1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5 Warmerdam goes for the reliable Rossolimo Variation, avoiding deep opening theory in the Sveshnikov, Rauzer, and other sharp Sicilians after 3.d4. 3... g7g6  4. e1g1  4... f8g7  5. c2c3  5... g8f6  6. d2d4 The Dutch grandmaster gambits a central pawn. This rare move took his opponent by surprise. These days, it is often more practical to play an offbeat opening line that takes your opponent out of the book than an objectively better continuation that everyone and their cat have already studied. However, one better be sure that the sideline they've chosen doesn't backfire $1 6... c5d4 Vakhidov declines the offer after some thought, possibly recollecting his home analysis. 7. e4e5  7... f6d5  8. c3d4  8... d5c7 This move was not mandatory.