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1.Nf3 - Practical Repertoire for White

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KID Fianchetto 6.b3 - A Modern Repertoire for White 
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For decades, White players facing the King's Indian Defense have searched for systems that avoid the violent tactical storms Black seeks while maintaining realistic winning chances. GM Alexey Dreev, who has the experience of being a 2700+ super-GM and one of the world's most experienced positional players, has found his answer in the modest-looking 6.b3—a system he has refined throughout his entire career. Together with GM Pier Luigi Basso, he presents a complete repertoire where the double fianchetto becomes not just a solid choice, but a psychological challenge: when White removes the imbalance from the board, King's Indian players must either accept passive positions or pursue counterplay this system is specifically designed to neutralize.

Sequence:  1.d4 According to Dreev  »

4h 42m PGN Available Memory Booster Interactive Tests Computer Practice

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Queen's Gambit Declined for Black - Modern Approach to the Carlsbad 
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The Carlsbad structure has produced some of chess's most instructive positional battles. White methodically advances on the queenside, Black counters with central or kingside activity, and the resulting plans are taught in textbooks worldwide. Yet despite this wealth of understanding, Black players face a persistent challenge: White dictates the narrative. The structure may be equal, but the psychology isn't—White pushes forward while Black searches for the right moment to strike back.
GM Boris Avrukh's latest course rewrites this dynamic entirely. His proposal: stop waiting for White to complete development and then respond to threats. Instead, create threats of your own before White achieves the comfortable setup he's aiming for. The catalyst is 7...Bg4, an aggressive developing move that transforms the opening from a patient positional struggle into an immediate tactical contest where both sides must calculate precisely.

4h 37m PGN Available Memory Booster Interactive Tests

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Play the Catalan - Part 4 
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The Catalan is a positional opening, yet its subtlest battles are decided by a single tempo. When Black plays 4...Bb4+ before retreating the bishop to d6, White's bishop lands on d2 instead of staying on c1. This seemingly modest difference—one extra tempo with an already developed piece—creates a web of tactical and strategic nuances that separate preparation from improvisation. GM Alexey Dreev and GM Pier Luigi Basso's Play the Catalan - Part 4 completes their comprehensive White repertoire by addressing precisely these modern defensive setups that have become the weapon of choice for elite players in recent years.

Sequence:  Catalan According to Dreev  »

3h 37m PGN Available Memory Booster Interactive Tests

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Blumenfeld Gambit - Top-Level Repertoire for Black 
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For decades, 1.d4 Nf6 2.c4 e6 3.Nf3 has been White's most reliable route to a safe, structured game — a move order preferred precisely because it steers clear of chaos. The Blumenfeld Gambit refuses that contract. With 3...c5 4.d5 b5, Black sacrifices a pawn for dynamic central control and immediate counterplay. Employed at the elite level by Aronian, Mamedyarov, and more recently Arjun Erigaisi, it remains one of the least-charted territories in modern opening theory. That obscurity is precisely what makes it dangerous.

3h 13m PGN Available Memory Booster Interactive Tests Computer Practice

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Queen's Gambit Declined for Black - The Concept with 4...Nbd7 
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The Queen's Gambit Declined has always been a fortress of classical chess—solid, principled, and theoretically demanding. But what if you could sidestep the theoretical marathons of the countless variations while maintaining all the strategic richness? GM Szymon Gumularz and GM Pier Luigi Basso propose exactly that: 4...Nbd7, a flexible system that deliberately avoids the main theoretical highways while delivering complex, ambitious middlegames.

2h 58m PGN Available Memory Booster Interactive Tests

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1.d4 Nf6 2.Nf3 g6 3.Nbd2 - According to Felix Blohberger 
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When GM Felix Blohberger began searching for a practical weapon against the Grünfeld and King's Indian Defense, he wasn't looking to compete with mainline theory. Instead, he identified a subtle move order shift that changes the entire character of the position: 1.d4 Nf6 2.Nf3 g6 3.Nbd2. By developing the knight to d2 rather than c3, White sidesteps decades of established theory while maintaining concrete advantages in the resulting structures.

1h 34m PGN Available Memory Booster Interactive Tests

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Carlsbad Structure - Complete Repertoire for Black 
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The repertoire is structured around 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5, meeting White's main continuation 5.Bg5 with the flexible 5...c6. From there, Krishnater maps out responses to every significant White system—from Sarana's 5.Bf4 and Erigaisi's 5.Nf3, to the aggressive 9.Nge2 setup that once troubled Black until modern engines revealed reliable defenses.

3h 5m PGN Available Memory Booster Interactive Tests

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Fight the Catalan - Dynamic Repertoire for Black 
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The Catalan has earned its reputation as one of White's most refined weapons—a setup that squeezes Black positionally without offering clear tactical targets. Traditional responses either accept long-term passivity or aim for quick exchanges that lead to plain equality. The fundamental challenge remains: can Black create genuine winning chances without drifting into positions where White's superior structure and piece placement gradually tell?

GM Mahammad Muradli answers this question with a system that flips the script entirely. His course on 4...dxc4 5.Bg2 Nbd7 presents Black's most principled counterattacking approach—a line that has become the choice of world-class players including Carlsen, Nakamura, and Mamedyarov.

2h 26m PGN Available Memory Booster Interactive Tests

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1.d4 Nf6 2.c4 g6 3.f3 - Top-Level Repertoire for White 
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When top players like Anand began employing 3.f3 against the Grünfeld and King's Indian, they weren't searching for a tactical refutation. They were reclaiming White's most fundamental asset: the ability to establish a classical pawn center without committing to a rigid piece configuration. This flexible approach, systematically explored by IM Kushager Krishnater, offers White a coherent repertoire where strategic clarity replaces the encyclopedic memorization demanded by mainline theory.

3h PGN Available Memory Booster Interactive Tests

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Nimzo-Indian Defense for Black - Part 2 
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When Capablanca introduced 4.Qc2 against the Nimzo-Indian nearly a century ago, he established what would become the Classical Variation—a line respected for its soundness and strategic depth. Yet respect for a variation doesn't mean accepting drawn positions. GM Pier Luigi Basso and GM Szymon Gumularz return with Part 2 of their Nimzo-Indian series, completing what Part 1 began: a fighting repertoire built on elite-level preparation that refuses to surrender the initiative.

Sequence:  Modern Nimzo-Indian Repertoire  »

1h 46m PGN Available Memory Booster Interactive Tests

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