C00
French defence 1.e4 e6

French defence, Steiner variation
2.c4

















French, Reti (Spielmann) variation
2.b3
French, Steinitz attack
2.e5
French, Labourdonnais variation
2.f4
French defence (2.Nf3)
2.Nf3
French, Wing gambit
2...d5 3.e5 c5 4.b4
French defence (2.Nc3)
2.Nc3
French, Pelikan variation
2...d5 3.f4
French, Two knights variation
2...d5 3.Nf3
French, Chigorin variation
2.Qe2
French, King's Indian attack
2.d3
French, Reversed Philidor formation
2...d5 3.Nd2 Nf6 4.Ngf3 Nc6 5.Be2
French defence (2.d4)
2.d4
Lengfellner system
2...d6
St. George defence
2...a6
French defence (2...d5)
2...d5
French, Schlechter variation
3.Bd3
French, Alapin variation
3.Be3
C01
French, exchange variation 1.e4 e6 2.d4 d5 3.exd5

French, exchange, Svenonius variation
3...exd5 4.Nc3 Nf6 5.Bg5

French, exchange, Bogolyubov variation
5...Nc6
C02
French, advance variation
1.e4 e6 2.d4 d5 3.e5

French, advance, Steinitz variation
3...c5 4.dxc5

French, advance, Nimzovich variation
3...c5 4.Qg4

French, advance, Nimzovich system
3...c5 4.Nf3

French, advance variation (3...c5 4.c3)
3...c5 4.c3

French, advance, Wade variation
1.e4 e6 2.d4 d5 3.e5 c5 4...Qb6 5.Nf3 Bd7

French, advance variation (4...Qb6 5.Nf3 Bd7)
4...Nc6

French, advance, Paulsen attack
5.Nf3

French, advance, Milner-Barry gambit
5...Qb6 6.Bd3

French, advance, Euwe variation
 5...Bd7
C03
French, Tarrasch 1.e4 e6 2.d4 d5 3.Nd2

French, Tarrasch, Haberditz variation
3...f5

French, Tarrasch, Guimard variation
3...Nc6
C04 French, Tarrasch, Guimard main line
1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6
C05
French, Tarrasch, closed variation
1.e4 e6 2.d4 d5 3.Nd2 Nf6

French, Tarrasch, Botvinnik variation
4.e5 Nfd7 5.Bd3 c5 6.c3 b6

French, Tarrasch, closed variation (4.e5)
6...Nc6
C06 French, Tarrasch, closed variation, main line
1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6 7.Ne2 cxd4 8.cxd4

French, Tarrasch, Leningrad variation
8...Nb6
C07
French, Tarrasch, open variation
1.e4 e6 2.d4 d5 3.Nd2 c5

French, Tarrasch, Eliskases variation
4.exd5 Qxd5 5.Ngf3 cxd4 6.Bc4 Qd8

C08
French, Tarrasch, open, 4.ed ed
1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5
C09
French, Tarrasch, open variation, main line
1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Ngf3 Nc6
C10
French, Paulsen variation
1.e4 e6 2.d4 d5 3.Nc3

French, Marshall variation
3...c5

French, Rubinstein variation
3...dxe4

French, Fort Knox variation
 4.Nxe4 Bd7 5.Nf3 Bc6

French, Rubinstein variation (4.Nxe4 Nd7)
4...Nd7

French, Rubinstein, Capablanca line
5...Ngf6 6.Nxf6+ Nxf6 7.Ne5

French, Frere (Becker) variation
4...Qd5
C11
French defence 1.e4 e6 2.d4 d5 3.Nc3 Nf6

French, Swiss variation
4.Bd3

French, Henneberger variation
4.Be3

French, Steinitz variation
4.e5

French, Steinitz, Bradford attack
4... Nfd7 5.f4 c5 6.dxc5 Bxc5 7.Qg4

French, Steinitz variation (6...Nc6)
6...Nc6

French, Steinitz, Brodsky-Jones variation
7.a3 Bxc5 8.Qg4 O-O 9.Nf3 f6

French, Steinitz variation (6.Nf3)
4... Nfd7 5.f4 c5 6.Nf3

French, Steinitz, Boleslavsky variation
6...Nc6 7.Be3

French, Steinitz, Gledhill attack
4... Nfd7 5.Qg4

French, Burn variation
4.Bg5 dxe4
C12
French, MacCutcheon variation
1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4

French, MacCutcheon, Bogolyubov variation
5.exd5 Qxd5 6.Bxf6 gxf6 7.Qd2 Qa5

French, MacCutcheon, advance variation
5.e5

French, MacCutcheon, Chigorin variation
5... h6 6.exf6

French, MacCutcheon, Grigoriev variation
6...hxg5 7.fxg7 Rg8 8.h4 gxh4 9.Qg4

French, MacCutcheon, Bernstein variation
5...h6 6.Bh4

French, MacCutcheon, Janowski variation
5...h6 6.Be3

French, MacCutcheon, Dr. Olland (Dutch) variation
5...h6 6.Bc1

French, MacCutcheon, Tartakower variation
5...h6 6.Bd2 Nfd7

French, MacCutcheon, Lasker variation
5...h6 6.Bd2 Bxc3

French, MacCutcheon, Duras variation
7.bxc3 Ne4 8.Qg4 Kf8 9.Bc1

French, MacCutcheon, Lasker variation, 8...g6
7.bxc3 Ne4 8.Qg4 g6
C13
French, classical
1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7

French, classical, Anderssen variation
5.Bxf6

French, classical, Anderssen-Richter variation
5...Bxf6 6.e5 Be7 7.Qg4

French, classical, Vistaneckis (Nimzovich) variation
5.e5 Ng8

French, classical, Frankfurt variation
6.Be3 b6

French, classical, Tartakower variation
5.e5 Ne4

French, Albin-Alekhine-Chatard attack
5.e5 Nfd7 6.h4

French, Albin-Alekhine-Chatard attack, Maroczy variation
6...a6

French, Albin-Alekhine-Chatard attack, Breyer variation
6...c5

French, Albin-Alekhine-Chatard attack, Teichmann variation
6...f6

French, Albin-Alekhine-Chatard attack, Spielmann variation
6...O-O
C14
French, classical variation 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7

French, classical, Tarrasch variation
7.Bd3

French, classical, Rubinstein variation
7.Qd2

French, classical, Alapin variation
7.Nb5

French, classical, Pollock variation
7.Qg4

French, classical, Steinitz variation
7.f4

French, classical, Stahlberg variation
7...O-O 8.Nf3 c5 9.Qd2 Nc6 10.O-O-O c4
C15
French, Winawer (Nimzovich) variation
1.e4 e6 2.d4 d5 3.Nc3 Bb4

French, Winawer, Kondratiyev variation
4.Bd3 c5 5.exd5 Qxd5 6.Bd2

French, Winawer, fingerslip variation
4.Bd2

French, Winawer, Alekhine (Maroczy) gambit
4.Nge2

French, Winawer, Alekhine gambit, Alatortsev variation
4...dxe4 5.a3 Be7 6.Nxe4 Nf6 7.N2g3 O-O 8.Be2 Nc6

French, Winawer, Alekhine gambit
 4...dxe4 5.a3 Bxc3+

French, Winawer, Alekhine gambit, Kan variation
6.Nxc3 Nc6
C16
French, Winawer, advance variation
1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5

French, Winawer, Petrosian variation
 4...Qd7
C17
French, Winawer, advance variation
1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5

French, Winawer, advance, Bogolyubov variation
5.Bd2

French, Winawer, advance, Russian variation
5.Qg4

French, Winawer, advance, 5.a3
5.a3

French, Winawer, advance, Rauzer variation
5...cxd4 6.axb4 dxc3 7.Nf3
C18
French, Winawer, advance variation
1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3

French, Winawer, classical variation
6...Qc7
C19
French, Winawer, advance, 6...Ne7 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7

French, Winawer, advance, Smyslov variation
7.a4

French, Winawer, advance, positional main line
7.Nf3

French, Winawer, advance, poisoned pawn variation
7.Qg4

French, Winawer, advance, poisoned pawn, Euwe-Gligoric
7...Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 10.Kd1

French, Winawer, advance, poisoned pawn, Konstantinopolsky
7...Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 10.Ne2
C20
King's pawn game
1.e4 e5

KP, Mengarini's opening
2.d3

KP, King's head opening
2.a3

KP, Patzer opening
2.f3

KP, Napoleon's opening
2.Qh5

KP, Lopez opening
2.Qf3

Alapin's opening
2.c3

Centre game
2.Ne2
C21
Centre game
1.e4 e5 2.d4 exd4

Centre game, Kieseritsky variation
3.Nf3 c5 4.Bc4 b5

Halasz gambit
3.f4

Danish gambit
3.c3

Danish gambit, Collijn defence
3...dxc3 4.Bc4 cxb2 5.Bxb2 Qe7

Danish gambit, Schlechter defence
3...dxc3 4.Bc4 cxb2 5.Bxb2 d5

Danish gambit, Soerensen defence
3... d5

Centre game (3.Qxd4)
3.Qxd4
C22
Centre game
1.e4 e5 2.d4 exd4 3.Qxd4 Nc6

Centre game, Paulsen attack
4.Qe3

Centre game, Charousek variation
4... Bb4+ 5.c3 Be7

Centre game, l'Hermet variation
4... f5

Centre game, Berger variation
4... Nf6

Centre game, Kupreichik variation
5.Nc3 Bb4 6.Bd2 O-O 7.O-O-O Re8 8.Bc4 d6 9.Nh3

Centre game, Hall variation
4.Qc4
C23
Bishop's opening
1.e4 e5 2.Bc4

Bishop's opening, Philidor counter-attack
2... c6

Bishop's opening, Lisitsyn variation
3.d4 d5 4.exd5 cxd5 5.Bb5+ Bd7 6.Bxd7+ Nxd7 7.dxe5 Nxe5 8.Ne2

Bishop's opening, Calabrese counter-gambit
2... f5

Bishop's opening, Calabrese counter-gambit, Jaenisch variation
3.d3

Bishop's opening, Classical variation
2... Bc5

Bishop's opening, Lopez gambit
3.Qe2 Nc6 4.c3 Nf6 5.f4

Bishop's opening, Philidor variation
3.c3

Bishop's opening, Pratt variation
3... Nf6 4.d4 exd4 5.e5 d5 6.exf6 dxc4 7.Qh5 O-O

Bishop's opening, Lewis counter-gambit
3... d5

Bishop's opening, del Rio variation
3... Qg5

Bishop's opening, Lewis gambit
3.d4

Bishop's opening, Wing gambit
3.b4

Bishop's opening, MacDonnell double gambit
3... Bxb4 4.f4

Bishop's opening, Four pawns gambit
4... exf4 5.Nf3 Be7 6.d4 Bh4+ 7.g3 fxg3 8.O-O gxh2+ 9.Kh1
C24
Bishop's opening, Berlin defence
1.e4 e5 2.Bc4 Nf6

Bishop's opening, Greco gambit
3.f4

Bishop's opening, Ponziani gambit
3.d4

Bishop's opening, Urusov gambit
3... exd4 4.Nf3

Bishop's opening, Urusov gambit, Panov variation
4... d5 5.exd5 Bb4+ 6.c3 Qe7+
C25
Vienna game
1.e4 e5 2.Nc3

Vienna, Zhuravlev countergambit
2... Bb4 3.Qg4 Nf6

Vienna game, Max Lange defence
2... Nc6

Vienna, Paulsen variation
3.g3

Vienna, Fyfe gambit
3.d4

Vienna gambit
3.f4

Vienna, Steinitz gambit
3... exf4 4.d4

Vienna, Steinitz gambit, Zukertort defence
4... Qh4+ 5.Ke2 d5

Vienna, Steinitz gambit, Fraser-Minckwitz variation
4... Qh4+ 5.Ke2 b6

Vienna gambit (3...exf4 4.Nf3)
3... exf4 4.Nf3

Vienna, Hamppe-Allgaier gambit
4... g5 5.h4 g4 6.Ng5

Vienna, Hamppe-Allgaier gambit, Alapin variation
6... d6

Vienna, Hamppe-Muzio gambit
4... g5 5.Bc4 g4 6.O-O

Vienna, Hamppe-Muzio, Dubois variation
6... gxf3 7.Qxf3 Ne5 8.Qxf4 Qf6

Vienna, Pierce gambit
4... g5 5.d4

Vienna, Pierce gambit, Rushmere attack
5... g4 6.Bc4 gxf3 7.O-O d5 8.exd5 Bg4 9.dxc6
C26
Vienna, Falkbeer variation
1.e4 e5 2.Nc3 Nf6

Vienna, Mengarini variation
3.a3

Vienna, Paulsen-Mieses variation
3.g3

Vienna game
3.Bc4
C27
Vienna game
1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4

Vienna, Frankenstein-Dracula variation
4.Qh5 Nd6 5.Bb3 Bc6 6.Nb5 g6 7.Qf3 f5 8.Qd5 Qe7 9.Nxc7+ Kd8 10.Nxa8 b6

Vienna, Adams' gambit
4.Qh5 Nd6 5.Bb3 Nc6 6.d4

Vienna game (5...Be7)
4.Qh5 Nd6 5.Bb3 Be7

Vienna, Alekhine variation
6.Nf3 Nc6 7.Nxe5

Boden-Kieseritsky gambit
4.Nf3
 
Boden-Kieseritsky gambit, Lichtenhein defence
4... d5

C28
Vienna game
1.e4 e5 2.Nc3 Nf6 3.Bc4 Nc6
C29
Vienna gambit 1.e4 e5 2.Nc3 Nf6 3.f4 d5

Vienna gambit, Kaufmann variation
4.fxe5 Nxe4 5.Nf3 Bg4 6.Qe2

Vienna gambit, Breyer variation
4.fxe5 Nxe4 5.Nf3 Be7

Vienna gambit, Paulsen attack
4.fxe5 Nxe4 5.Qf3

Vienna gambit, Bardeleben variation
5... f5

Vienna gambit, Heyde variation
6.d4

Vienna gambit (5.d3)
4.fxe5 Nxe4 5.d3

Vienna gambit, Wurzburger trap
5... Qh4+ 6.g3 Nxg3 7.Nf3 Qh5 8.Nxd5

Vienna gambit, Steinitz variation
4.d3
C30
King's gambit
1.e4 e5 2.f4

KGD, Keene's defence
2... Qh4+ 3.g3 Qe7

KGD, Mafia defence
2... c5

KGD, Norwalde variation
2... Qf6

KGD, Norwalde variation, Buecker gambit
3.Nf3 Qxf4 4.Nc3 Bb4 5.Bc4

KGD, classical variation
2... Bc5

KGD, classical, Svenonius variation
1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.Nc3 Nf6 5.Bc4 Nc6 6.d3 Bg4 7.h3 Bxf3 8.Qxf3 exf4

KGD, classical, Hanham variation
1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.Nc3 Nf6 5.Bc4 Nc6 6.d3 Bg4 7.h3 Bxf3 8.Qxf3 exf4

KGD, classical, 4.c3
3.Nf3 d6 4.c3

KGD, classical, Marshall attack
4... Bg4 5.fxe5 dxe5 6.Qa4+

KGD, classical counter-gambit
4... f5

KGD, classical, Reti variation
5.fxe5 dxe5 6.d4 exd4 7.Bc4

KGD, classical, Soldatenkov variation
3.Nf3 d6 4.fxe5

KGD, classical, Heath variation
3.Nf3 d6 4.b4

KGD, 2...Nf6
2... Nf6
C31
KGD, Falkbeer counter-gambit
1.e4 e5 2.f4 d5

KGD, Falkbeer, Tartakower variation
3.Nf3

KGD, Falkbeer, Milner-Barry variation
3.Nc3

KGD, Falkbeer counter-gambit (3.exd5)
3.exd5

KGD, Nimzovich counter-gambit
3... c6

KGD, Falkbeer, 3...e4
3... e4

KGD, Falkbeer, Rubinstein variation
4.Nc3 Nf6 5.De2

KGD, Falkbeer, Nimzovich variation
4.Bb5+

KGD, Falkbeer, 4.d3
4.d3

KGD, Falkbeer, Morphy gambit
4... Nf6 5.Nc3 Bb4 6.Bd2 e3
C32
KGD, Falkbeer, 5.de
1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4

KGD, Falkbeer, Alapin variation
5... Nxe4 6.Nf3 Bc5 7.Qe2 Bf2+ 8.Kd1 Qxd5+ 9.Nfd2

KGD, Falkbeer, main line, 7...Bf5
5... Nxe4 6.Nf3 Bc5 7.Qe2 Bf5

KGD, Falkbeer, Tarrasch variation
8.g4 Kf8

KGD, Falkbeer, Charousek gambit
5... Nxe4 6.Qe2

KGD, Falkbeer, Charousek variation
6... Qxd5 7.Nd2 f5 8.g4

KGD, Falkbeer, Keres variation
1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Nd2

KGD, Falkbeer, Reti variation
1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Qe2
C33
King's gambit accepted
1.e4 e5 2.f4 exf4

KGA, Tumbleweed gambit
3.Kf2

KGA, Orsini gambit
3.b3

KGA, Pawn's gambit (Stamma gambit)
3.h4

KGA, Schurig gambit
3.Bd3

KGA, Carrera (Basman) gambit
3.Qe2

KGA, Villemson (Steinitz) gambit
3.d4

KGA, Keres (Mason-Steinitz) gambit
3.Nc3

KGA, Breyer gambit
3.Qf3

KGA, Lesser bishop's (Petroff-Jaenisch-Tartakower) gambit
3.Be2

KGA, bishop's gambit
3.Bc4

KGA, bishop's gambit, Chigorin's attack
3... Qh4+ 4.Kf1 d5 5.Bxd5 g5 6.g3

KGA, bishop's gambit, Greco variation
4.Kf1 Bc5

KGA, bishop's gambit, classical defence
4.Kf1 g5

KGA, bishop's gambit, Grimm attack
5.Nc3 Bg7 6.d4 d6 7.e5

KGA, bishop's gambit, classical defence (6... Ne7)
5.Nc3 Bg7 6.d4 Ne7

KGA, bishop's gambit, McDonnell attack
7.g3

KGA, bishop's gambit, McDonnell attack (6.g3)
5.Nc3 Bg7 6.g3

KGA, bishop's gambit, Fraser variation
6... fxg3 7.Qf3

KGA, bishop's gambit, classical defence, Cozio attack
5.Qf3

KGA, bishop's gambit, Boden defence
3... Qh4+ 4.Kf1 Nc6

KGA, bishop's gambit, Bryan counter-gambit
3... Qh4+ 4.Kf1 b5

KGA, bishop's gambit, Bryan counter-gambit (3...b5)
3... b5

KGA, bishop's gambit, Steinitz defence
3... Ne7

KGA, bishop's gambit, Maurian defence
3... Nc6

KGA, bishop's gambit, Ruy Lopez defence
3... c6

KGA, bishop's gambit, Lopez-Gianutio counter-gambit
3... f5

KGA, Lopez-Gianutio counter-gambit, Hein variation
4.Qe2 Qh4+ 5.Kd1 fxe4 6.Nc3 Kd8

KGA, bishop's gambit, Bledow variation
3... d5

KGA, bishop's gambit, Gifford variation
4.Bxd5 Qh4+ 5.Kf1 g5 6.g3

KGA, bishop's gambit, Boren-Svenonius variation
4.Bxd5 Qh4+ 5.Kf1 Bd6

KGA, bishop's gambit, Anderssen variation
4.Bxd5 c6

KGA, bishop's gambit, Morphy variation
4.Bxd5 Nf6

KGA, bishop's gambit, Cozio (Morphy) defence
3... Nf6

KGA, bishop's gambit, Bogolyubov variation
4.Nc3

KGA, bishop's gambit, Paulsen attack
4... Bb4 5.e5

KGA, bishop's gambit, Jaenisch variation
4... c6
C34
King's knight's gambit
1.e4 e5 2.f4 exf4 3.Nf3

KGA, Bonsch-Osmolovsky variation
3... Ne7

KGA, Gianutio counter-gambit
3... f5

KGA, Fischer defence
3... d6

KGA, Becker defence
3... h6

KGA, Schallop defence
3... Nf6
C35
KGA, Cunningham defence
1.e4 e5 2.f4 exf4 3.Nf3 Be7

KGA, Cunningham, Bertin gambit
4.Bc4 Bh4+ 5.g3

KGA, Cunningham, three pawns gambit
5... fxg3 6.O-O gxh2+ 7.Kh1

KGA, Cunningham, Euwe defence
4.Bc4 Nf6
C36
KGA, Abbazia defence (classical defence, modern defence[!])
1.e4 e5 2.f4 exf4 3.Nf3 d5

KGA, Abbazia defence, modern variation
4.exd5 Nf6

KGA, Abbazia defence, Botvinnik variation
 5.Bb5+ c6 6.dxc6 bxc6 7.Bc4 Nd5
C37
KGA, Quaade gambit
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Nc3

KGA, Rosentreter gambit
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4

KGA, Soerensen gambit
4... g4 5.Ne5

KGA, King's knight's gambit
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4

KGA, Blachly gambit
4... Nc6

KGA, Lolli gambit (wild Muzio gambit)
4... g4 5.Bxf7+

KGA, Lolli gambit, Young variation
5... Rxf7 6.O-O gxf3 7.Qxf3 Qf6 8.d4 Qxd4+ 9.Be3 Qf6 10.Nc3

KGA, Ghulam Kassim gambit
4... g4 5.d4

KGA, MacDonnell gambit
4... g4 5.Nc3

KGA, Salvio gambit
4... g4 5.Ne5

KGA, Silberschmidt gambit
5... Qh4+ 6.Kf1 Nh6 7.d4 f3

KGA, Salvio gambit, Anderssen counter-attack
5... Qh4+ 6.Kf1 Nh6 7.d4 d6

KGA, Cochrane gambit
5... Qh4+ 6.Kf1 f3

KGA, Herzfeld gambit
5... Qh4+ 6.Kf1 Nc6

KGA, Muzio gambit
4... g4 5.O-O

KGA, Muzio gambit, Paulsen variation
5... gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.d3 Bh6 9.Nc3 Ne7 10.Bd2 Nbc6 11.Rae1

KGA, double Muzio gambit
5... gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.Bxf7+

KGA, Muzio gambit, From defence
5... gxf3 6.Qxf3 Qe7

KGA, Muzio gambit, Holloway defence
5... gxf3 6.Qxf3 Nc6

KGA, Muzio gambit, Kling and Horwitz counter-attack
5... Qe7

KGA, Muzio gambit, Brentano defence
5... d5
C38
King's knight's gambit
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7

KGA, Hanstein gambit
5.O-O

KGA, Philidor gambit
5.h4

KGA, Greco gambit
5... h6 6.d4 d6 7.Nc3 c6 8.hxg5 hxg5 9.Rxh8 Bxh8 10.Ne5

KGA, Philidor gambit, Schultz variation
5... h6 6.d4 d6 7.Qd3
C39
King's knight's gambit
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4

KGA, Allgaier gambit
4... g4 5.Ng5

KGA, Allgaier, Horny defence
5... h6 6.Nxf7 Kxf7 7.Qxg4 Nf6 8.Qxf4 Bd6

KGA, Allgaier, Thorold variation
5... h6 6.Nxf7 Kxf7 7.d4

KGA, Allgaier, Cook variation
7... d5 8.Bxf4 dxe4 9.Bc4+ Kg7 10.Be5+

KGA, Allgaier, Blackburne gambit
5... h6 6.Nxf7 Kxf7 7.Nc3

KGA, Allgaier, Walker attack
5... h6 6.Nxf7 Kxf7 7.Bc4+

KGA, Allgaier, Urusov attack
7... d5 8.exd5 Bg7 9.d4

KGA, Allgaier, Schlechter defence
5... Nf6

KGA, Kieseritsky, Paulsen defence
4... g4 5.Ne5 Bg7

KGA, Kieseritsky, long whip (Stockwhip) defence
4... g4 5.Ne5 h5

KGA, Kieseritsky, long whip defence, Jaenisch
6.Bc4 Rh7 7.d4 Bh6 8.Nc3

KGA, Kieseritsky, Brentano (Campbell) defence
4... g4 5.Ne5 d5

KGA, Kieseritsky, Brentano defence, Kaplanek
6.d4 Nf6 7.exd5 Qxd5 8.Nc3 Bb4 9.Kf2

KGA, Kieseritsky, Brentano defence
6.d4 Nf6 7.Bxf4

KGA, Kieseritsky, Brentano defence, Caro
6.d4 Nf6 7.Bxf4 Nxe4 8.Nd2

KGA, Kieseritsky, Salvio (Rosenthal) defence
4.... g4 5.Ne5 Qe7

KGA, Kieseritsky, Salvio defence, Cozio
6.d4 f5 7.Bc4

KGA, Kieseritsky, Polerio defence
4... g4 5.Ne5 Be7

KGA, Kieseritsky, Neumann defence
4... g4 5.Ne5 Nc6

KGA, Kieseritsky, Kolisch defence
4... g4 5.Ne5 d6

KGA, Kieseritsky, Berlin defence
4... g4 5.Ne5 Nf6

KGA, Kieseritsky, Berlin defence, Riviere
6.Nxg4 d5

KGA, Kieseritsky, Berlin defence, 6.Bc4
6.Bc4

KGA, Kieseritsky, Rice gambit
 6... d5 7.exd5 Bd6 8.O-O
C40
King's knight opening
1.e4 e5 2.Nf3

Gunderam defence
2... Qe7

Greco defence
2... Qf6

Damiano's defence
2... f6

QP counter-gambit (elephant gambit)
2... d5

QP counter-gambit, Maroczy gambit
3.exd5 Bd6

Latvian counter-gambit
2... f5

Latvian, Nimzovich variation
3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Ne3

Latvian, Fraser defence
3.Nxe5 Nc6

Latvian gambit, 3.Bc4
3.Bc4

Latvian, Behting variation
3... fxe4 4.Nxe5 Qg5 5.Nf7 Qxg2 6.Rf1 d5 7.Nxh8 Nf6

Latvian, Polerio variation
3... fxe4 4.Nxe5 d5

Latvian, corkscrew counter-gambit
3... fxe4 4.Nxe5 Nf6
C41
Philidor's defence
1.e4 e5 2.Nf3 d6

Philidor, Steinitz variation
3.Bc4 Be7 4.c3

Philidor, Lopez counter-gambit
3.Bc4 f5

Philidor, Lopez counter-gambit, Jaenisch variation
4.d4 exd4 5.Ng5 Nh6 6.Nxh7

Philidor's defence (3.d4)
3.d4

Philidor, Philidor counter-gambit
3... f5

Philidor, Philidor counter-gambit, del Rio attack
4.dxe5 fxe4 5.Ng5 d5 6.e6

Philidor, Philidor counter-gambit, Berger variation
6... Bc5 7.Nc3

Philidor, Philidor counter-gambit, Zukertort variation
 4.Nc3

Philidor, exchange variation
3... exd4

Philidor, Boden variation
4.Qxd4 Bd7

Philidor, exchange variation (4.Nxd4)
4.Nxd4

Philidor, Paulsen attack
4... d5 5.exd5

Philidor, exchange variation (4...Nf6)
4... Nf6

Philidor, Berger variation
5.Nc3 Be7 6.Be2 O-O 7.O-O c5 8.Nf3 Nc6 9.Bg5 Be6 10.Re1

Philidor, Larsen variation
4... g6

Philidor, Nimzovich (Jaenisch) variation
3... Nf6

Philidor, Improved Hanham variation
4.Nc3 Nbd7

Philidor, Nimzovich, Sozin variation
5.Bc4 Be7 6.O-O O-O 7.Qe2 c6 8.a4 exd4

Philidor, Nimzovich, Larobok variation
5.Bc4 Be7 6.Ng5 O-O 7.Bxf7+

Philidor, Nimzovich variation
4.dxe5

Philidor, Nimzovich, Sokolsky variation
4... Nxe4 5.Nbd2

Philidor, Nimzovich, Rellstab variation
4... Nxe4 5.Dd5

Philidor, Nimzovich, Locock variation
4.Ng5

Philidor, Nimzovich, Klein variation
4.Bc4

Philidor, Hanham variation
3... Nd7

Philidor, Hanham, Krause variation
4.Bc4 c6 5.O-O

Philidor, Hanham, Steiner variation
5... Be7 6.dxe5

Philidor, Hanham, Kmoch variation
4.Bc4 c6 5.Ng5

Philidor, Hanham, Berger variation
5... Nh6 6.f4 Be7 7.O-O O-O 8.c3 d5

Philidor, Hanham, Schlechter variation
4.Bc4 c6 5.Nc3

Philidor, Hanham, Delmar variation
4.Bc4 c6 5.c3
C42
Petrov's defence
1.e4 e5 2.Nf3 Nf6

Petrov, French attack
3.Nxe5 d6 4.Nf3 Nxe4 5.d3

Petrov, Kaufmann attack
3.Nxe5 d6 4.Nf3 Nxe4 5.c4

Petrov, Nimzovich attack
3.Nxe5 d6 4.Nf3 Nxe4 5.Nc3

Petrov, Cozio (Lasker) attack
3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2

Petrov, classical attack
3.Nxe5 d6 4.Nf3 Nxe4 5.d4

Petrov, classical attack, Chigorin variation
5... d5 6.Bd3 Be7 7.O-O Nc6 8.Re1

Petrov, classical attack, Berger variation
8... Bg4 9.c3 f5 10.Nbd2

Petrov, classical attack, Krause variation
8... Bg4 9.c3 f5 10.c4

Petrov, classical attack, Maroczy variation
10... Bh4

Petrov, classical attack, Jaenisch variation
5... d5 6.Bd3 Be7 7.O-O Nc6 8.c4

Petrov, classical attack, Mason variation
5... d5 6.Bd3 Be7 7.O-O O-O

Petrov, classical attack, Marshall variation
5... d5 6.Bd3 Bd6

Petrov, classical attack, Tarrasch variation
7.O-O O-O 8.c4 Bg4

Petrov, classical attack, Marshall trap
9.cxd5 f5 10.Re1 Bxh2+

Petrov, classical attack, close variation
5... Nf6

Petrov, Cochrane gambit
3.Nxe5 d6 4.Nxf7

Petrov, Paulsen attack
3.Nxe5 d6 4.Nc4

Petrov, Damiano variation
3.Nxe5 Nxe4

Petrov three knights game
3.Nc3

Petrov, Italian variation
3.Bc4
C43
Petrov, modern (Steinitz) attack
1.e4 e5 2.Nf3 Nf6 3.d4

Petrov, modern attack, main line
3... exd4 4.e5 Ne4 5.Qxd4

Petrov, modern attack, Steinitz variation
3... exd4 4.e5 Ne4 5.Qe2

Petrov, modern attack, Bardeleben variation
5... Nc5 6.Nxd4 Nc6

Petrov, Urusov gambit
3... exd4 4.Bc4

Petrov, modern attack, Symmetrical variation
3... Nxe4

Petrov, modern attack, Trifunovic variation
4.Bd3 d5 5.Nxe5 Bd6 6.O-O O-O 7.c4 Bxe5
C44
King's pawn game
1.e4 e5 2.Nf3 Nc6

Irish (Chicago) gambit
3.Nxe5 Nxe5 4.d4

Konstantinopolsky opening
3.g3

Dresden opening
3.c4

Inverted Hungarian
3.Be2

Inverted Hanham
3... Nf6 4.d3 d5 5.Nbd2

Tayler opening
3... Nf6 4.d4

Ponziani opening
3.c3

Ponziani, Caro variation
3... d5 4.Qa4 Bd7

Ponziani, Leonhardt variation
3... d5 4.Qa4 Nf6

Ponziani, Steinitz variation
3... d5 4.Qa4 f6

Ponziani, Jaenisch counter-attack
3... Nf6

Ponziani, Fraser defence
4.d4 Nxe4 5.d5 Bc5

Ponziani, Reti variation
3... Nge7

Ponziani, Romanishin variation
3... Be7

Ponziani counter-gambit
3... f5

Ponziani counter-gambit, Schmidt attack
4.d4 d6 5.d5

Ponziani counter-gambit, Cordel variation
5... fxe4 6.Ng5 Nb8 7.Nxe4 Nf6 8.Bd3 Be7

Scotch opening
3.d4

Scotch, Lolli variation
3... Nxd4

Scotch, Cochrane variation
4.Nxe5 Ne6 5.Bc4 c6 6.O-O Nf6 7.Nxf7

Scotch, Relfsson gambit ('MacLopez')
3... exd4 4.Bb5

Scotch, Goering gambit
3... exd4 4.c3

Scotch, Sea-cadet mate
4... dxc3 5.Nxc3 d6 6.Bc4 Bg4 7.O-O Ne5 8.Nxe5 Bxd1 9.Bxf7+ Ke7 10.Nd5+

Scotch, Goering gambit (5...Bb4)
4... dxc3 5.Nxc3 Bb4

Scotch, Goering gambit, Bardeleben variation
6.Bc4 Nf6

Scotch gambit
3... exd4 4.Bc4

Scotch gambit, Anderssen (Paulsen, Suhle) counter-attack
4... Bc5 5.O-O d6 6.c3 Bg4

Scotch gambit (5.Ng5)
4... Bc5 5.Ng5

Scotch gambit, Cochrane-Shumov defence
5... Nh6 6.Nxf7 Nxf7 7.Bxf7+ Kxf7 8.Qh5+ g6 9.Qxc5 d5

Scotch gambit, Vitzhum attack
5... Nh6 6.Qh5

Scotch gambit (4... Bb4+)
4... Bb4+

Scotch gambit, Hanneken variation
5.c3 dxc3 6.O-O cxb2 7.Bxb2 Nf6 8.Ng5 O-O 9.e5 Nxe5

Scotch gambit (6.bxc3)
5.c3 dxc3 6.bxc3

Scotch gambit, Cochrane variation
5.c3 dxc3 6.bxc3 Ba5 7.e5

Scotch gambit, Benima defence
4... Be7

Scotch gambit, Dubois-Reti defence
4... Nf6
C45
Scotch game
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4

Scotch, Ghulam Kassim variation
4... Nxd4 5.Qxd4 d6 6.Bd3

Scotch, Pulling counter-attack
4... Qh4

Scotch, Horwitz attack
5.Nb5

Scotch, Berger variation
5... Bb4+ 6.Nd2 Qxe4+ 7.Be2 Qxg2 8.Bf3 Qh3 9.Nxc7+ Kd8 10.Nxa8 Nf6 11.a3

Scotch game (6.Bd2)
5... Bb4+ 6.Bd2

Scotch, Rosenthal variation
6... Qxe4+ 7.Be2 Kd8 8.O-O Bxd2 9.Nxd2 Qg6

Scotch, Fraser attack
5.Nf3

Scotch, Steinitz variation
5.Nc3

Scotch, Schmidt variation
4... Nf6

Scotch, Mieses variation
5.Nxc6 bxc6 6.e5

Scotch, Tartakower variation
5.Nxc6 bxc6 6.Nd2

Scotch game (4...Bc5)
4... Bc5

Scotch, Blackburne attack
5.Be3 Qf6 6.c3 Nge7 7.Qd2

Scotch, Gottschall variation
7... d5 8.Nb5 Bxe3 9.Qxe3 O-O 10.Nxc7 Rb8 11.Nxd5 Nxd5 12.exd5 Nb4

Scotch, Paulsen attack
5.Be3 Qf6 6.c3 Nge7 7.Bb5

Scotch, Paulsen, Gunsberg defence
7... Nd8

Scotch, Meitner variation
5.Be3 Qf6 6.c3 Nge7 7.Nc2

Scotch, Blumenfeld attack
5.Be3 Qf6 6.Nb5

Scotch, Potter variation
5.Nb3

Scotch, Romanishin variation
5... Bb4+
C46
Three knights game
1.e4 e5 2.Nf3 Nc6 3.Nc3

Three knights, Schlechter variation
3... Bb4 4.Nd5 Nf6

Three knights, Winawer defence (Gothic defence)
3... f5

Three knights, Steinitz variation
3... g6

Three knights, Steinitz, Rosenthal variation
4.d4 exd4 5.Nd5

Four knights game
3... Nf6

Four knights, Schultze-Mueller gambit
4.Nxe5

Four knights, Italian variation
4.Bc4

Four knights, Gunsberg variation
4.a3
C47
Four knights, Scotch variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4

Four knights, Scotch, Krause variation
4... Bb4 5.Nxe5

Four knights, Scotch, 4...exd4
4... exd4

Four knights, Belgrade gambit
5.Nd5
C48
Four knights, Spanish variation
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5

Four knights, Ranken variation
4... a6 5.Bxc6

Four knights, Spielmann variation
5... dxc6 6.Nxe5 Nxe4 7.Nxe4 Qd4 8.O-O Qxe5 9.Te1 Be6 10.d4 Qd5

Four knights, Spanish, classical defence
4... Ac5

Four knights, Bardeleben variation
5.O-O O-O 6.Nxe5 Nxe5 7.d4 Bd6 8.f4 Nc6 9.e5 Bb4

Four knights, Marshall variation
5.O-O O-O 6.Nxe5 Nd4

Four knights, Rubinstein counter-gambit
4... Nd4

Four knights, Rubinstein counter-gambit, Bogolyubov
5.Nxe5 Qe7 6.f4

Four knights, Rubinstein counter-gambit, 5.Be2
5.Be2

Four knights, Rubinstein counter-gambit Maroczy
5... Nxf3+ 6.Bxf3 Bc5 7.O-O O-O 8.d3 d6 9.Na4 Bb6

Four knights, Rubinstein counter-gambit, exchange
5.Nxd4

Four knights, Rubinstein counter-gambit, Henneberger
5.O-O
C49
Four knights, double Ruy Lopez
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4

Four knights, Gunsberg counter-attack
5.O-O O-O 6.Nd5 Nxd5 7.exd5 e4

Four knights, double Ruy Lopez (6.d3)
5.O-O O-O 6.d3

Four knights, Alatortsev variation
6... Qe7 7.Ne2 d5

Four knights
6... Bxc3

Four knights, Janowski variation
7.bxc3 d6 8.Re1

Four knights, Svenonius variation
7.bxc3 d5

Four knights, symmetrical variation
6... d6

Four knights, symmetrical, Metger unpin
7.Bg5 Bxc3 8.bxc3 Qe7

Four knights, symmetrical, Capablanca variation
9.Re1 Nd8 10.d4 Bg4

Four knights, symmetrical, Pillsbury variation
7.Bg5 Ne7

Four knights, symmetrical, Blake variation
8.Nh4 c6 9.Bc4 d5 10.Bb3 Qd6

Four knights, symmetrical, Tarrasch variation
7.Bg5 Be6

Four knights, symmetrical, Maroczy system
7.Ne2

Four knights, Nimzovich (Paulsen) variation
5.O-O O-O 6.Bxc6
C50
King's pawn game
1.e4 e5 2.Nf3 Nc6 3.Bc4

Blackburne shilling gambit
3... Nd4 4.Nxe5 Qg5 5.Nxf7 Qxg2 6.Rf1 Qxe4+ 7.Be2 Nf3+

Rousseau gambit
3... f5

Hungarian defence
3... Be7

Hungarian defence, Tartakower variation
4.d4 exd4 5.c3 Nf6 6.e5 Ne4

Giuoco Piano
3... Bc5

Giuoco Piano, four knights variation
4.Nc3 Nf6

Giuoco Piano, Jerome gambit
4.Bxf7+

Giuoco Pianissimo
4.d3

Giuoco Pianissimo, Dubois variation
4... f5 5.Ng5 f4

Giuoco Pianissimo (4...Nf6)
4... Nf6

Giuoco Pianissimo, Italian four knights variation
5.Nc3

Giuoco Pianissimo, Canal variation
5... d6 6.Bg5
C51
Evans gambit declined 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4

Evans gambit declined, Lange variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6

Evans gambit declined, Pavlov variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6 7.d4 d6 8.Bxh6 dxe5 9.Bxg7 Rg8 10.Bxf7+ Kxf7 11.Bxe5 Qg5 12.Nd2

Evans gambit declined, Hirschbach variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5

Evans gambit declined, Vasquez variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5 7.Bxf7+ Ke7 8.Qh5

Evans gambit declined, Hicken variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5 7.Qf3 Qxe5 8.Qxf7+ Kd8 9.Bb2

Evans gambit declined, 5.a4
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.a4

Evans gambit declined, Showalter variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.a4 a6 6.Nc3

Evans gambit declined, Cordel variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.Bb2

Evans counter-gambit
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 d5

Evans gambit
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4

Evans gambit normal variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6

Evans gambit Ulvestad variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2

Evans gambit Paulsen variation
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2 Ne7

Evans gambit Morphy attack
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.Nc3

Evans gambit Goering attack
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.Nc3 Na5 10.Bg5
C60
Ruy Lopez (Spanish opening) 1.e4 e5 2.Nf3 Nc6 3.Bb5

Ruy Lopez Nuernberg variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 f6

Ruy Lopez Pollock defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 Na5

Ruy Lopez Lucena defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 Be7

Ruy Lopez Vinogradov variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Qe7

Ruy Lopez Brentano defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 g5

Ruy Lopez fianchetto (Smyslov/Barnes) defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 g6

Ruy Lopez Cozio defence
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7

Ruy Lopez Cozio defence, Paulsen variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7 4.Nc3 g6
C61
Ruy Lopez Bird''s defence 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4

Ruy Lopez Bird''s defence, Paulsen variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 exd4 5.O-O Ne7
C62
Ruy Lopez old Steinitz defence 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6

Ruy Lopez old Steinitz defence, Nimzovich attack
1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 5.Nc3 Nf6 6.Bxc6

Ruy Lopez old Steinitz defence, semi-Duras variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 5.c4
C63
Ruy Lopez Schliemann defence 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5

Ruy Lopez Schliemann defence, Berger variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3
C64
Ruy Lopez classical (Cordel) defence 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5

Ruy Lopez classical defence, Zaitsev variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.O-O Nd4 5.b4

Ruy Lopez classical defence, 4.c3
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3

Ruy Lopez classical defence, Benelux variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Nf6 5.O-O O-O 6.d4 Bb6

Ruy Lopez classical defence, Charousek variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Bb6

Ruy Lopez classical defence, Boden variation
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Qe7

Ruy Lopez Cordel gambit
1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 f5
C65
Ruy Lopez Berlin defence 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6

Ruy Lopez Berlin defence, Nyholm attack
4.d4 exd4 5.O-O

Ruy Lopez Berlin defence, Mortimer variation
4.d3 Ne7

Ruy Lopez Berlin defence, Mortimer trap
5.Nxe5 c6

Ruy Lopez Berlin defence, Anderssen variation
4.d3 d6 5.Bxc6+

Ruy Lopez Berlin defence, Duras variation
4.d3 d6 5.c4

Ruy Lopez Berlin defence, Kaufmann variation
4.d3 Bc5 5.Be3

Ruy Lopez Berlin defence, 4.O-O
4.O-O

Ruy Lopez Berlin defence, Beverwijk variation
4... Bc5
C66
Ruy Lopez Berlin defence, 4.O-O, d6 4... d6