Zukertort Opening

Template:Short description The Zukertort Opening is a chess opening named after Johannes Zukertort that begins with the move:

1. Nf3

Sometimes the name "Réti Opening" is used for the opening move 1.Nf3, although most sources define the Réti more narrowly as the sequence 1.Nf3 d5 2.c4. This is partially because most other common lines transpose to another opening.

A flank opening, it is the third most popular of the twenty legal opening moves White has, behind only 1.e4 and 1.d4.

The move has been described by Edmar Mednis as a "perfect and flexible opening" and by others such as Aron Nimzowitsch as "certainly the most solid move, whereas moves such as 1.e4 and 1.d4 are both 'committal' and 'compromising'." The game can transpose into many other openings that usually start with 1.e4, 1.d4, or 1.c4. For example, after 1.Nf3 c5, White can play 2.e4, leading to the mainline Sicilian Defense. Other common transpositions are to various lines of the Queen's Gambit Declined (after e.g. 1.Nf3 d5 2.d4 Nf6 3.c4), the Catalan Opening (after e.g. 1.Nf3 Nf6 2.g3 d5 3.Bg2 e6 4.0-0 Be7 5.c4), or the English Opening.

The main independent lines that usually start with 1.Nf3 are the Réti Opening (1.Nf3 d5 2.c4), the King's Indian Attack (where White plays 1.Nf3, 2.g3, 3.Bg2, 4.e4, 5.d3, and 6.O-O, though not always in that order), and the Nimzowitsch–Larsen Attack (where White plays 1.Nf3, 2.b3, 3.Bb2, and 4.e3, but avoids transposing into an English Opening if c4 were to be played). By playing 1.Nf3, White prevents Black from playing 1...e5, and many players intending to play the English Opening but desiring to avoid the reversed Sicilian lines beginning with 1.c4 e5 opt to start the game with 1.Nf3 instead.

In the Encyclopedia of Chess Openings, Zukertort Openings are classified in the coding series A04–A09. 1...d5 is under A06–A09, 1...Nf6 is under A05, and any other Black move is under A04.

Continuations

The Black responses which are given one or more chapters in the Encyclopedia of Chess Openings are given below, ranked in order of popularity.

1...Nf6

Like White's move, Black's move is non-committal as to opening. 2.d4 is identical to 1.d4 Nf6 2.Nf3 (see Queen's Pawn Game). 2.c4 is a common start for the English Opening or it may be brought back to the Queen's Gambit Declined. 2.g3 is a common start for the King's Indian Attack.

1...d5

Black stakes a claim to the center. White has many transpositional options, such as:

• 2.d4, which is again the same as 1.d4 d5 2.Nf3 (see Queen's Pawn Game).
• 2.g3, which is the King's Indian Attack.
• 2.c4, which is the Reti Opening or English Opening.
• 2.e4, which is the Tennison Gambit.

1...c5

Black invites White to play 2.e4, transitioning into the Sicilian Defense, or 2.c4, the Symmetrical Defense of the English Opening.

1...g6

White can play 2.c4 for the English Opening, 2.e4 for the Sicilian Defense, 2.g3 for the King's Indian Attack, or 2.d4 for the King's Indian Defense.

1...e6

Like White's move, Black's move is non-committal as to opening. White can play 2.c4 for the English Opening or 2.e4 for the French Defense (if Black plays 2...d5) or the Sicilian Defense (if Black plays 2...c5). Another non-committal move for White is 2.d4, which can lead to the Sicilian Defense, the Queen's Gambit Declined, the Dutch Defense, the Indian Defenses, the King's Indian Attack, or the London System, depending on Black's reply.

1...f5

After 1...f5, 2.d4 is the Dutch Defense. 2.e4 borrows ideas from the Staunton Gambit.

See also

• List of chess openings