Classical theory treated an early rook-pawn move as a small concession — a tempo spent on nothing while the real pieces waited. The engine age has quietly overturned that verdict. Again and again, a flexible waiting move has proven worth more than a routine developing one, and today's practice is full of early …h6 and …a6 ideas an older generation would have dismissed as slow.
4…h6 in the Queen's Gambit Declined is a clean expression of that shift. After 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 h6, Black spends a move to deny White the g5-square — and with it, the whole theoretical forest that grows around the Bg5 pin.
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2h 37m PGN Download Memory Booster Interactive Tests
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There is no shortage of repertoires against the London System. What there has never been is seven of them, side by side, produced independently by strong players who did not know what the others were writing.
That is what the Modern Chess Autumn Challenge produces, and this database is the result of its first stage. Each of the seven participants was handed the same two problems — a repertoire for Black against the Classical London (1.d4 d5 2.Nf3 Nf6 3.Bf4) and against the Jobava London (1.d4 d5 2.Nc3 Nf6 3.Bf4) — and each solved them their own way.
Fourteen recommendations. No two alike.
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4h 43m PGN Download
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When the strongest players in the world want a defense to 1.d4 that holds up under preparation, they keep returning to the Semi-Slav. Kramnik built much of his elite career around it, Anand leaned on it through a World Championship match, and Carlsen has reached for it across dozens of games. It has earned its reputation as one of the most reliable answers to the Queen's Gambit — solid enough to trust, yet rich enough to play for a win.
In his new course, GM Harshit Raja sets out to package that heritage into something you can keep for life: a complete, top-level repertoire built around 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6. The goal he states from the start is a lifetime repertoire — one set of answers, studied once and trusted for the rest of your career, rather than a collection of lines you patch and replace season to season.
Sequence: Semi-Slav Defense According to Raja Harshit »
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2h 48m PGN Download Memory Booster Interactive Tests Computer Practice
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Few openings demand as much theory as the Semi-Slav. Its sharpest lines are long and forcing, where a single forgotten move can decide the game before it has really started.
But theory always runs out. Sooner or later the forcing sequence closes, both players are on their own, and what remains is a structure, a pawn break, and a plan.
That is where most Semi-Slav games are actually decided, and it is the subject of GM Harshit Raja's new course, Semi-Slav Strategy: Structures, Breaks & Counterplay.
Sequence: Semi-Slav Defense According to Raja Harshit »
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2h 31m PGN Download Interactive Tests
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Few sidelines have reshaped everyday 1.d4 play over the past decade like the Jobava London — 1.d4 Nf6 2.Nc3 followed by 3.Bf4. Baadur Jobava did more than anyone to bring it into serious practice, which makes him an unusually credible guide to taking it apart. Here he does exactly that, showing Black how to defuse a system he understands from the inside.
That gesture sets the tone for the whole course. King's Indian Defense: A Complete Repertoire – Part 6 is the volume where GM Andrea Stella and GM Baadur Jobava turn to everything White plays instead of a real King's Indian — the sidelines designed to sidestep the fight rather than enter it.
Sequence: King's Indian Defense According to Jobava »
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4h 15m PGN Download Memory Booster Interactive Tests
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When a player needs a win with the black pieces against 1.d4, the Modern Benoni has answered that call for the better part of a century. Tal, Fischer, Kasparov, Topalov — the names attached to it read like a roll call of champions who refused to settle for a draw.
What united them was not a taste for risk but an understanding of a bargain. Black hands White a broad pawn center and a space advantage, and takes in return active piece play, lasting pressure down the queenside, and counterplay in the center and on the kingside.
That bargain is the whole idea of the opening, and it is where this course takes its name. Counterplay Without Compromise describes a defense that concedes something real about the structure without ever conceding the initiative.
Sequence: Korobov's Modern Benoni »
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4h 22m PGN Download Memory Booster Interactive Tests Computer Practice
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In 1918, at Berlin, Milan Vidmar reached for an opening that barely anyone took seriously. It was a pawn sacrifice first tried by the Hungarian master Maróczy in a casual game back in 1896, and Vidmar used it to defeat Akiba Rubinstein — one of the finest technicians the game has ever produced.
That single result pulled the Budapest Gambit out of obscurity and sparked a wave of popularity through the early 1920s. It has been a rare guest at the top ever since.
But the reason Vidmar's idea worked has never gone away. After 1.d4 Nf6 2.c4 e5, Black hands over a pawn and receives, in return, rapid development and pieces that come to life at once.
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3h 22m PGN Download Memory Booster Interactive Tests
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The Modern Benoni was not understood in a single generation. Its defining imbalance — Black concedes space and a central pawn majority to White, and takes in return a queenside majority of his own, active pieces, and the ...b5 and ...f5 breaks — took the chess world decades of practical play to read correctly. That slow accumulation of understanding is exactly what GM Anton Korobov sets out to compress into one training course.
The subtitle is not decoration. Everything in the Benoni flows from a deliberate structural bargain, and the player who grasps that bargain — when the imbalance favours them, and how to convert it — is the player who scores. Theory tells you which moves to make; this course is about the positions those moves produce.
Sequence: Korobov's Modern Benoni »
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4h 37m PGN Download Interactive Tests
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Not every Catalan player wants a theoretical duel. Many sidestep the sharpest main lines at move six, hoping a quieter set-up will hand them a small, nagging edge without a lot of memorization. Fighting the Catalan: A Complete Repertoire for Black – Part 2, by GM Michael Roiz and GM Petar Arnaudov, answers that hope with a single recurring counterpunch: the timely ...c5, striking at White's centre while his development still lags.
Where Part 1 covered the main lines after 6.O-O dxc4, Part 2 takes on everything else — the queen sorties, the early bishop developments, and the knight tours White uses to avoid the main paths. The unifying message is that none of these deviations changes Black's plan. Whatever White tries at move six, the central break is waiting.
Sequence: Roiz versus the Catalan »
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42m PGN Download Memory Booster Interactive Tests
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There is a kind of move a Slav player learns to dread — 4.g3, 4.Qc2, 4.Qb3, 4.Nbd2 — whose whole purpose is to avoid a theoretical debate rather than win one. White keeps the tension low, sidesteps the heavy theory, and hopes a small pull quietly does the work.
These systems are popular because they are easy for White and awkward for Black to meet without drifting into a slightly worse, passive game. This course takes them seriously, treating each as a battleground that deserves a concrete answer — and giving Black two of them.
Sequence: Malakhov's Slav Defense »
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5h 3m PGN Download Memory Booster Interactive Tests
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