411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. d4/2...f5
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
not opening theory== 2...f5?? - Blunder ==
2...f5?? is a serious blunder because Black weakens the kingside and neglects the immediate tactical consequences in the center.