B50 Sicilian Defense: Modern Variations
B50 holds 12 named lines, all under the name Sicilian Defense. It leaves B27 (Sicilian Defense) with 2...d6. Lines of 39 other codes continue from its position, the third-widest spread of the 80 Sicilian Defense codes. Material is no longer level at the end of four of its lines; the widest gap, one pawn in Black’s favour, comes in Sicilian Defense.
| # | White | Black |
|---|---|---|
| 1 | e4 | c5 |
| 2 | Nf3 | d6 |
The move that completes B50
The reference line of B51 plays all of these moves and continues beyond them; B50 is the position reached at 2...d6.
- 2...d6 The d-pawn advances to d6, covering c5 and e5, opening a line for the bishop on c8 and the queen on d8.
Lines filed under B50
All 12 share their first four plies, the whole reference line and then split five ways at White’s move 3.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Sicilian Defense: Modern Variations | (the shared start itself) | 4 | |
| Sicilian Defense | 3.d4 | 5 | |
| Sicilian Defense: Delayed Alapin Variation, with d6 | 3.c3 | 5 | |
| Sicilian Defense: Kopec System | 3.Bd3 | 5 | |
| Sicilian Defense: Wing Gambit, Deferred Variation | 3.b4 | 5 | |
| Sicilian Defense | 3.d4 cxd4 | 6 | Black +1 |
| Sicilian Defense: Kotov Gambit | 3.g3 b5 | 6 | |
| Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order | 3.d4 Nf6 | 6 | |
| Sicilian Defense: Modern Variations, Tartakower | 3.d4 cxd4 4.c3 | 7 | Black +1 |
| Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted | 3.d4 Nf6 4.dxc5 Nxe4 | 8 | |
| Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Gambit | 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4 | 12 | Black +1 |
| Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Double Gambit | 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4 7.d5 Qa5+ 8.Nc3 Nxc3 9.bxc3 | 17 | Black +1 |
The road to B50
- 1.e4one earlier stop: B00
- 1...c5B20 Sicilian Defense
- 2.Nf3B27 Sicilian Defense
- 2...d6B50
The position after 2...d6
White has brought out the knight on f3; Black has not yet moved a knight or bishop. White is to move and has 28 legal moves.
Codes that branch off from B50
The reference lines of three other codes leave B50 from two of its named positions; “From” gives the last part of that position’s name.
| Code | From | Moves | Reference line |
|---|---|---|---|
| B51 | Modern Variations | 3.Bb5+ | Sicilian Defense: Moscow Variation |
| B53 | Sicilian Defense | 4.Qxd4 | Sicilian Defense: Chekhover Variation |
| B54 | Sicilian Defense | 4.Nxd4 g6 | Sicilian Defense: Dragon Variation, Accelerated Dragon |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| B20 | Sicilian Defense | four squares: g1, f3, d6, d7 |
| B28 | Sicilian Defense: O’Kelly Variation | four squares: a6, d6, a7, d7 |
| B29 | Sicilian Defense: Nimzowitsch Variation | four squares: d6, f6, d7, g8 |
| B30 | Sicilian Defense: Old Sicilian | four squares: c6, d6, d7, b8 |
| B40 | Sicilian Defense: French Variation | four squares: d6, e6, d7, e7 |
| B52 | Sicilian Defense: Moscow Variation, Main Line | four squares: f1, b5, d7, c8 |
| C41 | Philidor Defense | four squares: c5, e5, c7, e7 |
Where lines continue from here
Besides the codes above, they belong to B52, B55, B56, B57, B58, B60, B62, B63, B64, B65, B66, B70, B71, B72, B73, B74, B75, B76, B77, B78, B79, B80, B84, B85, B87, B89, B90, B91, B92, B93, B94, B95, B96, B97, B98, B99.