9/13/2025 – GM Felix Blohberger takes the road less traveled with his two-part video course on the Réti Opening. In nearly eight hours of material, he explains the ideas he has developed for the Réti – drawing on his own practical experience. Hannes Langrock, an International Master and literary editor at a fiction publishing house, lives in Leipzig and plays for ESV Nickelhütte-Aue. He took an in-depth look at the course and now shares his impressions. | Photos: ChessBase
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In this course, Grandmaster Felix Blohberger delivers a complete opening repertoire for White, centred around the flexible move 1.Nf3.
Looking for a versatile and strategic opening repertoire that doesn’t rely on memorising endless variations? In this course, Grandmaster Felix Blohberger delivers a complete opening repertoire for White, centred around the flexible move 1.Nf3. Whether you’re a club player or a seasoned competitor, this course offers a solid yet dynamic approach that adapts to various playing styles and opponents.
Video sample: Introduction
Video sample: Grunfeld - Sidelines
Why memorising endless theory might not be the best path - and how an idea-based repertoire can change your game.
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At the beginning of the year, a YouTube video by Felix Blohberger went viral, in which the young Austrian grandmaster reflected on the challenges of making a living as a chess professional in Europe. A few months after watching this remarkable and thought-provoking video, I noticed that Blohberger had recorded a two-part 1.Nf3 repertoire for ChessBase. My interest was immediately piqued—especially since I had only recently added the Réti to my own White repertoire.
Volume 1
The first part of the course deals with fianchetto systems—that is, Black setups resembling the King’s Indian, Queen’s Indian, Hedgehog, or Grünfeld.
In his recommendations, however, Blohberger tends to rely on strategically grounded surprise weapons rather than following the absolute mainstream. To illustrate this, here are a few highlights from his choice of variations:
The Reti Opening Powerbook 2025 has a tree structure based on a mixture of over 295,000 computer chess games, played in the engine room of playchess.com and the best games played by humans (137,000). The Reti Opening Powerbook was based on an average of at least 2300 games. This means that 137,000 games from Mega and correspondence chess exceeded the Powerbook's entry threshold, plus 295,000 games from the playchess.com engine room. The original move order a la Richard Reti is 1.Nf3 d5 2.c4 followed by a fianchetto with g3 or b3 (or even the double fianchetto), but nowadays the term Reti opening is much broader and includes almost all possible variations after 1.Nf3 that do not go directly into well-known ‘grand’ openings. One plays 2.g3 (sometimes also 2.b3) more flexibly, usually followed by 3.Bg2 and 4.0-0. Depending on Black's set-up, one then decides how to proceed. The Reti-Powerbook includes as many game openings as possible after 1.Nf3, but no variations with early d2-d4, which would lead to the Catalan or King's Indian, for example. )
Reti Opening Powerbase 2025 is a database and contains 10989 high-class games from the Mega 2025 or the Correspondence Database 2024, 1069 of which are annotated. The 1069 selected annotated games provide excellent study material. Top players such as Carlsen (1 annotated game), Anand (2), Anton Guijarro (1), Aronian (1), Duda (1), Eljanov (1), Firouzja (2), Giri (6), Kramnik (4), Navara (2), Nepomniachtchi (1), Praggnanandhaa (1), Radjabov (1), So (2), Vidit (3), Wojtaszek (1) have analysed their games, plus the comments of Reti experts such as Ribli (181), Horn (140) and Marin (101). In total there are 10989 games, whereby the rating average is at least 2615, except for games with commentaries or by the Reti experts Hikaru Nakamura (1034) and Rasmus Svane (832) as well as Vladimir Kramnik (310).
Re1 against the King's Indian
1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.0-0 0-0 5.d4 d6 and now 6.Re1!?
This modest-looking rook move appears in only about 7 percent of games. White’s idea is to follow up quickly with e2–e4. More importantly, by holding back c2–c4, White makes it difficult for Black to achieve the typical King’s Indian counterplay. Most often Black continues with 6…Nbd7 7.e4 e5, but after 8.Nc3 the game can suddenly transpose into somewhat unfamiliar Old Indian structures.
"I was surprised myself at how good White’s position already is here," explains the Austrian national player, before demonstrating how Black can be faced with serious problems.
Here 7.Re1 is in fact a well-known line and the second most common move. If Black insists on the Hedgehog, then after 7…d6 8.e4 a6 9.d4 cxd4 10.Nxd4 Qc7 11.Be3 Nbd7 12.Rc1 0-0 13.f4 the game tends to head into a dangerous version, where White can combine play with g3–g4 to build up an initiative on the kingside. Of course, Blohberger also covers Black’s attempts to sidestep this scenario with 7…d5 or 7…Ne4.
Against the Queen’s Indian setup and against the double fianchetto with …b6 and …g6, Blohberger likewise relies on an early Re1 with the idea of e2–e4. The Austrian grandmaster has in mind the practical needs of his students—after all, it is much easier to internalize similar structures than to have to memorize something different against every system.
The ultra-solid Symmetrical Grünfeld is a tough nut to crack, so it’s essential to have something up your sleeve here. According to my database, the move recommended by Blohberger, 7.a4!?, which I hadn’t even heard of before watching the course, appears in only about 2 percent of games! Blohberger points out that this poisonous sideline has already made its way into top-level play, but at the amateur level it can certainly catch many opponents by surprise.
The advance of the rook pawn is, on the one hand, prophylaxis against an immediate …dxc4—after 7…dxc4?! 8.Na3, the push 8…b5? wouldn’t work with the pawn already on a4, and otherwise Black also struggles to defend the c4 pawn. On the other hand, a4–a5 can itself become an option. And in many variations, if Black eventually captures on c4, White can simply play for compensation with a strong center after f4, e4, and so on.
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The second part of the Réti repertoire deals with a range of further main systems such as 1.Nf3 c5, the "classical" setups with …d5, …Nf6, …e6, …Be7, the formation with …d5 and …c5, and much more. The large complex 1.Nf3 d5 2.g3 with Black developing the bishop to g4 or f5, as well as modern sidelines like 2…Nbd7 and 2…b6, is also covered in depth.
Blohberger remains true to his approach of avoiding highly theoretical battles. A key cornerstone of the repertoire is the flexible double fianchetto after 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.0-0 Be7 5.c4 0-0 6.b3!?:
A complex that is quite popular at GM level, where the focus is above all on strategic subtleties.
English against 1…c5
An important point for the repertoire is that after 1…c5, White for once does not play 2.g3, but instead 2.c4, transposing into English territory. This is often followed by a quick e2–e3 together with d2–d4, for example after 2…Nc6 3.Nc3 e5 4.e3 or 3…g6 4.e3. In the latter case, 4…Nf6 5.d4 cxd4 6.exd4 d5 7.cxd5 Nxd5 8.Qb3 leads to an Isolani position in which White scores very well—for instance after 8…Nxc3 9.Bc4! Nd5 10.Bxd5 e6 11.Bxc6+ bxc6 12.0-0, with good chances on the dark squares.
Conclusion: In a pleasant presentation style, GM Felix Blohberger offers 7 hours and 30 minutes of video content presenting a promising, strategically based Réti repertoire for White. The Austrian grandmaster’s choice of variations is extremely clever. Rather than following well-trodden mainstream paths and heading into long theoretical duels, he tends to look for ways to pose practical problems. At the same time, there is a certain coherence—for example, the Re1 concept against both the King’s Indian and the Queen’s Indian (or the Hedgehog)—which makes learning easier.
The PGN file provided with the course is a little sparse in some lines—this is because the theory file contains exactly those variations that Blohberger also presents in the videos. From around the 2000+ level, I would recommend analyzing further with the latest Mega Database and an engine, to dig deeper and get the maximum benefit from the course.
About the author
Felix Blohberger is not just a grandmaster—he’s a multiple Austrian national champion and a permanent force on the Austrian national team. Earning his GM title at just 19, Felix brings a wealth of experience both as a competitive player and as a second to top players.
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Hannes LangrockHannes is an International Master and plays for ESV Nickelhütte Aue in the 2nd Bundesliga. He lives with his family in Leipzig and works as a lecturer at a fiction publishing house.
GM Blohberger presents a complete two-part repertoire for Black: practical, clear, and flexible – instead of endless theory, you’ll get straightforward concepts and strategies that are easy to learn and apply.
GM Blohberger presents a complete two-part repertoire for Black: practical, clear, and flexible – instead of endless theory, you’ll get straightforward concepts and strategies that are easy to learn and apply.
GM Blohberger presents a complete two-part repertoire for Black: practical, clear, and flexible – instead of endless theory, you’ll get straightforward concepts and strategies that are easy to learn and apply.
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