Chess Avoidance by Erich Friedman



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## [chess-avoidance] puzzles 
### page.author

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

W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=5&P-ROOKS=0&P-BISHOPS=0&P-KNIGHTS=0&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=1&P-QUEENS=2&P-ROOKS=0&P-BISHOPS=2&P-KNIGHTS=1&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=1&P-QUEENS=3&P-ROOKS=0&P-BISHOPS=2&P-KNIGHTS=0&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=2&P-ROOKS=1&P-BISHOPS=1&P-KNIGHTS=2&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=2&P-QUEENS=1&P-ROOKS=1&P-BISHOPS=0&P-KNIGHTS=2&G=chess-avoidance

W=5x5&L=x0x4x16x4&P-KINGS=2&P-QUEENS=0&P-ROOKS=3&P-BISHOPS=0&P-KNIGHTS=1&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=0&P-ROOKS=3&P-BISHOPS=0&P-KNIGHTS=3&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=2&P-ROOKS=0&P-BISHOPS=5&P-KNIGHTS=0&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=2&P-QUEENS=1&P-ROOKS=0&P-BISHOPS=3&P-KNIGHTS=1&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=1&P-QUEENS=1&P-ROOKS=1&P-BISHOPS=3&P-KNIGHTS=1&G=chess-avoidance

W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=1&P-ROOKS=1&P-BISHOPS=2&P-KNIGHTS=3&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=0&P-ROOKS=3&P-BISHOPS=2&P-KNIGHTS=2&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=4&P-QUEENS=0&P-ROOKS=1&P-BISHOPS=1&P-KNIGHTS=1&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=0&P-ROOKS=1&P-BISHOPS=5&P-KNIGHTS=2&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=0&P-ROOKS=0&P-BISHOPS=4&P-KNIGHTS=4&G=chess-avoidance

W=5x5&L=x0x4x16x4&P-KINGS=0&P-QUEENS=0&P-ROOKS=2&P-BISHOPS=4&P-KNIGHTS=2&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=1&P-QUEENS=0&P-ROOKS=2&P-BISHOPS=1&P-KNIGHTS=4&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=2&P-QUEENS=0&P-ROOKS=2&P-BISHOPS=0&P-KNIGHTS=4&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=2&P-QUEENS=0&P-ROOKS=0&P-BISHOPS=5&P-KNIGHTS=2&G=chess-avoidance
W=5x5&L=x0x4x16x4&P-KINGS=4&P-QUEENS=0&P-ROOKS=0&P-BISHOPS=3&P-KNIGHTS=2&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=5x4&LF=n1b1b1r1k7b2n4k2&L=x12x4&P-KINGS=2&P-QUEENS=&P-ROOKS=1&P-BISHOPS=3&P-KNIGHTS=2&G=chess-avoidance
W=5x4&LF=k1n2b4q1b7k2b2&P-KINGS=2&P-QUEENS=1&P-ROOKS=0&P-BISHOPS=3&P-KNIGHTS=1&L=&G=chess-avoidance
W=5x4&LF=n0n1k2n1n7r3k2n3&L=x8x4&P-KINGS=2&P-QUEENS=&P-ROOKS=1&P-BISHOPS=0&P-KNIGHTS=5&G=chess-avoidance
W=5x4&LF=q1k6r1n7n3n1&L=x2x10&P-KINGS=1&P-QUEENS=1&P-ROOKS=1&P-BISHOPS=0&P-KNIGHTS=3&G=chess-avoidance
W=7x3&LF=b0k2b1n3b3b3k2q5&L=x11x7&P-KINGS=2&P-QUEENS=1&P-ROOKS=0&P-BISHOPS=4&P-KNIGHTS=1&G=chess-avoidance

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

##site.author
W=5x5&LF=q0q7q7q2q7&L=x2x1x1x4x7x5x4&P-QUEENS=5&T=Five_Queens&G=chess-avoidance
W=5x5&LF=r2b7r2b7b1r1&L=x0x3x1x10x8x1x1&P-ROOKS=3&P-BISHOPS=3&T=Tribisook&G=chess-avoidance

((A=Pedro))

## Acknowledgements and Changes

**2024-01-13** Fixed a regression found by @JustKirb