h#7
2K5/8/8/8/8/4N1Bk/4P3/8 b - - 0 1
- Kxg3 Nd5 Kf2 e4 Ke2 e5 Kd3 e6 Kc4 e7 Kb5 e8=Q+ Ka6 Qa4#
pure model ideal mirror promotion excelsior excelsior:white single-piece single-piece:black umnov
Note: the solution begins with a capture.
KBNPvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 9
- positions at that depth
- h#7
- deepest dual
- h#6
- deepest strict dual
- 546,180,359
- positions with a helpmate
- 25,295,909
- with a unique solution
- 355,074,048
- cells in the plane
- 440,972,685 bytes
- on disk
Deepest unique problems
h#7
8/8/8/8/8/5N2/K4PB1/7k b - - 0 1
- Kxg2 Nd4 Kf1 f4 Ke1 f5 Kd2 f6 Kc3 f7 Kb4 f8=Q+ Ka4 Qa3#
promotion excelsior excelsior:white single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#7
k1K5/N7/8/8/2B5/8/2P5/8 b - - 0 1
- Kxa7 Bd5 Kb6 c4 Kc5 Kb7 Kd6 Ka6 Kc7 c5 Kb8 c6 Ka8 c7#
mirror closed-walk single-piece single-piece:black nocheck
Note: the solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#6. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#6
8/6N1/8/8/8/2B3P1/2k5/K7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd1 Ka2 Kc1 Kb3 Kb1 Kc4 Ka2 Ne6 Ka3 Bb4+ Ka4 Nc5#
- Kb3 Kb1 Ka3 Kc2 Ka2 Kd3 Kb1 Nf5 Kc1 Bd2+ Kd1 Ne3#
h#6
7N/8/8/8/3B4/8/4kP2/K7 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kd3 f4 Ke4 f5 Kf4 f6 Kg5 f7 Kh6 f8=Q+ Kh7 Qg7#
- Kf3 Ng6 Kg4 f4 Kh5 f5 Kh6 f6 Kh7 Nf8+ Kh8 f7#
set-play pure model mirror promotion excelsior excelsior:white single-piece single-piece:white single-piece:black nocapture umnov
h#6
5Bk1/5N2/8/8/8/8/4P3/2K5 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kh7 Bd6 Kg7 Kd2 Kg6 Ke3 Kh5 Kf3 Kh4 Bg3+ Kh3 Ng5#
- Kxf7 e4 Ke6 e5 Kd5 e6 Kc4 e7 Kb3 e8=Q Ka2 Qa4#
set-play pure model mirror promotion excelsior excelsior:white single-piece single-piece:white single-piece:black umnov