CHESS
Difficulty level
Easy
The Rook Formation
Clarifications
- Rooks threaten only horizontally and vertically.
Place the maximum number of rooks on the 3 × 3 board without them threatening each other.
What is the maximum number of rooks that can be placed without them threatening each other?
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Solution and explanation
One valid placement is to put the rooks on squares 3, 5 and 7: there is one in each row and column. The maximum is 3 rooks.