2500 chess kings!
2500 chess kings have to be placed on a 100 100 chessboard so that:
(i) no king can capture any other one (i.e. no two kings are placed in two squares sharing a common vertex
(ii) each row and each column contains exactly 25 kings.
Find the number of such arrangements. (Two arrangements differing by rotation or symmetry are supposed to be different.)
The answer is 2.
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1 solution
This is a 2010 IMO problem. The full solution is here .