Democratic Underground - van den Doel -Nikolic, part 2 of 4

5.0-0

(Mackenzie Opening) If 5.d4 (The Grand Spanish-Scotch Nexus doesn't have the colorful variety of gambits and sharp openings that its Italian cousin has) 5...exd4 6.0-0 Be7 then:

If 7.e5 Ne4 8.Nxd4 then:

If 8...Nxd4 9.Qxd4 Nc5 10.Nc3 0-0 then:

If 11.Nd5 then:

If 11...d6 then:

if 12.Nxe7+ Qxe7 13.exd6 Qxd6 14.Qxd6 cxd6 15.Bb3 Nxb3 16.axb3 then:

if 16...Bf5 17.c3 Rfe8 18.Be3 then:

if 18...Re6 then:

19.b4 Be4 20.Bd4 Rae8 21.Rfe1 Bc6 22.Re3 Rxe3 23.Bxe3 Re6(Sefc-Kozma, Czechoslovakian Ch, Prague, 1953).
19.Ra5 Be4 20.Rg5 Rae8 21.b4 f6 22.Rg3 Bc6 23.Rd1 Kf7 gives Black the over all advantage with more freedom as White's Bishop is pinned to the mating square; White has stronger pawns and more space (V. Zaitsev-Notkin, Moscow Ch, 1999).

18...Bc2 19.b4 Rac8 20.Rfc1 Bb3 21.Ra3 Be6 22.Rd1 is equal (Ljubojevic-Nikolic, Amber Rapid, Monte Carlo, 1996).

16...Be6 17.b4 Rac8 draw (Stojanovic-Bartel, Ol, Khanty-Mansiysk, 2010).

12.Bb3 dxe5 13.Qxe5 Bd6 14.Qh5 Nxb3 15.axb3 c6 16.Ne3 f5 gives Black a slight initiative (Messemaker-Anderssen, Rotterdam, 1861).

If 11...Nxa4 12.Qxa4 then:

If 12...d6 13.Nxe7+ Qxe7 14.exd6 Qxd6 then:

If 15.Bf4 Qb6 16.Qb3 Qxb3 17.axb3 Bf5 then:

18.c3 c6 19.Rfe1 Rfe8 20.b4 f6 21.f3 Kf7 22.Kf2 Rxe1 23.Rxe1 Re8 24.Rxe8 Kxe8 draw (Maric-Tringov, Op, Bordeaux, 1964).
If 18.Bxc7 Rac8 19.Be5 Rxc2 20.Rac1 Rxc1 21.Rxc1 Rc8 22.Rxc8+ Bxc8 23.b4 draw (Akopian-Matsuura, World Youth, Rio Gallegos, 1986).

If 15.Qf4 Qxf4 16.Bxf4 Bf5 17.Bxc7 Bxc2 18.Rac1 Bf5 is equal (Hort-Tringov, ZT, Keckemet, 1964).

If 12...c6 13.Nxe7+ Qxe7 14.Qd4 f6 15.Re1 Re8 16.Bf4 gives White the advantage in space (Black-Richmond, TM, via Cable, 1911).

If 11.Be3 Nxa4 12.Qxa4 d5 then:

If 13.exd6 Bxd6 14.Bf4 then:

If 14...Bxf4 15.Qxf4 Be6 16.Rfe1 Qd7 then:

17.Rad1 Qc6 18.Rd3 Rae8 is equal (Bujakovic-Karpov, TT Jr, Sochi, 19t68).
17.Qf3 Qd6 draw (Robatsch-Matanovic, IT, Palma de Mallorca, 1966).

If 14...Bd7 15.Qd4 Qh4 16.g3 Qh3 then:

17.Bxd6 cxd6 18.Nd5 Kh8 19.Rfe1 is equal (Adamski-Nezhmetdinov, IT, Baku, 1964).

17.Nd5 c5 18.Qd2 Bxf4 19.Qxf4 Rae8 20.Rfe1 Bc6 21.c4 gives Black more freedom; White's Knight is pinned to the mating square g2 (Simagin-Vatnikov, Soviet Ch ½-final, Vilnius, 1949).

13.Rad1 c6 14.Qb3 Qc7 15.f4 b5 16.Ne2 Rd8 gives Black a slight advantage with the Bishop and the best Bishop (Barden-Rivera, Ol, Amsterdam, 1954).

If 8...0-0 then:

If 9.Nf5 then:

If 9...d5 then:

If 10.Bxc6 bxc6 11.Nxe7+ Qxe7 12.Re1 then:

If 12...Re8 13.f3 Nd6 then:

If 14.Bf4 Nf5 15.Qd2 then:

If 15...Rb8 16.b3 h6 17.Nc3 Be6 then:

18.Na4 c5 19.Qf2 d4 is equal (Milos-Smejkal, Ol, Dubai, 1986).
18.Qf2 Qb4 19.Bd2 Qd4 20.Na4 Qxf2+ 21.Kxf2 Nd4 is equal (Hjartarson-Spassky, Euro ChT, Bayern/Lyon, 1991).

15...h6 16.h3 Rb8 17.b3 Be6 18.Nc3 Rb4 19.Na4 is equal (S. Christiansen-K. Larsen, Politiken Cup, Copenhagen, 2001).

14.b3 Nf5 15.Qd2 Qe6 16.Qf2 Bb7 17.Nc3 d4 18.Na4 gives White a strong tactical initiative with the threat of 19.Nc5! (Marjanovic-Psakhis, IT, Dortmund, 1982).

If 12...f6 13.f3 Ng5 then:

If 14.exf6 Qxf6 15.Bxg5 Qxg5 16.Qd2 Qg6 17.Nc3 Bf5 then:

18.Rac1 Rae8 19.Ne2 Qd6 20.c3 c5 21.Rcd1 Rd8 is equal (Tal-Klovens, Latvian Ch, Riga, 1958).
18.Re2 Rae8 19.Rae1 Bxc2 20.Rxe8 Rxe8 21.Rxe8+ Qxe8 22.Kf2 Bg6 23.Qd4 draw (Kavalek-Spassky, IT, Beverwijk, 1967).

14.b3 Re8 15.Bxg5 fxg5 16.Qd4 Be6 17.Nc3 c5 18.Qa4 gives White a small advantage in space (Boel-Idler, Corres, 1990).

If 10.exd6 Bxf5 11.dxe7 Nxe7 12.Bb3 then:

If 12...Nc5 13.Nc3 Nxb3 14.cxb3 then:

14...Qxd1 15.Rxd1 Rad8 16.Bf4 draw (Kramnik-Adams, Rpd, Cap d'Agde, 2003).
If 14...c6 15.Qf3 Be6 16.Be3 Bd5 17.Qf4 Be6 draw (Bagirov-Keres, IT, Baku, 1961).
If 12...Qxd1 13.Rxd1 then:

If 13...Rad8 14.Re1 Nc5 then:

15.Nc3 Rd7 16.Be3 Nxb3 17.cxb3 Rfd8 18.Rad1 f6 gives Black a small advantage in space (Ljubojevic-Karpov, IT, Milan, 1973).
15.Bc4 Nc6 16.Bg5 Rd7 17.Na3 b5 18.Nxb5 axb5 19.Bxb5 Rd6 gives Black a material edge and the advantage in space(Akopian-Ivanchuk, World Youth, Adelaide, 1988).

13...Rfd8 14.Re1 Nc5 15.Nc3 Nxb3 16.cxb3 Nd5 is equal (Mastrovasilis-Tkachiev, Ol, Dresden, 2008).

If 9...Nc5 10.Qg4 g6 then:

If 11.Bxc6 dxc6 12.Nxe7+ Qxe7 13.Qg3 Re8 then:

If 14.Re1 Bf5 then:

15.Nc3 f6 16.Re2 fxe5 is equal (Marjanovic-Ivkov, Yugoslav Ch, Vrbas, 1982).
15.Na3 f6 16.Bf4 b5 17.Qc3 Ne4 18.Qxc6 fxe5 is equal (Chigorin-Janowski, IT, Monte Carlo, 1902).

14.f4 Bf5 15.Na3 f6 16.Re1 Rad8 17.Qc3 Rd5 is equal (Jiménez Zerquera-Gligoric, IT, Palma de Mallorca, 1967).

11.Nxe7+ Qxe7 12.Bxc6 dxc6 13.Qg3 Re8 14.Re1 Bf5 15.Nc3 is equal (Medina García-Ivkov, IT, Palma de Mallorca, 1972).

If 9.c3 then:

If 9...Nxe5 10.Re1 d5 11.f3 c5 12.fxe4 cxd4 then:

If 13.exd5 then:

If 13...dxc3 14.Rxe5 then:

14...Qb6+ 15.Be3 Bc5 16.Nxc3 Bxe3+ 17.Kh1 Bf4 gives Black more activity and the initiative (Wolf-Leonhardt, Masters, Barmen, 1905).
14...cxb2?! 15.Bxb2! Bf6 16.Qd3 Bxe5 17.Bxe5 Qg5 18.Bc2 gives White a small material advantage and a threat of mate in one.

13...Qxd5 14.cxd4 Ng6 15.Nc3 Qa5 16.Bb3 Bf6 17.Be3 leaves White with an isolated passer; Black will need to keep it under lock and key (Prins-Wade, IT, Trencianske Teplice, 1949).
13.cxd4 Bg4 14.Qd2 Ng6 15.e5 f6 16.e6 Qd6 is equal (Sangueneti-Matanovic, ITZ, Portoroz, 1958).

If 9...Nc5 10.Bc2 Nxe5 then:

11.Qh5 Ng6 12.f4 Ne6 13.f5 Nxd4 14.cxd4 Bf6 15.fxg6 Bxd4+ 16.Kh1 gives White a powerful kingside attack (Dr. Tarrasch-Wolf, IT, Monte Carlo, 1902).
11.b4 Ne6 12.Bxh7+ Kxh7 13.Qh5+ Kg8 14.Qxe5 Bf6 15.Qe3 Nxd4 16.cxd4 Re8 gives Black a power initiative (Schiffers-Chigorin, Match, St. Petersburg, 1897).

If 7.Re1 then:

If 7...b5 then:

If 8.e5 Nxe5 9.Rxe5 d6 then:

If 10.Re1 bxa4 then:

If 11.Nxd4 Bd7 12.Qf3 0-0 13.Nc6 Bxc6 14.Qxc6 then:

If 14...Nd7 15.Nc3 Bf6 then:

16.Nd5 a3 17.Nxf6+ Qxf6 18.Qxd7 axb2 19.Bxb2 Qxb2 20.Qxc7 d5 21.Qa5 d4 is equal (Gaprindashvili-Smejkal, IT, Leipzig, 1977).
16.Bd2 a3 17.b3 Bd4 18.Rad1 Ne5 19.Qa4 Qf6 gives White stronger pawns and Black more space; Black's extra pawn is dead wood (Sax-Smejkal, IT, Amsterdam, 1979).

If 14...Re8 then:

If 15.Nc3 then:

15...a3 16.b3 d5 17.Bg5 h6 18.Bh4 d4 gives Black an extra pawn and the initiative; White has more space (Zdebskaja-Krivec, IT, Djakarta, 2007).
15...Qd7 16.Qxd7 Nxd7 17.Nxa4 Nf8 18.c4 Ne6 19.Be3 Bf6 leaves Black with a little more freedom (Ligterink-R. Byrne, IT, Amsterdam, 1979).

15.Qxa4 Bf8 16.Bd2 Rxe1+ 17.Bxe1 Qe8 draw (Kupreichik-Balashov, Soviet Ch ½-final, Minsk, 1985).

If 11.Bg5 0-0 12.Qe2 h6 13.Bh4 g5 14.Nxd4 then:

14...Bd7 15.Bxg5 hxg5 16.Qxe7 Qxe7 17.Rxe7 c5 18.Ne2 Rab8 gives Black more freedom; White's Rook on the seventh rank is ineffective (Sievers-Blatny, Bundesliga 9091, Germany, 1991).
14...Qd7 15.Bg3 Re8 16.Nc3 Bb7 17.Qd3 Bf8 gives Black a weak extra pawn (Rodríguez Vila-Sorin, Op, São Paulo, 1991).

If 10.Rg5!? bxa4 11.Rxg7 then:

If 11...Nh5 12.Rg5 Bxg5 13.Bxg5 f6 then:

14.Nxd4 0-0 15.Bh6 Ng7 16.Qf3 Bd7 17.Qg3 Rf7 gives Black the exchange and superior development; White has the outline of a kingside attack keeping him in the game, which ended in a draw (Dr. Euwe-Reshevsky, IT, Dubrovnik, 1950).
14.Qxd4 Kf7 15.Nbd2 Re8 16.Qh4 Ng7 17.Ne4 Rxe4 18.Qxe4 Bf5 gives Black a strong initiative (Rogers-Hebden,Op, London, 1988).

11...c5 12.Ng5 Bg4 13.Qe1 Bh5 14.Ne4 Kd7 15.Ng3 Bg6 leaves Black a pawn to the good and White struggles for equality (Kuzmin-Rogers, IT, Tallinn, 1985).

If 8.Bb3 d6 9.Bd5 then:

If 9...Nxd5 10.exd5 Ne5 11.Nxd4 0-0 12.a4 then:

If 12...Bg4 13.Qd2 Bd7 14.Nc3 then:

14...b4 15.Ne4 Qb8 16.f4 Ng4 is equal (Kiewra-Bojkov, IT, Berkeley, California, 2011).
14...bxa4 15.Nxa4 Bf6 16.b3 Ng6 17.Bb2 Be5 18.Nf3 is equal (Benhadi-E. Torre, IT, Dubai, 1986).

12...Bd7 13.Nc3 b4 14.Nce2 Re8 15.b3 Qc8 16.Ng3 Qb7 is equal (Pérez Pardo-Braga, Op Ponferrada, 1991).

9...Bb7 10.Nxd4 Nxd5 11.Nxc6 Bxc6 12.exd5 Bb7 13.a4 0-0 14.axb5 axb5 15.Rxa8 Bxa8 16.Qe2 Bf6 17.Qxb5 Qc8 18.Nd2 c6 19.dxc6 Bxc6 20.Qb3 Be5 is equal (Gonzalez-Valdes, Op, Isla Guitart, 1994).

If 7...0-0 8.e5 Ne8 then:

If 9.c3 then:

If 9...dxc3 10.Nxc3 d6 11.exd6 then:

If 11...Nxd6 12.Nd5 then:

If 12...Be6 13.Bxc6 bxc6 14.Nxe7+ Qxe7 15.Nd4 then:

15...Qf6 16.Nxe6 fxe6 17.Qe2 e5 18.Be3 is equal (Kochyev-Romanishin, IT, Lvov, 1978).
15...Qd7 16.Nxe6 fxe6 17.Be3 Rab8 18.Qe2 a5 19.Rac1 gives White stronger pawns in compenstion for his pawn minus (Kuijf-Panczyk, IT, Suedlohn, 1981).

12...Re8 13.Bxc6 bxc6 14.Nxe7+ Rxe7 15.Bg5 Rxe1+ 16.Qxe1 Qd7 is equal (A. Zaitsev-Smejkal, IT, Tallinn, 1971).

11...cxd6 12.Nd5 Be6 13.Bf4 Bxd5 14.Qxd5 Nc7 15.Qh5 Ne6 16.Rxe6 fxe6 17.Bc2 Rxf4 18.Qxh7+ Kf8 19.Qh8+ Kf7 20.Qh5+ Kf8 21.Qh8+ draw (Fatalibekova-Litinskiaya, Soviet ChW, Tbilisi, 1979).
If 9...b5 then:

If 10.Bb3 d5 11.cxd4 Be6 12.Nc3 then:

12...Rb8 13.Ne2 Bg4 14.Ng3 Qd7 15.Be3 is equal (Movsessian-Sigfusson, Euro Club Cup, Izmir, 2004).
12...Qd7?! 13.Bf4 Na5 14.Bc2 Nc4 15.b3 Nb6 16.a4 gives White a comfortable advantage in space (Antal-Erwich, Euro ChU16, Halkidiki, 2001).

10.Bc2 d5 11.cxd4 Nb4 12.Bb3 Bf5 13.Nc3 c6 14.Be3 gives White a slight advantage in space (Movsesian-Karhanek, Op, Olomouc. 1995).

If 9.Bf4 then:

If 9...b5 10.Bb3 d5 11.c3 then:

If 11...Bg4 12.h3 Bh5 13.g4 Bg6 then:

If 14.cxd4 Nb4 15.Bg3 then:

15...c5 16.dxc5 Nc7 17.Nc3 Nd3 18.Re2 d4 gives Black a Knight anchored at d3 in compensation for the pawn minus (Ribli-Hennings, IT, Helsinki, 1972).
Two correspondece games, Timmerman-van Oosterom, 1980, and Raijmaekers-Timmerman, 1982, continued 15...a5 16.a3 Nd3 17.Re2 a4 18.Ba2 b4 19.axb4 Nxb4 20.Nc3 a3 with equality and did not branch apart until White's 25th move; the 1980 game ended in a draw 41 moves and the 1982 game was won by Black in 40 moves.

If 14.Nxd4 Nxd4 15.cxd4 c6 then:

16.Be3 Nc7 17.Nc3 f5 18.f4 Qd7 19.Qf3 Kh8 is equal (Avetisian-Vepkhvishvili, Tbilisi Ch, 1984).
If 16.Bg3 Bh4 17.Kh2 f5 18.f4 Nc7 19.Nc3 Ne6 gives Black more freedom (Pohla-Dydyshko, TM, Minsk/Tallinn, 1975).

11...Na5 12.cxd4 Nxb3 13.Qxb3 c6 14.Qe3 h6 is equal (Tarjan-Taylor, Op, Lone Pine, 1978).

If 9...f6 10.Bxc6 dxc6 11.Qxd4 Qxd4 12.Nxd4 then:

If 12...f5 then:

If 13.Nf3 h6 14.h4 Be6 15.Nc3 c5 then:

If 16.Rad1 c6 17.Na4 b5 18.Nb6 Rd8 then:

19.Rxd8 Bxd8 20.Nd7 Bxd7 21.e6 Bc8 22.e7 Bxe7 23.Rxe7 Nf6 is equal (Gaprindashvili-Tarjan, Op, Lone Pine, 1977).
19.c4 Rxd1 20.Rxd1 Nc7 gives Black the Bishop pair as opposed to White's bad Bishop; White's Knight appears strong, but it has nowhere to retreat (Vukcevich-Tarjan, IT 7677, Hastings, 1976).

16.Ne2 c6 17.Be3 Nc7 18.Nf4 Kf7 19.h5 gives White the advantage in space; Black is for the moment frustrated in his desire to occupy the outpost d5.

13.Nc3 g5 14.Bd2 Ng7 15.Rad1 Ne6 16.Nce2 c5 17.Nxe6 Bxe6 18.f4 is equal (Gipslis-Ivkov, IT, Amsterdam, 1976).

12...Bc5 13.c3 g5 14.Be3 Be7 15.exf6 Bxf6 16.Nd2 Nd6 17.N4b3 is equal (Gipslis-Romanishin, IT, Tallinn, 1977).

(Grand Spanish Royal Game: Four Knights' Opening) If 5.Nc3 (This, also called the Tarrasch Variation, was popular in the late nineteenth century but has been seldom seen since) then:

If 5...d6 6.Bxc6+ bxc6 7.d4 Nd7 then:

8.dxe5 dxe5 9.Be3 Bd6 10.0-0 0-0 11.Qd2 Qe7 12.Na4 Rb8 is equal (Dr. Tarrasch-Chigorin, Match, St. Petersburg, 1893).
If 8.0-0 Be7 then:

If 9.dxe5 dxe5 then:

If 10.Be3 0-0 then:

11.Qd2 f6 12.Rfd1 Nb6 13.Qxd8 Rxd8 14.Rxd8+ Bxd8 15.Bc5 gives White a fair advantage in space (Foltys-Hromadka, Duras Mem, Prague, 1942).
11.a3 a5 12.Qd2 Bd6 13.Rfe1 Qe7 14.Ne2 gives White the advantage in space (Penrose-Blau, IT 5353, Hastings, 1952).

10.Na4 0-0 11.Be3 Bd6 12.c4 Qe7 13.Qc2 Qe6 14.Rad1 gives White the advantage in space (Keres-Udovcic, TM, Leningrad, 1957).

9.Be3 0-0 10.Qd2 exd4 11.Nxd4 Ne5 12.f4 c5 13.fxe5 cxd4 14.Qxd4 dxe5 15.Qxe5 gives White an extra pawn (Marco-Chigorin, IT, Nuremberg, 1896).

If 5...Bb4 6.Nd5 then:

If 6...Ba5 7.0-0 then:

If 7...b5 8.Bb3 d6 9.d3 Bg4 10.c3 then:

10...Ne7? 11.Nxe5 dxe5 12.Nxf6+ gxf6 13.Qxg4 Ng6 14.Bd5 Rb8 15.f4 gives White and extra pawn, a better center, stronger pawns and a lot more space (Dr. Tarrasch-Chigorin, Match, St. Petersburg, 1893).
10...h6 11.Nxf6+ Qxf6 12.Bd5 Bd7 13.a4 0-0 14.Be3 gives White an impressive advantage in space.

7...d6 8.d3 Bg4 9.c3 Nd7 10.Ne3 Bh5 11.Bxc6 bxc6 12.Qa4 Bb6 13.Qxc6 0-0 14.Nf5 gives White an extra pawn and a considerable advantage in space; Black has the Bishop pair (Tarrasch-Chigorin, Match, St. Petersburg, 1893).

If a) 6...Be7 then:

If 7.d3 d6 then:

If 8.Nxe7 Qxe7 9.c3 then:

9...h6 10.h3 0-0 11.g4 Nh7 12.Rg1 Nd8 13.Be3 Ne6 14.h4 gives White the Bishop pair and the advantage in space (Weiss-Chigorin, IT, New York, 1889).
9...0-0 10.h3 b5 11.Bc2 d5 12.Bg5 Be6 13.Nh2 h6 is equal (Loewy-Moewig, Group A, Barmen, 1905).

8.Nb4 Bd7 9.Nxc6 Bxc6 10.Bxc6+ bxc6 11.0-0 0-0 12.Qe2 is equal (Dr. Tarrasch-Berger, DSB Kongress, Breslau, 1889).

7.d4 exd4 8.Nxe7 Qxe7 9.0-0 0-0 10.Re1 d6 11.Bxc6 bxc6 12.Nxd4 is equal (Krause-Yates, Ol, London, 1927).

If b) 6...Bc5 7.d3 h6 8.Be3 Bxe3 9.fxe3 then:

9...Nxd5 10.exd5 Ne7 11.e4 Ng6 12.d4 0-0 13.dxe5 Nxe5 14.0-0 is equal (L. Paulsen-Anderssen, DSB Kongress, Altona, 1869).
If 9...d6 10.0-0 Be6?! 11.Nxf6+! Qxf6 12.Nd4 Qg5 then:

If 13.Nxc6 Qxe3+ 14.Kh1 Bd7 then:

15.Nxe5?! Bxa4 16.Nxf7 is equal (Schlecter-Pollack, IT, Hastings, 1895).
15.Rxf7! Bxc6 16.Qh5 0-0-0 17.Bxc6 bxc6 18.Qg4+ gives White a strong attack.

13.Nxe6 fxe6 14.Rf3 Rf8 15.Bxc6+ bxc6 16.Qe2 gives White an overall advantage.

(Derl Opening or Delayed Exchange Ruy Lopez) If 5.Bxc6 dxc6 6.d3 then:

If 6...Nd7 7.Nbd2 then:

If 7...Bd6 8.Nc4 then:

If 8...c5 then:

If 9.a4 b6 then:

If 10.0-0 0-0 11.Bd2 then:

11...Bb7 12.Bc3 Qe7 13.b3 f5 14.exf5 Rxf5 is equal (Korchnoi-Suetin, Soviety Ch, Kiev, 1964).
11...Re8 12.Ne3 draw (Velimirovic-Petronic, Yugoslav Ch, Niksic, 1997).

10.Bd2 a5 11.Bc3 f6 12.h4 h5 13.Nfd2 Nf8 is equal (Meister-Inarkiev, Russian ChT, Sochi, 2004).

If 9.0-0 0-0 10.a4 then:

10...f6 11.h3 Nb8 12.Nh2 Nc6 is equal (Zupe-Sebag, IT, Graz, 2006).
If 10...Re8 then:

11.Bg5 f6 12.Be3 Nb8 13.Nh4 Nc6 14.Nf5 is equal (Velimirovic-Jeremic, Yugoslav ChT, Budva, 2003).
11.Be3 Nf8 12.Nfd2 Ng6 13.Nxd6 cxd6 14.Nc4 Be6 15.a5 Qc7 draw (Gipslis-Matanovic, IT, Lvov, 1962).

If 8...0-0 9.0-0 Re8 10.b3 then:

If 10...c5 11.Bb2 then:

11...b5 12.Ne3 Nf8 13.a4 Bd7 14.h3 Ng6 is equal (A. Muzychuk-Zawadzka, Euro Ch, Aix-les-Bains, 2011).
11...f6 12.Nh4 Nf8 13.Nf5 Be6 14.f4 exf4 15.Ncxd6 cxd6 is equal (Korbut-Zawadzka, World ChTW, Ekaterinburg, 2007).

10...Nf8 11.Bb2 Ng6 12.d4 exd4 13.Qxd4 Bf8 14.Qe3(Rossi-David).

If 7...Be7 8.0-0 0-0 9.Nc4 f6 10.Nh4 then:

If 10...Nc5 11.Nf5 Bxf5 12.exf5 then:

If 12...Qd5 13.Qg4 Rfe8 14.Re1 Rad8 15.Nd2 then:

If 15...Bf8 16.h3 Qf7 then:

17.b3 Rd4 18.Qe2 Red8 19.g3 g6 20.Bb2 gives White a slight initiative and Black more space (Kurajica-Gligoric, IT, Sarajevo, 1983).
17.Nf3 Qd5 18.Nd2 Qf7 19.b3 Rd4 20.Qe2 Red8 21.g3 is equal (Sax-Geller, IZT, Moscow, 1982).

15...Qf7 16.b3 a5 17.Bb2 a4 18.Nf3 Bd6 19.d4 is equal (Tal-Dorfman, IT, Lvov, 1984).

12...Qd7 13.Qg4 b5 14.Ne3!? Rfe8! 15.f3 Na4 draw (Scholl-Portisch, IT, Amsterdam, 1967).

If 10...g6 11.Bh6 Rf7 then:

If 12.f4 exf4 13.Rxf4 then:

13...Nc5 14.Rf1 f5 15.Nf3 fxe4 16.dxe4 Qxd1 17.Raxd1 Nxe4 is equal (Tseitlin-Azarov, Op, Capplle-la-Grande, 2006).
13...Bf8 14.Bxf8 Nxf8 15.Rf2 Be6 16.Nd2 c5 draw (Silva Sanchez-Trotzky Ypes, Pan-Am Ch, Havana, 1970).

If 12.d4 exd4 13.Qxd4 Bc5 14.Qd2 Qe7 15.Rfe1 b5 is equal (Bogveradze-Vepkhvishvili, IT, Tbilisi, 1970).

If 6...Bd6 7.Nbd2 Be6 then:

If 8.Qe2 Nd7 9.Nc4 f6 10.d4 Bg4 then:

11.dxe5 Nxe5 12.Ncxe5 Bxe5 13.h3 Bxf3 14.Qxf3 Qe7 15.c3 0-0 16.0-0 Rae8 is equal (Flohr-Keres, IT 3738, Hastings, 1938).
11.Be3 exd4 12.Bxd4 Qe7 13.Nxd6+ cxd6 is equal.

8.b3 c5 9.Nc4 Nd7 10.Ng5 Bxc4 11.bxc4 Nb8 12.Rb1 b6 13.0-0 0-0 14.f4 gives White the advantage in space (Korbut-Shen Yang, TM, Moscow, 2007).

(Clam Opening) If 5.d3 d6 then:

If 6.0-0 Be7 7.c3 0-0 8.Re1 then:

If 8...b5 then:

If 9.Bc2 d5 10.Nbd2 dxe4 11.dxe4 Be6 12.a4 b4 13.Qe2 Qc8 14.Nc4 Nd7 is equal (Kamsky-Ivanchuk, World ChT, Ningbo, 2011).
(Clam Opening/Pilnik Variation) If 9.Bb3 (this position may be reached by 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.d3) 9...Na5 10.Bc2 c5 11.Nbd2 Nc6 12.Nf1 Re8 13.h3 h6 then:

If 14.Ng3 Bf8 15.d4 then:

If 15...cxd4 16.cxd4 then:

If 16...exd4 17.Nxd4 Nxd4 18.Qxd4 then:

If 18...Be6 19.Bf4 Rc8 20.Bb3 then:

20...a5 21.Rad1 a4 22.Bxe6 Rxe6 23.Rc1 g6 24.Qd3 is equal (Akopian-Khalifman, FIDE Knock Out, Las Vegas, 1999).
20...d5 21.Rad1 Bc5 draw (Berndt-Svidler, Euro Club Cub, Panormo, 2001).

If 18...Bb7 19.Bf4 Rc8 20.Bb3 a5 21.a4 bxa4 22.Bxa4 gives White a better center, command of the open diagonal a4/e8, the initiative and more space; Black has command of the c-file and pressure on White's e-pawn (Sadvakasov-Svidler, IT, Poikovsky, 2005).

16...Bd7 17.Be3 exd4 18.Nxd4 d5 19.exd5 Nb4 20.Qf3 Nbxd5 21.Rad1 is equal (Emms-Balashov, Op, Cappelle-la-Grande, 1992).

If 15...Qc7 then:

If 16.Be3 g6 17.Rc1 Bd7 18.Qd2 Kh7 19.Bb1 gives White a better center; Black actually has a slight advantage in space (Ujtelky-Filip, Czechoslovakian Ch, Prague, 1953).
16.d5 Ne7 17.Nxe5 (well, at least it's flashy, but White doesn't gain or lose anything from it) 17...dxe5 18.d6 Qa7 19.dxe7 Qxe7 is equal (Teichmann-Dr. Tarrasch, IT, Ostend, 1905).

14.d4 Bf8 15.d5 15...Ne7 16.a4 Bd7 17.axb5 axb5 18.Be3 gives White a better center, but Black actually has a teensy bit more space (Ciocaltea-Pfleger, IT, Hastings, 1971). /end Pilnik Variation

(Clam Opening/Anderssen Variation) If 8...Bg4 9.Nbd2 Nd7 10.h3 Bh5 11.Nf1 Nc5 then:

If 12.Bc2 then:

If 12...Ne6 13.Ng3 Bxf3 14.Qxf3 Bg5 15.Be3 g6 then:

16.Bb3 Kg7 17.Ne2 Nc5 18.Bc2 f5 19.Bxc5 dxc5 20.exf5 Rxf5 21.Qg4 gives White a small advantage with superiority on the kingside and stronger pawns while Black has a bind on d4 (Nepomniachtchi-Mamedyarov, IT, Dortmund, 2008).
16.b4 Kh8 17.Bb3 Qf6 18.Qxf6+ Bxf6 19.Nf1 Bg5 gives White the Bishop pair and more space; Black's Bishop is bad and he will not easily approach White's pawn weaknesses (Shamkovich-Bobolovich, City Ch, Moscow, 1964).

If 12...d5 13.Qe2 d4 14.g4 Bg6 15.Ng3 then:

15...Re8 16.Nf5 Bf8 17.cxd4 exd4 18.N3h4 Qd7 19.Ng2 Rad8(Boleslavsky-Pytlakowski, IT, Warsaw, 1947).
15...Ne6 16.Nf5 Bc5 17.Bd2 f6 18.Bb3 Bf7 19.Kh1 Ne7 is equal (Tabenhaus-Janowski, IT, Ostend, 1907).

If 12.Bxc6 bxc6 13.Ng3 then:

If 13...Bg6 14.d4 exd4 15.Nxd4 Qd7 then:

16.b4 Ne6 17.Qa4 Nxd4 18.cxd4 Rfd8 19.Be3 is equal (Bartel-Maiorov, Euro Rpd Ch, Warsaw, 2010).
16.Ndf5 Rfe8 17.Qg4 Rad8 18.Bg5 Bxg5 19.Qxg5 f6 is equal (Livshin-Borisenko, Soviet Ch, Kiev, 1954).

If 13...Bxf3 14.Qxf3 Ne6 15.Be3 c5 then:

If 16.Rad1 Rb8 17.Re2 Bf6 18.Rc2 Re8 19.Nf5 gives White a slight edge with stronger pawns (Hort-Renet, TM, Uzes, 1990).
If 16.Ne2 Rb8 17.b3 then:

17...Bf6 18.Rad1 a5 19.d4 cxd4 20.cxd4 exd4 21.Bxd4 Nxd4 22.Nxd4 gives White better pawns as the endgame approaches (A. Hunt-Stocek, IT, Coventry, 2003).
If 17...Bg5 18.Ng3 c6 19.Nf5 Bxe3 20.fxe3 g6 21.Ng3 remains equal. /end Anderssen Variation

(Clam Opening/Duras Variation) If 6.c4 g6 7.d4 then:

If 7...exd4 8.Nxd4 Bd7 9.Nxc6 then:

If 9...Bxc6 then:

10.0-0 Bg7 11.Nc3 0-0 12.f3 Nd7 13.Be3 Ne5 14.Bb3 gives White the early advantage in space (Duras-Rubinstein, IT, St. Petersburg, 1909).
If 10.Bxc6+ bxc6 11.0-0 Bg7 then:

If 12.Nc3 0-0 13.Bg5 then:

13...h6 14.Bh4 Qb8 15.Qc2 Qb4 16.b3 Rfe8 is equal (Vydeslaver-Golod, Rpd, Beer Shiva, 2004).
13...Qe8 14.Re1 Nd7 15.Qd2 Qe6 16.b3 f5 17.Rac1 is equal (Voelker-S. Ernst, Bundesliga 0405, Germany, 2005).

12.Qa4 Qd7 13.c5 0-0 14.cxd6 cxd6 15.Nc3 Rfe8 16.Rd1 Qe6 17.Qxc6 draw (Cicak-T. Ernst, Swedish Ch, Goteborg, 2006).

If 9...bxc6 10.0-0 Bg7 11.c5 0-0 12.Nc3 then:

12...Qe7 13.cxd6 cxd6 14.f3 d5 15.Re1 d4 is equal (Duras-Cohn, IT, Karlsbad, 1911).
12...d5 13.Bg5 h6 14.Bxf6 Bxf6 15.exd5 Bxc3 16.bxc3 cxd5 is equal (Duras-Leonhardt, IT, Karlsbad, 1911).

If 7...Bd7 8.Nc3 Bg7 then:

9.Be3 Ng4 10.d5 Nxe3 11.fxe3 gives White the advantage in space (Duras-Spielmann, IT, Prague, 1908).
9.dxe5 Nxe5 10.Nxe5 dxe5 11.Bg5 Bxa4 12.Qxa4+ Qd7 13.Qb4 0-0-0 14.0-0 is equal (Duras-Leonhardt, IT, Prague, 1908). /end Duras Variation

(Worrall Opening) If 5.Qe2 (or 5.0-0 Be7 6.Qe2 b5 7.Bb3 d6 8.c3 0-0) then:

If 5...b5 6.Bb3 then:

If 6...Be7 7.c3 0-0 then:

If 8.d4 d6 then:

If 9.Nbd2 then:

If 9...Re8 10.Ng5 Rf8 11.dxe5 dxe5 is equal (Tiviakov-Nikolic, Op Rd 9, Leiden, 2011).
9...h6 10.d5 Na7 11.a4 c6 12.axb5 axb5 13.dxc6 Be6 14.Nh4 d5 is equal (Baklan-Nikolic, Bundeslinga 0708, Germany, 2007).
9...exd4 10.cxd4 Bg4 11.Qe3 Na5 12.Bc2 c5 13.0-0 cxd4 14.Nxd4 Rc8 is equal (Calzetta Ruíz-Kachiani, Euro ChTW, Crete, 2007).

More usual is 9.0-0 Bg4 10.Rd1 when:

If 10...exd4 11.cxd4 d5 12.e5 Ne4 then:

If 13.Nc3 Nxc3 14.bxc3 Qd7 15.h3 then:

15...Bh5 6.g4 Bg6 17.Ne1 Na5 18.Bc2 Qc6 19.Be3 Bxc2 20.Qxc2 Nc4 gives Black the advantage in space (Spassky-Szabo, Match, Goteborg, 1955).
15...Bf5 16.Nh2 Na5 17.Nf1 Nxb3 18.axb3 a5 gives Black the advantage in space, but the blast c3c4 can put a dent in it (J. Polgar-N. Kosintseva. Rpd, Cap d'Agde, 2010).

If 13.a4 b4! 14.a5 Kh8 15.h3 Bh5 16.Be3 f5 then:

If 17.Rc1 f4! 18.Rxc6 fxe3 19.fxe3 Bh4 gives Black a slight advantage in space and a dangerous tactical initiative with the threat of 20...Bxf3! (Adams-Wells, Op, London, 1993)
a) 17.exf6?! Bxf6! 18.g4 Bg6 19.Nbd2 Qd6 20.Nf1 Rae8 gives Black a huge advantage in space (B. Ivanovic-Lazic, Yugoslav Ch, Tivat, 1994). If now 21.Qxa6? then Black wins a piece after 21...Nxd4! 22.Qxd6 Nxf3+ 23.Kg2 Nh4+ 24.Kh1 cxd6.
If b) 17.Qc2 Nb8 then:

If 18.Bf4! Ra7 19.Rd3 Bxf3 then:

If 20.gxf3 c6 21.Be3 Ng5 22.f4 Nf3+ 23.Kf1 Rb7 is equal.
20.Rxf3 c5 21.dxc5 Bxc5 22.Nd2 Rc7 23.Qd3 Nc6 gives Black a small advantage in space

18.Qc1?! c6! 19.Re1 c5 20.Bd1 c4 21.Nh2 f4 gives Black the initiative and a significant advantage in space.

10...Qc8 11.h3 Bh5 12.a4 Rb8 13.axb5 axb5 14.Bg5 h6 15.Be3 gives White a small advantage in space (J. Polgar-Short, Amber Blind, Monte Carlo, 1993).

9.h3 Nd7 10.0-0 Bf6 11.Rd1 then:

11...Na5 12.Bc2 c5 13.dxc5 dxc5 14.Nbd2 Qc7 15.Nf1 Nb6 16.Ne3 g6 17.a4 gives White a slight advantage in that he is more ready to exploit the Black weakness at d5 than White is to exploit the White weakness at d3 (Taimanov-Flohr, Soviet Ch, Moscow, 1949).
11...Bb7 12.d5 Ne7 13.Be3 then:

13...Ng6 14.a4 Nc5 15.Bxc5 dxc5 16.axb5 Nf4 17.Qe3 Qe7 18.bxa6 Bxa6 19.Kh2 gives White an extra pawn, a passed pawn and healthier pawns (Ragozin-Sakharov, Soviet Ch ½-final, Kiev, 1950).
13...Nb6 14.Na3 Qd7 15.Qd2 a5 16.Bc2 Nbc8 17.c4 gives White the advantage in space (Ragozin-Furman, Soviet Ch, Moscow, 1949).

9.d5 Na5 10.Bc2 c6 11.dxc6 Nxc6 12.0-0 Qc7 is equal.

(Worrall Opening/Marshall Gambit) If 8.0-0 then:

If 8...d5 9.d3 Bb7 10.Rd1 Re8 then:

If 11.Nbd2 Bf8 then:

If 12.Nf1 then:

If 12...Na5 13.Bc2 c5 14.Ng3 then:

14...Qb6 15.a3 c4 16.dxc4 dxe4 17.Nxe4 Nxe4 18.Bxe4 Bxe4 19.Qxe4 Nxc4 is equal (Mamedov-Akopian, Euro Ch, Plovdiv, 2008).
14...g6 15.h4 Qb6 16.h5 c4 17.Bg5 Rac8 18.hxg6 hxg6 is equal (Short-Fernández García, ZT, Marbella, 1982).

12...h6 13.Ng3 Na5 14.Bc2 c5 15.h3 g6 16.Nh2 Qe7 is equal (Jobava-Ravi, Op, Dubai, 2002).

12.a3 Nb8 13.Nf1 h6 14.Ng3 Nbd7 15.Ba2 c5 gives Black a slight edge in space (Conquest-Hawkins, British Ch, Torquay, 2009).

If 11.Bg5 Na5 12.Bc2 h6 then:

13.Bh4 Nd7 14.Bg3 Bf6 15.Nbd2 d4 16.cxd4 exd4 is equal (Tiviakov-I. Ibragimov, Soviet Ch, Moscow, 1991).
13.Bxf6 Bxf6 14.Nbd2 c5 15.exd5 Qxd5 16.Re1 Rac8 17.a3 draw (Safarli-Fressinet, Euro Ch, Budva, 2009).

If 8...d6 then:

9.Rd1 Bg4 10.d4 exd4 11.cxd4 transposes into the main line of the notes to White's ninth move, below.
9.d4 exd4 10.cxd4 Bg4 11.Rd1 also transposes.

(Worrall Opening/Neo-Classical Defense) If 6...Bc5 then:

If 7.c3 0-0 8.0-0 then:

If 8...d6 then:

If 9.d3 h6 10.Be3 Bxe3 then:

11.Qxe3 Na5 12.Bc2 c5 13.Nbd2 Nc6 14.a4 Rb8 15.axb5 axb5 is equal (Tiviakov-Shirov, IT, Hoogeveen, 2010).
11.fxe3 Be6 12.Bc2 Ne7 13.Nh4 Ng6 14.Nf5 d5 gives Black stronger pawns and more space (Sedlack-Miton, Kostic Mem, Vrsac, 2008).

If 9.Rd1 then:

If 9...Bb6 10.h3 h6 11.d3 then:

If 11...Re8 12.Nbd2 d5 then:

If 13.exd5 Nxd5 14.Qe4 Be6 15.Nxe5 Na5 16.Bxd5 Bxd5 17.Qf4 gives White an extra pawn and a better center; Black has a little more space (Radocaj-Dokmanovic, Croatian ChT, Pula, 2001).
If 13.Nf1 Be6 14.Ng3 a5 then:

If 15.d4 exd4 16.e5 Ne4 17.Nxe4 dxe4 then:

18.Bxe6 Rxe6 19.Qxe4 Nxe5 20.Nxe5 f6 21.Qg6 Rxe5 22.Bxh6 gives White the threat of mate in one, a pin in the d-file and more space (Lovkov-Romanov, Russian ChU20, St. Petersburg, 2008).
18.Qxe4 Bxb3 19.axb3 Nxe5 20.Nxe5 f6 21.Bf4 fxe5 22.Bxe5 gives White the advantage in space, a pin in the d-file and more space.

15.exd5 Bxd5 16.Ne4 Bxb3 17.axb3 Qe7 18.Be3 Bxe3 gives Black a small advantage in space.

11...Qe7 12.Nbd2 Nh5 13.Nf1 Nf4 14.Bxf4 exf4 15.d4 gives White a fortified center duo, stronger pawns and more space; Black's pawns keep White from making easy progress and Black soon equalizes (Barlov-Chiburdanidze, IT, Henige, 1988).

If 9...Qe7 then:

10.h3 Bb7 11.d3 Bb6 12.Nbd2 Nh5 13.Nf1 Qf6 14.g3 Na5 is equal (Gauldants-Fishbein, IT, Moscow, 1989).
10.d4 Bb6 11.Bg5 Nd8 12.Nh4 Ne6 13.Nf5 Qe8 14.Bxf6 gxf6 15.Bxe6 draw (Yates-Rubinstein, IT, Budapest, 1926).

If 8...d5 then:

If 9.d3 then:

9...d4 10.Bg5 h6 11.Bh4 Qd6 12.Nbd2 Nh5 gives Black the advantage in space (Zdebskaja-van Weersel, OlW, Dresden, 2008).
9...dxe4 10.dxe4 Bd6 11.Rd1 Qe8 12.h3 Ne7 is equal (Safarli-Ruijgrok, Op, Hoogeveen, 2007).

9.d4?! exd4! 10.cxd4 dxe4 11.dxc5 Bg4 12.Be3 exf3 13.gxf3 Bh5 gives Black command of open attacking lanes, a nasty pin at f3 and more space; she soon wins (Partac-Deseatnicov, Op, Kishnev, 2001).

If 7.a4 Rb8 8.axb5 axb5 9.Nc3 0-0 then:

If 10.d3 d6 11.Bg5 then:

11...h6 12.Bxf6 Qxf6 13.Nd5 Qd8 14.0-0 b4 15.h3 Kh8 is equal (Bogoljubow-Eliskases, Match, Nuremburg, 1939).
11...Bg4 12.Nd5 Nd4 13.Nxd4 Bxe2 14.Bxf6 Ra8 15.Kxe2(Levenfish-Flamberg, Vilnius, 1912).

If 10.0-0 b4 11.Nd5 d6 then:

12.d3 Bg4 13.Be3 Nd4 14.Bxd4 Bxd4 15.Ra2 Nh5 is equal (Zukertort-Winawer, IT, Paris, 1878).
12.h3 Nxd5 13.Bxd5 Ne7 14.Bc4 Ng6 15.d3 Qf6 is equal (Thomas-Rubinstein, IT, Karlsbad, 1923).

If 5.0-0 then:

5...Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 is the Grand Spanish Main Line.
5...Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 is the Gothic Defense, commonly called the Open defense.

5...Be7

If 5...b5 6.Bb3 then:

(Arkhangelsk Defense) If 6...Bb7 then:

If 7.d4 Nxd4 then:

If 8.Nxd4 exd4 9.e5 Ne4 10.c3 then:

If 10...d3 then:

If 11.Qxd3 Nc5 12.Qg3 Nxb3 13.axb3 Qe7 then:

14.b4 Qe6 15.Be3 d6 16.f4 h5 17.h3 0-0-0 18.Nd2(Bogdanovic-Planinc, IT, Sarajevo, 1970).
If 14.Bg5 Qe6 then:

If 15.f4?! then:

If 15...f6?! 16.exf6 then:

16...Bc5+?! 17.Kh1! gxf6 18.Re1 0-0-0!! 19.Rxe6 dxe6 20.Qe1 fxg5 21.Nd2 gives Black greater activity for his pieces; White a material advantage (Ljubojevic-Planinc, IT, Vrsac, 1971).
16...Qb6+ 17.Kh1 gxf6 18.Bh4 0-0-0 19.Nd2 Re8 is equal.

15...Qxb3 16.Qf2 Qd5 gives Black an extra pawn.

15.Nd2 Qg6 16.b4 remains equal.

If 11.Qf3 Qe7 12.Nd2 then:

12...Nc5 13.Bd5 Bxd5 14.Qxd5 c6 15.Qd4 d6 16.b4 Ne6 17.Qxd3 dxe5 leaves Black with an extra pawn (Atunes-Arencibia, Op, Seville, 1990).
12...0-0-0 13.Nxe4 Qxe5 14.Re1 f5 15.Qg3 Qe8 16.Nd6+ Bxd6 17.Rxe8 Rhxe8 18.Bf4 d2 gives White a material advantage; Black has a danerous passer (Minic-Planinc, IT, Rovin/Zagreb, 1975).

If 10...dxc3 11.Qf3 d5 12.exd6 Qf6 then:

If 13.Re1 0-0-0 then:

14.dxc7 Rd7 15.Qxf6 gxf6 16.Nxc3 leaves White with an extra pawn (Tseshkovsky-Beliavsky, ZT, Lvov, 1978).
14.Qxf6 Nxf6 15.dxc7 Kxc7 16.Nxc3 Bc5 17.Bf4+ Kb6 is equal (B. Ivanovic-Vujosevic, Yugoslav Ch. Kladovo, 1992).

13.d7+ Kd8 14.Qxf6+ Nxf6 15.Nxc3 Bd6 16.Bxf7 Kxd7 17.Re1 c5 gives Black the advantage in space (Kremer-Chiburdanidze, Op, Brussels, 1986).

If 8.Bxf7+ Kxf7 9.Nxe5+ then:

If 9...Kg8 10.Qxd4 c5 11.Qd1 Qe8 12.Nf3 Qxe4 then:

If 13.Bg5 Qf5 then:

14.Bxf6 Qxf6 15.Nc3 Rd8 16.Re1 d5 gives Black the Bishop pair against two Knights; White has a slight advantage in space (E. Atalik-Olarasu, Euro ChW, Warsaw, 2001).
14.Nbd2 Ne4 15.Bh4 h6 16.Bg3 g5 is equal (Moriuchi-S. Muhammad, Op, Philadelphia, 2006).

13.Re1 Qg4 14.a4 Bxf3 15.Qxf3 Qxf3 16.gxf3 b4 gives Black stronger pawns and White more freedom (Eley-Mistel, Masters 7273, Hastings, 1972).

9...Ke6 10.Qxd4 c5 11.Qc3 Nxe4 12.Qe1 d6 13.Nd2 gives White a slight advantage.

If a) 7.d3 then:

7...Be7 8.Nc3 0-0 then:

If 9.Bd2 d6 then:

If 10.a4!? then:

If 10...Na5 11.Ba2 b4 then:

If 12.Nd5 Nxd5 13.exd5 c5 14.c3 then:

If 14...bxc3 15.Bxc3 Bc8 then:

16.Qe1 Nb7 17.a5 Bg4 18.Nd2 Nxa5 19.f4 exf4 20.Rxf4 Bh5 gives Black an extra pawn (Kuzmin-Malaniuk, Ukrainian Ch, Kharkov, 2004).
16.b4 cxb4 17.Bxb4 Bg4 18.h3 Bh5 19.Re1 Rb8 is equal (Watson-Chiburdanidze, IT, Frunze, 1985).

14...b3 15.Bxb3 Nxb3 16.Qxb3 Rb8 17.Rab1 Qd7 18.Rfe1 gives White an extra pawn and more space (A. Zhigalko-van der Wiel, Op, Groningen, 2005).

If 12.Ne2 then:

12...d5 13.exd5 Bxd5 14.Bxd5 Qxd5 15.Ng3 Rfe8 is equal (Tukmakov-Planinc, IT, Madrif, 1973).
12...c5 13.Ng3 Rb8 14.Nf5 Bc8 15.N3h4 Be6 is equal (Topalov-Beliavsky, EU ChT, Batumi, 1999).

If 10...Nd4 11.Nxd4 exd4 then:

If 12.Ne2 c5 13.Ng3 d5 then:

14.e5 Nd7 15.Re1 Re8 16.Qf3 Nf8 17.Nf5 Ne6 18.c3 dxc3 19.bxc3 Bf8 20.Qg4 gives White some initiative(Gallagher-Lenic, Euro Ch, Rijeka, 2010).
14.axb5 axb5 15.Rxa8 Bxa8 16.e5 gives White the initiative and more space (Matulovic-Malich, IT, Sarajevo, 1965).

12.Nd5 Bxd5 13.Bxd5 Nxd5 14.exd5 Qd7 15.Re1 Bf6 is equal (Navara-Mikhalchishin, Euro ChT, León, 2001).

10.Nd5! Nxd5 11.Bxd5 Rb8 12.c3 Bf6 13.a4 Ne7 continues to give White the advantage in space (Khairullin-Khalifman, Aeroflot Op, Moscow, 2006).

9.Re1 d6 10.a4 is the Kasparov Opening, mostly used as an Anti-Marshall Line; see the red notes to White's eighth move in Hou Yifan-A. Muzychuk, elswhere on this thread.

If 7...Bc5 8.a4 0-0 9.Nc3 then:

If 9...b4 10.Nd5 h6 then:

If 11.Be3 d6 12.Qd2 then:

12...Nxd5 13.Bxd5 Qf6 14.Bxc5 dxc5 15.Bxc6 Bxc6 16.Qe3 gives White healthier pawns, the initiative and a slight advnatage in space; Black has a local advantage on the queenside, but she must protect the foremost c-pawn (Bergsson-Houska, Masters 0506, Hastings, 2006).
12...Bxe3!? 13.Nxf6+! Qxf6 14.fxe3 Qd8 15.a5 Rb8 16.Qf2 gives White a small advantage in space (Kurnosov-Pakken, Rilton Cup 0506, Stockholm, 2005).

If 11.a5 d6 12.c3 Rb8 13.Bd2 bxc3 14.bxc3 gives White a better center and a small advantage in space (Timman-Bareev, IT A, Wijk aan Zee, 1995).

If 9...Na5 10.axb5 Nxb3 11.cxb3 then:

If 11...axb5 12.Rxa8 Bxa8 13.Nxe5 d5 14.Bg5 then:

If 14...dxe4 15.dxe4 Qxd1 16.Rxd1 b4 then:

17.Bxf6 bxc3 18.bxc3 gxf6 19.Nd7 Bd6 20.Nxf8 Kxf8 21.f3 h5 22.h4 Ke7 23.Kf2 Bb7 24.c4 Be5 gives White the material edge (Kasparov-Kramnik, World Ch Match, London, 2000).
17.Nd5 Bxf2+ 18.Kxf2 Nxe4+ 19.Kg1 Nxg5 20.Nd7 Rd8 21.Nxc7 Kh8 22.Nxa8 Rxa8 23.Rd4 gives White the active Rook for the endgame (Topalov-Shirov, Amber Blind, Monte Carlo, 1997).

14...Be7 15.Nxb5 dxe4 16.dxe4 Bxe4 17.Nc3 Bb7 18.Re1 gives White an extra pawn and a small edge in space (Kasparov-Shirov, IT, Linares, 1998).

11...Qe7 12.Bg5 axb5 13.Rxa8 Rxa8 14.Nxb5 Bb6 15.Nc3 is equal (Benjamin-S. Muhammad, Op, Minneapolis, 2005).

b) 7.Re1 Bc5 8.c3 d6 9.d4 Bb6 then:

If 10.Bg5 h6 then:

If 11.Bh4 then:

If 11...0-0 12.a4 Re8 13.axb5 axb5 14.Rxa8 Bxa8 then:

If 15.Qd3 Na5 16.Bc2 then:

16...exd4 17.Bxf6 Qxf6 18.cxd4 g5 19.h3 gives White a better center; Black has the Bishop pair and more space (Tukmakov-Dorfman, Soviet Army ChT, Leningrad, 1975).
16...c6 17.Nbd2 Qe7 18.b4 Nb7 19.Nf1 gives White the better center and more space (Kostro-Witkowski, IT B, Wijk aan Zee, 1971).

If 15.d5 then:

If 15...Na7 then:

16.Na3 g5 17.Bg3 Nh5 18.Nc2 Bb7 19.Ne3 Bc8 is equal (Anand-Ivanchuk, World Youth, Shartjah, 1985).
16.Bxf6 Qxf6 17.Na3 g5 18.Qe2 Bb7 19.Nc2 Qf4gives White good chance to win the b-pawn; otherwise, Black has the best Bishop on the board (his "bad" Bishop, no less) and more space (Timmerman-Pioch, Corres, 1994).

15...Na5 16.Ba2 c6 17.Bxf6 Qxf6 18.Na3 Rc8 19.b4 Nc4 20.Bxc4! bxc4 21.Nxc4 wins a pawn for White (Tringov-Smederevac, IT, Osijek, 1978).
15...g5 16.dxc6 gxh4 17.Bd5 Nh5 18.Na3 Qf6 19.Nxb5 gives White an extra pawn.

If 11...g5 12.Bg3 then:

If 12...0-0 13.a4 Re8 14.Qd3 then:

If 14...Na5 15.Ba2 then:

If 15...Nc4?! 16.b3! g4 17.bxc4 gxf3 18.gxf3 b4 19.c5! opens the a2/g8 diagonal for White (Rujevic-Stead, ZT, Gold Coast, Australia, 2001).
If 15...bxa4! then:

16.Nfd2 Qd7 17.d5 Nh5 18.Na3 Qg4 is equal.
16.d5 Rb8 17.Na3 Nh5 18.Nd2 Bc8 19.Nac4 Qf6 is equal.

If 14...exd4?! 15.e5! then:

15...dxe5 16.Qg6+ Kh8 17.Qxh6+ Nh7 18.Bxf7 Qf6 19.Qxf6+ Nxf6 20.Bxe8 Rxe8 21.axb5 axb5 22.Nbd2 gives White the exchange; Black has more space (Rezaei-Magai, TT, Kuala Lampur, 1994).
15...Ng4 16.Qg6+ Kh8 17.Bxf7 dxe5 18.h3 Ne7 19.Bxe5+ Black resigns before he is mated (Klarides-Gandy, EU ChT, Plovdiv, 2003).

If 12...Qe7?! then:

If 13.a4!? h5 14.axb5 axb5 15.Rxa8+ Bxa8 16.h4 g4 then:

If 17.Ng5! Nd8 18.f4 Nd7 19.f5 then:

If 19...Nf8 20.f6 Qxf6 21.Nxf7 Nxf7 22.Rf1 Qh6 23.Bxf7+ gives White the initiative and the advantage in space; Black is threatening the pawn at e5 (Vasiukov-Kuzmin, Op, Leningrad, 1991).
If 19...f6!? 20.Ne6 Nxe6 21.Bxe6 Nf8 22.Bb3 gives White a comfortable advantage in space (Rezaei-Vasiukov, Op, Tehran, 1991).

If b1) 17.dxe5?! then:

If 17...dxe5! then:

If 18.Ng5!? then:

If 18...Nd8 then:

19.Ba2 Nd7 20.Qb3 Bc6 Black's f-pawn holds, leaving Black with the advantage in space (Fernández García-Chiburdanidze, IT, Salamanca, 1990).
19.Bxe5 Qxe5 20.Qxd8+ Kxd8 21.Nxf7+ Kc8 22.Nxe5 leaves White with two extra pawns (Fritz).

18.Nfd2 Na7 19.Na3 0-0 20.Bc2 Rd8 21.Qe2 Bc6 is equal (Rybka).

17...Nxe5 18.Ng5 0-0 19.Na3 Qd7 20.Qe2 Bc6 21.Nc2 gives White a small advantage (Rybka).

If b2) 17.Nh2 exd4!? 18.Nf1 then:

If 18...0-0?! then:

19.Bf4?! Nxe4 20.Ng3 Nxf2!! 21.Kxf2 Qf6 22.Nxh5 Qxh4+ gives White domination of the dark squares in the vacinity of the White King, which has been stripped of its pawn protection (T. Ernst-Shirov, Op, Guasdal, 1991).
If 19.Qc1! Ne5 20.Qg5+! then:

20...Kh7 21.Bf4 Kh8 22.Ng3 is equal.
20...Kh8 21.Nbd2 dxc3 22.bxc3 Bb7 23.Ne3 is equal.

18...Kf8 19.Bc2 b4 20.Bf4 dxc3 21.bxc3 Ne8 is equal.
18...dxc3 19.Nxc3 Ne5 20.Ne3 Bxe3 21.Rxe3 is equal.

If 13.Nbd2! 0-0 14.Bd5 exd4 15.Nxd4 Qd7 16.Nf5 gives White a better center, the initiative a small advantage in space (Rybka).

If 10.Be3 0-0 11.Nbd2 h6 12.h3 then:

If 12...Re8 then:

If 13.d5 Ne7 14.Bxb6 cxb6 15.Bc2 Ng6 then:

If 16.Bd3 Bc8 17.a4 bxa4 18.Qxa4 gives White a hole to exploit at c6 and more space overall (Zdebskaja-Sachdev, Op, Copenhagen, 2009).
16.Nf1 Nf4 17.Ne3 Bc8 18.Kh2 g6!? 19.Kg1 gives White more freedom; try to find a good, safe square for Black's Knight at f4 (Anisimov-Halkias, Euro Ch, Budva, 2009).

If 13.Qb1 Nb8 14.Bc2 Nbd7 15.a4 d5 16.dxe5 Bxe3 17.Rxe3 Nxe5 is equal (Wedberg-Hector, Swedish Ch, IT, Malmö, 2002).

If 12...exd4 13.cxd4 Nb4 14.Qb1 c5 15.a3 Nc6 16.e5 dxe5 17.dxc5 Bc7 18.Rd1 Na5 19.Ba2 Bd5 20.b4 gives White the initiative and a slight adge in space (Karavade-Nadig, World Jr Ch, Istanbul, 2005).

(Neo-Classical Defense or Møller Defense) If 6...Bc5 7.c3 d6 then:

If 8.a4 then:

If 8...Rb8 9.d4 Bb6 then:

If 10.axb5 axb5 11.Na3 0-0 12.Nxb5 Bg4 then:

If 13.d5 Ne7 14.Bc2 Qd7 15.Na3 Nexd5 16.h3 Bh5 17.exd5 e4 18.Bg5 Bxf3 19.Qd2 e3! (White is better, but this pawn sac is still Black's shot) 20.Bxe3 Bxe3 21.fxe3 gives White an extra pawn and Black more space (Nakamura-Shirov, IT A, Wijk aan Zee, 2011).
If a) 13.Be3 exd4 14.cxd4 Nxe4 15.Qc2 Qe8 16.Ba4 Bd7 then:

17.Nc3 Nxc3 18.bxc3 Ne7 19.c4 c6 20.Rae1 Qd8 21.Bg5 gives White a small advantage in space (Domínguez-Shirov, IT, Sofia, 2009).
17.Rfe1 Nb4 18.Qc4 Ba5 19.Nc3 Bxa4 20.Rxa4 d5 21.Qf1 Nc6 draw (Leko-Anand, World Ch Trmt, Mexico City, 2007).

If b) 13.Bc2 Bxf3 14.gxf3 Nh5 15.f4 then:

15...Qh4 16.Qf3 Nxf4 17.Bxf4 exf4 18.Kh1 Ne7 19.Rg1 Ng6 20.b4 Qe7 21.Na7 gives White the advantage in space (Kamsky-Friedel, US Ch, St. Louis, 2009).
15...Nxf4 16.Bxf4 exf4 17.Qg4 Qf6 18.b4 Ne7 19.Na3 Ng6 20.Nc4 gives White the advantage in space (Leko-Shirov, Tal Mem, Moscow, 2007).

If c) 13.Re1 Bxf3 14.gxf3 Nh5 15.Kh1 then:

If 15...exd4 16.Nxd4 Nxd4 17.cxd4 c5 18.Rg1 cxd4 then:

19.Bg5 Qe8 20.Qd3 Bd8 21.Bd2 Qe5 22.Rg4 Qb5 23.Bc4 Qxb2 24.Rag1 Kh8 gives Black an extra pawn (Short-Ganguly, World Cup, Hyderabad, 2002).
19.Rg5 g6 20.f4 Kh8 21.f5 gives White the advantage in space (Svidler-Shirov, Euro ChT, Novi Sad, 2009).

15...Qf6 16.Rg1 Nf4 17.Be3 Ne6 18.Bxe6 fxe6 19.Rg3 Kh8 20.Qd3 exd4 21.cxd4 e5 22.d5 gives White the advantage in space (Svidler-Shirov, IT, Linares, 1998).

If 10.a5 Ba7 11.h3 0-0 12.Be3 then:

If 12...Ra8 13.Nbd2 Bb7 14.Re1 then:

If 14...exd4 15.cxd4 Nb4 16.Bg5 h6 17.Bh4 Nd3 18.Re3 Nf4 then:

19.Rc1 c5 20.e5 dxe5 21.dxe5 is equal (Navara-Ragger, Euro Ch, Rijeka, 2010).
19.Bc2 Ng6 20.Bg3 c5 21.Nf1 Re8 leaves Black threatening White's e-pawn (Sebag-Harika, ITW, Hangzhou, 2011).

14...h6 15.Bc2 Re8 16.d5 Ne7 17.Nf1 Ng6 18.N3h2 is equal (T. Kosintseva-Munguntuul, Grand Prix W, Ulaanbaatar, Mongolia, 2010).

If 12...exd4 13.cxd4 Nxe4 then:

If 14.Qc2 Qe8 15.Nc3 then:

15...Nf6 16.Rfe1 Qd7 17.Ne4 Nxe4 18.Qxe4 is equal (Timofeev-Halkias, Euro Ch, Dresden, 2007).
15...Nxc3 16.Qxc3 Ne7 17.Rac1 c6 18.Rfe1 is equal (Nijboer-Bok, Dutch Ch, Eindhoven, 2010).

14.Bd5 Qe8 15.Re1 Nf6 16.Nc3 Nb4 17.Bb3 Qd7 gives Black an advantage in pawn structure; White has an isolated d-pawn (Christiansen-Zilberstein, US Ch, San Diego, 2004).

8...Bb7 9.d4 Bb6 10.Re1 0-0 11.Bg5 h6 12.Bh4 Re8 transposes into Tukmakov-Dorfman, Soviet Army ChT, Leningrad, 1975, above in this set of variations.

If 8.d3 then:

If 8...0-0 then:

If 9.Nbd2 then:

If 9...h6 then:

If 10.Re1 then:

If 10...Re8 11.h3 Bb7 12.Nf1 then:

12...d5 13.exd5 Nxd5 14.Ng3 Nf6 15.Be3 Bf8 16.Rc1 Na5 gives Black a slight advantage in space (Mudongo-Mira, OlW, Torino, 2006).
12...Bb6 13.Be3 Bxe3 14.Nxe3 Na5 15.Bc2 d5 16.exd5 Nxd5 is equal (Otorbaeva-Al Ali, OlW, Khanty-Mansiysk, 2010).

10...Ne7 11.Nf1 Ng6 12.Ng3 Re8 13.h3 Bb7 14.Nh2 is equal (McShane-Tkachiev, IT B, Wijk aan Zee, 2011).

10.h3 Bb6 11.Re1 Re8 12.Nf1 Be6 13.Bc2 d5 14.exd5 Qxd5 15.a4 Rad8 draw (Dr. Nunn-Turner, IT, Oxford, 1998).

If 9.Bg5 h6 10.Bh4 g5 11.Bg3 Bg4 12.Nbd2 Rb8 13.Re1 Nh5 14.h3 Bxf3 15.Qxf3 Nxg3 16.Qxg3 gives White more freedom (Akopian-I. Sololov, Masters', Gibraltar, 2007).

8...Bb7 transposes into the Arkhangelsk Defense at Bergsson-Houska, Masters 0506, Hastings, 2006, above. /end Neo-Classical Defense

7.Re1 d6 8.c3 Bb7 transposes into Zdebskaja-Sachdev. Op, Copenhagen, 2009, above.

5...Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 is the Gothic Defense, more commonly called the Open Defense. See Fier-A. Vovk, Dutch Op, Dieren, 2011, elsewhere on the thread.

6.Re1

6.Qe2 is the Worrall Opening, above.

Continued in part 3 (next post)

Reply #4: van den Doel -Nikolic, part 2 of 4 [View All]