+ Ka4 Nc5#
single-piece single-piece:black
Note: the solution begins with a capture.
KRBNvk
5 pieces.
- h#8
- longest mate
- h#6
- deepest unique
- 36
- positions at that depth
- h#7
- deepest dual
- h#4.5
- deepest strict dual
- 167,416,792
- positions with a helpmate
- 23,825,336
- with a unique solution
- 121,110,528
- cells in the plane
- 132,642,469 bytes
- on disk
Deepest unique problems
h#6
6R1/7N/7k/8/8/8/8/K2B4 b - - 0 1
- Kxh7 Kb2 Kh6 Kc3 Kh7 Kd4 Kh6 Ke5 Kh7 Kf6 Kh6 Rh8#
mirror switchback single-piece single-piece:black pendulum nocheck
Note: the solution begins with a capture.
h#6
8/6N1/8/8/R7/1k6/1B6/1K6 b - - 0 1
- Kxa4 Bc3 Ka3 Kc2 Ka2 Kd3 Kb1 Nf5 Kc1 Bd2+ Kd1 Ne3#
single-piece single-piece:black
Note: 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#7, where the two solutions share a first or a last move.
h#4.5
8/6k1/8/4R3/8/8/8/NK5B w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ra5 Kf6 Bd5 Ke5 Kc1 Kd4 Nc2+ Kc3 Ra3#
- Rb5 Kf6 Bd5 Ke5 Kc1 Kd4 Nc2+ Kc3 Rb3#
h#4.5
5Bk1/5R2/8/8/8/8/8/N1K5 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rf1 Kh7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh1#
- Rf2 Kh7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh2#
pure mirror single-piece single-piece:black nocapture nocheck
h#4.5
7k/6R1/8/8/8/8/8/N1K3B1 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rg2 Kh7 Kd2 Kh6 Ke3 Kh5 Kf4 Kh4 Rh2#
- Rg8+ Kh7 Kd2 Kh6 Ke3 Kh5 Kf4 Kh4 Rh8#