h#7
kQ5N/8/8/8/8/8/7N/3K4 b - - 0 1
- Kxb8 Ke2 Kc7 Kf3 Kd6 Kg4 Ke5 Kh5 Kf4 Ng6+ Kg3 Nf1+ Kh3 Nf4#
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.
KQNNvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 3
- positions at that depth
- h#7
- deepest dual
- h#3
- deepest strict dual
- 79,661,841
- positions with a helpmate
- 11,060,743
- with a unique solution
- 121,110,528
- cells in the plane
- 71,280,615 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
h#7
3N2kQ/8/8/8/8/8/3N4/3K4 b - - 0 1
- Kxh8 Ke2 Kg7 Kf3 Kf6 Kg4 Ke5 Kh5 Kf4 Ne6+ Kg3 Nf1+ Kh3 Nf4#
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.
Deepest dual problems
Deepest dual with different first and last moves: h#3. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#3
NN6/8/8/8/8/3Q4/8/K2k4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc1 Qd4 Kc2 Nb6 Kb3 Qb2#
- Ke1 Nc6 Kf2 Nd4 Ke1 Qe2#
pure switchback single-piece single-piece:black nocapture nocheck
Note: the side to move is in check in the diagram.
h#3
5N1N/8/8/8/Q7/8/8/K3k3 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd2 Ka2 Kc1 Ka3 Kb1 Qd1#
- Ke2 Ne6 Kd2 Nd4 Kc1 Qc2#
set-play pure mirror single-piece single-piece:black nocapture nocheck
h#3
1N6/8/N7/8/2Q5/8/8/K5k1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf2 Kb2 Ke1 Kc3 Kd1 Qf1#
- Kg2 Nc6 Kf2 Nd4 Ke1 Qe2#
set-play pure mirror single-piece single-piece:black nocapture nocheck