h#6
6R1/8/7k/8/8/8/8/K2B4 b - - 0 1
- Kh7 Kb2 Kh6 Kc3 Kh7 Kd4 Kh6 Ke5 Kh7 Kf6 Kh6 Rh8#
set-play mirror switchback single-piece single-piece:black pendulum nocapture nocheck
KRBvk
4 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 20
- positions at that depth
- h#6
- deepest dual
- h#4.5
- deepest strict dual
- 2,868,775
- positions with a helpmate
- 277,519
- with a unique solution
- 1,892,352
- cells in the plane
- 1,887,084 bytes
- on disk
Deepest unique problems
h#6
7k/5R2/8/8/6B1/8/8/1K6 b - - 0 1
- Kg8 Kc2 Kh8 Kd3 Kg8 Ke4 Kh8 Kf5 Kg8 Kg6 Kh8 Rf8#
pure mirror switchback single-piece single-piece:black pendulum nocapture nocheck
h#6
7k/8/8/8/7B/6R1/8/K7 b - - 0 1
- Kh7 Kb2 Kh6 Kc3 Kh5 Kd4 Kxh4 Ke5 Kh5 Kf6 Kh6 Rh3#
set-play pure model ideal mirror switchback single-piece single-piece:black nocheck
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
8/8/8/5B1k/8/8/R7/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Bb1 Kg4 Kb2 Kf3 Ra1 Ke2 Kc3 Kd1 Bd3#
- Bc2 Kg4 Kb2 Kf3 Kc3 Ke2 Bd3+ Kd1 Ra1#
h#4.5
8/B7/8/7k/6R1/8/8/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Rg5+ Kh4 Rc5 Kg3 Kc2 Kf2 Kd3 Ke1 Rc1#
- Rg6 Kh4 Rb6 Kg3 Kc2 Kf2 Kd3 Ke1 Rb1#
pure model ideal mirror single-piece single-piece:black nocapture
h#4.5
4k3/8/4B3/8/8/8/1R6/1K6 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc2 Kf8 Kd3 Kg7 Ke4 Kh6 Kf5 Kh5 Rh2#
- Bb3 Kd7 Kc2 Kc6 Kc3 Kb5 Bc4+ Ka4 Ra2#