Digit lockdown technique

How to play hard third level Sudoku, game play 9

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This is the 9th game play session at Sudoku third level of hardness. In this game every step in the beginning was hard-going and finding the breakthrough was not easy. We needed to use a new technique for the breakthrough. But when we now know and have used this pattern, we won't forget it in a hurry. In fact we are incorporating this new technique as a routine step in our overall strategy of Sudoku game solving...

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