00321nam a2200121Ia 4500020001500000082001900015100002000034245006100054260004800115300002600163500000500189700000500194  a0691115036  a510.9bW335.AB  aWatkins, John J  aAcross the boardbthe mathematics of chessboard problems  aPrincetonbPrinceton University Pressc2004  ax, 257p. Bibl. Index.  a  a