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Chess Opening Theory/1. a4/1...a5
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Ware Opening - Symmetric 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
Ware Opening - Symmetric Variation
1...a5
This move is an unusual response to 1. a4, but it is not without merit. If an informed player is playing White, he will not try to develop the rook from a1 to a3 (as ...e5 will prevent it), but will instead wait for a chance to play a5 followed by Ra4. An early 1...a5 by Black prevents this tactic and helps to negate any value of playing 1. a4.
All possible White's moves after 1. a4 a5
QuickNavigationRa3Na3Ra2b4b3c4c3Nc3d4d3e4e3f4f3Nf3g4g3h4h3Nh3
References
Ware Opening