ECO: A09

An opening move in chess begining with White moving his g1 Knight to f3. This is a powerful variant of the King's Indian Attack:

1.Nf3 d5
2.c4

This possition does not become distinct until White fianchettoes both Bishops before challenging the center.

Variations:

Reti Gambit Accepted

1.Nf3 d5
2.c4 dxc4

Abandoning the center in this fashion is not recommended. The game scores accumulated from this position give White a strong advantage (17 - 30 percent better for White). Popular lines for White are 3.Qa4+ Nd7 4.g3 transposing into an advantageous variation of the Catalan; 3.e3 Nf6 4.Bxc4 e6 5.d4 (Queen's Gambit Accepted).

Advance Variation

1.Nf3 d5
2.c4 d4

With 2...d4 Black commits to a four tempo investment in the center (...d5, ...d4, ...c5, and...e5). Once finished, it will be difficult for White to break through in the center - but countermeasures can be taken immediately. In spite of its overall statistical 'ho-hum,' 3.b4! should give White tactical chances to prevent the creation of Black's massive center.

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