Helpmate tablebases Every solution to every position, precomputed.

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KBvkbb

5 pieces.

h#10
longest mate
h#8
deepest unique
8
positions at that depth
h#8.5
deepest dual
h#6
deepest strict dual
62,659,013
positions with a helpmate
459,602
with a unique solution
121,110,528
cells in the plane
36,839,965 bytes
on disk

Deepest unique problems

h#8

5b2/8/8/8/7B/7b/7k/K7 b - - 0 1

  1. Bf5 Kb2 Kh3 Kc3 Kg4 Kd4 Kh5 Ke5 Kh6 Kf6 Kh7 Kf7 Kh8 Kxf8 Bh7 Bf6#

self-block nocheck

h#8

b7/8/8/8/8/8/2B2b2/k2K4 b - - 0 1

  1. Kb2 Be4 Kc3 Bxa8 Kd3 Kc1 Ke2 Kc2 Kf1 Kd3 Kg1 Ke4 Kh1 Kf3 Bg1 Kg3#

self-block nocheck

h#8

8/4B3/7b/8/6b1/8/7k/K7 b - - 0 1

  1. Kg3 Kb2 Kf4 Kc3 Kf5 Kd4 Kg6 Ke5 Kh7 Kf6 Kh8 Kg6 Be6 Kxh6 Bg8 Bf6#

self-block nocheck

Deepest dual problems

Deepest dual with different first and last moves: h#6. The deepest dual overall is h#8.5, where the two solutions share a first or a last move.

h#6

7b/8/6b1/8/3B1k2/8/8/2K5 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Ke4 Kb2 Kd3 Ka3 Kc2 Kb4 Kb1 Kc3 Ka1 Bxh8 Bb1 Kb3#
  2. Kg5 Kd2 Kh6 Ke3 Kh7 Kf4 Be5+ Kxe5 Kh8 Kf6 Bh7 Kf7#

self-block single-piece single-piece:white

h#6

b7/8/1b6/8/2k5/8/2K5/5B2 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Kd4 Bg2 Ke3 Bxa8 Kf2 Kd3 Kg1 Ke4 Kh1 Kf3 Bg1 Kg3#
  2. Kc5 Kd3 Be4+ Kxe4 Kc6 Bg2 Kb7 Kd5 Ka8 Kc6 Ba7 Kc7#

self-block

Note: the side to move is in check in the diagram.

h#6

8/8/8/4k1bb/8/8/2K5/B7 b - - 0 1

Two solutions, with different first and last moves (2 starts, 2 ends).

  1. Kf5 Kd3 Kg6 Ke4 Kh7 Kf5 Bf7 Kxg5 Bg8 Kf6 Kh8 Kg6#
  2. Ke6 Kd3 Kf7 Ke4 Kg8 Kf5 Bg6+ Kxg5 Bh7 Kf6 Kh8 Kf7#

self-block single-piece single-piece:white

Note: the side to move is in check in the diagram.