Helpmate tablebases Every solution to every position, precomputed.

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KBvkn

4 pieces.

h#12
longest mate: h#8
deepest unique: 19
positions at that depth: h#8
deepest dual: —
deepest strict dual: 3,046,415
positions with a helpmate: 4,470
with a unique solution: 1,892,352
cells in the plane: 916,230 bytes
on disk

Deepest unique problems

h#8

8/8/8/8/8/1k6/5n2/1K5B b - - 0 1

Kc3 Bg2 Kd2 Bf1 Ke1 Kc2 Nh3 Kd3 Kf2 Ke4 Kg1 Kf3 Kh1 Kg3 Ng1 Bg2#

pure model ideal switchback self-block nocapture nocheck

h#8

8/8/8/8/8/1k6/4Bn2/2K5 b - - 0 1

Kc3 Kb1 Kd2 Bf1 Ke1 Kc2 Nh3 Kd3 Kf2 Ke4 Kg1 Kf3 Kh1 Kg3 Ng1 Bg2#

pure model ideal self-block nocapture nocheck

h#8

8/8/8/8/8/1k6/5n2/1K1B4 b - - 0 1

Kc3 Be2 Kd2 Bf1 Ke1 Kc2 Nh3 Kd3 Kf2 Ke4 Kg1 Kf3 Kh1 Kg3 Ng1 Bg2#

pure model ideal self-block nocapture nocheck

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

Deepest dual problems

No position at this depth satisfies the filter.

No position in this material has exactly two solutions differing in both their first and last move.