411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...e5/2. Nf3/2...e4/3. Ng1
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3. Ng1
Reversed Brooklyn A40 Englund Gambit Declined: Reversed Krebs
Due to the lack of good options, White decides to retreat the knight, losing tempo. This shows that playing Nf3 earlier was a mistake. Black will play /4...d5/ to solidify their control of the center.