C80 Ruy Lopez: Open
C80 holds 18 named lines, all under the name Ruy Lopez. It leaves C78 (Ruy Lopez: Morphy Defense) with 5...Nxe4. When the reference line ends, Black is one pawn up on material. With 18 named lines it is the second-largest code of the 40 Ruy Lopez codes.
| # | White | Black |
|---|---|---|
| 1 | e4 | e5 |
| 2 | Nf3 | Nc6 |
| 3 | Bb5 | a6 |
| 4 | Ba4 | Nf6 |
| 5 | O-O | Nxe4 |
The move that completes C80
The reference line of C81 plays all of these moves and continues beyond them; C80 is the position reached at 5...Nxe4.
- 5...Nxe4 The knight on f6 takes the pawn on e4, opening a line for the queen on d8.
Lines filed under C80
All 18 share their first ten plies, the whole reference line and then split four ways at White’s move 6.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Ruy Lopez: Open | (the shared start itself) | 10 | Black +1, White castled |
| Ruy Lopez: Morphy Defense, Tartakower Variation | 6.Qe2 | 11 | Black +1, White castled |
| Ruy Lopez: Open | 6.d4 | 11 | Black +1, White castled |
| Ruy Lopez: Open, Knorre Variation | 6.Nc3 | 11 | Black +1, White castled |
| Ruy Lopez: Open, Riga Variation | 6.d4 exd4 | 12 | Black +2, White castled |
| Ruy Lopez: Open, Skipworth Gambit | 6.Re1 d5 | 12 | Black +1, White castled |
| Ruy Lopez: Open | 6.d4 b5 7.Bb3 | 13 | Black +1, White castled |
| Ruy Lopez: Open, Friess Attack | 6.d4 b5 7.Nxe5 | 13 | White castled |
| Ruy Lopez: Open, Richter Variation | 6.d4 b5 7.d5 | 13 | Black +1, White castled |
| Ruy Lopez: Open | 6.d4 b5 7.Bb3 d5 8.dxe5 | 15 | White castled |
| Ruy Lopez: Open, Harksen Gambit | 6.d4 b5 7.Bb3 d5 8.c4 | 15 | Black +1, White castled |
| Ruy Lopez: Open, Main Line | 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 | 16 | White castled |
| Ruy Lopez: Open, Schlechter Defense | 6.d4 b5 7.Bb3 d5 8.a4 Nxd4 | 16 | Black +2, White castled |
| Ruy Lopez: Open, Zukertort Variation | 6.d4 b5 7.Bb3 d5 8.dxe5 Ne7 | 16 | White castled |
| Ruy Lopez: Open, Bernstein Variation | 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 | 17 | White castled |
| Ruy Lopez: Open, Berger Variation | 6.d4 b5 7.Bb3 d5 8.a4 Nxd4 9.Nxd4 exd4 10.Nc3 | 19 | Black +2, White castled |
| Ruy Lopez: Open, Bernstein Variation, Luther Line | 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Bc5 10.Qe1 | 19 | White castled |
| Ruy Lopez: Open, Karpov Gambit | 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Nc5 10.c3 d4 11.Ng5 | 21 | White castled |
The road to C80
- 1.e4 … 3.Bb5five earlier stops: B00, C20, C40, C44, C60
- 3...a6C70 Morphy Defense
- 5.O-OC78 Morphy Defense
- 5...Nxe4C80
The position after 5...Nxe4
White has brought out the knight on f3 and bishop on a4; Black the knight on c6 and knight on e4. White has a half-open e-file. White could capture with Bxc6, Nxe5. White is to move and has 25 legal moves.
Codes that branch off from C80
The reference lines of two other codes leave C80 from the position after 8...Be6, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| C81 | 9.Qe2 | Ruy Lopez: Open, Howell Attack |
| C82 | 9.c3 | Ruy Lopez: Open |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C67 | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | four squares: a4, b5, a6, a7 |
| C72 | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | four squares: e4, d6, d7, g8 |
| C79 | Ruy Lopez: Morphy Defense, Steinitz Deferred | four squares: e4, d6, f6, d7 |
| C84 | Ruy Lopez: Closed | four squares: e4, f6, e7, f8 |
| C69 | Ruy Lopez: Exchange Variation, Normal Variation | five squares: a4, e4, c6, d7, g8 |
| C85 | Ruy Lopez: Closed, Delayed Exchange | six squares: a4, e4, c6, f6, e7, f8 |
| C86 | Ruy Lopez: Closed, Worrall Attack | six squares: d1, e2, e4, f6, e7, f8 |
Where lines continue from here
Sixteen named lines filed under other codes pass through the position after 5...Nxe4. Besides the codes above, they belong to C83.