12×12 Queens Puzzle #191

About 12×12 Queens puzzle #191

This is level 191 of 500 in the 12×12 Queens puzzles (grandmaster size). Place 12 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 hard: the solution takes 16 deductions, using these techniques:

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

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