The standard Benko Gambit line. White has three common options available to him:

• 5. bxa6, accepting the gambit. Black then plays ...Bxa6, going into the classical Benko Gambit.
• 5. b6 allows black to regain the pawn immediately via ...Qxb6, but in turn gives black fewer open lines. This is a good line for players who don't wish to get involved in theoretical lines as white.
• 5. Nc3 is an interesting alternative where white prefers to just continue with development.

For explanation of theory tables, see theory table and for notation, see algebraic notation..

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6

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Wikipedia has related information at Benko Gambit

• Kasparov, Garry, & Keene, Raymond 1989 Batsford chess openings 2. ISBN 0-8050-3409-9.