11×11 Queens Puzzle #57

About 11×11 Queens puzzle #57

This is level 57 of 500 in the 11×11 Queens puzzles (master size). Place 11 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 16 deductions, using these techniques:

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

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