A typically creative Miles positional pawn sacrifice. The idea is to gain space and a pawn attack in return for White's extra pawn on h5, whose importance is yet to be decided. We have seen that the possession of two bishops is often worth a pawn, especially if they are supported by the initiative.
18 2xh5 2xh5 19 gxh5f5 20 g4!?
Returning the pawn for positive play based on the passed h-pawn. White can't wait around; e.g., 20 b4? g4 21 Ae2 Wh4; but a defensive move like 20 foc2 was possible.
22 Wh7 appears more effective. Perhaps White saw nothing promising after 22...2f6 or
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