Sudoku: stucked!

I've been doing puzzles on sudoku.org.uk for quite some time. I finally figured out that M stands for Moderate, G = Gentle, T= Tough and D= Diabolical.

As vindicated, the last two categories gave me the most grief. Despite the difficulty, I've always managed to complete them. It just took time.

Until recently.

Despite making a few guesses (note: making guesses is my last resort), I still couldn't complete this after more than 1.5 hours (numbers in black were given):
Unsolved sudoku 1

Unsolved sudoku 2

Can someone please help me to confirm at least 1 number?

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