h#5
8/2r5/8/8/8/1p5k/6Q1/K7 b - - 0 1
- Kh4 Qc6 Kg3 Kb2 Kf2 Kc3 Ke1 Kd3 Kd1 Qh1#
pure model mirror single-piece single-piece:black nocapture nocheck
Note: the side to move is in check in the diagram.
KQvkrp
5 pieces.
- h#6.5
- longest mate
- h#5
- deepest unique
- 631
- positions at that depth
- h#5
- deepest dual
- h#4.5
- deepest strict dual
- 440,558,544
- positions with a helpmate
- 20,712,441
- with a unique solution
- 355,074,048
- cells in the plane
- 254,663,548 bytes
- on disk
Deepest unique problems
h#5
8/8/8/5r2/6k1/p5Q1/8/K7 b - - 0 1
- Kh5 Qxa3 Kg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
switchback single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#5
8/8/8/8/5rk1/2p4Q/8/K7 b - - 0 1
- Kg5 Qh2 Kf5 Kb1 Ke4 Kc1 Kd3 Kd1 Rd4 Qe2#
Note: the side to move is in check in the diagram.
Chosen from the first 500 of 631 positions at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#4.5. The deepest dual overall is h#5, where the two solutions share a first or a last move.
h#4.5
8/5p2/8/8/7k/1r6/8/K2Q4 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Qe2 Rg3 Kb2 Rg6 Kc3 Kg5 Kd4 Kf6 Qe5#
- Qxb3 Kg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
h#4.5
8/8/8/p7/7k/r1Q5/8/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Ra4 Qb2 Kg3 Kc2 Kf2 Kd3+ Ke1 Qe2#
- Qxa3 Kg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#4.5
8/8/8/8/2p4k/1r1Q4/8/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Qxc4+ Kg3 Ka2 Kf2 Kxb3 Ke1 Kc3 Kd1 Qf1#
- Qxb3 Kg4 Qa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
pure model ideal mirror single-piece single-piece:black
Note: the solution begins with a capture.