Helpmate tablebases Every solution to every position, precomputed.

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KPvkbp

5 pieces.

h#14.5
longest mate
h#9.5
deepest unique
9
positions at that depth
h#11.5
deepest dual
h#8.5
deepest strict dual
417,327,693
positions with a helpmate
5,224,770
with a unique solution
266,305,536
cells in the plane
233,887,785 bytes
on disk

Deepest unique problems

Only 2 distinct ideas exist at this depth.

h#9.5

8/8/6p1/8/6P1/k7/8/Kb6 w - - 0 1

  1. g5 Kb4 Kb2 Kc5 Kc3 Kd6 Kd4 Ke7 Ke5 Kf8 Kf6 Ba2 Kxg6 Kg8 Kh6 Kh8 g6 Bg8 g7#

pure model ideal self-block nocheck

Published as Locker (1966)

  • Locker, Miklos S. — Magyar Sakkelet, 02/1966

h#9.5

2K5/8/8/8/6p1/6P1/2b5/k7 w - - 0 1

  1. Kd7 Kb2 Ke6 Bb3+ Kf5 Kc3 Kxg4 Kd4 Kh5 Ke5 g4 Kf6 g5+ Kg7 g6 Kh8 Kh6 Bg8 g7#

pure model ideal self-block

Deepest dual problems

Deepest dual with different first and last moves: h#8.5. The deepest dual overall is h#11.5, where the two solutions share a first or a last move.

Only one position exists at this depth.