Helpmate tablebases Every solution to every position, precomputed.

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KRBvkb

5 pieces.

h#10
longest mate: h#6
deepest unique: 28
positions at that depth: h#6
deepest dual: h#6
deepest strict dual: 160,087,984
positions with a helpmate: 12,845,767
with a unique solution: 121,110,528
cells in the plane: 109,968,017 bytes
on disk

Deepest unique problems

h#6

7b/7k/8/4R3/8/8/8/K1B5 b - - 0 1

Kg6 Bg5 Kh5 Kb1 Kg4 Re8 Kf3 Be7 Ke2 Bb4+ Kd1 Re1#

single-piece single-piece:black nocapture

h#6

8/8/8/8/2b5/8/8/1KBkR3 b - - 0 1

Kxe1 Kb2 Kd1 Ka3 Kc2 Kb4 Kb1 Kc3 Ka1 Kc2 Ba2 Bb2#

pure model ideal switchback self-block nocheck

Note: the side to move is in check in the diagram; the solution begins with a capture.

h#6

5B2/8/6bk/7R/8/8/8/2K5 b - - 0 1

Kxh5 Kd2 Bf7 Ke3 Kg6 Kf4 Kh7 Kg5 Kh8 Kh6 Bg8 Bg7#

pure model ideal self-block nocheck

Note: the diagram has no legal last move, so it cannot arise in a game.

Deepest dual problems

Only one distinct idea exists at this depth: 2 positions share a solution.

h#6

8/6b1/5k2/4R3/7B/8/8/K7 b - - 0 1

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

Kg6 Bg5 Kh5 Kb1 Kg4 Re8 Kf3 Be7 Ke2 Bb4+ Kd1 Re1#
Kf7 Be7 Ke8 Ka2 Kd7 Rh5 Kc6 Bg5 Kb5 Bd2+ Ka4 Ra5#

single-piece single-piece:black nocapture

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