411 REFERENCE · Wikibooks
Chess Opening Theory/1. c4/1...a6
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English Opening rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pd pl pl pl pl pl pl pl pl rl nl bl ql kl bl nl rl 1. c4 a6 A10-A39 Starting position
English Opening
1...a6!?
A very interesting move by black. The idea is to play b5 and chip away White's strong c4 pawn. If white tries to stop it with 2. Nc3, black can play a gambit with 2...b5!?, pushing anyways, with the point of when white accepts it with 3. cxb5 axb5 4. Nxb5, white has 4...e5 or 4...d5, taking the entire center and preparing potential plans of a queenside attack.
1.c4 a6!?