h#9
N7/8/8/8/6k1/4p3/4P3/K7 b - - 0 1
- Kg3 Nb6 Kf2 Nc4 Ke1 Nd2 exd2 e4 Kd1 e5 Kc1 e6 d1=R e7 Rd2 e8=Q Rc2 Qe1#
promotion underpromotion excelsior excelsior:white switchback self-block nocheck
KNPvkp
5 pieces.
- h#14
- longest mate
- h#9
- deepest unique
- 9
- positions at that depth
- h#9
- deepest dual
- h#7.5
- deepest strict dual
- 428,015,126
- positions with a helpmate
- 8,465,982
- with a unique solution
- 266,305,536
- cells in the plane
- 291,480,470 bytes
- on disk
Deepest unique problems
h#9
8/7k/7N/8/8/1p6/1P6/1K6 b - - 0 1
- Kg6 Ng4 Kf5 Kc1 Ke4 Kd1 Kd3 Ke1 Kc2 Ne3+ Kxb2 Kd2 Ka1 Kc3 b2 Kb3 b1=N Nc2#
Deepest dual problems
Deepest dual with different first and last moves: h#7.5. The deepest dual overall is h#9, where the two solutions share a first or a last move.
h#7.5
8/7k/5p2/8/8/6N1/2K2P2/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ne4 Kh8 Ng5 fxg5 f4 g4 f5 g3 f6 g2 f7 g1=R f8=Q+ Rg8 Qh6#
- f4 f5 Nxf5 Kg6 Ne3 Kh5 f5 Kh4 f6 Kg3 f7 Kf2 f8=Q+ Ke1 Qf1#
pure model promotion underpromotion excelsior excelsior:white self-block
h#7.5
8/8/8/3K1p2/8/5P1N/6k1/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Nf2 Kg3 Ng4 fxg4 fxg4 Kf4 g5 Kf5 g6 Kf6 g7 Kf7 Kd6 Ke8 g8=Q#
- Ng5 Kh1 Ne4 fxe4 f4 e3 f5 e2 f6 e1=R f7 Re2 f8=Q Rh2 Qf1#
pure model ideal mirror promotion underpromotion switchback self-block nocheck
h#7.5
8/8/8/2K2p2/8/3N4/5Pk1/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ne5 Kh1 Ng4 fxg4 f4 g3 f5 g2 f6 g1=R f7 Rg2 f8=Q Rh2 Qf1#
- f4 Kf3 Ne5+ Ke4 Ng4 fxg4 f5 Ke5 f6 Ke6 f7 Ke7 Kc6 Kd8 f8=Q#
pure model mirror promotion underpromotion excelsior excelsior:white switchback self-block umnov