Vol.13 Ch.1: QGA Classical & Normal (3. Nf3) · Vol.13 Ch.2: QGA Central & Accelerated (3. e4) · Vol.13 Ch.3: Tarrasch Defense (3...c5) · Vol.13 Ch.4: Semi-Tarrasch Defense (4...c5)
Queen's Gambit Accepted & Tarrasch: Semi-Tarrasch Defense (4...c5) (D40)
ECO D40 · Vol.13 · Ch.4 · 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O
Queen's Gambit Accepted & Tarrasch: Semi-Tarrasch Defense (4...c5) (D40) — arising after 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O (canonical ECO D40, Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation) — forms Chapter 4 of Volume 13 (Queen's Gambit Accepted & Tarrasch) in the ChessMinds Opening Codex, encompassing 22 established variations across 4 progressive training stages. After 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O, focus on central square control and active piece coordination rather than rote memorization—this D40 structure rewards clear pawn-break timing.
Historical Origins & Pawn-Structure DNA
16th-Century Stamma & Siegbert Tarrasch's Classical Dogma ('Praeceptor Germaniae') · Open CenterPiece Play (QGA) & Isolated Queen's Pawn (IQP d4/d5) · Siegbert Tarrasch, Boris Spassky, Garry Kasparov, Vishy Anand
Dr. Siegbert Tarrasch famously championed 3...c5 on principle, arguing that unhindered piece mobility far outweighs the structural blemish of an isolated d5 pawn—a philosophical debate with Nimzowitsch and Rubinstein that still defines chess strategy today.
In the QGA, Black never clings greedily to c4 (avoiding ...b5? traps), instead returning the pawn cleanly while striking back with ...c5; in Tarrasch IQP positions, one side wields the d-pawn as a springboard for e5/d4 breakthroughs while the opponent blockades the square directly in front of it.
白番の戦略ブループリント
- In QGA lines, reclaim the c4-pawn smoothly while seizing central control with e3/e4 and Bxc4.
- Against the Tarrasch (...c5), saddle Black with an Isolated Queen's Pawn on d5 and firmly blockade d4!
黒番のカウンタープレイとブレイク
- In the QGA, DO NOT try to hold the c4-pawn with ...b5?!—develop rapidly and strike back with ...c5!
- In the Tarrasch, use the active piece play and e4/c4 outposts granted by your d5 IQP to generate kingside pressure.
主要 ECO サブバリエーション
- D40 Queen's Gambit Declined: Semi-Tarrasch Defense:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 - D41 Queen's Gambit Declined: Semi-Tarrasch Defense:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 - D42 Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3 - D41 Queen's Gambit Declined: Semi-Tarrasch Defense:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. g3 - D41 Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e4 - D41 Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation:
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3
FAQ
What are the starting moves and ECO code of Semi-Tarrasch Defense (4...c5)?
Semi-Tarrasch Defense (4...c5) carries international ECO code D40 (Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation) and reaches its thematic branching position after 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O.
Is Semi-Tarrasch Defense (4...c5) (D40) suitable for club and rapid tournament players?
Yes. With 22 structured ECO variations and an objective assessment around +0.22, it offers crystal-clear piece plans and thematic pawn breaks for White.
How can I drill all 22 lines of Semi-Tarrasch Defense (4...c5) offline?
Open ChessMinds -> Labs -> Opening Codex -> Vol.13 Chapter 4. Clear the 4 progressive stages in free 2-Star Practice Mode (0 Focus Hearts), then unlock the 10s/move Blindfold Trial for 3 Stars.