h#6
7Q/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.
KQQvkn
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 4
- positions at that depth
- h#6
- deepest dual
- h#4
- deepest strict dual
- 68,926,578
- positions with a helpmate
- 10,425,560
- with a unique solution
- 121,110,528
- cells in the plane
- 58,155,332 bytes
- on disk
Deepest unique problems
h#6
7k/7Q/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
7Q/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#4. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#4
8/8/8/8/6Q1/4n2k/1Q6/K7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
- Nxg4 Kb1 Kg3 Kc2 Kf2 Kd3+ Ke1 Qe2#
single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#4
8/8/6Q1/8/7k/7Q/8/1K4n1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxh3 Qb6 Kg2 Kc2 Kf1 Kd3 Ke1 Qxg1#
- Nxh3 Qh5+ Kg3 Kc2 Kf2 Kd3 Ke1 Qe2#
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.