Queen Simple Checkmates (Part 3/Queen & Rook v. King)

Checkmate Fundamental Patterns in Chess (Part I) - Remote Chess Academy

Is there an instance where a king is mated by another king in a chess game? - Quora

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Queen vs Rook Endgame - The Chess Website

Chess - Wikipedia

Queen Simple Checkmates (Part 3/Queen & Rook v. King)

Can a king and rook vs. king and queen endgame in a chess match ever end in a draw? - Quora

In this position, (black to move) Qe1 is apparently checkmate, but I am confused because the rook is pinned and therefore cannot defend the queen. Can someone explain this to me?