411 REFERENCE · Wikibooks
Chess Opening Theory/1. Nf3/1...d5/2. g3/2...c5/3. Bg2/3...Nc6/4. O-O
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White Castles early in the style of the traditional Kings Indian Attack, which gives the white King early safety but also allows Black to increase their Center control with e5 ,creating a space disadvantage for white . white has to prepare counterattacking the center with d3 and later c4/e4