411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Bb5/2...c6/3. Ba4/3...b5
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Portuguese Opening
3...b5
With this move, black attacks the passive bishop again with tempo. The only move that saves the bishop is 4. Bb3.
1.e4 e5 2.Bb5 c6 3.Ba4 b5