h#7
5B2/5B1k/8/8/8/8/7B/K7 b - - 0 1
- Kh8 Kb2 Kh7 Kc3 Kh8 Kd4 Kh7 Ke5 Kh8 Kf6 Kh7 Be5 Kh8 Kg6#
set-play mirror switchback single-piece single-piece:black pendulum nocapture nocheck
KBBBvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 3
- positions at that depth
- h#7
- deepest dual
- h#5
- deepest strict dual
- 21,024,540
- positions with a helpmate
- 1,742,417
- with a unique solution
- 121,110,528
- cells in the plane
- 18,754,392 bytes
- on disk
Deepest unique problems
Only one distinct idea exists at this depth: 3 positions share a solution.
Deepest dual problems
Deepest dual with different first and last moves: h#5. 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#5
5BkB/8/6B1/8/8/8/8/3K4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxf8 Bf5 Kf7 Bg4 Kg6 Ke2 Kg5 Kf3 Kh4 Bf6#
- Kxh8 Bh5 Kh7 Bg4 Kg6 Ke2 Kg5 Kf3 Kh4 Be7#
set-play pure model ideal single-piece single-piece:black nocheck zilahi
Note: the solution begins with a capture.