Helpmate tablebases Every solution to every position, precomputed.

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KRvkn

4 pieces.

h#7
longest mate: h#5
deepest unique: 247
positions at that depth: h#5
deepest dual: h#5
deepest strict dual: 2,914,225
positions with a helpmate: 154,306
with a unique solution: 1,892,352
cells in the plane: 1,304,750 bytes
on disk

Deepest unique problems

h#5

8/8/8/8/8/n6k/6R1/K7 b - - 0 1

Nb5 Ra2 Kg3 Kb2 Kf2 Kc2 Ke1 Kd3 Kd1 Ra1#

pure model mirror nocapture nocheck

h#5

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

Ne2 Kc2 Ng1 Kd3 Nh3 Ke4 Kh6 Kf5 Kh5 Rxh3#

pure model ideal mirror nocheck

h#5

8/8/6k1/8/8/8/2n5/1K5R b - - 0 1

Ne3 Kc1 Ng4 Kd2 Nh2 Ke3 Kh5 Kf4 Kh4 Rxh2#

pure model ideal mirror nocheck

Deepest dual problems

Only 2 distinct ideas exist at this depth.

h#5

5n2/8/5k2/6R1/8/8/8/2K5 b - - 0 1

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

Ne6 Rg8 Ng7 Kd2 Kg5 Ke3 Kh4 Kf4 Ne8 Rh8#
Ng6 Kd2 Kg7 Ke3 Kh6 Rxg6+ Kh5 Kf4 Kh4 Rh6#

pure model ideal mirror

h#5

8/4nk2/8/8/6R1/8/8/2K5 b - - 0 1

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

Nf5 Rg2 Ng3 Kd2 Kg6 Ke3 Kh5 Kf4 Kh4 Rh2#
Ng6 Kd2 Kg7 Ke3 Kh6 Rxg6+ Kh5 Kf4 Kh4 Rh6#

pure model ideal mirror