|Moves||1.e4 e5 2.Bc4|
|Named after||Bishop in 2.Bc4|
The Bishop's Opening is a chess opening that begins with the moves:
White attacks Black's f7-square and prevents Black from advancing his d-pawn to d5. By ignoring the beginner's maxim "develop knights before bishops", White leaves his f-pawn unblocked, allowing the possibility of playing f2–f4.
The f2–f4 gives the Bishop's Opening an affinity with the King's Gambit and the Vienna Game, two openings that share this characteristic. The Bishop's Opening can transpose into either of these openings, and in particular a favorable variation of the King's Gambit, but with care Black can circumvent this. Transpositions into Giuoco Piano and Two Knights Defense and other openings are also possible.
The Encyclopaedia of Chess Openings (ECO) assigns Bishop's Opening the codes C23 and C24.
|This article uses algebraic notation to describe chess moves.|
History and use
The Bishop's Opening is one of the oldest openings to be analyzed; it was studied by Lucena and Ruy Lopez. Later it was played by Philidor. Larsen was one of the few grandmasters to play it often, after first using it at the 1964 Interzonal Tournament. Although the Bishop's Opening is uncommon today, it has been used occasionally as a surprise by players such as Kasparov. Nunn uses it to avoid Petrov's Defence (1.e4 e5 2.Nf3 Nf6), and Lékó played it in the 2007 World Championship against Kramnik, known to consistently play the Petrov.
Weaver Adams in his classic work "White to Play and Win" claimed that the Bishop's Opening was a win for White by force from the second move. However, he was unable to prove this by defeating players stronger than himself, and later abandoned the Bishop's Opening for the Vienna Game, making the same claim. Grandmaster Nick de Firmian, in the 14th edition of Modern Chess Openings concludes that the Bishop's Opening leads to equality with best play by both sides, and notes that, "Among modern players only Bent Larsen has played it much, but even Kasparov gave it a whirl (winning against Bareev)."
Berlin Defense: 2...Nf6 
Probably Black's most popular second move is 2...Nf6, forcing White to decide how to defend his e-pawn.
After 3.d3 Black must be careful not to drift into an inferior variation of the King's Gambit Declined. One continuation that avoids this pitfall is 3...c6 4.Nf3 d5 5.Bb3 Bd6. Also possible is 3...d6 4.f4 exf4 5.Bxf4 Be6! neutralizing White's king bishop.
White sometimes chooses the Bishop's Opening move order to transpose into the Giuoco Piano while preventing Black from playing Petrov's Defense. For example, 2...Nf6 3.d3 Nc6 4.Nf3 Bc5 reaches the quiet Giuoco Pianissimo.
The Urusov Gambit is named after Russian Prince Sergey Semyonovich Urusov (1827–1897). After 2...Nf6 3.d4 exd4 (3...Nxe4 4.dxe5 gives White some advantage) 4.Nf3, Black can transpose to the Two Knights Defense with 4...Nc6, or can decline the gambit with 4...d5 5.exd5 Bb4+ 6.c3 (6.Kf1 is recommended by Michael Goeller, winning a pawn at the expense of castling rights) 6...Qe7+ 7.Be2 dxc3, when 8.bxc3 and 8.Nxc3 both offer approximately equal chances. Instead, Black can accept the gambit with 4...Nxe4 5.Qxd4 Nf6 (5...Nd6? 6.0-0 gives White an overwhelming attack), and White will continue with Nc3, Bg5, Qh4, 0-0-0, and usually intends to meet ...0-0 and ...h6 with the piece sacrifice Bxh6, exposing the black king. Black has a solid position with no clear weaknesses but White has attacking chances and piece activity as compensation for the pawn. The Urusov Gambit is also occasionally reached via the Petrov Defence after 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.Bc4.
The Boden–Kieseritzky Gambit is named after English player and chess writer Samuel Boden and Lionel Kieseritzky. Boden published the first analysis of it in 1851. Opening theoreticians consider that after 2...Nf6 3.Nf3 Nxe4 4.Nc3 Nxc3 5.dxc3 f6, White's attack is not quite worth a pawn. The game may continue 6.0-0 Nc6 (not 6...Be7? 7.Nxe5! with a tremendous attack, but 6...d6 is also playable) 7.Nh4 g6 8.f4 f5 9.Nf3 (9.Nxf5? d5!) e4 10.Ng5 (10.Ne5 Qe7! threatening Qc5+ is strong) Bc5+. In practice, Black's lack of development and inability to castle can prove very problematic.
Safer for Black are Paul Morphy's solid 5...c6 6.Nxe5 d5, returning the pawn with equality, and 4...Nc6!? (instead of 4...Nxc3) 5.0-0 (5.Nxe4 d5) Nxc3 6.dxc3 Qe7! when, according to Bobby Fischer in My 60 Memorable Games, "White has no compensation for the Pawn."
Black can also decline the pawn with 3...Nc6, transposing into the Two Knights Defense. He must, however, be willing to offer a gambit himself after 4.Ng5. White may invite an offshoot of the Boden–Kieseritzky Gambit with 4.0-0 Nxe4 5.Nc3.
Irregular move orders are 2.Nc3 (Vienna) Nf6 3.Bc4 Nxe4 4.Nf3 and 2.Nf3 Nf6 (Russian or Petrov Defence) 3.Bc4 Nxe4 4.Nf3.
Summary after 2...Nf6
- 3.Nc3 (Vienna Game, by transposition)
- 3.d4 (Ponziani's Gambit)
- 3.Nf3 (Petrov's Defense, by transposition)
- 3...Nxe4 4.Nc3 (Boden–Kieseritzky Gambit)
- 3.f4 (Greco Gambit)
- 3...Nxe4 4.d3 Nd6 5.Bb3 Nc6 or 5...e4
- 3...exf4 (King's Gambit, by transposition)
Classical Defense: 2...Bc5 
The Classical Defense is Black's symmetrical response, 2...Bc5. White can then transpose into the Vienna Game (3.Nc3) or the Giuoco Piano (3.Nf3), or remain in the Bishop's Opening with the Wing Gambit (3.b4) or the Philidor Variation (3.c3). The main line of the Philidor Variation runs: 3.c3 Nf6 4.d4 exd4 5.e5 d5! 6.exf6 dxc4 7.Qh5 0-0 8.Qxc5 Re8+ 9.Ne2 d3 10.Be3. Transpositions into the King's Gambit Declined and the Giuoco Piano are also possible after 3.d3.
Black's most energetic response to the Philidor Variation is the Lewis Countergambit, 3.c3 d5, named for the English player and author William Lewis (1787–1870) who published analysis of the line in 1834.
Among amateurs, 3.Qf3 and 3.Qh5 are also popular, threatening an immediate Scholar's mate. But the threat is easily met (e.g. 3.Qh5 Qe7) and the moves are considered inferior since they hamper White's development or leave the queen exposed, leading to loss of tempo.
Summary after 2...Bc5
- 3.b4 (Wing Gambit)
- 3.c3 (Philidor Variation)
- 3...d5 (Lewis Countergambit)
- 3.Nc3 (Vienna Game, by transposition)
- 3.Nf3 Nc6 (Giuoco Piano, by transposition)
Other Black responses
Other Black second moves are rarely played. If Black tries to transpose into the Hungarian Defense with 2...Be7?, then 3.Qh5 wins a pawn.
The Calabrian Countergambit (2...f5?!) is named after Greco's homeland, Calabria. It is considered dubious, as the line recommended by Carl Jaenisch, 3.d3 Nf6 4.f4 d6 5.Nf3, gives White the advantage.
Summary of other Black responses
- 2...c6 (Philidor Counterattack)
- 2...f5?! (Calabrian Countergambit)
- 3.d3 (Jaenisch Variation)
- Reuben, Stewart (1992). Chess Openings — Your Choice!. Cadogan Chess. p. 59. ISBN 1-85744-070-6.
- Adams, Weaver (1939). White to Play and Win. David McKay Company. pp. 9–12.
- Evans, Larry (1970). Chess Catechism. Simon and Schuster. pp. 147, 153. ISBN 978-0-671-21531-6.
- de Firmian, Nick (1999). Modern Chess Openings. David McKay Company. pp. 144–45. ISBN 0-8129-3084-3.
- Id. at 143.
- Fischer, Bobby (1972). My 60 Memorable Games. Faber and Faber. pp. 280–81. ISBN 0-571-09987-4.
- Hooper, David and Kenneth Whyld (1996). The Oxford Companion to Chess. Oxford University. ISBN 0-19-280049-3.
- Lane, Gary (2004). The Bishop's Opening Explained. Batsford. ISBN 0-7134-8917-0.
- Weaver W. Adams, White to Play and Win, ISBN 978-0-923891-83-1
|The Wikibook Chess Opening Theory has a page on the topic of: Bishop's Opening|
- Goeller, Michael. The Bishop's Opening.
- Harding, Tim (August 1998). The Kibitzer: What Exactly is the Bishop's Opening?. ChessCafe.com.
- Harding, Tim (September 1998). The Kibitzer: The Eternal Appeal Of The Urusov Gambit. ChessCafe.com.
- Harding, Tim (October 1998). The Kibitzer: Is the Urusov Gambit Sound?. ChessCafe.com.