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KBPvkp
5 pieces.
- h#16
- longest mate
- h#10.5
- deepest unique
- 1
- positions at that depth
- h#11
- deepest dual
- h#9
- deepest strict dual
- 417,334,244
- positions with a helpmate
- 11,158,295
- with a unique solution
- 266,305,536
- cells in the plane
- 296,394,196 bytes
- on disk
Deepest unique problems
Only one position exists at this depth.
h#10.5
5B2/8/8/7p/7P/1k6/8/1K6 w - - 0 1
- Kc1 Kc4 Kd2 Kd5 Ke3 Ke6 Kf4 Kf7 Kg5 Kg8 Kxh5 Kh8 Kg6 Kg8 h5 Kh8 h6 Kg8 h7+ Kh8 Bg7#
pure model ideal switchback single-piece single-piece:black
Published as Szentai (1958)
- Szentai, Endre — Magyar Sakkelet, 1958; Suomen Tehtäväniekat, No. 320, 18/10/1999; Ideal-Mate Encyclopedia Vol.1, No. 1304, 1999
Deepest dual problems
Deepest dual with different first and last moves: h#9. The deepest dual overall is h#11, where the two solutions share a first or a last move.
Only one distinct idea exists at this depth: 2 positions share a solution.
h#9
2B5/8/8/p7/P4k2/8/K7/8 b - - 0 1
Two solutions, with different first and last moves (2 starts, 2 ends).
- Ke4 Kb3 Ke5 Kc4 Kd6 Kb5 Kc7 Kxa5 Kb8 Kb6 Ka8 a5 Kb8 a6 Ka8 Bb7+ Kb8 a7#
- Ke5 Kb3 Kd6 Kc4 Kc7 Kb5 Kb8 Kxa5 Ka8 Kb6 Kb8 a5 Ka8 a6 Kb8 a7+ Ka8 Bb7#
set-play pure model ideal switchback single-piece single-piece:black