411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...Nc6/2. d5/2...Ne5/3. f4/3...Ng6/4. e4/4...e5/5. f5
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Mikenas Defence
5. f5??
This move is the most popular in the Lichess Database, but it is a blunder. After /5...Qh4/ Black has a winning position.