h#7
8/7k/8/8/1r6/K7/Pr6/8 b - - 0 1
- R4b3+ axb3 Kg6 b4 Kf5 b5 Ke4 b6 Kd3 b7 Kc2 b8=Q Kb1 Qxb2#
promotion excelsior excelsior:white single-piece single-piece:white
KPvkrr
5 pieces.
- h#8.5
- longest mate
- h#7
- deepest unique
- 5
- positions at that depth
- h#7.5
- deepest dual
- h#6.5
- deepest strict dual
- 243,671,766
- positions with a helpmate
- 3,725,415
- with a unique solution
- 355,074,048
- cells in the plane
- 135,575,742 bytes
- on disk
Deepest unique problems
Only one distinct idea exists at this depth: 5 positions share a solution.
Deepest dual problems
Deepest dual with different first and last moves: h#6.5. The deepest dual overall is h#7.5, where the two solutions share a first or a last move.
Only 2 distinct ideas exist at this depth.
h#6.5
8/8/8/1r6/2K1k3/8/1rP5/8 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc3 Ra5 Kxb2 Kd5 c4+ Kc6 c5 Kb7 c6+ Ka8 c7 Ra7 c8=Q#
- c3 R5b4+ cxb4 Ke5 b5 Kd6 b6 Kc6 b7 Kb6 b8=Q+ Ka5 Qa7#
pure model mirror promotion excelsior excelsior:white self-block single-piece single-piece:white umnov
h#6.5
3K4/8/3r4/8/8/8/2P1r3/5k2 w - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kc7 Re8 c4 Ke2 c5 Kd3 cxd6 Kc4 d7 Kb5 dxe8=Q+ Ka6 Qa4#
- Kc8 Kf2 c4 Ke3 c5 Kd4 cxd6 Kc5 d7 Kb6 d8=Q+ Ka7 Qa5#
pure model ideal mirror promotion excelsior excelsior:white single-piece single-piece:black umnov
Note: the side to move is in check in the diagram.