h#7
7k/8/8/7N/8/8/8/K2B3b b - - 0 1
- Kh7 Kb2 Kg6 Nf4+ Kf5 Nd3 Ke4 Bf3+ Ke3 Bxh1 Ke2 Kc3 Kd1 Bf3#
pure model ideal mirror switchback single-piece single-piece:black
KBNvkb
5 pieces.
- h#11
- longest mate
- h#7
- deepest unique
- 7
- positions at that depth
- h#7
- deepest dual
- h#5.5
- deepest strict dual
- 170,896,761
- positions with a helpmate
- 3,196,125
- with a unique solution
- 121,110,528
- cells in the plane
- 110,572,830 bytes
- on disk
Deepest unique problems
h#7
7k/7N/8/8/8/8/2b5/K4B2 b - - 0 1
- Kg7 Ng5 Kf6 Kb2 Ke5 Kc1 Kd4 Nf3+ Kc3 Ne1 Kb3 Nxc2 Ka2 Bc4#
h#7
7k/1b6/8/7N/8/8/8/K2B4 b - - 0 1
- Kh7 Kb2 Kg6 Nf4+ Kf5 Nd3 Ke4 Bf3+ Ke3 Bxb7 Ke2 Kc3 Kd1 Bf3#
pure model ideal mirror switchback single-piece single-piece:black
Deepest dual problems
Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#5.5
8/6N1/5k2/8/8/2b5/8/K6B w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Ke5 Kc1 Kd4 Nf5+ Kc4 Ne3+ Kb3 Nc2 Ka2 Bd5#
- Ka2 Ke5 Ka3 Kd4 Ne6+ Kd3 Nc5+ Kc2 Nb3 Kb1 Be4#
pure model mirror single-piece single-piece:black nocapture
Note: the side to move is in check in the diagram.
h#5.5
8/N7/5k2/8/8/3B4/1b6/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ka2 Ke5 Kb3 Kd4 Ka4 Kc3 Ka5 Kb3 Bc4+ Ka3 Nb5#
- Kxb2 Ke5 Kc1 Kd4 Nc6+ Kc3 Nb4 Kb3 Nc2 Ka2 Bc4#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.
h#5.5
8/8/6k1/8/8/8/B2N4/Kb6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bf7+ Kf5 Nb3 Ke4 Kxb1 Kd3 Ka2 Kc2 Ka3 Kb1 Bg6#
- Bg8 Kf5 Nb3 Ke4 Kxb1 Kd3 Ka2 Kc2 Ka3 Kb1 Bh7#
pure model ideal mirror single-piece single-piece:black kniest