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Why is Stockfish suggesting a4?



Stockfish says that for move 5 and 6, a4 would have been best. Why, what advantage does it give?
seems like quite a minimal thing regardless, but it probably has something to do with preventing black from harassing the LSB with the knight (bc of the a2 square that is freed)
Because stockfish assumes you're not playing against a total dolt
Normal and correct advice is to ignore engine suggestions this early on and look at an opening book instead.

But otherwise - the move is thematic in this sort of position, it simultaneously constrains Black from expanding with a6-b5 and also provides a retreat square for the c4 Bishop on a2, where it stays safely on the a2-f7 diagonal.
There are some position where there are lots of OK moves and the computer likes one of them

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