# Chess Opening Theory/1. d4/1...f5/2. h3
## 2.h3 - Dutch Defence, Korchnoi Attack

The Korchnoi attack is a theory based, sound, aggressive way to play against the Dutch. This Attack has been named after the Russian Grandmaster, Viktor Lvovich Korchnoi.
Viktor Lvovich Korchnoi (Russian: Виктор Львович Корчной, IPA: [vʲiktər lʲvovʲɪtɕ kɐrtɕˈnoj]; 23 March 1931 – 6 June 2016) was a Soviet (before 1976) and Swiss (after 1980) chess grandmaster (GM) and chess writer. He is considered one of the strongest players never to have become World Chess Champion.
Black has to respond differently right from the start. Black strongest responses are:
* for the open variations with 2...d6 3...e5 4...Nc6,
* for the closed variations with 2...d5 3...c5 4...e6,
In both variation in the spirit of the Dutch Defence, black will fight in most sound and aggressive way possible. In the event of the open variations white can go for
* for the classic variation with 3.g6... 4.Bg5... 5.e5...
* for the normal variation with 3.Nf3... 4.c4... 5.Nc3...
* for the modern variation with 3.Nc3... 4.e5 fxe5 5.Nxe5...
In the case of the Dutch Defence, Korchnoi Attack, open Variations there is high probability to castle on opposing sites, which can lead to very exciting positions.

## Theory table

For explanation of theory tables, see theory table and for notation, see algebraic notation.
1. d4 f5 2.h3
| | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Korchnoi Trap | ... Nf6 | g4 fxg4 | hxg4 Nxg4 | Qd3 Nf6 | Rxh7 Rxh7 | Qg6# ... | | | + |
| | ... Nf6 | g4 fxg4 | hxg4 Nxg4 | Qd3 g6 | Rxh7 Rxh7 | Qxg6+ Rf7 | Qxg4 d5 | Qh5 Qd6 | +- |
| Janzen-Korchnoi Gambit accepted | ... Nf6 | g4 fxg4 | hxg4 d5 | g5 Ne4 | ... ... | ... ... | | | +/= |
| Janzen-Korchnoi Gambit accepted Donkey Variation | ... Nf6 | g4 fxg4 | hxg4 d5 | g5 Ne4 | f3 Ng3 | Rh2 Nxf1 | Kxf1 g6 | | -+ |
| Janzen-Korchnoi Gambit declined | ... Nf6 | g4 d5 | hxg4 d5 | g5 Ne4 | Nf3 e6 | Bf4 c5 | e3 Bd6 | Bb5+ Bd7 | -/+ |
| Zmajcic Defense, Paniagua Attack | ... d6 | g4 e5 | dxe5 Nc6 | Nf3 fxg4 | hxg4 Bxg4 | Bg5 Qd7 | exd6 Bxd6 | Bg2 Nf6 | +/= |
| Zmajcic Defense, Takovsky Attack | ... d6 | g4 e5 | Bg2 Nc6 | dxe5 Nxe5 | gxf5 Bxf5 | Bxb7 Rb8 | Bg2 Nf6 | Nc3 Be7 | +/= |
| Zmajcic Defense, Melcer-Szczawiński Attack | ... d6 | g4 e5 | e4 fxe4 | dxe5 Nc6 | Nc3 Be6 | Be3 h5 | Qe2 Qd7 | O-O-O Bxe5 | +/= |
| Zmajcic Defense, Erlang Attack | ... d6 | g4 e5 | d5 c6 | e4 fxe4 | c4 Nf6 | g5 Nfd7 | Nc3 Nc5 | Be3 Nba6 | =/+ |
| Yelizovo Defense, Wians Attack | ... d6 | g4 fxg4 | hxg4 Bxg4 | Qd3 Nf6 | Bg5 c6 | Bxf6 gxf6 | Rxh7 Rxh7 | Qxh7 Qa5+ | +/= |
| Yelizovo Defense, Gerogiannis Attack | ... d6 | g4 fxg4 | e4 e5 | hxg4 exd4 | Qxd4 Nc6 | Qa4 Bxg4 | Nc3 Nf6 | Bg5 a6 | +/= |
| Yelizovo Defense, Feuerstein Attack | ... d6 | g4 fxg4 | Qd3 g3 | fxg3 Nf6 | Bg5 c6 | Nc3 Qa5 | Bxf6 exf6 | Qe3+ Be7 | +/= |
| Yelizovo Defense, Biriukov Attack | ... d6 | g4 fxg4 | Bf4 Nf6 | e3 c5 | Nc3 cxd4 | exd4 g6 | Be2 g3 | Bxg3+ Bh6 | =/+ |
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## References

* Lichess Studies, Dutch Defence, Korchnoi Attack
* Chess.com, Library:
* Gamenot.com, annotated games: Dutch Defence, Korchnoi Attack
* Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. ISBN 1-8574-4221-0.
* Kasparov, Garry, & Keene, Raymond 1989 Batsford chess openings 2. ISBN 0-8050-3409-9.