What is a Double Check in Chess?

Double check - Wikipedia

Chess 101: What Is Double Check? Learn How to Perform and Respond

Double check Fork, I think this is my best combo yet. : r/chess

John with a Double Check Checkmate!

My first ever double check checkmate : r/chessbeginners

Double Check in Chess by Edward Winter

THE DEADLY DOUBLE CHECK ! #chess #chesstok

Double Check achievement in Fritz - Don't call me a chess bot

The Double Check

Master Chess Strategy: Avoid Mistakes and Win with Double Check Threats (Part 2) — Eightify