Chess Avoidance by Erich Friedman



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## [chess-avoidance] puzzles 
### @ErichFriedman

#### Mensa Bulletin (2022)
All solved boards are [unique up to symmetry|https://erich-friedman.github.io/published/avoid2/index.html] (mirror or rotation).


W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(5)1(0)1(0)1(0)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(1)35(2)1(0)1(2)1(1)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(1)35(3)1(0)1(2)1(0)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(2)1(1)1(1)1(2)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(1)1(1)1(0)1(2)1&G=chess-avoidance

W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(0)1(3)1(0)1(1)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(3)1(0)1(3)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(2)1(0)1(5)1(0)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(1)1(0)1(3)1(1)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(1)35(1)1(1)1(3)1(1)1&G=chess-avoidance

W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(1)1(1)1(2)1(3)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(3)1(2)1(2)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(4)35(0)1(1)1(1)1(1)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(1)1(5)1(2)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(0)1(4)1(4)1&G=chess-avoidance

W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(2)1(4)1(2)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(1)35(0)1(2)1(1)1(4)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(0)1(2)1(0)1(4)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(0)1(0)1(5)1(2)1&G=chess-avoidance
W=8x5&L=x0x4x16x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(4)35(0)1(0)1(3)1(2)1&G=chess-avoidance

((A=ErichFriedman))
((T=Mensa Bulletin&D=2022-09))


#### Games 2010 -- 2012
All but one of the [original boards|https://erich-friedman.github.io/published/avoid/index.html] were reduced to eliminate symmetries.

W=8x5&L=x0x5x5x5x1x4x1x4x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(0)1(1)1(3)1(2)1&G=chess-avoidance
W=8x5&L=x0x5x5x5x5x5x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(1)1(0)1(3)1(1)1&G=chess-avoidance
W=8x5&L=x0x5x5x1x4x1x4x5x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(2)35(0)1(1)1(0)1(5)1&G=chess-avoidance
W=8x5&L=x0x3x2x5x5x1x4x5x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(1)35(1)1(1)1(0)1(3)1&G=chess-avoidance
W=10x5&L=x0x1x4x1x4x1x4x1x3x1x1x4x1x4x1x1x3x1x1x1x1&L-CHESS=k40q1r1b1n1&L-FIELD=(2)45(1)1(0)1(4)1(1)1&G=chess-avoidance

((A=ErichFriedman))
((T=Games&D=2010))

##site.author
W=8x5&L=x2x1x1x4x7x5x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(5)1(0)1(0)1(0)1&T=Five_Queens&G=chess-avoidance
W=8x5&L=x2x1x1x4x7x5x4x1x1x1x1x1&L-CHESS=k30q1r1b1n1&L-FIELD=(0)35(0)1(3)1(3)1(0)1&T=Tribisook&G=chess-avoidance

((A=Pedro))

## Acknowledgements and Changes

**2024-01-13** Fixed a regression found by @JustKirb
**2025-01-03** :::Encoding [Chess Avoidance] was fully reencoded to use piece-counts instead of parameters.