Open Game Deep Lines: French, Tarrasch 3...c5 4.exd5
The Open Tarrasch: symmetrical structure with free piece play.
Open Game Deep Lines: French, Tarrasch 3...c5 4.exd5 is one of the most compelling entries in the Encyclopaedia of Chess Openings — and a line that repays every hour you sink into it.
After 5.Ngf3 the position resolves into a tense centre: the central pawns still face each other, and the timing and manner of the coming exchange shapes the whole middlegame, with the e-file fully open.
The French, Tarrasch 3...c5 4.exd5 is one of the defining branches of the Open Game Deep Lines — the line you reach when both players want the full fight rather than a quiet draw.
The moves
After 5. Ngf3 — Open Game Deep Lines: French, Tarrasch 3...c5 4.exd5 main line
Position breakdown
A factual read of the position after the main line — the files, the centre, the pawn structure and king safety that decide how the middlegame is played. These are computed from the actual board, not generic advice.
Files
Centre control
Tense centre
The d4/d5/e4/e5 squares — who occupies the centre decides how open the game becomes.
Pawn skeleton
Pawns only — the structure that explains every open file and majority at a glance.
Material level
Queenside pawns 3–3
Kingside pawns 3–3
Development
2 knights active
No minor pieces developed yet
King safety
White king e1
Uncastled — take care
Black king e8
Uncastled — take care
Computed from the final position of the main line above — 9 plies, black to move.
Strategic ideas
Ideas for White
Master the move-order subtleties: these lines transpose or diverge by a single tempo, and knowing which is which is preparation itself.
Ideas for Black
Pick one defence per main system and drill it deep — open games reward specialists over generalists.
Plans & pawn structures
- 1Fight for the e-file: it is the only fully open line in the position, and the side that doubles rooks on it first controls the game.
- 2The central tension is the key decision: releasing it too early hands the opponent a free tempo and a target, so keep it until a capture wins a file, a diagonal or a clear structural edge.
- 3Watch the pawn breaks — both yours and your opponent's. In these structures the player who times the central break better usually wins the game.
Typical middlegame structures
The main line leads to a tense centre: the central pawns still face each other, and the timing and manner of the coming exchange shapes the whole middlegame. It leaves the e-file open — that is where the rooks belong and where the middlegame is decided.
Traps & tactical motifs
Every sharp opening has its traps — study the forcing lines around the centre and the f7/f2 squares before playing this in rated games.
Watch the typical motifs: pins against the pinned piece, knight forks after the natural captures, and queen sorties to a2/g2-style squares.
How to Play Against the French, Tarrasch 3...c5 4.exd5
- Do not let White monopolise the e-file — get a rook there first, because the only open line in the position is worth more than any small material or space edge.
- As Black, resolve the central tension on your terms: force the exchange that gives you the better structure rather than letting the opponent choose the moment.
Study plan & who it's for
Solidly intermediate. The main lines require real study, but the payoff is positions you can play for a lifetime. Best investment for White players around 1400–2000.
Play through the main line above until the piece setup feels natural.
Learn the two or three critical pawn breaks for both sides.
Drill one variation at a time — always connecting moves to plans.