Why is Bg5 a bad move?

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DelphiPax

blueemu

With his Pawns on e4, d3 and c4, White is already weak on the dark squares.

Trading off his dark-squared Bishop for a Knight (and leaving Black's Bishop now unopposed) is a serious strategic error.

DelphiPax
blueemu wrote:

With his Pawns on e4, d3 and c4, White is already weak on the dark squares.

Trading off his dark-squared Bishop for a Knight (and leaving Black's Bishop now unopposed) is a serious strategic error.

Thanks! I’ve never thought of moves in terms of square color.