Never copy your opponent
The Petrov punishment — why you never mirror moves · Petrov Defense (C42)
Black
White
Copying your opponent's moves feels safe — whatever works for them works for you, right? Wrong. This is the trap that punishes every copycat in the Petrov, and it wins the queen by move six. One discovered check does all the work.
The board stops before the key move — you'll have to find it yourself.
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