Bishop's Opening


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, preserving the possibility of 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 assigns the Bishop's Opening the codes C23 and C24.

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, and LĂ©kĂł 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 from the second move. He was unable to prove this by defeating players stronger than himself, however, 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 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."

Main variations

Because White's second move makes no direct threat, Black has many possible second-move responses. As shown below, the Bishop's Opening offers opportunities to transpose to several other Open Games.

Berlin Defense: 2...Nf6

Probably Black's most popular second move is 2...Nf6, forcing White to decide how to defend the 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.
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. After 2...Nf6 3.d4 exd4 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...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, 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 7.Nh4 g6 8.f4 f5 9.Nf3 e4 10.Ng5 Bc5+. In practice, Black's lack of 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 5.0-0 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 Nf6 3.Bc4 Nxe4 4.Nf3 and 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3.

Summary after 2...Nf6

The Classical Defense is Black's symmetrical response, 2...Bc5.
White can then transpose into the Vienna Game or the Giuoco Piano, or remain in the Bishop's Opening with the Wing Gambit or the Philidor Variation. 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.
The Wing Gambit results in positions similar to those in the Evans Gambit. It can transpose into the Evans Gambit, for instance by 3.b4 Bxb4 4.c3 Ba5 5.Nf3 Nc6.
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 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 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

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 Calabrese Countergambit 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. Other analyses, however, have found that the sharp 3.f4! or safe 3.Nc3 are better for White than 3.d3.

Summary of other Black responses

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