This is one of the reason IAm A bit dissAppointed with CHess.COM. It does not explain why the move shown here is an INACCURACY. As usual i think iam doing right as i opened to control the centre with knights and pawn. It would be more interesting if Chess.Com Gives Reason for every move even though it may be simple. Can someone explain why the move is INACCURATE.
Analysis without reason
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4...d5? 5 Bxe5 loses a pawn.