h#7
8/8/8/pK6/P7/8/6R1/7k b - - 0 1
- Kxg2 Kxa5 Kf3 Kb4 Ke4 a5 Kd5 a6 Kc6 a7 Kb7 Kc5 Ka6 a8=Q#
pure model ideal mirror promotion single-piece single-piece:black nocheck
Note: the solution begins with a capture.
KRPvkp
5 pieces.
- h#14
- longest mate
- h#7
- deepest unique
- 41
- positions at that depth
- h#8
- deepest dual
- h#6
- deepest strict dual
- 401,119,489
- positions with a helpmate
- 23,987,124
- with a unique solution
- 266,305,536
- cells in the plane
- 181,418,278 bytes
- on disk
Deepest unique problems
h#7
8/8/3p4/8/8/k1K5/R1P5/8 b - - 0 1
- Kxa2 Kb4 d5 c4 d4 c5 d3 c6 d2 c7 d1=R c8=Q Ra1 Qc2#
promotion underpromotion excelsior excelsior:white closed-walk self-block kniest nocheck
Note: the side to move is in check in the diagram; the solution begins with a capture.
h#7
8/8/8/R2p4/k7/2K5/2P5/8 b - - 0 1
- Kxa5 Kb3 d4 c4 d3 c5 d2 c6 d1=R c7 Rd6 c8=Q Ra6 Qc5#
promotion underpromotion excelsior excelsior:white closed-walk self-block kniest nocheck
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#6. The deepest dual overall is h#8, where the two solutions share a first or a last move.
Only 2 distinct ideas exist at this depth.
h#6
K7/8/8/5p2/8/6P1/5R2/7k b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kg1 g4 Kh1 g5 Kg1 g6 Kh1 g7 Kg1 g8=Q+ Kh1 Qg2#
- f4 Kb7 fxg3 Kc6 g2 Kd5 g1=R Ke4 Rg2 Kf3 Rh2 Rf1#
set-play pure model ideal promotion underpromotion switchback self-block single-piece single-piece:white single-piece:black pendulum
h#6
K7/8/8/8/7p/8/4P1k1/6R1 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Kf2 e4 h3 e5 h2 e6 h1=R e7 Rh3 e8=Q Rf3 Qe1#
- Kh2 Kb7 Kh3 Kc6 Kh2 Kd5 Kh3 Ke4 Kh2 Kf3 Kh3 Rh1#
promotion underpromotion excelsior excelsior:white switchback closed-walk self-block single-piece single-piece:white single-piece:black nocapture nocheck
Note: the side to move is in check in the diagram.