Very good. He fixes Black's QRP as a weakness and "isolates" Black's QNP so that he can never capture White's QP.
Stifling Black's QB which can only be liberated by means of... P-K3, but then Black's centre pawns become weak.
17 PXP PXP
A purposeless retreat is often the first sign of defeat. Black should have maintained his B on its good diagonal and defended his QP with N-B2. In any case White obviously stands much better.
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