h#7
8/8/8/8/8/6N1/R5P1/1k1K4 b - - 0 1
- Kxa2 Ne2 Kb3 g4 Kc4 g5 Kd3 g6 Ke3 g7 Kf2 g8=Q Kf1 Qg1#
promotion excelsior excelsior:white single-piece single-piece:black nocheck
Note: the solution begins with a capture.
KRNPvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 31
- positions at that depth
- h#7
- deepest dual
- h#5
- deepest strict dual
- 525,960,046
- positions with a helpmate
- 51,384,328
- with a unique solution
- 355,074,048
- cells in the plane
- 348,712,148 bytes
- on disk
Deepest unique problems
h#7
8/8/8/8/8/N7/P5R1/3K1k2 b - - 0 1
- Kxg2 Nc2 Kf3 a4 Ke4 a5 Kd3 a6 Kc3 a7 Kb2 a8=Q Kb1 Qa1#
promotion excelsior excelsior:white single-piece single-piece:black nocheck
Note: the solution begins with a capture.
h#7
8/8/8/8/8/5N2/K4PR1/7k 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 solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#5
1K6/8/8/8/5R2/1P6/6k1/3N4 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kg1 Nf2 Kf1 Kc7 Ke2 Kd6 Ke3 Rf3+ Kd4 Rd3#
- Kg3 Ra4 Kf3 b4 Ke4 Kc8 Kd5 Nc3+ Kc6 Ra6#
set-play pure model ideal mirror single-piece single-piece:black nocapture