h#7
7R/7k/7B/8/8/8/2B5/K7 b - - 0 1
- Kxh8 Kb2 Kg8 Kc3 Kf7 Kd3 Kg6 Ke4 Kh5 Kf5 Kh4 Bg5+ Kh5 Bd1#
switchback single-piece single-piece:black
Note: the diagram has no legal last move, so it cannot arise in a game.
KRBBvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 1
- positions at that depth
- h#6
- deepest dual
- h#5
- deepest strict dual
- 81,577,263
- positions with a helpmate
- 13,774,946
- with a unique solution
- 121,110,528
- cells in the plane
- 76,428,508 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. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#5
8/8/5k2/4R3/8/8/1B6/K5B1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kg6 Re1 Kf5 Be3 Ke4 Ka2 Kd3 Rd1+ Kc2 Rd2#
- Kf7 Ra5 Ke6 Bc5 Kd5 Kb1 Kc4 Ra4+ Kb3 Rb4#
set-play pure model ideal single-piece single-piece:black nocapture
h#5
7k/8/7B/8/5B2/5R2/8/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Kc2 Kg6 Kd3 Kh5 Ke4 Kh4 Kf5 Kh5 Rh3#
- Kg8 Kc2 Kf7 Bd2+ Ke6 Bhe3 Kd5 Rf5+ Kc4 Rc5#
h#5
5B1k/8/7B/8/8/2R5/1K6/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Kc2 Kg6 Kd3 Kh5 Ke4 Kh4 Kf5 Kh5 Rh3#
- Kg8 Kb3 Kf7 Kc4 Ke8 Kd5 Kd8 Ke6 Ke8 Rc8#
switchback single-piece single-piece:black nocapture nocheck