Helpmate tablebases Every solution to every position, precomputed.

← all materials

KQBPvk

5 pieces.

h#8
longest mate: h#7
deepest unique: 73
positions at that depth: h#7
deepest dual: h#3
deepest strict dual: 476,910,673
positions with a helpmate: 76,876,200
with a unique solution: 355,074,048
cells in the plane: 328,604,518 bytes
on disk

Deepest unique problems

h#7

8/6Qk/8/8/8/B7/P7/2K5 b - - 0 1

Kxg7 Bb2+ Kf7 a4 Ke6 a5 Kd5 a6 Kc4 a7 Kb3 a8=B Ka2 Bd5#

pure model ideal promotion underpromotion excelsior excelsior:white single-piece single-piece:black

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

h#7

k7/Q7/8/8/6B1/8/6P1/3K4 b - - 0 1

Kxa7 Bf3 Kb6 g4 Kc5 g5 Kd4 g6 Ke3 g7 Kf2 g8=Q Kf1 Qg2#

promotion excelsior excelsior:white closed-walk single-piece single-piece:black phoenix nocheck

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

h#7

8/8/8/8/7B/8/K6P/6Qk b - - 0 1

Kxg1 Be1 Kf1 h4 Ke2 h5 Kd3 h6 Kc4 h7 Kb5 h8=Q Ka4 Qe8#

pure model ideal mirror promotion excelsior excelsior:white single-piece single-piece:black phoenix nocheck

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

Deepest dual problems

Deepest dual with different first and last moves: h#3. The deepest dual overall is h#7, where the two solutions share a first or a last move.

h#3

8/8/5P2/8/8/8/2Q5/K2kB3 b - - 0 1

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

Kxe1 f7 Kf1 f8=Q+ Ke1 Qff2#
Kxc2 f7 Kb3 f8=Q Ka4 Qb4#

pure model promotion switchback single-piece single-piece:white single-piece:black kniest phoenix

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

h#3

8/7B/8/1Q3P2/8/8/8/K5k1 b - - 0 1

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

Kf2 Kb2 Ke1 Kc3 Kd1 Qf1#
Kg2 Bg6 Kf2 Bh5 Ke1 Qe2#

set-play pure model mirror single-piece single-piece:black nocapture nocheck

h#3

8/8/1P6/8/8/5Q2/6k1/K5B1 b - - 0 1

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

Kxg1 b7 Kh2 b8=Q+ Kg1 Qbg3#
Kxf3 b7 Kg2 b8=Q Kh1 Qh2#

pure model mirror promotion switchback single-piece single-piece:white single-piece:black kniest phoenix

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