h#6
8/8/7k/6R1/8/1p6/8/K7 b - - 0 1
- Kh7 Kb2 Kh8 Kc3 b2 Kd4 b1=R Ke5 Rb8 Kf6 Rg8 Rh5#
set-play pure model ideal promotion underpromotion self-block nocapture nocheck umnov
KRvkp
4 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 84
- positions at that depth
- h#6
- deepest dual
- h#4.5
- deepest strict dual
- 9,027,512
- positions with a helpmate
- 566,811
- with a unique solution
- 5,548,032
- cells in the plane
- 3,664,243 bytes
- on disk
Deepest unique problems
h#6
K7/8/8/3p4/8/8/4R3/6k1 b - - 0 1
- d4 Kb7 d3 Kc6 d2 Kd5 d1=Q+ Ke4 Qd6 Kf3 Qh2 Re1#
pure model ideal promotion self-block single-piece single-piece:black nocapture
h#6
8/7k/6R1/8/p7/8/8/K7 b - - 0 1
- Kh8 Kb2 a3+ Kc3 a2 Kd4 a1=R Ke5 Ra8 Kf6 Rg8 Rh6#
pure model ideal promotion underpromotion self-block nocapture
Deepest dual problems
Deepest dual with different first and last moves: h#4.5. The deepest dual overall is h#6, where the two solutions share a first or a last move.
h#4.5
8/8/8/8/8/3p3k/2R5/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb2 d2 Kc3 Kg2 Kxd2 Kf1 Ke3 Ke1 Rc1#
- Ra2 Kg3 Kb2 Kf2 Kc3+ Ke1 Kxd3 Kd1 Ra1#
h#4.5
8/8/8/8/7k/1p6/1R6/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Kg3 Rxb3+ Kf2 Kc2 Ke1 Kd3 Kd1 Rb1#
- Ra2 Kg3 Kb2 Kf2 Kc3+ Ke1 Kd3 Kd1 Ra1#
h#4.5
8/4k3/2R5/8/8/2p5/8/2K5 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rc7+ Kf6 Kd1 Kg5 Ke2 Kh4 Kf3 Kh3 Rh7#
- Rc8 Kf6 Kd1 Kg5 Ke2 Kh4 Kf3 Kh3 Rh8#