h#6.5
7k/8/7B/8/8/8/1qB5/K7 w - - 0 1
- Kxb2 Kg8 Kc3 Kf7 Kd3 Kg6 Ke4 Kh5 Kf5 Kh4 Bg5+ Kh5 Bd1#
switchback single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
KBBvkq
5 pieces.
- h#7.5
- longest mate
- h#6.5
- deepest unique
- 3
- positions at that depth
- h#6.5
- deepest dual
- h#5
- deepest strict dual
- 36,225,815
- positions with a helpmate
- 1,189,370
- with a unique solution
- 121,110,528
- cells in the plane
- 30,330,491 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
h#6.5
5B1k/8/8/8/8/1B6/1q6/1K6 w - - 0 1
- Kxb2 Kh7 Kc3 Kg6 Kc4 Kf7 Kd5 Ke8 Ke6 Kd8 Be7+ Ke8 Ba4#
switchback single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#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
5k2/6B1/8/8/8/8/2B2q2/3K4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke7 Kc1 Kd6 Kb1 Kc5 Bd4+ Kb4 Bxf2 Ka3 Bc5#
- Kf7 Bf5 Qa7 Bg4 Kg6 Ke2 Kg5 Kf3 Kh4 Bf6#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.