C07 French Defense: Tarrasch Variation, Open System
C07 holds seven named lines, all under the name French Defense. It leaves C03 (French Defense: Tarrasch Variation) with 3...c5. Its deepest line, French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line, runs to 10...a6, level for the longest of the 19 French Defense codes. Material is no longer level at the end of two of its lines; the widest gap, one pawn in Black’s favour, comes in French Defense: Tarrasch Variation, Eliskases Variation.
| # | White | Black |
|---|---|---|
| 1 | e4 | e6 |
| 2 | d4 | d5 |
| 3 | Nd2 | c5 |
The move that completes C07
The reference line of C08 plays all of these moves and continues beyond them; C07 is the position reached at 3...c5.
- 3...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.
Lines filed under C07
All seven share their first six plies, the whole reference line and then split three ways at White’s move 4.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| French Defense: Tarrasch Variation, Open System | (the shared start itself) | 6 | |
| French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | 4.Ngf3 | 7 | |
| French Defense: Tarrasch Variation, Open System, Süchting Line | 4.c3 | 7 | |
| French Defense: Tarrasch Variation, Chistyakov Defense | 4.exd5 Qxd5 | 8 | |
| French Defense: Tarrasch Variation, Open System, Shaposhnikov Gambit | 4.exd5 Nf6 | 8 | White +1 |
| French Defense: Tarrasch Variation, Eliskases Variation | 4.exd5 Qxd5 5.Ngf3 cxd4 6.Bc4 Qd8 | 12 | Black +1 |
| French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line | 4.exd5 Qxd5 5.Ngf3 cxd4 6.Bc4 Qd6 7.O-O Nf6 8.Nb3 Nc6 9.Nbxd4 Nxd4 10.Nxd4 a6 | 20 | White castled |
The road to C07
- 1.e4 … 2.d4three earlier stops: B00, C00
- 2...d5C00 French Defense
- 3.Nd2C03 Tarrasch Variation
- 3...c5C07
The position after 3...c5
White has brought out the knight on d2; Black has not yet moved a knight or bishop. White could capture with dxc5, exd5. White is to move and has 33 legal moves.
Codes that branch off from C07
The reference lines of one other code leave C07 from the position after 3...c5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| C08 | 4.exd5 exd5 | French Defense: Tarrasch Variation, Open System |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C05 | French Defense: Tarrasch Variation, Closed Variation | four squares: c5, f6, c7, g8 |
| C10 | French Defense: Paulsen Variation | four squares: d2, c3, c5, c7 |
| B15 | Caro-Kann Defense | six squares: d2, c3, c5, c6, e6, e7 |
| C01 | French Defense: Exchange Variation | six squares: b1, d2, e4, c5, d5, c7 |
| C02 | French Defense: Advance Variation | six squares: b1, d2, e4, c5, e5, c7 |
| C09 | French Defense: Tarrasch Variation, Open System, Main Line | six squares: g1, f3, e4, c6, e6, b8 |
| C11 | French Defense: Classical Variation | six squares: d2, c3, c5, f6, c7, g8 |
Where lines continue from here
Four named lines filed under other codes pass through the position after 3...c5. Besides the codes above, they belong to C09.