h#6
7k/8/7B/8/8/8/1r6/KB6 b - - 0 1
- Rb8 Ka2 Ra8+ Kb3 Kg8 Kc4 Kf7 Kd5 Ke8 Ke6 Rd8 Bg6#
KBBvkr
5 pieces.
- h#7.5
- longest mate
- h#6
- deepest unique
- 28
- positions at that depth
- h#6
- deepest dual
- h#5
- deepest strict dual
- 39,627,428
- positions with a helpmate
- 1,451,631
- with a unique solution
- 121,110,528
- cells in the plane
- 30,472,200 bytes
- on disk
Deepest unique problems
h#6
8/7k/8/5B2/8/4B3/6r1/K7 b - - 0 1
- Kg7 Kb1 Rg5 Kc2 Kh6 Kd3 Kh5 Ke4 Kh4 Kf4 Rh5 Bf2#
Note: the side to move is in check in the diagram.
h#6
7k/4r3/8/4B2B/8/8/8/K7 b - - 0 1
- Kg8 Kb2 Kf8 Kc3 Rc7+ Kd4 Ke7 Kd5 Kd8 Kd6 Rc8 Bf6#
Note: the side to move is in check in the diagram.
Deepest dual problems
Deepest dual with different first and last moves: h#5. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#5
8/5k1B/8/1r6/8/8/8/2K3B1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke6 Bd4 Kd5 Bb2 Kc4 Bd3+ Kb3 Bxb5 Ka2 Bc4#
- Kf6 Kd2 Kg5 Ke3 Kh4 Kf4 Rg5 Bf5 Rh5 Bf2#
h#5
1BB5/5k2/8/8/8/8/3r4/2K5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke7 Ba7 Kd6 Be3 Kc6 Bxd2 Kb5 Kb2 Ka4 Bd7#
- Rg2 Kd1 Rg5 Ke2 Kg6 Kf3 Kh5 Bg4+ Kh4 Bg3#
pure model ideal mirror self-block single-piece single-piece:black