A question about a blunder. - Chess Forums

Hi everyone! I have a quick question about a specific move i made in a game, that the analysis tool diagnoses as a blunder. I really don't understand why it thinks so, and could use some human help! ^^ In this screenshot below, the tool says i should have played pawn to e5 to protect my undefended a1

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Millionaire_19's Blog • The Guide to Stop Making Blunders