h#7
5B1N/7k/8/8/8/1B6/8/K7 b - - 0 1
- Kxh8 Kb2 Kh7 Kc3 Kg6 Kc4 Kf7 Kd5 Ke8 Ke6 Kd8 Be7+ Ke8 Ba4#
switchback single-piece single-piece:black
Note: the solution begins with a capture.
KBBNvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 1
- positions at that depth
- h#6.5
- deepest dual
- h#5.5
- deepest strict dual
- 86,461,822
- positions with a helpmate
- 4,122,196
- with a unique solution
- 121,110,528
- cells in the plane
- 58,514,796 bytes
- on disk
Deepest unique problems
Only one position exists at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#6.5, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#5.5
5k1N/8/5B2/8/8/8/2K5/B7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ng6+ Kf7 Kd3 Kg8 Ke4 Kh7 Kf5 Kh6 Bg5+ Kh5 Nf4#
- Bg7+ Ke7 Ng6+ Kd6 Nf4 Kc5 Ne2 Kb4 Nc3 Ka3 Bf8#