8×8 Queens Puzzle #477

About 8×8 Queens puzzle #477

This is level 477 of 500 in the 8×8 Queens puzzles (intermediate size). Place 8 crowns so that every row, every column and every colored region holds exactly one, with no two crowns touching — not even diagonally. Our logic engine rates it medium: the solution takes 14 deductions, using these techniques:

• When a region claims a whole row
• Two regions, two rows
• When a row claims a region
• Last cell standing in a row
• The one-spot region

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