Sudoku. Lesson 18 The amazing 3X3.

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As you start solving more difficult puzzles being able to spot a 3X3 is essential. if you spot a 3X3 in a row, block or column, you can safely eliminate other small similar numbers in that particular row, block or column which are part of the 3X3. . Watch for this in difficult puzzles.
Ooops Did you notice that I missed a ramification at 7.54 of a 6 which could go in Block #3

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