h#8
8/8/8/8/8/8/5r1N/K5Qk b - - 0 1
- Kxg1 Nf3+ Kf1 Kb1 Ke2 Kb2 Kd3+ Kc1 Kc3 Kd1 Kb2 Nd4 Ka1 Kc1 Ra2 Nb3#
pure model ideal switchback self-block
Note: the side to move is in check in the diagram; the solution begins with a capture.
KQNvkr
5 pieces.
- h#10
- longest mate
- h#8
- deepest unique
- 11
- positions at that depth
- h#8
- deepest dual
- h#3.5
- deepest strict dual
- 144,279,218
- positions with a helpmate
- 13,071,638
- with a unique solution
- 121,110,528
- cells in the plane
- 107,116,379 bytes
- on disk
Deepest unique problems
h#8
8/8/N5Qk/8/8/8/4r3/1K6 b - - 0 1
- Kxg6 Nb4 Kf5 Nc2 Ke4 Kb2 Kd3 Kc1 Kc3 Kd1 Kb2 Nd4 Ka1 Kc1 Ra2 Nb3#
pure model ideal switchback self-block nocheck
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#8
kN6/Q7/1r6/8/8/8/8/2K5 b - - 0 1
- Kxa7 Nc6+ Ka6 Kc2 Kb5 Kb2 Kc4+ Ka3 Kc3 Ka4 Kb2 Nd4 Ka1 Ka3 Rb1 Nc2#
pure model ideal switchback self-block
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#3.5. The deepest dual overall is h#8, where the two solutions share a first or a last move.
h#3.5
8/N7/8/8/6k1/8/r4Q2/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Ra5 Nc6 Rg5 Ne5+ Kh5 Qh2#
- Qxa2 Kf3 Kb2 Ke2 Kc3+ Kd1 Qd2#
pure model self-block single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#3.5
N7/r7/8/5k2/8/8/4Q3/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb2 Kf4 Qf1+ Ke3 Nb6 Kd2 Nc4#
- Qa2 Kf6 Nb6 Ke7 Qxa7+ Kd8 Qd7#
mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#3.5
8/8/8/5k2/1Q6/8/1N6/Kr6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ka2 Ke5 Qb5+ Kd4 Ka3 Kc3 Qd3#
- Kxb1 Ke5 Qb5+ Kd4 Kc1 Kc3 Qc4#
single-piece single-piece:black
Note: the side to move is in check in the diagram.