What is a double check in chess?

Since double check is an instant win, is this a loss for white

CHAPTER 6 DOUBLE CHECKS INTRODUCTION Diagram 156 - Name the white pieces that can both check the King at the same time on white's next turn.

Forcing the King to run with the Double Check, Chess Tactics

Checkmate After a Double-Check, White to Play

What is a Double Check in Chess?

DOUBLE CHECK, DISCOVERED CHECK, CHECKMATE, ALL AT ONCE

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