h#6
7R/7k/8/6Q1/8/8/1n6/K7 b - - 0 1
- Kxh8 Kxb2 Kh7 Kc3 Kh8 Kd4 Kh7 Ke5 Kh8 Kf6 Kh7 Qg7#
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.
KQRvkn
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 4
- positions at that depth
- h#6
- deepest dual
- h#5
- deepest strict dual
- 147,164,248
- positions with a helpmate
- 16,102,857
- with a unique solution
- 121,110,528
- cells in the plane
- 95,439,528 bytes
- on disk
Deepest unique problems
h#6
7k/7R/8/6Q1/8/2n5/8/K7 b - - 0 1
- Kxh7 Kb2 Kh8 Kxc3 Kh7 Kd4 Kh8 Ke5 Kh7 Kf6 Kh8 Qg7#
pure model ideal 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
7R/7k/8/6Q1/8/2n5/8/K7 b - - 0 1
- Kxh8 Kb2 Kh7 Kxc3 Kh8 Kd4 Kh7 Ke5 Kh8 Kf6 Kh7 Qg7#
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#5. 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#5
4kQ2/8/3R2n1/8/8/8/8/2K5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxf8 Kd2 Kg7 Ke3 Kh6 Rxg6+ Kh5 Kf4 Kh4 Rh6#
- Nxf8 Rd1 Kf7 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh1#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.