a kingside attack beginning with the moves Ng3, f2-f4, and then either e4-e5 or f4-f5. A famous demonstration of White's kingside attack was the game Penrose–Tal, Leipzig ol 1960. However, the development of the knight to e2 rules out the Nf3-d2-c4 manoeuvre, so Black is able to get quick counterplay on the queenside with ideas like ...c5-c4 followed by ...Nd7-c5. 7.f3: Kapengut Variation In 1996 Albert Kapengut published a dense analysis of the move 7.f3, which now bears his name. Kapengut himself gave it the name "Half-Sämisch Variation", because the positions it leads to are often reached via transposition from the Sämisch Variation of the King's Indian Defence. The pawn on f3 overprotects e4 and prevents ...Ng4, so that White can continue 7...Bg7 8.Bg5 and retreat the bishop to e3 after ...h7-h6 without it being further harassed by Black's knight. Notable past practitioners of this line have included Viktor Korchnoi and Murray Chandler. 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 This position arises particularly frequently through the transposition 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6. At this point White can still transpose to the Classical or Modern Main Lines after 7.e4. Other common alternatives are: 7.g3, the Fianchetto Variation; 7.Nd2, the Knight's Tour Variation; 7.Bf4; 7.Bg5, the Uhlmann Variation; and 7.h3, which is yet another attempt for White to enter the Modern Main Line without allowing an early ...Bg4. But in this move order Black can also prevent the transposition with 7...a6 (the immediate 7...Qe7? 8.e4 Nxe4?? loses the knight to 9.Qa4+) 8.a4 Qe7, which stops White from playing e2-e4. 7.g3: Fianchetto Variation The Fianchetto Variation has never been considered particularly dangerous for Black to meet, since White's setup does not put Black's position under immediate pressure. However, it also offers Black no obvious target to attack—the fianchettoed bishop covers e4 and d5 and also protects White's king. Since the same bishop no longer covers the a6-f1 diagonal, White typically plays Nf3-d2-c4 to help defend against Black's queenside expansion. After further preparatory moves such as Bf4 and Re1, White may be able to push forward in the centre with e2-e4-e5. Noted proponents of the Fianchetto Variation have included strong positional players such as Viktor Korchnoi, Gennadi Sosonko and Predrag Nikolić, and after a recommendation by the influential theorist Boris Avrukh in 2010, the line has become more topical. Play typically proceeds 7.g3 Bg7 8.Bg2 0-0 9.0-0,