the second most common, also making a grab for the centre and preserving the option to fianchetto the king's bishop to oppose the white one. White can play 2.Nf3 to transpose to the A06 line (see more below), or 2.Bb2 to proceed in the A01 line. 1...Nf6, the Indian Variation, developing a piece and not committing to a particular pawn formation just yet. 2.Bb2 and if 2...g6 then 3.e4, taking advantage of the pinned knight (e.g., not 3...Nxe4 4.Bxh8, winning a rook at the price of a pawn). 3.g4 is called the Spike Variation. 1...c5, the English Variation, retaining the options of ...d5, or ...d6 followed by ...e5. 2.c4 transposing to an English Opening or 2.e4 transposing to a Sicilian Defence. 1...f5, the Dutch Variation. Less common lines include: 1...e6, with Black setting up a variation on the French Defence. Here Keene recommends 2.e4 and if 2...d5 then 3.Bb2. 1...c6, a Caro–Kann variant preparing for ...d5. Again Keene recommends 2.e4 and if 2...d5, 3.Bb2. 1...b6, the Symmetrical Variation, is completely fine for Black. 1...b5, the Polish Variation. 1...Nc6, a variant of the Nimzowitsch Defence, with this move, Black aims to provide support for the advance of e-pawn. The most common sequence that Black applies is 2...e5 or less commonly 2...d5. 1.Nf3 Nf6 2.b3 1.Nf3 Nf6 2.b3 is a similar opening. Nimzowitsch preferred to make the knight move first. Black may play 2...d5 or 2...g6. After 2...d5, White usually plays 3.Bb2, then Black usually plays 3...e6. After 2...g6, White can play 3.g3, 3.Bb2, or 3.c4. The move 3.g3 is the same as 2.g3 g6 3.b3, which gives Reti Opening (ECO A05) or King's Indian, Fianchetto without c4 (ECO A49). With move 3.Bb2, Black usually plays 3...Bg7. White can continue 4.g3, 4.c4, or 4.e3. After 3.c4, play usually continues 3...Bg7 4.Bb2. Nimzowitsch–Larsen Attack The opening 1.Nf3 d5 2.b3 (ECO A06) is called the Nimzowitsch–Larsen Attack. It can be derived from 1.b3, but 1.Nf3 is more usual. Common replies for Black are 2...c5, 2...Nf6, and 2...Bg4. For each, White can play 3.Bb2 or 3.e3. 3.Bb2 can be followed by 4.e3. Example games Larsen vs. Eley, 1972 1.b3 e5 2.Bb2 Nc6 3.e3 Nf6 4.Bb5 d6 5.Ne2 Bd7 6.0-0 Be7 7.f4 e4 8.Ng3 0-0 9.Bxc6 bxc6 10.c4 d5 11.Nc3 Re8 12.Rc1 Bg4 13.Nce2 Nd7 14.h3 Bxe2 15.Qxe2 Nc5 16.Qg4 g6 17.f5 Nd3 18.fxg6 hxg6 19.Rf7 Kf7 20.Rf1 Bf6 21.Bxf6 Keene vs. Kovacevic, 1973 1.Nf3 d5