Polyomino Semi-Oddities

Introduction.

A polyomino semi-oddity is a figure with four-way symmetry or better formed by an even number of copies of a polyomino that is not a multiple of 4. Here are the minimal known semi-oddities for polyominoes of order up through 8.

Domino

Tetrominoes

Double Orthogonal

Holeless Variant

Double Diagonal

Holeless Variant

Quaternary Rotary

Unsolved

Impossible

Full Symmetry

Unsolved

Impossible

Holeless Variant

Hexominoes

Double Orthogonal

Holeless Variants

Double Diagonal

Unsolved

Holeless Variants

Quaternary Rotary

Unsolved

Impossible

Holeless Variants

Full Symmetry

Unsolved

Impossible

Holeless Variants

Octominoes

Quaternary Rotary

Full Symmetry

Last revised 2023-06-13.


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Col. George Sicherman [ HOME | MAIL ]