h#7
7k/8/5r2/8/N7/8/8/KB6 b - - 0 1
- Kg7 Ba2 Kg6 Kb2 Kf5 Ka3 Ke4 Bd5+ Kd3 Nc5+ Kc2 Nb3 Kb1 Be4#
KBNvkr
5 pieces.
- h#9
- longest mate
- h#7
- deepest unique
- 2
- positions at that depth
- h#7
- deepest dual
- h#6.5
- deepest strict dual
- 163,353,596
- positions with a helpmate
- 2,722,890
- with a unique solution
- 121,110,528
- cells in the plane
- 92,751,214 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
h#7
4N2k/1r6/8/8/8/8/8/K4B2 b - - 0 1
- Kg8 Ba6 Kf7 Nd6+ Ke6 Nc4 Kd5 Bxb7+ Kc5 Kb2 Kb5 Kc3 Ka4 Bc6#
Deepest dual problems
Deepest dual with different first and last moves: h#6.5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
Only 2 distinct ideas exist at this depth.
h#6.5
8/6k1/5r2/8/8/7B/8/K4N2 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nd2 Kg6 Bf1 Kf5 Nb3 Ke4 Bg2+ Kd3 Ka2 Kc2 Ka3 Kb1 Be4#
- Ne3 Kf7 Bf1 Ke6 Nc2 Kd5 Bg2+ Kc4 Kb1 Kb3 Kc1 Ka2 Bd5#
h#6.5
8/7k/8/1N6/8/8/6r1/K6B w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nd4 Kg6 Nb3 Kf5 Kb1 Ke4 Bxg2+ Kd3 Ka2 Kc2 Ka3 Kb1 Be4#
- Bxg2 Kg6 Ka2 Kf5 Bh3+ Ke4 Nd4 Kd3 Nb3 Kc2 Ka3 Kb1 Bf5#