Queens answer. #923
Queen positions
Rows and columns below start at 1, from the top left.
- Row 1: column 4.
- Row 2: column 6.
- Row 3: column 3.
- Row 4: column 1.
- Row 5: column 7.
- Row 6: column 5.
- Row 7: column 2.
Why it works
The single-cell coloured region at row 2, column 6 forces a queen there. That excludes columns 5–7 in the neighbouring rows and column 6 throughout the board. The completed row-by-row column sequence is 4, 6, 3, 1, 7, 5 and 2. Each of the seven rows, columns and regions has exactly one queen, and no queens touch.
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