Helpmate tablebases Every solution to every position, precomputed.

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KBvkqb

5 pieces.

h#9.5
longest mate
h#6.5
deepest unique
256
positions at that depth
h#7.5
deepest dual
h#6
deepest strict dual
74,459,727
positions with a helpmate
876,332
with a unique solution
121,110,528
cells in the plane
59,451,970 bytes
on disk

Deepest unique problems

h#6.5

8/B7/1q6/8/2b5/8/8/K6k w - - 0 1

  1. Bb8 Qg1+ Kb2 Kg2 Kc3 Kf2 Kd4 Qd1+ Ke4 Ke1 Ke3 Bf1 Bg3#

set-play self-block nocapture

Published as Sheglow (1998)

  • Sheglow, Wiktor S. — Suomen Tehtäväniekat, No. (304), 05-06/1998

h#6.5

8/8/7B/8/7k/1b6/8/Kq6 w - - 0 1

  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.

h#6.5

8/8/8/4k3/8/2q5/8/KbB5 w - - 0 1

  1. Bb2 Qd4 Bxd4+ Kd5 Kb2 Kc4 Kc1 Kb3 Kd2 Ka2 Kc3 Ka1 Kb3#

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

Deepest dual problems

Deepest dual with different first and last moves: h#6. The deepest dual overall is h#7.5, where the two solutions share a first or a last move.

h#6

8/8/8/5B2/3k4/1q6/5b2/K7 b - - 0 1

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

  1. Qa3+ Kb1 Kc4 Kc2 Bb6 Kd2 Kb3 Kd3 Ka4+ Kc4 Ba5 Bd7#
  2. Qe3 Ka2 Kc3 Ka3 Kd2+ Kb4 Kd1 Kc4 Qc1+ Kd3 Be1 Bg4#

self-block nocapture

h#6

8/8/7k/8/2b5/4B3/5q2/K7 b - - 0 1

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

  1. Kh5 Kb1 Qf7 Kc2 Be6 Kd3 Kh4 Ke4 Qh5 Kf4 Bh3 Bf2#
  2. Qf4 Kb2 Kg7 Kc3 Qf7 Kd4 Kf8 Ke5 Qe8+ Kf6 Bg8 Bh6#

self-block nocapture

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

h#6

8/5b2/7k/8/8/4B3/7q/K7 b - - 0 1

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

  1. Kh5 Kb1 Qe5 Kc2 Kh4 Kd3 Qh5 Ke4 Be6 Kf4 Bh3 Bf2#
  2. Qf4 Kb2 Kg7 Kc3 Qb8 Kd4 Qg8 Ke5 Kf8 Kf6 Be8 Bc5#

self-block nocapture nocheck

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