KRRvkb
5 pieces.
- h#7
- longest mate
- h#5
- deepest unique
- 290
- positions at that depth
- h#5
- deepest dual
- h#4
- deepest strict dual
- 76,335,540
- positions with a helpmate
- 7,703,911
- with a unique solution
- 121,110,528
- cells in the plane
- 49,638,991 bytes
- on disk
Deepest unique problems
h#5
8/8/8/8/7k/3b3R/6R1/K7 b - - 0 1
- Kxh3 Ra2 Kg3 Kb2 Kf2 Kc3+ Ke1 Kxd3 Kd1 Ra1#
pure model ideal mirror single-piece single-piece:black
Note: the side to move is in check in the diagram; the solution begins with a capture.
Deepest dual problems
Deepest dual with different first and last moves: h#4. The deepest dual overall is h#5, where the two solutions share a first or a last move.
Only one position exists at this depth.
h#4
8/8/8/b7/8/8/1K3R2/4R1k1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kxf2 Ra1 Ke2 Rxa5 Kd1 Kc3 Kc1 Ra1#
- Bxe1 Rc2 Bf2 Kc3 Kf1 Kd3 Ke1 Rc1#
pure model ideal mirror switchback self-block single-piece single-piece:black kniest nocheck umnov zilahi
Note: the side to move is in check in the diagram; the solution begins with a capture.