The Rubinstein Variation with 5. Nge2 is the logical response to the 4… c5 line: White wants to play a2-a3, without having to play with doubled pawns after Bxc3+. Moreover, since black pawn is on c5, he can no longer return his Bishop to e7.
The best reaction from Black is probably 5… cxd4 6. exd4 O-O 7. a3 Be7. White now has two main options of approximately the same strength: 8. Nf4 and 8. d5. Though Black needs to play precisely, he should be able to equalize.
[Diagram: White to Move] One of the critical positions of this opening line: White seizes the initiative with energetic play!
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