Understanding Middlegame Strategies Vol.10

1.e4 c6 2.d4 d5 3.e5 Bf5 4.h4 & c4

Now we come to another popular line: 4.h4. An idea is to play an early c4 connected to 4.h4 h5 5.c4 which seems more dangerous than directly playing 4.c4.

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