Sudoku Very Hard

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Sudoku XY-Wing Solves Difficult Sudoku Puzzles

A Sudoku XY-Wing pattern occurs in many of the more difficult Sudoku puzzles. Your ability to identify and solve this pattern will often break the logjam and lead you to the solution of a challenging Sudoku game.

Sudoku is a logic puzzle game. The objective is to fill the 9x9 Sudoku grid with digits 1 to 9 such that each of these 9 digits appears in each row, each column and each 3x3 sub-grid once any only once.

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