Benko against d4, Nf3, c4 and e3

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kafka23

Id love to throw a hammer at my opponent's head tomorrow. I know, he sometimes plays:

1. d4, Nf6 2. Nf3, g6 3. c4, c5 4. d5, b5 5. e3?! 

 

Any ideas? Maybe b4, cramping down his position?

 

GodsPawn2016

5...Qa5+, or 5...b4 is fine.