Helpmate tablebases Every solution to every position, precomputed.

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KRvkrr

5 pieces.

h#7.5
longest mate
h#6
deepest unique
100
positions at that depth
h#6
deepest dual
h#5.5
deepest strict dual
72,317,404
positions with a helpmate
2,231,929
with a unique solution
121,110,528
cells in the plane
33,197,630 bytes
on disk

Deepest unique problems

h#6

8/8/5kR1/8/8/7r/5r2/K7 b - - 0 1

  1. Ke5 Kb1 Kd4 Kc1 Kc3 Kd1 Kb2 Rb6+ Ka1 Kc1 Ra2 Rb1#

switchback self-block nocapture

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, where the two solutions share a first or a last move.

h#5.5

8/8/4k3/2rR4/8/8/5r2/1K6 w - - 0 1

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

  1. Rd7 Rc1+ Kxc1 Kf5 Kd1 Kg4 Ke1 Kh3 Kxf2 Kh2 Rh7#
  2. Rd8 Rc1+ Kxc1 Kf5 Kd1 Kg4 Ke1 Kh3 Kxf2 Kh2 Rh8#

pure model ideal mirror

h#5.5

4k3/8/8/8/r4R2/8/3r4/1K6 w - - 0 1

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

  1. Rf1 Rf4 Kc1 Kf7 Kxd2 Kg6 Ke3 Kh5 Kxf4 Kh4 Rh1#
  2. Rf2 Rf4 Kc1 Kf7 Kxd2 Kg6 Ke3 Kh5 Kxf4 Kh4 Rh2#

pure model ideal mirror nocheck umnov

h#5.5

5kr1/8/8/7R/8/8/3r4/1K6 w - - 0 1

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

  1. Rg5 Rd6 Kc2 Rdg6 Kd3 Kg7 Ke4 Kh7 Kf5 R6g7 Rh5#
  2. Rh8 Rd7 Kc2 Rh7 Kd3 Kg7 Ke4 Kh6 Kf5 Kh5 Rxh7#

pure model ideal mirror switchback self-block nocheck