C83 Ruy Lopez: Open, Classical Defense
C83 holds six named lines, all under the name Ruy Lopez. It leaves C82 (Ruy Lopez: Open) with 9...Be7. Black has four minor pieces off their first squares, the most of the 40 Ruy Lopez codes. Material is no longer level at the end of two of its lines; the widest gap, three pawns in White’s favour, comes in Ruy Lopez: Open, Tarrasch Trap.
| # | White | Black |
|---|---|---|
| 1 | e4 | e5 |
| 2 | Nf3 | Nc6 |
| 3 | Bb5 | a6 |
| 4 | Ba4 | Nf6 |
| 5 | O-O | Nxe4 |
| 6 | d4 | b5 |
| 7 | Bb3 | d5 |
| 8 | dxe5 | Be6 |
| 9 | c3 | Be7 |
Moves only C83 plays
Same as C82 up to 9.c3, then:
- 9...Be7 The bishop leaves f8 for e7, opening a line for the rook on h8.
Lines filed under C83
All six share the start 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 and then split two ways at Black’s move 6.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Ruy Lopez: Open, Classical Defense | 6...b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 | 18 | White castled |
| Ruy Lopez: Open, Classical Defense, Main Line | 6...Be7 7.Re1 b5 8.Bb3 d5 9.dxe5 Be6 10.c3 | 19 | White castled |
| Ruy Lopez: Open, Classical Defense | 6...b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Nc5 10.c3 Be7 | 20 | White castled |
| Ruy Lopez: Open, Malkin Variation | 6...b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Nbd2 O-O 11.Qe2 | 21 | both castled |
| Ruy Lopez: Open, Breslau Variation | 6...b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Re1 O-O 11.Nd4 Nxe5 | 22 | Black +1, both castled |
| Ruy Lopez: Open, Tarrasch Trap | 6...b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Re1 O-O 11.Nd4 Qd7 12.Nxe6 fxe6 13.Rxe4 | 25 | White +3, both castled |
The road to C83
The position after 9...Be7
White has brought out the knight on f3 and bishop on b3; Black the knight on c6, knight on e4, bishop on e6 and bishop on e7. White has a half-open d-file; Black a half-open e-file. White could capture with Bxd5, Qxd5. White is to move and has 32 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C81 | Ruy Lopez: Open, Howell Attack | six squares: d1, c2, e2, c3, e7, f8 |
| C88 | Ruy Lopez: Closed | 12 squares: e1, f1, c2, d2, c3, e4, d5, e5 … |
| C89 | Ruy Lopez: Marshall Attack | 12 squares: e1, f1, d2, e4, e5, e6, f6, c8 … |
| C80 | Ruy Lopez: Open | 14 squares: c2, d2, b3, c3, a4, b5, d5, e5 … |
| C84 | Ruy Lopez: Closed | 14 squares: c2, d2, b3, c3, a4, e4, b5, d5 … |
| C85 | Ruy Lopez: Closed, Delayed Exchange | 14 squares: c2, d2, b3, c3, e4, b5, d5, e5 … |
| C90 | Ruy Lopez: Closed | 14 squares: e1, f1, d2, e4, d5, e5, d6, e6 … |