Never resign! (because it's never late for the opponent to blunder mate)

Chess.com says this puzzle is rated 2500. 97% pass rate. I guess I'm a master?

Why is this the best move?

What about it?

Isn't taking the rook back better and wins a pawn?

My first mistakeless chess match!

Cool M2 i found in a Game today

White resigned. Moral victory, forfeit or 700 elo blunder?

Can you find the next best move for black?

Accused me of cheating because I played fast in a bullet game

HOW my move is mistake and how I move c6?

Why is it oversight?

What about it?

I ended up taking rook and Queen

How is Bb4 not a brilliant move but an inaccuracy?

What about it?

A great would also be fine but inaccurate really?