Helpmate tablebases Every solution to every position, precomputed.

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KRvkbb

5 pieces.

h#7
longest mate
h#6
deepest unique
3
positions at that depth
h#6
deepest dual
h#5.5
deepest strict dual
79,145,065
positions with a helpmate
2,875,440
with a unique solution
121,110,528
cells in the plane
46,040,490 bytes
on disk

Deepest unique problems

Only one distinct idea exists at this depth: 3 positions share a solution.

h#6

8/6R1/6k1/8/8/8/2b5/K1b5 b - - 0 1

  1. Kf6 Ka2 Bg6 Kb3 Bf7+ Kb4 Ke7 Kc5 Kd8 Kd6 Bg8 Rxg8#

pure model mirror

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.

Only one position exists at this depth.

h#5.5

8/8/2R5/7k/8/b7/2b5/K7 w - - 0 1

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

  1. Ka2 Bg6 Kb3 Kh6 Kc4 Kg7 Kd5 Kf8 Ke6 Ke8 Rc8#
  2. Rxc2 Kg4 Ra2 Kf3 Rxa3+ Ke2 Kb2 Kd1 Kc3 Kc1 Ra1#

pure model ideal mirror single-piece single-piece:black