Monthly Archives: September 2015

Superflip composed with fourspot

Somehow, it slipped past my radar that Tomas Rokicki and Morley Davidson have established the maximum number of quarter-turns necessary to solve a Rubik’s cube (the more widely-popularised figure of 20 was for the half-turn metric). That is to say, … Continue reading

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Coverings, convolutions and Corbynatorics

Amidst Saturday’s turmoil, the following problem came into consideration: There are plans to build a nuclear power station on an initially empty 12-by-12 chessboard. Doing so would require an empty 4-by-3 or 3-by-4 rectangular region of squares. To foil this … Continue reading

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