Queens in exile
Non-attacking queens on infinite chess boards
F. Michel Dekking (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Jeffrey Shallit (University of Waterloo)
N.J.A. Sloane (The OEIS Foundation Inc.)
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Abstract
Number the cells of a (possibly infinite) chessboard in some way with the numbers 0, 1, 2, … . Consider the cells in order, placing a queen in a cell if and only if it would not attack any earlier queen. The problem is to determine the positions of the queens. We study the problem for a doubly-infinite chessboard of size ℤ × ℤ numbered along a square spiral, and an infinite single-quadrant chessboard (of size N × N) numbered along antidiagonals. We give a fairly complete solution in the first case, based on the Tribonacci word. There are connections with combinatorial games.
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