411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...g6
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Fianchetto defence
Fianchetto Defence
Black allows their Bf8 to go to g7, which would place it on the long diagonal for activity. White can play a few moves, such as 4. Nc3 and 4. O-O as Black's quiet move doesn't interfere with White's development.
References