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| Moves | 1.Nc3 | ||||||||||||||||||||||||||||||||||||||||||||
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| ECO | A00 | ||||||||||||||||||||||||||||||||||||||||||||
| Origin | Blackburne–Noa, London 1883 | ||||||||||||||||||||||||||||||||||||||||||||
| Named after | Ted A. Dunst | ||||||||||||||||||||||||||||||||||||||||||||
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TheDunst Opening is achess opening in which White opens with the move:
This fairly uncommon opening may have more names than any other: it is also called theHeinrichsen Opening,Baltic Opening,Van Geet Opening,Sleipnir Opening,Kotrč's Opening,Meštrović Opening,Romanian Opening,Queen's Knight Attack,Queen's Knight Opening,Millard's Opening,Knight on the Left, and (in German)der Linksspringer.
The names Heinrichsen and Baltic derive fromLithuanian chess playerArved Heinrichsen (1879–1900). The opening was analyzed and played by theNew York master Ted A. Dunst (1907–1985), giving the opening its most popular name in the United States. The DutchInternational Master andcorrespondencegrandmaster Dirk Daniel ("Dick D.") van Geet (1932–2012) frequently played 1.Nc3, so it is often called the Van Geet Opening in theNetherlands. The appellationSleipnir seems to come fromGermany. Sleipnir isOdin's (Wotan in German) magical eight-legged horse, and chessknights are horses with up to eight different possible moves each turn.CzechJan Kotrč (1862–1943), editor and publisher of the magazineČeské Listy, said the opening was analyzed byEnglish players. Zvonimir Meštrović (b. 1944) is aSlovenian International Master who often adopts this opening.Tim Harding refers to it as the "Queen's Knight Attack" (Harding 1974:8).National MasterHugh Myers called it "Millard's Opening" after Henry Millard (1824–1891), a blindcorrespondence chess player who drew with the opening in asimultaneous exhibition againstJoseph Henry Blackburne. Blackburne later played the opening himself againstJosef Noa in the London 1883 international chess tournament (Myers 2002:24–25).[1] The GermanFIDE Master Harald Keilhack in his 2005 book on the opening states that it has also been referred to as the Romanian Defense, and that he prefers the neutral appellation "Der Linksspringer" or, in English, "the Knight on the Left" (Keilhack 2005:7).
The opening move 1.Nc3 develops theknight to a good square where it attacks the central e4 and d5 squares. Although quite playable, 1.Nc3 is rarely seen; it is only the eighth most popular of the 20 possible first moves, behind 1.e4, 1.d4, 1.Nf3, 1.c4, 1.g3, 1.f4, and 1.b3. As of February 6, 2009, out of the over 500,000 games inChessGames.com's database, only 644—about 1 out of every 780—begins with 1.Nc3.[2] The third-ranking 1.Nf3 is 66 times as popular.[2] Some very strongcorrespondence chess players employ 1.Nc3 frequently, and it is occasionally seen over-the-board.
The reasons for 1.Nc3's lack of popularity are that it does not stop Black from occupying the center (while 1.Nf3 prevents 1...e5, 1.Nc3 does not prevent 1...d5 because the d-pawn is guarded by the queen), and it blocks White's c-pawn from moving, thus making it impossible to play c3 or c4 (which are often desirable moves) without moving the knight first. In addition, after 1...d5, the knight's position is unstable because Black may attack it with ...d4. Although 1.Nc3 develops a piece to a good square (unlike 1.Na3 or 1.Nh3), and does not weaken White's position (unlike, e.g., 1.g4 or 1.f3) or waste time (unlike, e.g., 1. c3), the above-stated drawbacks make it an inferior way of attempting to exploit White'sfirst-move advantage. Of the 644 games with 1.Nc3 inChessGames.com's database, White won 34.8%, drew 23.9%, and lost 41.3%, for a total winning percentage of only 46.75%.[2][3] White scores much better with the more popular 1.e4 (54.25%), 1.d4 (55.95%), 1.Nf3 (55.8%), 1.c4 (56.3%), and 1.g3 (55.8%).[2] However, as of October 2018, for the 38,043 games with 1.Nc3 inLichess.org's database, White has a total winning percentage of 57.25% (55% won, 5% drawn, 40% lost), although it is still only the tenth most popular first move for White. Interestingly as a testament to Nc3 as an interesting move choice to simplify opening theory yet being effective: After 1.e4 d5 the usual 2.exd5 is 48% win rate for White whilst 2.Nc3 has a 49% win rate as of 30 July 2022 - albeit with less sample size but still over 300,000 games. This could arise from the mainline of this article from 1.Nc3 d5 2.e4 which shows in fact the Dunst system is actually being regularly used online with great effect.
This is one of Black's best replies, occupying the center and undermining the unsettled position of White's knight. White can prevent 2...d4 by playing 2.d4 themselves, transposing to a well-known position in theQueen's Pawn Game, where after 2...Nf6 white can choose to play a Jobava London system with 3.Bf4, a Veresov attack with 3.Bg5 or he may transpose to the Blackmar-Deimer Gambit with 3.e4?!.
Also possible is 2.Nf3 (and if 2...d4, 3.Ne4), a sort ofBlack Knights' Tango with an extra move (Harding 1974:10).
A third line is 2.e3, which Keilhack calls "the Müller game," when White hopes for 2...e5 (other moves are also playable, of course) 3.Qh5!?, e.g. 3...Nc6 4.Bb5 Qd6 5.d4 exd4 6.exd4 Nf6 7.Qe5+! Be6?! (Keilhack recommends 7...Kd8!! 8.Bxc6 bxc6 9.Nf3 Bg4) 8.Bf4 0-0-0 9.Bxc6 Qxc6? 10.Nb5!, when White wins at least a pawn (Keilhack 2005:307–11).
White's most common response to 1...d5 is 2.e4. This is the same position as 1.e4 d5 2.Nc3, an obscure branch of theScandinavian Defense. Black has five plausible responses to 2.e4: 2...e6 and 2...c6 transpose to theFrench andCaro–Kann Defenses, and 2...Nf6 to a variation ofAlekhine's Defence. The move 2...d4 gives Black aspatial advantage, which White may work to undermine along the lines ofhypermodernism. Keilhack writes, "2...d4 is chosen either by somewhat naive players who are attracted by the fact that Black wins time and space ... or by strong players who are aware of the strategic risks but are striving for a complex battle." (Keilhack 2005:44) He considers the Van Geet Attack, 2...d4 3.Nce2 followed by 4.Ng3, to be "the core of the 1.Nc3 opening," "a fully independent entity which strives for early knight activity on the kingside," usually with Ng3, Nf3, Bc4 or Bb5, 0-0, and d3 (Keilhack 2005:44). Alternative lines for White include the unusual 3.Nb1!?, with which van Geet once drewSpassky, and, after 3.Nce2, playing a sort ofKing's Indian Attack with d3, g3, Bg2, f4, Nf3, and 0-0 – a line Keilhack calls the "Lizard Attack" (Keilhack 2005:125).
The fifth alternative, 1...d5 2.e4 dxe4, leads to more open play. After 3.Nxe4, Black has a number of playable moves, including 3...e5, 3...Nc6, 3...Bf5, 3...Nd7, 3...Nf6, and even 3...Qd5!?, when 4.Nc3 transposes to theScandinavian Defense (Keilhack 2005:131, 144, 146, 158, 172, 176). After 3...e5, White's thematic move is 4.Bc4, when several of Black's plausible moves lead to disaster, e.g. 4...Be7? 5.Qh5! and White wins at least a pawn after 5...g6 6.Qxe5 or 5...Nh6 6.d3; or 4...Nf6? 5.Ng5! Nd5 and now 6.d4!, 6.Qf3!, and 6.Nxf7!? Kxf7 7.Qf3+ are all possible, with positions similar to the line of theTwo Knights Defense beginning 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5?! (Keilhack 2005:133–34). However, 3...e5 4.Bc4 Nc6! is playable (Keilhack 2005:135–43).
International Master Richard Palliser, in his 2006 bookBeating Unusual Chess Openings, recommends 1...d5 2.e4 dxe4 3.Nxe4 Nd7 for Black. He explains, "Black doesn't attempt to refute White's opening or to gain lots of space (as with 2...d4), but simply settles for sensible development. The position should be compared to both aCaro-Kann Defense and a French Rubinstein. Black will hope to demonstrate that he has gained from the omission of an early ...c6 or ...e6, while White will generally omit d4, preferring a setup with Bc4 and d3" (Palliser 2006:143). After 4.Bc4, the natural move 4...Ngf6!? leads to very sharp and unclear play if White responds with 5.Bxf7+!? Kxf7 6.Ng5+ Kg8 7.Ne6 Qe8 8.Nxc7 (Keilhack 2005:158–63) (Palliser 2006:144–46). More solid is 4...e6 ("!" – Keilhack) (Keilhack 2005:164–70) (Palliser 2006:144–48).
1...c5 is often played by devotees of theSicilian Defence, into which the game often transposes, either immediately after 2.e4 or at a later point. Alternatively, White can remain in independent 1.Nc3 lines, at least for the time being, with 2.Nf3 followed by 3.d4, which gives Black a large choice of possible responses. One line Palliser recommends for Black is 2.Nf3 Nf6 3.d4 (3.e4 transposes to a Sicilian) cxd4 4.Nxd4 d5!? (seizing the center) 5.Bg5 Nbd7! 6.e4 (more critical than the passive 6.e3?!) dxe4 7.Qe2 e6!? 8.0-0-0 Be7 9.Nxe4 0-0 when "White doesn't appear to have any advantage" (Palliser 2006:154–56).
If White chooses to transpose to standard Sicilian lines, the fact that his knight is committed to c3 may be a disadvantage in certain lines. The Closed Sicilian, commonly reached by 1.e4 c5 2.Nc3, without an early d4 by White, gives Black fewtheoretical difficulties (de Firmian 2008:346). If White instead chooses to play an Open Sicilian with 2.e4 and 3.Nf3 or Nge2, followed by d4, the knight's placement on c3 prevents White from playing theMaróczy Bind with c4. This makes theAccelerated Dragon Variation with 2...Nc6 and 3...g6 particularly attractive (Gallagher 1994:146). Black may also stop White's intended d4 by playing an early ...e5, e.g. 1.Nc3 c5 2.e4 Nc6 3.Nf3 e5 (Gallagher 1994:151–55) or 3.Nge2 e5 (Gallagher 1994:148–51).
GrandmasterLarry Kaufman recommends 1...Nf6, intending to meet 2.e4 with 2...e5 or 2.d4 with 2...d5 (Kaufman 2004:484). Keilhack writes that "1...Nf6 is one of the most unpleasant replies for the 1.Nc3 player. Black keeps all options open, he can choose between a central (...d5, possibly followed by ...c5) and an Indian (...g6, ...Bg7) setup. ... Among the many possible [second] moves [for White], none really stands out." (Keilhack 2005:338). The most straightforward moves for White are 2.d4 and 2.e4, but neither promises White a significant advantage. After 2.d4, 2...d5 leads to theRichter-Veresov Attack (3.Bg5) or another type ofQueen's Pawn Game such as a Jobava London System, where White, having blocked his c-pawn, has little chance for an advantage (Kaufman 2004:469, 473). After 2.e4, Black can again play 2...d5 with a variation of the Alekhine's Defense; or 2...d6 3.d4 g6 with aPirc Defense or 3...e5 with aPhilidor's Defense. The most solid response to 2.e4 is 2...e5, leading to aVienna Game or, after 3.Nf3 Nc6, to aFour Knights Game—neither of which offers White an appreciable advantage (Kaufman 2004:364–65) (de Firmian 2008:121). Keilhack also analyzes a number of offbeat possibilities, including 2.b3, 2.Nf3, 2.f4 (an unusual form ofBird's Opening that Keilhack calls the "Aasum System"), 2.g3, and even the gambit 2.g4?! Palliser writes that none of the alternatives to 2.e4 "really convince or should greatly trouble Black over the board" (Palliser 2006:142).
This natural move is probably playable, but already a slight inaccuracy as White maintains an opening advantage in all lines. It is also particularly dangerous if Black does not know what he is doing, with numerous traps and knight tactics which Black must avoid. One of the main lines is 1...e5 2.Nf3 Nc6 3.d4, known as the Napoleon Attack, with poor chances for Black, continued by 3...exd4 4.Nxd4 Nf6 5.Bg5. Keilhack writes that this variation "occurs rather often and offers excellent chances for an early knockout" by White and that "only two [moves] (5...Bb4 and 5...Bc5) do not immediately ruin Black's game" (Keilhack 2005:26). (See, e.g., the Dunst–Gresser game given below.)
Additionally, White can opt to immediately transpose into mainstream opening territory with 2.e4, leading the game intoKing's Pawn Openings such as theVienna Game, orFour Knights Game, however, it is thought that 2.Nf3 followed by 3.d4 is White's best chance of gaining an advantage out of the opening.
The move 1.Nc3 is considered anirregular opening, so it is classified under the A00 code in theEncyclopaedia of Chess Openings (also seeList of chess openings).Transpositions to more common openings are possible, many of which are discussed in the preceding section. In addition, 1.Nc3 d5 2.e4 reaches a position in the Scandinavian Defense; 1.Nc3 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.e4 leads to aScotch Four Knights Game; 1.Nc3 e5 2.Nf3 Nc6 3.e4 Bc5 or 3...g6 gives aThree Knights Game; 1.Nc3 Nc6 2.d4 d5 3.e4, or 2...e5 and now 3.d5 Nce7 4.e4 or 3.dxe5 Nxe5 4.e4, yields aNimzowitsch Defense; and 1.Nc3 b6 2.e4 Bb7 3.d4 is anOwen's Defense. Transposition to aDutch Defense is also possible after 1.Nc3 f5 2.d4, but Keilhack considers 2.e4! more dangerous, intending 2...fxe4 3.d3, a reversedFrom's Gambit (Keilhack 2005:369–70). Black alternatives to 2...fxe4 include 2...d6, when 3.d4 transposes to theBalogh Defense; and 2...e5?!, when 3.Nf3 produces aLatvian Gambit, but 3.exf5!, as in a game betweenSteinitz andSam Loyd, may be stronger.[4]
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