Queens answer. #922
Queen positions
Rows and columns below start at 1, from the top left.
- Row 1: column 5.
- Row 2: column 9.
- Row 3: column 4.
- Row 4: column 6.
- Row 5: column 2.
- Row 6: column 7.
- Row 7: column 1.
- Row 8: column 3.
- Row 9: column 8.
Why it works
The lower-left region occupies column 1 in rows 7–8 and columns 1–3 in row 9; its queen is at row 7, column 1. The small central-lower region is covered by the queen at row 6, column 7. The full row-by-row column sequence is 5, 9, 4, 6, 2, 7, 1, 3 and 8. It uses every column and coloured region once, with no touching queens.
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