Opening Theory

1. e4 c5
{Sicilian Defence}

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6
{Sicilian Defence, Najdorf Variation}

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6
{Sicilian Defence, Accelerated Dragon}

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4
{Sicilian Defence, Accelerated Dragon, Maroczy Bind}

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6
{Sicilian Defence, Taimanov Variation}

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4
{Sicilian Defence, Taimanov Variation, Maroczy Bind}

1. e4 e5 2. Nf3 Nc6 3. Bb5
{Ruy Lopez; also called the Spanish Game}

1. e4 e5 2. Nf3 Nc6 3. Bc4
{Italian Game}

1. e4 e5 2. Nf3 Nc6 3. d4
{Scotch Game}

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Qh4
{Scotch Game, Steinitz Variation; the move ...Qh4 is dubious}

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5
{Caro-Kann Defense, Classical Variation}

1. d4 Nf6 2. c4 e6 3. g3
{Catalan Opening}

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4
{Catalan Opening, Open Variation; also called the Open Catalan}

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7
{Catalan Opening, Closed Variation; also called the Closed Catalan}

1. d4 Nf6 2. c4 c5
{Benoni Defence}

1. d4 Nf6 2. c4 c5 3. d5
{Benoni Defence, Main Line}

1. d4 d5 2. c4 e6
{Queen's Gambit Declined, in short QGD}

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7
{QGD, Main Line}

1. Nf3
{Zukertort Opening; sometimes called the Reti Opening but that is not quite accurate}

1. Nf3 d5 2. c4
{Reti Opening}

1. Nc3
{Dunst Opening; also called the Van Geet Opening}

1. a3
{Anderssen's Opening, named after Adolf Anderssen}