O'Kelly Variation, Réti SystemB28
1. e4 c5 2. Nf3 a6 3. g3
In the centre, White holds e4.
- 2. Nf3 Develops the knight to f3, eyeing d4 and e5.
- 2... a6 Takes b5 away from White's bishop. Theory calls this the O'Kelly Variation.
B20-B99
Sicilian Defense
391 named lines in this family, ECO B20-B99. Every one of them opens 1. e4 c5, so the notes on those moves are written once, just below, instead of once per line. Under each line you get its moves and the sentences it adds that this page has not already printed; sixty lines to a page. A line's own page carries up to its first 4 per-move notes in full.
The moves every line here plays
1. e4 c5
- 1. e4 Stakes a claim in the centre, controlling d5, and frees the bishop and queen.
- 1... c5 Fights for d4 from the flank - contesting the centre without committing a centre pawn. Theory calls this the Sicilian Defense.
O'Kelly Variation, Venice SystemB28
1. e4 c5 2. Nf3 a6 3. c3
O'Kelly Variation, Wing GambitB28
1. e4 c5 2. Nf3 a6 3. b4
O'Kelly Variation, Yerevan SystemB28
1. e4 c5 2. Nf3 a6 3. Nc3
O'Kelly Variation, Maróczy Bind, Paulsen LineB28
1. e4 c5 2. Nf3 a6 3. c4 e6
O'Kelly Variation, Maróczy Bind, Robatsch LineB28
1. e4 c5 2. Nf3 a6 3. c4 d6
O'Kelly Variation, Venice System, Barcza LineB28
1. e4 c5 2. Nf3 a6 3. c3 Nf6
O'Kelly Variation, Venice System, Ljubojevic LineB28
1. e4 c5 2. Nf3 a6 3. c3 b5
O'Kelly Variation, Venice System, Steiner LineB28
1. e4 c5 2. Nf3 a6 3. c3 d6
O'Kelly Variation, Normal System, Cortlever GambitB28
1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Bc4
An early pawn trade leaves the c-file as Black's avenue and the d-file as White's - both sides get real winning chances down their own file. Black keeps the extra pawn; White plays for time, open lines, and initiative - the classic gambit trade. Black trades the c-pawn for White's d-pawn and plays for an unbalanced fight: queenside counterplay against White's central and kingside ambitions.
O'Kelly Variation, Normal System, Smith-Morra LineB28
1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. c3
Black comes out ahead on material - White needs concrete play to justify it.
O'Kelly Variation, Normal System, Zagorovsky LineB28
1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Qxd4
O'Kelly Variation, Normal System, Taimanov LineB28
1. e4 c5 2. Nf3 a6 3. d4 cxd4 4. Nxd4 e5
O'Kelly Variation, Venice System, Gambit LineB28
1. e4 c5 2. Nf3 a6 3. c3 d5 4. exd5 Nf6
An early pawn trade leaves the d-file as Black's avenue and the e-file as White's - both sides get real winning chances down their own file. White is up material out of the opening - Black is banking on activity to show for it.
Nimzowitsch VariationB29
1. e4 c5 2. Nf3 Nf6
- 2... Nf6 Develops the knight to f6, eyeing d5 and e4. Theory calls this the Nimzowitsch Variation.
Nimzowitsch Variation, Advance VariationB29
1. e4 c5 2. Nf3 Nf6 3. e5
In the centre, White holds e5.
Nimzowitsch Variation, Closed VariationB29
1. e4 c5 2. Nf3 Nf6 3. Nc3
Nimzowitsch Variation, Exchange VariationB29
1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 Nxc3
Nimzowitsch Variation, Main LineB29
1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 e6 5. Nxd5 exd5 6. d4 Nc6
The structure hands Black the half-open e-file - rook pressure down it is a standing plan.
Old SicilianB30
1. e4 c5 2. Nf3 Nc6
- 2... Nc6 Develops the knight to c6, eyeing d4 and e5. Theory calls this the Old Sicilian.
Nyezhmetdinov-Rossolimo AttackB30
1. e4 c5 2. Nf3 Nc6 3. Bb5
Portsmouth GambitB30
1. e4 c5 2. Nf3 Nc6 3. b4
Closed, Anti-Sveshnikov VariationB30
1. e4 c5 2. Nf3 Nc6 3. Nc3 e5
In the centre, White holds e4 while Black holds e5.
Nyezhmetdinov-Rossolimo Attack, Brooklyn Retreat DefenseB30
1. e4 c5 2. Nf3 Nc6 3. Bb5 Nb8
Black's pawn on d7 is pinned against the king.
Nyezhmetdinov-Rossolimo Attack, San Francisco GambitB30
1. e4 c5 2. Nf3 Nc6 3. Bb5 Na5 4. b4
Closed, Anti-Sveshnikov Variation, with Nf6B30
1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 Nf6
Closed, Anti-Sveshnikov Variation, with d6B30
1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 d6
Closed, Anti-Sveshnikov Variation, Kharlov-Kramnik LineB30
1. e4 c5 2. Nf3 Nc6 3. Nc3 e5 4. Bc4 Be7 5. d3 d6 6. Nd2 Bg5
Nyezhmetdinov-Rossolimo Attack, Fianchetto VariationB31
1. e4 c5 2. Nf3 Nc6 3. Bb5 g6
Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld GambitB31
1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 e5 6. d4
The pawns on d4 and e5 stand in direct tension - the first player to resolve it chooses the structure. Black's kingside bishop takes the long diagonal.
Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Lutikov GambitB31
1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 Nf6 6. d4
Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Totsky AttackB31
1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. c3 Nf6 6. Qa4
Nyezhmetdinov-Rossolimo Attack, Gurgenidze VariationB31
1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. O-O Bg7 5. Re1 e5 6. b4
Open, through 3. d4B32
1. e4 c5 2. Nf3 Nc6 3. d4
In the centre, White holds d4 and e4.
Franco-Sicilian VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 e6
Open, after 3... cxd4, through 3... cxd4B32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4
Open, after 3... cxd4, through 4. Nxd4B32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4
Accelerated DragonB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6
By fianchettoing before ...d6, Black keeps ...d5 in one move as an equalizing break - but must respect the Maroczy bind (c4) that this move order allows.
Flohr VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qc7
Godiva VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Qb6
Löwenthal VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5
Nimzo-American VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d5
Kalashnikov VariationB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 d6
O'Kelly Variation, Maróczy Bind, Geller LineB32
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 a6 5. c4 e5
Open, after 3... cxd4, through 4... Nf6B33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6
Lasker-Pelikan VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5
Lasker-Pelikan Variation, Exchange VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nxc6
Lasker-Pelikan Variation, Retreat VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nf3
Lasker-Pelikan Variation, Schlechter VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nb3
Lasker-Pelikan Variation, Bird VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 Be6
Lasker-Pelikan Variation, Sveshnikov Variation, through 8... b5B33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5
Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5
Lasker-Pelikan Variation, Sveshnikov Variation, after 9. Bxf6B33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5
Black has doubled pawns on the f-file.
Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk VariationB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 Bg7
Lasker-Pelikan Variation, Sveshnikov Variation, Peresypkin's SacrificeB33
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 11. Bxb5
Black's knight on c6 is pinned against the king.
Accelerated Dragon, Exchange VariationB34
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nxc6
Accelerated Dragon, Modern VariationB34
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3
Accelerated Dragon, Modern Bc4 VariationB35
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4
Dragon Variation, Modern Bc4 VariationB35
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 d6
The g7 bishop is the whole point - it rakes the long diagonal while both sides race: White storms the h-file, Black sacrifices down the c-file.
Accelerated Dragon, Maróczy Bind, through 5. c4B36
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4
Lines 121–180 of 391 — page 3 of 7.
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