1.d4 Nf6 2.c4 e6 3. Nc3 Bb4 4.f3
f3 Variation (Kmoch Variation)
White tries to control e4 but delays development.
Usually Black answers 4…d5 5.a3 Bxc3+ 6.bxc3 c5 7.cxd5 Nxd5 putting
pressure to c3 and d4.

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