411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Bc5/4. b4/4...Bxb4/5. c3/5...Ba5/6. d4/6...b5
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Evans Gambit Accepted: Leonhardt Countergambit
6...b5?!
An interesting gambit, Black sacrifices their b7 pawn to White's bishop on c4. The idea is that after 7. Bxb5, Black can play 7...Nxd4 where White's c3 pawn is pinned to the king, and unlike 6...Nxd4?, Nxe5 wouldn't be possible as the bishop on b5 is also attacked.