411 REFERENCE · Wikibooks
Chess Opening Theory/1. b4/1...e6/2. Bb2/2...Nf6/3. b5/3...a6/4. a4/4...axb5/5. axb5/5...Rxa1/6. Bxa1
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Polish Opening: Rook Swap Line
6. Bxa1
White recaptures on a1 with their bishop. This position is equal and drawish, and both sides have many plans.