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

Quaternary Rotary

Full Symmetry

Tetrominoes

Quaternary Rotary

Unsolved

Impossible

Full Symmetry

Unsolved

Impossible

Hexominoes

Double Diagonal

Unsolved

Quaternary Rotary

Unsolved

Impossible

Full Symmetry

Unsolved

Impossible

Octominoes

Quaternary Rotary

Full Symmetry

Last revised 2016-06-30.


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Col. George Sicherman [ HOME | MAIL ]