h#7
8/K7/8/8/6N1/4N3/4P3/6k1 b - - 0 1
- Kh1 Nf5 Kg2 e4 Kf3 e5 Kf4 e6 Kg5 e7 Kg6 e8=Q+ Kh7 Nf6#
set-play mirror promotion excelsior excelsior:white single-piece single-piece:black nocapture
KNNPvk
5 pieces.
- h#8
- longest mate
- h#7
- deepest unique
- 5
- positions at that depth
- h#7
- deepest dual
- h#6.5
- deepest strict dual
- 279,624,065
- positions with a helpmate
- 9,767,636
- with a unique solution
- 355,074,048
- cells in the plane
- 224,159,747 bytes
- on disk
Deepest unique problems
Only 2 distinct ideas exist at this depth.
h#7
8/8/8/8/8/5N2/K4PN1/7k 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#6.5. The deepest dual overall is h#7, where the two solutions share a first or a last move.
h#6.5
7k/8/8/8/8/1N1N4/K2P4/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ne1 Kg7 d4 Kf6 d5 Ke5 d6 Kd5 d7 Kc4 d8=Q Kc3 Qd4#
- Ne5 Kg7 d4 Kf6 d5 Kxe5 d6 Ke4 d7 Kd3 d8=Q+ Kc2 Qd2#
promotion excelsior excelsior:white closed-walk single-piece single-piece:black umnov
h#6.5
1KN5/6N1/8/8/8/8/P7/7k w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- a3 Kg2 a4 Kf3 a5 Ke4 a6 Kd5 a7 Kc6 a8=Q+ Kd7 Qd5#
- a4 Kg2 a5 Kf3 a6 Ke4 a7 Kd5 a8=R Kc6 Ra6+ Kd7 Rd6#
set-play promotion underpromotion excelsior excelsior:white closed-walk single-piece single-piece:white single-piece:black nocapture
h#6.5
7k/8/8/4N3/8/3K4/3P4/N7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke2 Kg7 d4 Kf6 d5 Kf5 d6 Ke4 d7 Kd4 d8=Q+ Kc3 Qd2#
- Ke3 Kg7 d4 Kf6 d5 Kxe5 d6 Kd5 d7 Kc4 d8=Q Kc3 Qd4#
promotion excelsior excelsior:white closed-walk single-piece single-piece:black umnov