Pawn and Piece chains I

Hello! Today I will show you pawn and piece chains puzzles in the endgame.

1:

Black’s chain is in parts, while white has a full one. How to deliver or avoid checkmate?

White has to avoid checkmate, the bishop wins a queen. Black’s reply-?

Capturing the white bishop! Now solve the puzzle!

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BONUS PUZZLE! How do I start the Polish Opening?