C44

Konstantinopolsky Opening

1.e4 e5 2.Nf3 Nc6 3.g3

A00

Koola-Koola

1.h4 a5

C74

Kopaiev Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5 6.exf5 Bxf5 7.O-O

B50

Kopec System, Sicilian

1.e4 c5 2.Nf3 d6 3.Bd3

E97

Korchnoi Attack, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Bd2

B23

Korchnoi Defense, Sicilian

1.e4 c5 2.Nc3 e6 3.g3 d5

D20

Korchnoi Gambit, QGA

1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.Kf1

A28

Korchnoi Line, English

1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.a3

E21

Korchnoi Variation, Nimzo-Indian

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5

A80

Korchnoi's Variation, Dutch

1.d4 f5 2.h3

A16

Korchnoi's Variation, English

1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5

A52

Kornl Richter Gambit, Budapest

1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 Nc6 5.Nf3 Bb4+ 6.Nc3 Bxc3+

C63

Kostic Defense, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 Be7

C63

Kostic Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nf6 5.exf5 Bc5

C37

Kotov Gambit

1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4 gxf3 6.Bxf4

B50

Kotov Gambit, Sicilian

1.e4 c5 2.Nf3 d6 3.g3 b5

A40

Kotov Variation, Modern

1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nc6

A40

Kotov-Robatsch Defense

1.d4 g6 2.c4 Bg7

E98

Kozul Gambit, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Be3 f5

E70

Kramer Variation, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.Nge2

E17

Kramnik Variation, QID

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Re1

B40

Kramnik Variation, Sicilian

1.e4 c5 2.Nf3 e6 3.c4

D85

Kramnik's Line, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5 8.h3

A21

Kramnik-Shirov Variation, English

1.c4 e5 2.Nc3 Bb4

D17

Krause Attack, Slav

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5

C47

Krause Gambit, Four Knights

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5

A84

Krause Variation, Dutch

1.d4 f5 2.c4 Nf6 3.Nc3 d6 4.Nf3 Nc6

C41

Krause Variation, Philidor

1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.O-O

A45

Kraus-Muhlherr Counter Gambit

1.d4 Nf6 2.f3 d5 3.e4 e5 4.dxe5 Nxe4

C23

Kreijcik Gambit, Bishop

1.e4 e5 2.Bc4 Nf6 3.f3 Bc5 4.Ne2 Nc6 5.b4

C20

Krejcik Gambit

1.e4 e5 2.f3 Nf6 3.Bc4 Bc5 4.Ne2 Nc6 5.b4

B02

Krejcik Variation, Alekhine

1.e4 Nf6 2.Bc4 

C15

Kunin Double Gambit, French

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 dxe4 5.Qg4 Qxd4

C22

Kupreichik Variation, Center

1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6 5.Nc3 Bb4 6.Bd2 O-O 7.O-O-O Re8 8.Bc4

B56

Kupreichik Variation, Sicilian

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bd7

A13

Kurajica Defense, English

1.c4 e6 2.Nf3 d5 3.g3 c6

B09

Kurajica Variation, Pirc

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Be3

C57

Kurkin Gambit, Two Knights

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5 6.Bf1 h6 7.Nxf7

B40

Kveinis Variation, Sicilian

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Qb6

C40

Labourdonnais Gambit

1.e4 e5 2.Nf3 Qf6 3.Bc4 Qg6 4.O-O

C53

Labourdonnais Variation, Italian

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 d6 5.d4 exd4 6.cxd4 Bb6

C23

Labourdonnais-Denker Gambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.c3

D00

Lamb Defense, BDG

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Nc6

C21

Lanc-Arnold Gambit, Center

1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3

B12

Landau Gambit, Caro-Kann

1.e4 c6 2.d4 d5 3.Bd3 Nf6 4.e5 Nfd7 6.e6

D12

Landau Variation, Slav

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Qb3 Qc8 7.Bd2 e6 8.Na3

D00

Lange Gambit; Alfred Lange Gambit; Simple Variation

1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4

C51

Lange Variation, Evans Gambit

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6

D00

Langeheinecke Variation, BDG

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e3

A02

Langheld Gambit, Bird

1.f4 e5 2.fxe5 d6 3.exd6 Nf6

C41

Larobok Variation, Philidor

1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7

A00

Laroche Gambit, Dunst

1.Nc3 b5

E62

Larsen Defense, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Bf5

B20

Larsen Defense, Smith-Morra Accepted, Sicilian

1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6 7.O-O Qc7 8.Qe2 Bd6

B04

Larsen Variation, Alekhine

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 dxe5

D86

Larsen Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 Qd7

D86

Larsen Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 Qd7 9.O-O b6

E90

Larsen Variation, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be3

C41

Larsen Variation, Philidor

1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 g6

D47

Larsen Variation, Semi-Slav

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7 9.e4 b4 10.Na4 c5

D25

Larsen; Janowski; Modern Variation, QGA

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4

A01

Larsen; Queen's Fianchetto; Nimzo-Larsen Attack A01

1.b3

B21

Larsen-Santasiere (McDonnell Attack) Variation, Sicilian; B21

1.e4 c5 2.f4

C20

Lasa Gambit

1.e4 e5 2.c3 f5

C52

Lasker Defense, Evans

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.O-O Bb6

D53

Lasker Defense, QGD

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Ne4

A02

Lasker Gambit, Bird

1.f4 e5 2.fxe5 f6

A00

Lasker Simul Special

1.g3 h5

D08

Lasker Trap, QGD

1.d4 d5 2.c4 e5 3.dxe5 d4 4.e3 Bb4+ 5.Bd2 dxe3

B02

Lasker Variation, Alekhine

1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5

A02

Lasker Variation, Bird

1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 g5

B01

Lasker Variation, Center Counter

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3

A83

Lasker Variation, Dutch

1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 g6 5.f3

C12

Lasker Variation, French

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3

C42

Lasker Variation, Petroff

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2

D56

Lasker Variation, QGD

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7

B33

Lasker-Pelikan Variation, Sicilian

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5

C40

Latvian Gambit Accepted

1.e4 e5 2.Nf3 f5 3.exf5

C40

Latvian; Greco Counter-Gambit

1.e4 e5 2.Nf3 f5

D06

Lazard Gambit, Chigorin Defense

1.d4 d5 2.c4 Nc6 3.Nf3 e5

A45

Lazard Gambit; Maddigan Gambit

1.d4 Nf6 2.Nd2 e5

B53

Lazy Knight Variation, Sicilian

1.e4 c5 2.Nf3 d6 3.d4 Nd7

D70

Leko Gambit

1.d4 Nf6 2.c4 g6 3.f3 e5

A05

Lemberg Gambit, Zukertort

1.Nf3 Nf6 2.e4

D00

Lemberger Counter-Gambit, BDG

1.d4 d5 2.e4 dxe4 3.Nc3 e5

B00

Lemming Defense

1.e4 Na6

A86

Leningrad Variation, Dutch

1.d4 f5 2.c4 Nf6 3.g3 g6

C04

Leningrad Variation, French

1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6 5.e5 Nfd7 5.f4 c5 6.c3 Nc6 7.Ndf3 cxd4 8.cxd4

E30

Leningrad Variation, Nimzo-Indian; E30

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5

C33

Leonardo (Stamma) Gambit, KGA

1.e4 e5 2.f4 exf4 3.h4

B01

Leonhardt (Rosen) Gambit, Center Counter

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.b4

C47

Leonhardt Defense, Four Knights

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5 Qe7

C52

Leonhardt Variation, Evans

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 b5

C40

Leonhardt Variation, Latvian

1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4 fxe4 5.Nc3

C44

Leonhardt Variation, Ponziani

1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 Nf6

C90

Leonhardt Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.h3 Nc6 12.d5 Nd8 13.Nbd2 g5

B88

Leonhardt Variation, Sicilian; B88

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6

C33

Lesser Bishop; Tartakower

1.e4 e5 2.f4 exf4 3.Be2

E62

Lesser Simagin (Spassky) Variation, KID

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O Bf5

A04

Lessing Defense; Black Mustang Defense

1.Nf3 Nc6

D97

Levenfish Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 b6

B71

Levenfish Variation, Sicilian; B71

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.f4

C40

Levenstein; Queen's Defense; Brazilian; Gunderam

1.e4 e5 2.Nf3 Qe7

C23

Lewis Countergambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.c3 d5 4.Bxd5 Nf6

C23

Lewis Counter-Gambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.c3 d5

C53

Lewis Defense, Italian; Closed Variation

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7

C23

Lewis Gambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.d4

C67

L'Hermet Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Nd6

C42

Lichtenhein Defense, Petroff

1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 d5

A00

Liebig Gambit, Dunst

1.Nc3 e5 2.e3 d5 3.Qh5 Nf6

D44

Lilienthal Variation, Semi-Slav

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7

D20

Linares Variation, QGA

1.d4 d5 2.c4 dxc4 3.e4 c5 4.d5 Nf6 5.Nc3 b5

A45

Linder Counter Gambit

1.d4 Nf6 2.f3 e6 3.e4 Nxe4

B00

Linksspringer Variation, Nimzovich Defense

1.e4 Nc6 2.d4 e5 3.d5

C41

Lion Variation, Philidor

1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Nc3 Nf6

B07

Lion's Jaw, Pirc

1.e4 d6 2.d4 Nf6 3.f3

B90

Lipnitzky Variation, Sicilian

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4

A42

Lisbon Gambit

1.d4 d6 2.c4 e5 3.dxe5 Nc6

A80

Lisbon Gambit, Dutch; Krejcik Gambit

1.d4 f5 2.g4

A06

Lisitsin Gambit Deferred, Zukertort

1.Nf3 f5 2.d3 Nf6 3.e4

A04

Lisitsin Gambit; Polish Gambit

1.Nf3 f5 2.e4 

A40

Lithuanian Variation, Mikenas

1.d4 Nc6 2.c4 e5 3.d5 Nce7

A40

Lizard Defense; Pirc-Diemer Gambit

1.d4 g6 2.h4 Nf6 3.h5

B28

Ljubojevic Line, Sicilian

1.e4 c5 2.Nf3 a6 3.c3 b5

B09

Ljubojevic Variation, Pirc

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Bc4

C40

Lobster Gambit, Latvian

1.e4 e5 2.Nf3 f5 3.g4

C41

Locock Variation, Philidor

1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Ng5 h6 5.Nxf7

D33

Lodz; Schlecter; Rubinstein Var, QGD; D33

1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3

A10

Loehn Gambit, English

1.c4 d5 2.cxd5 e6

C57

Lolli Attack, 2 Knights

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4

C44

Lolli Attack, Scotch

1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4

C56

Loman Defense, 2 Knights

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 g6

A00

London Defense, Grob

1.g4 e5 2.h3 Nc6

C44

London Defense, Scotch

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+

A46

London System

1.d4 Nf6 2.Nf3 e6 3.Bf4

A48

London System, Torre Attack

1.d4 Nf6 2.Nf3 g6 3.Bf4

D02

London System; Queen's Bishop Opening

1.d4 d5 2.Nf3 Nf6 3.Bf4

A09

London V; New York V, Reti

1.Nf3 d5 2.c4 c6 3.b3 Nf6 4.Bb2 Bf5

A48

London Variation

1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.Nbd2

C39

Long Whip Variation, KGA

1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 h5

C41

Lopez Counter-Gambit, Philidor

1.e4 e5 2.Nf3 d6 3.Bc4 f5

C33

Lopez Defense, KGA

1.e4 e5 2.f4 exf4 3.Bc4 c6

C84

Lopez Four Knights, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Nc3

C23

Lopez Gambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.Qe2 Nf6 4.f4

C23

Lopez Variation, Bishop

1.e4 e5 2.Bc4 Bc5 3.Qe2

B58

Louma Variation, Sicilian

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5 7.Nxc6

C02

Lputian Variation, French

1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3 Nh6

C50

Lucchini Gambit; Italian

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 f5

C60

Lucena Defense, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 Be7

A40

Lundin Defense

1.d4 Nc6

D80

Lundin Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5 Ne4 5.Nxe4 dxc3 6.Qd2 c5

A56

Lundin; Bronstein Counter-Gambit

1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 b5

D47

Lundin; Neo-Meran

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 b4

B31

Lutikov Gambit, Sicilian

1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 Nf6 6.d4

D70

Lutikov Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.f3

C90

Lutikov Variation, Ruy Lopez

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.Bc2

C90

Lutikov Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 9.Bd2

C68

Lutikov Variation, Ruy Lopez Exchange

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 bxc6

C33

MacDonnell Attack, KGA

1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.d4 Ne7 7.g3

C23

MacDonnell Gambit, Bishop

1.e4 e5 2.Bc4 Bc5 3.b4

C37

MacDonnell Gambit, KGA

1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Nc3

C77

Mackenzie Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d4

C20

Macleod Attack

1.e4 e5 2.c3

C34

MacLeod Defense, KGA

1.e4 e5 2.f4 exf4 3.Nf3 Nc6

C44

MacLopez; Relfsson Gambit, Scotch

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bb5

D00

Mad Dog Attack, BDG

1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.h4

A45

Maddigan Gambit

1.d4 Nf6 2.Nc3 e5

C30

Mafia Defense, KGD

1.e4 e5 2.f4 c5

C40

Mail Line, Latvian Gambit Accepted

1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4

A57

Main Line, Benko Gambit Declined

1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nf3

B52

Main Line, Canal Attack, Sicilian; B52

1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 

D19

Main Line, Czech Variation, Slav; D19

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O 9.Qe2

C52

Main Line, Evans Gambit; C52

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5

D80

Makogonov Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.b4

D94

Makogonov Variation, Grunfeld

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.b4

E71

Makogonov Variation, KID; E71

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.h3

C45

Malaniuk Variation, Scotch

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bb4+

A45

Malich Gambit

1.d4 Nf6 2.Nc3 d5 3.Bg5 c5 4.Bxf6 gxf6 5.e4 dxe4 6.d5

C83

Malkin Variation, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5

A45

Maltese Falcon

1.d4 Nf6 2.g4 Nxg4 3.f3 Nf6 4.e4

A10

Malvinas Variation, English

1.c4 d5 2.cxd5 Qxd5 3.Nc3 Qa5

A80

Manhattan Gambit, Dutch

1.d4 f5 2.Qd3 Nf6 3.g4

D51

Manhattan; Westphalia Variation, QGD

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Bb4

D23

Mannheim Variation, QGA

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Qa4+

B00

Mao Tse Tung; Duras

1.e4 f5

D18

Mareschall Variation, Slav; Lasker Variation

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 Na6

B62

Margate (Vitolins) Variation, Sicilian

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Bb5

A47

Marienbad Variation

1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5

B20

Marienbad Variation, Sicilian

1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Bb2

C25

Mariotti Gambit

1.e4 e5 2.Nc3 Nc6 3.g3 Bc5 4.Bg2 h5 5.Nf3 h4

B28

Maroczy Bind, O'Kelly Sicilian

1.e4 c5 2.Nf3 a6 3.c4

B36

Maroczy Bind, Sicilian; B36

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4

B07

Maroczy Defense, Pirc

1.e4 d6 2.d4 e5

C40

Maroczy Gambit

1.e4 e5 2.Nf3 d5 3.exd5 Bd6

B12

Maroczy Gambit, Caro-Kann

1.e4 c6 2.d4 d5 3.f3 dxe4 4.fxe4 e5 5.Nf3 exd4 6.Bc4

B74

Maroczy Line, Sicilian Dragon

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3 Be6 10.f4 Na5

C49

Maroczy Variation, 4 Knights

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Ne2

B02

Maroczy Variation, Alekhine

1.e4 Nf6 2.d3

B12

Maroczy Variation, Caro

1.e4 c6 2.d4 d5 3.f3

C14

Maroczy Variation, French

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 a6

C40

Maroczy; Elephant Gambit

1.e4 e5 2.Nf3 d5 3.exd5 Bd6

C18

Maroczy-Willis Variation, French

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 cxd4 6.axb4 dxc3

C30

Marshall (Euwe) Attack, KGD

1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 Bg4 5.fxe5 dxe5 6.Qa4+

C89

Marshall Attack, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5

C31

Marshall C-G, KGD

1.e4 e5 2.f4 d5 3.exd5 c6

C89

Marshall Counter-Attack, Ruy Lopez

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.d4

D06

Marshall Defense; Knight Defense, QGD

1.d4 d5 2.c4 Nf6 

C48

Marshall Gambit, Four Knights

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5 5.Nxe5 Nd4 6.Ba4 O-O

B00

Marshall Gambit, Nimzovich

1.e4 Nc6 2.d4 d5 3.exd5 Qxd5 4.Nc3

B01

Marshall Gambit, Scandanavian G; Modern Variation, CC

1.e4 d5 2.exd5 Nf6  

D31

Marshall Gambit, Semi-Slav

1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 

B23

Marshall Gambit, Sicilian

1.e4 c5 2.Nc3 e6 3.d4 d5

D32

Marshall Gambit, Tarrasch

1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.e4

C56

Marshall Variation, 2 Knights

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be7 9.Ng5 Qd5 10.Nc3 Qf5

B01

Marshall Variation, Center Counter

1.e4 d5 2.exd5 Nf6 3.d4 Nxd5

C10

Marshall Variation, French

1.e4 e6 2.d4 d5 3.Nc3 c5

C42

Marshall Variation, Petroff

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6

B20

Marshall Variation, Sicilian

1.e4 c5 2.b4 cxb4 3.a3 

B41

Marshall Variation, Sicilian

1.e4 c5 2.Nf3 e6 3.d4 d5

B10

Masi Variation, Caro-Kann

1.e4 c6 2.d4 Nf6

D00

Mason Attack, Queen Pawn Game

1.d4 d5 2.f4

C40

Mason Countergambit, Latvian

1.e4 e5 2.Nf3 f5 3.d4

C54

Mason Gambit, Italian

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.O-O

C42

Mason Variation, Petroff

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O O-O

C42

Mason-Showalter Variation, Petroff

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6

B10

Massachussets Defense, Caro-Kann

1.e4 c6 2.d4 f5

B06

Masur Gambit

1.e4 g6 2.d4 Nh6 3.Nc3 f5 4.Bxh6 Bxh6 5.exf5 O-O

B82

Matanovic Attack, Sicilian; B82

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.f4

B00

Matovinsky Gambit

1.e4 b6 2.d4 Bb7 3.Bd3 f5

B00

Matovinsky Gambit

1.e4 b6 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g6

B02

Matsukevich Gambit, Alekhine

1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5 Nd5 5.Nc3 Nxc3 6.dxc3 d6 7.Bg5

A89

Matulovic Variation, Dutch; A89

1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6 7.Nc3 Nc6

C33

Maurian Defense, KGA

1.e4 e5 2.f4 exf4 3.Bc4 Nc6

C56

Max Lange Attack

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5

C40

Mayet Attack, Latvian

1.e4 e5 2.Nf3 f5 3.Bc4 

C38

Mayet Gambit, KGA

1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.d4 d6 6.c3

A22

Mazedonisch Variation, English

1.c4 e5 2.Nc3 Nf6 3.f4

C40

McConnell Defense

1.e4 e5 2.Nf3 Qf6

C12

McCutcheon Variation, French

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4