h#6
8/6N1/8/8/8/2B5/8/K2k4 b - - 0 1
- Kc2 Ka2 Kc1 Kb3 Kb1 Kc4 Ka2 Ne6 Ka3 Bb4+ Ka4 Nc5#
KBNvk
4 pieces.
- h#8
- longest mate
- h#6
- deepest unique
- 23
- positions at that depth
- h#7
- deepest dual
- h#6
- deepest strict dual
- 3,064,718
- positions with a helpmate
- 70,745
- with a unique solution
- 1,892,352
- cells in the plane
- 2,196,902 bytes
- on disk
Deepest unique problems
h#6
8/6Nk/8/8/4B3/8/8/K7 b - - 0 1
- Kh6 Kb2 Kg5 Kc3 Kf4 Ne6+ Ke3 Nc5 Ke2 Nd3 Kd1 Bf3#
pure model ideal mirror single-piece single-piece:black nocapture
Note: the side to move is in check in the diagram.
h#6
8/7k/8/1N6/8/8/6B1/1K6 b - - 0 1
- Kg6 Ka2 Kf5 Bh3+ Ke4 Nd4 Kd3 Nb3 Kc2 Ka3 Kb1 Bf5#
pure model ideal mirror single-piece single-piece:black nocapture
Deepest dual problems
Deepest dual with different first and last moves: h#6. The deepest dual overall is h#7, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#6
8/6N1/8/8/8/2B5/2k5/K7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd1 Ka2 Kc1 Kb3 Kb1 Kc4 Ka2 Ne6 Ka3 Bb4+ Ka4 Nc5#
- Kb3 Kb1 Ka3 Kc2 Ka2 Kd3 Kb1 Nf5 Kc1 Bd2+ Kd1 Ne3#