Helpmate tablebases Every solution to every position, precomputed.

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KRvkqq

5 pieces.

h#8
longest mate
h#6.5
deepest unique
6
positions at that depth
h#6.5
deepest dual
h#5.5
deepest strict dual
61,527,184
positions with a helpmate
1,633,802
with a unique solution
121,110,528
cells in the plane
41,570,375 bytes
on disk

Deepest unique problems

h#6.5

8/8/5k2/8/8/6R1/2q3q1/1K6 w - - 0 1

  1. Ka1 Qb1+ Kxb1 Qe4+ Kc1 Qg6 Kd2 Kg7 Ke3 Kh6 Kf4 Kh5 Rh3#

pure model ideal switchback self-block umnov

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

h#6.5

5k2/6R1/8/8/8/8/2q1q3/1K6 w - - 0 1

  1. Ka1 Ke8 Rg1 Kd7 Rc1 Kc6 Rxc2+ Kb5 Kb2 Ka4 Kc3 Qb5 Ra2#

pure model ideal self-block

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

h#6.5

5k2/8/8/8/6R1/8/2q3q1/1K6 w - - 0 1

  1. Ka1 Qb1+ Kxb1 Qb7+ Kc2 Qg7 Kd3 Kg8 Ke4 Kh7 Kf5 Kh6 Rh4#

pure model ideal switchback self-block umnov

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

8/8/8/4q3/6k1/1q1R4/8/K7 w - - 0 1

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

  1. Rc3 Qe3 Rxb3 Kf3 Kb2 Ke2 Rxe3+ Kd1 Kc3 Kc1 Re1#
  2. Rd4+ Qe4 Rb4 Kf3 Rxb3+ Ke2 Kb2 Kd1 Kc3 Qe2 Rb1#

pure model ideal mirror self-block

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

h#5.5

7R/6k1/5q2/8/8/5q2/8/K7 w - - 0 1

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

  1. Kb1 Qh6 Kc2 Qd3+ Kxd3 Kg6 Ke4 Kh5 Kf5 Qh7+ Rxh7#
  2. Ka2 Qb3+ Kxb3 Qf8 Kc4 Kf7 Kd5 Ke8 Ke6 Qg8+ Rxg8#

pure model ideal mirror

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