Why is 8.Be3 a blunder for White after Ruy Lopez Opening: Morphy

Exactly as the topic states. This Stockfish

Chess openings: Ruy Lopez (C60)

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From what I've seen, when the ruy Lopez exchange variation happens and the bishop eats the horse, the answer given by grand masters and the chess.com suggester, is to eat the horse

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Chess openings: Ruy Lopez, Closed (C84)

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1 Shortcut to Become Strong in Chess - Remote Chess Academy

Alburt, lev & dzindzichashvili & perelshteyn chess openings for black, explained (2005)