Helpmate tablebases Every solution to every position, precomputed.

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KBvkrb

5 pieces.

h#9.5
longest mate: h#6.5
deepest unique: 128
positions at that depth: h#6.5
deepest dual: h#6.5
deepest strict dual: 80,795,857
positions with a helpmate: 994,649
with a unique solution: 121,110,528
cells in the plane: 54,823,400 bytes
on disk

Deepest unique problems

h#6.5

8/8/b7/8/4k3/8/4rB2/K7 w - - 0 1

Bg1 Re1+ Kb2 Kf3 Kc3 Ke2 Kd4 Rd1+ Ke4 Ke1 Ke3 Bf1 Bf2#

pure model ideal switchback self-block nocapture

h#6.5

8/8/b7/8/3Bk3/8/2r5/K7 w - - 0 1

Kb1 Bc4 Kxc2 Ba2 Kb2 Kd3 Ka3 Kc2 Kb4 Kb1 Kc3 Ka1 Kc2#

closed-walk self-block single-piece single-piece:white nocheck

h#6.5

8/8/7B/8/7k/1b6/8/Kr6 w - - 0 1

Kxb1 Ba2+ Kc2 Kh5 Kd3 Kg6 Ke4 Kh7 Kf5 Kh8 Kg6 Bg8 Bg7#

pure model ideal self-block

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

Deepest dual problems

Only 2 distinct ideas exist at this depth.

h#6.5

8/6B1/8/8/7k/8/1rb5/K7 w - - 0 1

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

Bf8 Rb1+ Ka2 Rf1 Kb2 Kg3 Kc3 Kf2 Kd4 Ke1 Ke3 Bd1 Bb4#
Bh8 Rb1+ Ka2 Rf1 Kb2 Kg3 Kc3 Kf2 Kd4 Ke1 Ke3 Bd1 Bc3#

set-play self-block nocapture

h#6.5

8/8/5B1k/5b2/8/8/1r6/K7 w - - 0 1

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

Bc3 Rc2 Kb1 Rh2+ Kc1 Rh5 Kd2 Kg5 Ke3 Kh4 Kf4 Bh3 Be1#
Bd4 Rc2 Kb1 Rh2+ Kc1 Rh5 Kd2 Kg5 Ke3 Kh4 Kf4 Bh3 Bf2#

self-block nocapture