10×10 Queens Puzzle #31

About 10×10 Queens puzzle #31

This is level 31 of 500 in the 10×10 Queens puzzles (expert size). Place 10 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 17 deductions, using these techniques:

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

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