Helpmate tablebases Every solution to every position, precomputed.

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KRvknn

5 pieces.

h#7
longest mate
h#6
deepest unique
38
positions at that depth
h#6
deepest dual
h#5
deepest strict dual
83,869,441
positions with a helpmate
3,880,219
with a unique solution
121,110,528
cells in the plane
36,812,795 bytes
on disk

Deepest unique problems

h#6

8/8/7k/6R1/8/8/1n5n/K7 b - - 0 1

  1. Nd3 Kb1 Nf4 Kc2 Nh5 Kd3 Ng4 Ke4 Ngf6+ Kf5 Nh7 Rg6#

self-block nocapture

h#6

7R/8/7k/8/8/3n4/3n4/K7 b - - 0 1

  1. Kg7 Ka2 Ne4 Kb3 Nf6 Kc4 Ng8 Kd5 Kf8 Ke6 Ke8 Rxg8#

pure model mirror 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. The deepest dual overall is h#6, where the two solutions share a first or a last move.

h#5

8/8/8/8/8/8/1n4R1/K1n4k b - - 0 1

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

  1. Na2 Rh2+ Kg1 Kxb2 Kf1 Kc2 Ke1 Kd3 Kd1 Rh1#
  2. Ncd3 Rxb2 Kg1 Kb1 Kf1 Kc2 Ke1 Kxd3 Kd1 Rb1#

pure model ideal mirror

h#5

8/8/8/8/4n2k/n1R5/8/K7 b - - 0 1

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

  1. Kg4 Rc4 Kf3 Kb2 Ke2 Rxe4+ Kd1 Kc3 Kc1 Re1#
  2. Ng3 Kb2 Kh3 Kc1 Kg2 Kd2 Kf1 Ke3 Ke1 Rc1#

pure model mirror single-piece single-piece:black

h#5

8/8/6k1/8/8/8/2n5/1Kn4R b - - 0 1

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

  1. Ne2 Kxc2 Ng1 Kd3 Nh3 Ke4 Kh6 Kf5 Kh5 Rxh3#
  2. Ne3 Kxc1 Ng4 Kd2 Nh2 Ke3 Kh5 Kf4 Kh4 Rxh2#

pure model ideal mirror nocheck