RU-ALLRUSSIAN 2009 Problem 97
- Grade 9
We call any eight squares in a diagonal of a chessboard as a fence. The rook is moved on the chessboard in such way that he stands neither on each square over one time nor on the squares of the fences (the squares which the rook passes is not considered ones it has stood on). Then what is the maximum number of times which the rook jumped over the fence?
Dataset text AI-MO AoPS. Quoted with source.
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