C91 Ruy Lopez: Closed, Yates Variation
C91 holds three named lines, all under the name Ruy Lopez. It leaves C90 (Ruy Lopez: Closed) with 9.d4. Both kings have castled by the end of the reference line, White on move 5 and Black on move 8. That final move, by the d-pawn, covers c5 and e5 and opens a line for the bishop on c1 and the queen on d1.
| # | 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 |
| 9 | d4 |
Lines filed under C91
All three share their first 17 plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Ruy Lopez: Closed, Yates Variation | (the shared start itself) | 17 | both castled |
| Ruy Lopez: Closed, Bogoljubow Variation | 9...Bg4 | 18 | both castled |
| Ruy Lopez: Closed, Yates Variation, Short Attack | 9...Bg4 10.a4 | 19 | both castled |
Ruy Lopez: Closed, Bogoljubow Variation
- 9...Bg4 The bishop leaves c8 for g4, opening a line for the rook on a8 and the queen on d8, attacking the knight on f3.
Ruy Lopez: Closed, Yates Variation, Short Attack
- 9...Bg4 The bishop leaves c8 for g4, opening a line for the rook on a8 and the queen on d8, attacking the knight on f3.
- 10.a4 The a-pawn advances two squares to a4, covering b5, opening a line for the rook on a1.
The road to C91
- 1.e4 … 6...b5eight earlier stops: B00, C20, C40, C44, C60, C70, C78, C84
- 7.Bb3C88 Closed
- 8...O-OC90 Closed
- 9.d4C91
The position after 9.d4
White has brought out the knight on f3 and bishop on b3; Black the knight on c6, knight on f6 and bishop on e7. Black could capture with Nxd4, Nxe4, exd4. Black is to move and has 31 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C89 | Ruy Lopez: Marshall Attack | four squares: d2, d4, d5, d6 |
| C92 | Ruy Lopez: Closed | four squares: d2, h2, h3, d4 |
| C95 | Ruy Lopez: Closed, Breyer | four squares: h2, h3, c6, b8 |
| C93 | Ruy Lopez: Closed, Smyslov Defense | six squares: d2, h2, h3, d4, h6, h7 |
| C94 | Ruy Lopez: Closed, Breyer Defense | six squares: d2, h2, h3, d4, c6, b8 |
| C97 | Ruy Lopez: Closed, Chigorin Defense | six squares: d2, h2, h3, d4, a5, c6 |
| C96 | Ruy Lopez: Closed, Chigorin Defense | eight squares: c2, d2, h2, b3, h3, d4, a5, c6 |