Nimzo-Indian Three Knights Variation: 4.Nf3 Kasparov System

The Nimzo-Indian Three Knights Variation begins with 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3. White develops the third knight naturally before choosing between g3, Bg5, e3 and other systems. Start with the Three Knights Start diagram to see the defining move.

Yes, 4.Nf3 is often called the Kasparov Variation as well as the Three Knights Variation. Three Knights is the clearest descriptive name, while Kasparov highlights the famous World Championship model games. Use the Branch Map to keep both names connected on this page.

The earliest clean move order is 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3. The move 4.Nf3 is what separates this line from Rubinstein 4.e3, Classical 4.Qc2 and Sämisch 4.a3. Use the Three Knights Start diagram as the anchor.

White plays 4.Nf3 to develop smoothly and avoid committing the pawn structure or queen too early. The move supports d4 and e5 control while leaving several transpositional paths available. Use the Three Knights Adviser with the focus set to starting idea.

Black tries to challenge White before the flexible setup becomes comfortable. The main tools are ...c5, ...Ne4, ...d5, ...O-O and pressure on c3 or d4. Compare the ...Ne4 and ...Qa5 diagram with the g3 Catalan-Style Setup diagram.

Three Knights is the best main label because it describes the 4.Nf3 move clearly and matches opening taxonomy. Kasparov Variation should still be included because many players recognise the line through his games against Karpov. Use the page title and H1, which include both names.

White's main plan is to develop naturally and only then choose the correct pawn structure. The most common strategic routes are g3, Bg2 and Qb3 pressure, or Bg5 with central tension. Use the g3 Catalan-Style Setup and Bg5 Three Knights diagrams.

White plays g3 to create Catalan-style pressure on the long diagonal. This setup can make Black's queenside and d5-pawn structure feel uncomfortable if White completes development smoothly. Use the g3 Catalan-Style Setup diagram.

White plays Bg5 to develop actively and increase pressure on the f6-knight and centre. This route appears in several Kasparov-Karpov model games and can lead to concrete central tactics. Use the Bg5 Three Knights diagram.

White uses Qb3 when pressuring d5 and b7 is more important than keeping the queen at home. The queen move is especially common in modern g3 systems after exchanges on d5. Use the Modern Qb3 Pressure diagram.

4.Nf3 is usually more flexible and less structurally committal than 4.a3. The Sämisch 4.a3 accepts doubled c-pawns quickly, while Three Knights keeps more options open. Use the Branch Map to compare this page with the Sämisch page.

4.Nf3 is less queen-committal than 4.Qc2, but it allows Black different active systems. Classical 4.Qc2 directly fights for the bishop pair without doubled pawns, while Three Knights develops first. Use the Branch Map to compare this page with the Classical page.

White should avoid playing too casually just because 4.Nf3 looks natural. Black's ...Ne4, ...Qa5 and ...c5 ideas can become tactical if White loses time. Use the ...Ne4 and ...Qa5 diagram.

Black often replies with 4...c5 or 4...O-O, depending on the structure desired. The ...c5 lines immediately question the centre, while ...O-O keeps more flexibility. Use the g3 Catalan-Style Setup and Bg5 Three Knights diagrams.

The point of ...Ne4 is to use the b4-pin and central pressure before White completes development. It can force awkward queen moves and tactical decisions. Use the ...Ne4 and ...Qa5 diagram.

Black plays ...Qa5 to increase pressure on c3 and make White's queen-side coordination less comfortable. In some lines it supports tactical ideas after ...Ne4. Use the ...Ne4 and ...Qa5 diagram.

Black usually meets the g3 setup by striking the centre with ...c5, exchanging on d4 and deciding whether to play ...d5 or ...Ne4. If Black waits too long, White's Catalan-style bishop can dominate the long diagonal. Use the g3 Catalan-Style Setup diagram.

Black can meet Bg5 with ...c5, ...h6, ...d5 and central tension. The key is not to let White build pressure without forcing a structural decision. Use the Kasparov-Karpov 1985 Model diagram.

Black can play for a win because the line is flexible rather than drawish. The supplied games include active Black wins by players such as Carlsen, Aronian, Anand and Ivanchuk. Use the Modern elite replay group.

Black should avoid drifting into passive development while White reaches a pleasant Catalan-style setup. The line rewards timely central challenges and active piece placement. Use the Three Knights Adviser with side set to Black.

Start with Kasparov-Karpov, Moscow 1985, game 11, because it shows the famous Kasparov treatment with Bg5 and central pressure. The game explains why the variation carries the Kasparov name. Use the Kasparov-Karpov replay group.

Kasparov-Karpov 1985 game 1 and the later Bacrot, Topalov and Grischuk examples are useful g3 models. They show how Catalan-style pressure can appear inside the Nimzo-Indian. Use the 4.Nf3 with g3 replay group.

Jakovenko-Carlsen, Moscow 2007, is a strong model for Black counterplay. Carlsen shows active central and kingside play after the modern Qb3 structure. Use the Modern elite Three Knights replay group.

The supplied set includes several Kasparov-Karpov World Championship games from 1985 and 1986. Those games are the historical backbone of the Kasparov Variation name. Use the Kasparov-Karpov World Championship replay group.

The Three Knights Replay Lab uses 23 supplied 4.Nf3 PGNs. They are grouped by Kasparov-Karpov models, g3 Catalan-style systems, Bg5 systems, ...c5 and ...Ne4 pressure, and modern elite games. Use one optgroup at a time in the Replay Lab.

Study Three Knights before Rubinstein if you prefer natural development and transpositional flexibility. Study Rubinstein first if you want to understand the 4.e3 structure before allowing g3 or Bg5 branches. Use the Branch Map to move between both pages.

Study Three Knights before Classical if you want to avoid early queen commitment. Study Classical first if your main question is how to keep the bishop pair without doubled c-pawns. Use the Branch Map to compare this page with the Classical page.

The Three Knights Variation is good for club players who want a flexible Nimzo answer without learning one forcing structure immediately. The danger is drifting without understanding Black's central breaks. Use the Position Trainer before memorising long lines.

White should study the 4.Nf3 start, then one g3 setup and one Bg5 setup. Those two branches explain most practical decisions and many of the model games. Use the first four diagrams in order.

Black should study ...c5, ...Ne4 and one answer to the g3 Catalan-style setup. Those choices stop White from getting a comfortable flexible game for free. Use the ...Ne4 and ...Qa5 trainer position.

After this page, compare Rubinstein 4.e3, Classical 4.Qc2 and Sämisch 4.a3. Those pages show how White can choose structure, queen activity or bishop-pair imbalance on move four. Use the Branch Map links as the Nimzo zoom-in path expands.