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12
votes
2answers
260 views

Rotation-safe Latin squares

A Latin square is a square that has no repeated symbols in either the X or Y columns. For example: ABCD DABC CDAB BCDA is one such square. Notice how every ...
13
votes
5answers
406 views

Permutations of the Fifteen Puzzle

The Challenge Consider the following diagram of the Fifteen Puzzle in its solved state: ...
11
votes
1answer
668 views

Constructing an Orthogonal-Diagonal Greco-Latin Square

Consider a grid of NxN unique elements. Each element has a letter (from A to the Nth letter,...