Apart from the most popular systems: Open System (3… c5) covered in Lines 327-330, 3… Nf6 (Line 326) and Rubinstein Variation (3… dxe4 4. Nxe4, Lines 331-335) Black has at his disposal various alternatives.
Among the variations that are presented here, Morozevich Variation (3… Be7) apears to be the most promising. There are three major choices for White on the fourth move:
Move 4. Ngf3 leads to dynamic battles. After 4… Nf6 5. e5 Nfd7 6. Bd3 c5 7. c3 Nc6 occurs a critical position. White is later often obliged to sacrifice the d4-pawn, or to cede his strong pawn center with dxc5, but in return he gets half-opened e- and d-files for his rooks.
With 4. e5 c5 5. Qg4 White wants to make use of the fact that black Bishop isn’t defending the g7-pawn. Yet, Black is willing to defend the pawn with the King 5… Kf8, and after 6. dxc5 Nc6 he gets sufficient counterplay.
[Diagram: White to Move] Black is a pawn up and attacking on f2, but White has a path to longterm initiative with enterprising play!
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