h#6
8/7R/7k/8/7B/6R1/8/K7 b - - 0 1
- Kxh7 Kb2 Kh6 Kc3 Kh5 Kd4 Kxh4 Ke5 Kh5 Kf6 Kh6 Rh3#
pure model ideal mirror switchback single-piece single-piece:black nocheck
Note: the side to move is in check in the diagram; the solution begins with a capture.
KRRBvk
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 17
- positions at that depth
- h#6
- deepest dual
- h#4
- deepest strict dual
- 78,650,821
- positions with a helpmate
- 11,535,041
- with a unique solution
- 121,110,528
- cells in the plane
- 39,659,811 bytes
- on disk
Deepest unique problems
h#6
6Rk/5R2/8/8/6B1/8/8/1K6 b - - 0 1
- Kxg8 Kc2 Kh8 Kd3 Kg8 Ke4 Kh8 Kf5 Kg8 Kg6 Kh8 Rf8#
pure mirror switchback single-piece single-piece:black pendulum nocheck
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#6
7k/7R/6R1/8/8/8/B7/K7 b - - 0 1
- Kxh7 Kb2 Kh8 Kc3 Kh7 Kd4 Kh8 Ke5 Kh7 Kf6 Kh8 Rh6#
pure model ideal mirror switchback single-piece single-piece:black pendulum nocheck
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#4. The deepest dual overall is h#6, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#4
8/8/3R4/4k3/4R3/7B/8/1K6 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxe4 Kc2 Kf3 Kd3 Kf2 Rf6+ Ke1 Rf1#
- Kxd6 Rh4 Kc5 Bg4 Kb4 Bd1+ Ka3 Ra4#
pure model ideal single-piece single-piece:black zilahi
Note: the side to move is in check in the diagram; the solution begins with a capture.