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This position is from the opening stages of the game Alekhine-Weenink, Prague 1931. It is White to move. The textbooks gave .& c4 Alekhine's move takes into account the fact that Black is about to castle kingside and threatens e4 and e5 followed by .xh7 (whether Black castles or not). As a result, Black has no better move than h6, which means that a weakness in his castled position has already been brought about, and without any special expenditure in time by White, since & d3 is a...
