Helpmate tablebases Every solution to every position, precomputed.

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KQvkbn

5 pieces.

h#7
longest mate
h#6
deepest unique
1
positions at that depth
h#6
deepest dual
h#5
deepest strict dual
149,007,060
positions with a helpmate
7,084,347
with a unique solution
121,110,528
cells in the plane
76,827,322 bytes
on disk

Deepest unique problems

Only one position exists at this depth.

h#6

7k/8/8/8/8/b7/7Q/K1n5 b - - 0 1

  1. Kg7 Kb1 Ne2 Kc2 Ng1 Kd3 Nh3 Ke4 Kh6 Kf5 Kh5 Qxh3#

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

8/6k1/3Q4/1n6/8/8/8/1K3b2 b - - 0 1

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

  1. Nc3+ Kc2 Ne2 Kd3 Nf4+ Ke4 Ng6 Kf5 Kh6 Qxg6#
  2. Nc7 Kc2 Bd3+ Kxd3 Ne6 Ke4 Kh6 Kf5 Kh5 Qh2#

pure model mirror

h#5

8/7k/7n/8/8/8/8/1K1b3Q b - - 0 1

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

  1. Kg6 Kc1 Ng4 Kd2 Nh2 Ke3 Kh5 Kf4 Kh4 Qxh2#
  2. Bg4 Kc2 Bh3 Kd3 Ng4 Ke4 Kh6 Kf5 Kh5 Qxh3#

mirror nocheck