B64 Sicilian Defense: Richter-Rauzer Variation, Classical Variation
B64 holds two named lines, all under the name Sicilian Defense. It leaves B63, a position of the same name, with 8.O-O-O O-O 9.f4. Queenside castling appears in two of its lines, first in Sicilian Defense: Richter-Rauzer Variation, Classical Variation. Both kings have castled by the end of the reference line, White on move 8 and Black on move 8.
| # | White | Black |
|---|---|---|
| 1 | e4 | c5 |
| 2 | Nf3 | d6 |
| 3 | d4 | cxd4 |
| 4 | Nxd4 | Nf6 |
| 5 | Nc3 | Nc6 |
| 6 | Bg5 | e6 |
| 7 | Qd2 | Be7 |
| 8 | O-O-O | O-O |
| 9 | f4 |
The move that completes B64
The reference line of B65 plays all of these moves and continues beyond them; B64 is the position reached at 9.f4.
- 9.f4 The f-pawn advances two squares to f4, covering e5 and g5.
Lines filed under B64
Both share the start 1.e4 c5 2.Nf3 and then split two ways at Black’s move 2.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Sicilian Defense: Richter-Rauzer Variation, Classical Variation | 2...d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 | 17 | both castled |
| Sicilian Defense: Richter-Rauzer Variation, Classical Variation | 2...Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 e5 | 18 | both castled |
Sicilian Defense: Richter-Rauzer Variation, Classical Variation
- 2...Nc6 The knight leaves b8 for c6, opening a line for the rook on a8.
- 3.d4 The d-pawn advances two squares to d4, covering c5 and e5, opening a line for the bishop on c1 and the queen on d1.
- 3...cxd4 The c-pawn takes the pawn on d4, covering c3 and e3.
- 4.Nxd4 The knight on f3 takes the pawn on d4, opening a line for the queen on d1, attacking the knight on c6.
- 4...Nf6 The knight leaves g8 for f6, opening a line for the rook on h8.
The road to B64
- 1.e4 … 6...e6ten earlier stops: B00, B20, B27, B50, B54, B56, B60, B62
- 7.Qd2B63 Traditional Variation
- 7...Be7B63 Classical Variation
- 9.f4B64
The position after 9.f4
White has brought out the knight on c3, knight on d4 and bishop on g5; Black the knight on c6, knight on f6 and bishop on e7. White has a half-open d-file; Black a half-open c-file. Black could capture with Nxd4, Nxe4. Black is to move and has 29 legal moves.
Codes that branch off from B64
The reference lines of one other code leave B64 from the position after 9.f4, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| B65 | 9...Nxd4 | Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| B68 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | eight squares: a6, a7, d7, c8, e8, f8, g8, h8 |
| B67 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | 11 squares: f2, f4, a6, a7, d7, e7, c8, e8 … |
| B62 | Sicilian Defense: Richter-Rauzer Variation | 12 squares: a1, c1, d1, e1, d2, f2, f4, e7 … |
| B78 | Sicilian Defense: Dragon Variation, Yugoslav Attack | 12 squares: f1, e3, f3, c4, f4, g5, e6, g6 … |
| B99 | Sicilian Defense: Najdorf Variation, Main Line | 12 squares: d2, f3, a6, c6, a7, c7, d7, d8 … |
| B60 | Sicilian Defense: Richter-Rauzer Variation | 13 squares: a1, c1, d1, e1, d2, f2, f4, e6 … |
| B66 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations | 13 squares: a1, c1, d1, e1, f2, f4, a6, a7 … |
Where lines continue from here
Two named lines filed under other codes pass through the position after 9.f4. All of them belong to the codes listed above.