The idea of the Van der Wiel Attack (4. Nc3) in the Caro-Kann Defense is to react to the most natural 4… e6 with an immediate pawn advance 5. g4 Bg6 6. Nge2, followed by going after the Black Bishop on g6 with h2-h4 and Nf4. In the occurring position, Black has a few ways to achieve decent counterplay, and the most direct reactions are 6… c5 and 6… f6, both leading to very sharp positions.
As an alternative to these demanding lines, Black can also choose a waiting move like 4… a6, in order to meet 5. g4 with 5… Bd7. White could carry on with 5. Be3 e6 6. g4 Bg6 7. Nge2 c5, where Black typically obtains satisfactory positons.
[Diagram: White to Move] In this double-edged position White has a way of launching a strong attack, though it demands major sacrifices!
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