The Grob is terrible. It is a dubious opening leading by force to a position that is -1 for White. Here I show you exactly what you need to refute it. Here’s how to refute the line without any necessary extra sidelines to know. 1. g4 neglects the center, forces White to fall behind in development. Please direct anyone to this video looking for the correct response to 1. g4.
Here’s the analysis from the video. I hope you can use it to refute 1. g4 in your own games:
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