Helpmate tablebases Every solution to every position, precomputed.

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KRvkqn

5 pieces.

h#7.5
longest mate
h#6
deepest unique
66
positions at that depth
h#6.5
deepest dual
h#5.5
deepest strict dual
144,078,167
positions with a helpmate
5,241,983
with a unique solution
121,110,528
cells in the plane
72,585,331 bytes
on disk

Deepest unique problems

h#6

3n3R/7k/8/1q6/8/8/8/K7 b - - 0 1

  1. Kg7 Ka2 Qe8 Kb3 Nf7 Kc4 Qg8 Kd5 Kf8 Ke6 Ke8 Rxg8#

nocheck

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

h#6

8/7k/7R/8/7n/8/4q3/1K6 b - - 0 1

  1. Kg7 Rh8 Qh5 Kc2 Ng6 Kd3 Qh7 Ke4 Kh6 Kf5 Kh5 Rxh7#

nocheck

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

Deepest dual problems

Deepest dual with different first and last moves: h#5.5. The deepest dual overall is h#6.5, where the two solutions share a first or a last move.

h#5.5

4k3/3R4/8/8/8/4n3/5q2/1K6 w - - 0 1

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

  1. Rd1 Kf7 Kc1 Qd2+ Kxd2 Kg6 Kxe3 Kh5 Kf4 Kh4 Rh1#
  2. Rd8+ Kf7 Kc1 Qd2+ Kxd2 Kg6 Kxe3 Kh5 Kf4 Kh4 Rh8#

pure model ideal mirror

h#5.5

5k2/8/8/7n/8/8/3q4/RK6 w - - 0 1

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

  1. Ra2 Qc2+ Kxc2 Kg7 Kd3 Kh6 Ke4 Nf6+ Kf5 Kh5 Rh2#
  2. Ra3 Qc2+ Kxc2 Kg7 Kd3 Kh6 Ke4 Nf6+ Kf5 Kh5 Rh3#

set-play pure model mirror

h#5.5

5k2/8/6R1/8/8/8/6q1/1K4n1 w - - 0 1

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

  1. Kc1 Qe4 Rxg1 Qg6 Kd2 Kg7 Ke3 Kh6 Kf4 Kh5 Rh1#
  2. Rg4 Qb7+ Kc2 Qg7 Kd3 Kg8 Ke4 Kh7 Kf5 Kh6 Rh4#

pure model ideal self-block umnov