12×12 Queens Puzzle #196

About 12×12 Queens puzzle #196

This is level 196 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 18 deductions, using these techniques:

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

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