The most common move. 5... g6 is more flexible. Here in case white continues b3 to oppose the black bishop on g7, black can't capture with the knight on a6 to pressurise d5.

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 5. bxa6 Bxa6

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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.