Putnam 1981 A2
Source: Putnam 1981
March 31, 2022
Putnamcombinatoricschess
Problem Statement
Two distinct squares of the chessboard are said to be adjacent if they have a vertex or side in common.
Also, is called a -gap if for every numbering of the squares of with all the integers there exist twoadjacent squares whose numbers differ by at least . Determine the largest -gap .