h#6
4kR2/7R/8/8/8/8/6r1/1K6 b - - 0 1
- Kxf8 Kc1 Rg7 Kd2 Kf7 Ke3 Kg6 Rxg7+ Kh5 Kf4 Kh4 Rh7#
pure model ideal mirror switchback
Note: the side to move is in check in the diagram; the solution begins with a capture.
KRRvkr
5 pieces.
- h#7
- longest mate
- h#6
- deepest unique
- 1
- positions at that depth
- h#6
- deepest dual
- h#3.5
- deepest strict dual
- 72,578,329
- positions with a helpmate
- 7,338,322
- with a unique solution
- 121,110,528
- cells in the plane
- 37,283,688 bytes
- on disk
Deepest unique problems
Only one position exists at this depth.
Deepest dual problems
Deepest dual with different first and last moves: h#3.5. The deepest dual overall is h#6, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#3.5
8/7R/5k2/7R/8/8/r7/K7 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kb1 Kg6 Rh1 Rh2 Rg7+ Kh5 Rxh2#
- Kxa2 Ke6 Kb3 Kd6 Kc4 Kc6 R5h6#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram.