C90 Ruy Lopez: Closed
C90 holds four named lines, all under the name Ruy Lopez. It leaves C88, a position of the same name, with 7...d6 8.c3 O-O. Both kings have castled by the end of the reference line, White on move 5 and Black on move 8. None of its four lines contains a capture.
| # | White | Black |
|---|---|---|
| 1 | e4 | e5 |
| 2 | Nf3 | Nc6 |
| 3 | Bb5 | a6 |
| 4 | Ba4 | Nf6 |
| 5 | O-O | Be7 |
| 6 | Re1 | b5 |
| 7 | Bb3 | d6 |
| 8 | c3 | O-O |
The move that completes C90
The reference line of C91 plays all of these moves and continues beyond them; C90 is the position reached at 8...O-O.
- 8...O-O Black castles kingside, opening a line for the queen on d8, guarding the pawn on g7.
Lines filed under C90
All four share the start 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 and then split two ways at Black’s move 7.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Ruy Lopez: Closed | 7...d6 8.c3 O-O | 16 | both castled |
| Ruy Lopez: Closed, Lutikov Variation | 7...d6 8.c3 O-O 9.Bc2 | 17 | both castled |
| Ruy Lopez: Closed, Pilnik Variation | 7...O-O 8.d3 d6 9.c3 | 17 | both castled |
| Ruy Lopez: Closed, Suetin Variation | 7...d6 8.c3 O-O 9.a3 | 17 | both castled |
Ruy Lopez: Closed, Lutikov Variation
- 7...d6 The d-pawn advances to d6, covering c5 and e5, opening a line for the bishop on c8 and the queen on d8.
- 8.c3 The c-pawn advances to c3, covering b4 and d4, opening a line for the queen on d1 and the bishop on b3.
- 8...O-O Black castles kingside, opening a line for the queen on d8, guarding the pawn on g7.
- 9.Bc2 The bishop goes from b3 to c2.
Ruy Lopez: Closed, Pilnik Variation
- 7...O-O Black castles kingside, opening a line for the queen on d8, guarding the pawn on g7.
- 8.d3 The d-pawn advances to d3, covering c4 and e4, opening a line for the bishop on c1 and the queen on d1.
- 8...d6 The d-pawn advances to d6, covering c5 and e5, opening a line for the bishop on c8 and the queen on d8.
- 9.c3 The c-pawn advances to c3, covering b4 and d4, opening a line for the queen on d1 and the bishop on b3.
Ruy Lopez: Closed, Suetin Variation
- 7...d6 The d-pawn advances to d6, covering c5 and e5, opening a line for the bishop on c8 and the queen on d8.
- 8.c3 The c-pawn advances to c3, covering b4 and d4, opening a line for the queen on d1 and the bishop on b3.
- 8...O-O Black castles kingside, opening a line for the queen on d8, guarding the pawn on g7.
- 9.a3 The a-pawn advances to a3, covering b4, opening a line for the rook on a1.
The road to C90
- 1.e4 … 5.O-Oseven earlier stops: B00, C20, C40, C44, C60, C70, C78
- 5...Be7C84 Closed
- 7.Bb3C88 Closed
- 8...O-OC90
The position after 8...O-O
White has brought out the knight on f3 and bishop on b3; Black the knight on c6, knight on f6 and bishop on e7. White could capture with Bxf7+, Nxe5. White is to move and has 27 legal moves.
Codes that branch off from C90
The reference lines of two other codes leave C90 from the position after 8...O-O, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| C91 | 9.d4 | Ruy Lopez: Closed, Yates Variation |
| C92 | 9.h3 | Ruy Lopez: Closed |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C89 | Ruy Lopez: Marshall Attack | two squares: d5, d6 |
| C93 | Ruy Lopez: Closed, Smyslov Defense | four squares: h2, h3, h6, h7 |
| C94 | Ruy Lopez: Closed, Breyer Defense | four squares: h2, h3, c6, b8 |
| C97 | Ruy Lopez: Closed, Chigorin Defense | four squares: h2, h3, a5, c6 |
| C95 | Ruy Lopez: Closed, Breyer | six squares: d2, h2, h3, d4, c6, b8 |
| C96 | Ruy Lopez: Closed, Chigorin Defense | six squares: c2, h2, b3, h3, a5, c6 |
| C87 | Ruy Lopez: Closed, Averbakh Variation | ten squares: c2, b3, c3, a4, b5, b7, e8, f8 … |
Where lines continue from here
Twenty-eight named lines filed under other codes pass through the position after 8...O-O. Besides the codes above, they belong to C93, C94, C95, C96, C97, C98, C99.