CHESS
Difficulty level
Easy
Crossed Rooks
Clarifications
- A rook threatens another if they share a row or column with no pieces in between.
- Each rook must threaten exactly 2 rooks.
Place rooks on the 3 × 3 grid so that each one threatens exactly two others.
What is the maximum number of rooks you can place while meeting that condition?
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Solution and explanation
The four corners meet the condition: each rook attacks exactly two others, one in its row and one in its column.