Can I checkmate if my king was already in check? - Quora

Those who dream by day are cognizant of many things which escape those who dream only by night - ART FLAIR

Lesson 3 – How to checkmate your opponent's king –

Unleashing the Fury: Chess Attack Techniques for Amateurs

Is there a legally reachable checkmate where the checking piece couldn't actually move to take the king because it would reveal a check on its own king? If so, has it ever

What happens if all kings are checkmated in a chess match, but no other piece is lost and both sides have one king left each? - Quora

Can I checkmate if my king was already in check? - Quora

In chess, can a pawn take a king? - Quora

Do You Have To Move Your King When In Check? - Chess Delta

The Queen's Gambit - The final Game: Harmon vs Borgov Analysis