1 Feb 2020

A04 Unusual lines after 1.Nf3 and King's Indian Attack (1.c4 c5 2.Nc3 g6 3.Nf3 Bg7 4.d4 cxd4 5.Nxd4 Nc6 6.Nxc6 bxc6 7.g3 Nf6 8.Bg2 O-O 9.O-O)

A04 Unusual lines after 1.Nf3 and King's Indian Attack (1.c4 c5 2.Nc3 g6 3.Nf3 Bg7 4.d4 cxd4 5.Nxd4 Nc6 6.Nxc6 bxc6 7.g3 Nf6 8.Bg2 O-O 9.O-O)
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1.c4 c5 2.Nc3 A34 English Opening: Symmetrical Variation, Normal Variation g6 3.Nf3 Bg7 4.d4 cxd4 5.Nxd4 Nc6 6.Nxc6 bxc6 7.g3 Nf6 8.Bg2 0-0 9.0-0 A04 Unusual lines after 1.Nf3 and King's Indian Attack 9.Qa4 9...d5N 9...Bb7 10.Bf4 10.Be3 d6 11.h3 Qc7 12.b4 a5 13.Rb1 axb4 14.Rxb4 Rfb8 15.Qb3 Bc8 16.Bb6 Qd7 17.Rd1 Ba6 18.a4 Qc8 19.a5 c5 20.Ra4 Bb7 21.Rb1 Bxg2 22.Kxg2 e6 23.Nb5 Nd7 24.Rd1 Bf8 Clemens,C-Parma, B Bamberg 1962 0-1 (53) 10...d6 11.Qd2 Qd7 12.Rad1 c5 13.e4 Ng4 14.b3 Rad8 15.h3 Ne5 16.Be3 Qe6 17.f4 Nc6 18.Nd5 Bd4 19.Kh2 Bxe3 20.Qxe3 f6 21.e5 Kh8 22.Nc7 Qd7 23.exd6 exd6 24.Nb5 Smyslov,V-Shamkovich,L Baku 1961 1-0 (41) 9...Qb6 10.Be3 Qxb2 11.Nb5 Qb4 12.Rb1 Qa5 13.Qe1 Qxe1 14.Rfxe1 Ne8 15.Nxa7 Nd6 16.Nxc8 Rfxc8 17.c5 Nf5 18.Rb7 Nxe3 19.fxe3 Bh6 20.Kf2 Ra3 21.Rb3 Rxa2 22.Rd1 Ra7 23.Rbd3 Rcc7 24.Rb1 Posa,N (2240)-Dvoirys,S (2560) Budapest 1991 0-1 (44) 9...Qa5 10.Bd2 10.Qc2 Qh5 11.Bf4 d6 12.Bxc6 Bf5 13.e4 Bh3 14.f3 Qc5+ 0-1 (14) Beni,A-Ree,H Beverwijk 1966 10...Qh5 11.b3 Bb7 12.e3 Rfd8 13.Qxh5 Nxh5 14.Rad1 d5 15.cxd5 cxd5 16.Na4 Rac8 17.Rc1 Bc6 18.Ba5 Re8 19.Nc3 e6 20.Ne2 Bb2 21.Rc2 Ba3 22.Nd4 Bd7 23.Bh3 Nf6 24.b4 Boecher,J-Linnenborn,G Bochum 1991 0-1 (55) 10.cxd5 cxd5 11.Nxd5 11.Be3 11...Rb8 11...Nxd5= remains equal. 12.Qxd5 12.Bxd5 Rb8= 12...Qxd5 13.Bxd5 Rb8 12.Nc3 12.Nxf6+± Bxf6 13.Bh6 12...Qb6? 12...Be6 13.b3? 13.Bf4+- 13...Ba6 13...Bb7 14.Bxb7 Qxb7 14.Be3 Qb4 14...Qe6 15.Rc1 Ng4
15...Rbc8± was called for. 16.Nd5 16.Bd2!+- has better winning chances. 16...Qa3? 16...Nxe3± is more resistant. 17.Nxb4 17.fxe3 Qa3 17...Nxd1 18.Nxa6 Nc3 17.Bc5+- Qxa2 18.Nxe7+ Kh8 19.Re1 Weaker is 19.Bxa7 Bxe2 20.Rc2 Bxd1 19.Rc2+- Qxb3 20.Nc6 20.Bxa7 Rbd8± 19...Rfd8± 20.Qc2 20.Bd5+- and White stays clearly on top. 20...Qxb3? 20...Qxc2± is a better chance. 21.Rxc2 Rxb3 21.Qxb3? 21.Nc6+- is the precise move to win. Qxc2 22.Rxc2 21...Rxb3 22.h3 22.Bxa7 Rb2 23.Nc6 22...Nf6 22...Ne5± 23.Be3 23.Bxa7+- h5 24.e4 23...Rb2 24.Nc6 24.Bxa7 Rxe2 25.Bb6 Re8= 24.Rc7± 24...Rd7 Black should try 24...Re8 25.Ne5+- Don't take 25.Bxa7?! Rxe2 26.Be3 h5± 25...Re7 26.Nc4 26.Nd3+- Bxd3 27.exd3 26...Rb4? 26...Ra2= 27.Nd6? 27.Bc5+- and the rest is easy. Rxc4 28.Bxe7 27...Rb2 27...Kg8± 28.Nc8? White should play 28.Rc6+- Ra2 29.Rec1 28...Rd7 28...Re6 29.Red1 Rxd1+ Reject 29...Bxe2 30.Rxd7 Nxd7 31.Nd6± 29...Rc2 is superior. 30.Rxd1± Hoping for Rd8+. h5 30...h6± 31.Bf3? 31.Rd8++- Kh7 32.Nd6 31...Bxe2= 32.Bxe2 Rxe2 33.Bxa7 Ne4 34.Rd8+ Kh7 35.Ne7
35.Nd6= 35...Bf6 Better is 35...Nxf2! 36.Bxf2 Rxe7 36.Nd5? 36.Rd7= 36...Bxd8 Accuracy: White = 16%, Black = 19%.
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asilbar1458Vierjoki,T15560–1

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