I won a game by making an illegal move.

I won a game by making an illegal move.

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Today, I played a game against 2nd North Zone Champion of Singapore, he is an Arena Candidate Master.  We played chess physically over the board in a restaurant, and here is the endgame position:

This is a draw. He plays Qb3+, and I played Qc4 to block the check. 
And here he finds an incredible move, Rd8+ !!
This is not the top engine move but this is also not a blunder. However, he suddenly shouted something and his facial expression changed. 
Kf7 is the move that makes the game a draw. I blundered and took the rook, and he took the queen.
And here my king is in check. Neither of us saw that and I played Rd1+ ???? 
And I won the game by resignation, he resigns and I won. 
Better than Stockfish hahaha

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