Can someone explain this move?

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Avatar of LightclawHD

Why's the computer saying Bishop a1 is the best move for white?

Avatar of NickGambitFan

On my way to not spoil an assessment, I think one should ask those questions, 1) Do I need the pawn there? If yes , 2 ) which moves should be considered and its drawbacks? The less it has , the better it should be. 2) if not, what am I searching for ?