WCCT-12 theme

In a H#3.5-n, a pinned piece is unpinned, makes at least one move, and is then pinned again. The piece may be pinned in the diagram already or may become pinned during the solution before being unpinned and then pinned again. Twins, set play, multi-solution are allowed, but not zero positions. All phases must be thematic.

This is the theme of the 12th WCCT 2025-2027 (Section E). See WCCT-12 official page.

Fox, Charles Masson

Aftonbladet, 1927

Example: WCCT-12 theme
h#4  (3+6)

1.Rb4 Kd6 2.Rxd4+ Kc5 3.Rd6 Kb5+ 4.Rb6+ Bxb6#

WCCT-12 theme (interference unpin/direct self-pin, bR).

View in Helpmate Analyzer

FEN: qr6/kpK5/1r3n2/8/3P4/8/8/6B1

External links:

Kapros, Jorge Marcelo

Lois, Jorge Joaquín

idee & form, 1996

2nd Prize

Example: WCCT-12 theme
h#4 b) bKb3↔bPc5  (3+14)

a) 1.Sd5 Rxa2 2.Sc3+ Rg2 3.Scb1 Be2 4.Ka2 Bxc4#
b) 1.Sb1 Bxc4 2.Sc3+ Bf1 3.Scd5 Re2 4.Kc4 Rc2#

WCCT-12 theme (interference unpin/self-pin, wR)
WCCT-12 theme (interference unpin/direct self-pin, wB)

View in Helpmate Analyzer

FEN: q7/8/p1b5/2p5/1npp4/nk4pp/p5Rp/r4B1K

External links:

Sobrecases, Guy

idee & form, 2010

3rd Prize

Example: WCCT-12 theme
h#5  (3+14)

1.Bb5 d3 2.Kc3 Rd5 3.Rc8 Rxc5+ 4.Kb3+ Re5 5.Rc3 Rxb5#

WCCT-12 theme (interference unpin/direct self-pin by capture, wR).

View in Helpmate Analyzer

FEN: 4r1qb/8/8/2n1Rp1r/p3p3/pk1b4/2pPp3/K1n5

External links: