Originally Posted by Glenn Gould Fan
I'm an early intermediate player, so forgive me if this is a simple question. This is also my first post on this site.
I sometimes see a4 played by white but I do not know what kind of plan this move suggests. What does a4 do? Is a4 an aggressive move, or a passive move?
If it helps, a4 is a viable option in the following early position:
What does an a4 move in this position do, as opposed to the more standard-looking moves of d3, or O-O?
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a4 also prepares for (threatens)Ra3 aka a rook lift