
The Opera Game was a chess game played in October or November 1858 at the Salle Ventadour in Paris. The American master Paul Morphy played against two amateurs: the German noble Karl II, Duke of Brunswick, and the French aristocrat Comte Isouard de Vauvenargues. It was played as a consultation game, with Duke Karl and Count Isouard jointly deciding each move for the black pieces, while Morphy controlled the white pieces by himself. The game was played in a box while an opera was performed on stage. Morphy quickly checkmated his opponents following rapid development and sacrifice of material, including a queen sacrifice.
It is among the most famous chess games. It is often used by chess instructors to teach the importance of piece development, the value of sacrifices in mating combinations, and other concepts.

Frederick Milnes Edge recounted seeing Morphy play a game with the Duke and the Count in the Duke's opera box as follows:
H. R. H. the Duke of Brunswick is a thorough devotee to Caïssa; we never saw him but he was playing chess with some one or other. We were frequent visitors to his box at the Italian Opera; he had got a chess-board even there, and played throughout the performance. On our first visit “Norma” was performed. The Duke's box is right on the stage; so close, indeed, that you might kiss the prima donna without any trouble. Morphy sat with his back to the stage, and the Duke and Count Isouard facing him. Now it must not be supposed that he was comfortable. Decidedly otherwise; for I have already stated that he is passionately fond of music, and, under the circumstances, wished chess at Pluto. The game began and went on: his antagonists had heard Norma so often that they could, probably, sing it through without prompting; they did not even listen to most of it, but went on disputing with each other as to their next move. Then Madame Penco, who represented the Druidical priestess, kept looking towards the box, wondering what was the cause of the excitement inside; little dreaming that Caïssa was the only Casta Diva the inmates cared about. And those tremendous fellows, the “supes,” who “did” the Druids, how they marched down the stage, chaunting fire and bloodshed against the Roman host, who, they appeared to think, were inside the Duke's box.
The Duke of Brunswick's penchant for playing chess in his box is attested to by newspaper reports from November 1857, the year before he met Morphy, that he had caused a scandal at the Théâtre Italien by playing chess during a performance of La traviata and making so much noise that the director had to tell him to be quiet.
Johann Löwenthal, making no mention of this game's being played at an opera, places it among three games which "were played in the months of October and November, 1858, in Paris". Max Lange states that the Opera Game was played in October during a performance of The Barber of Seville. David Lawson says that this game was played during a performance of The Barber of Seville, and that Edge's anecdote refers to an earlier occasion when Morphy played the duo at a performance of Norma. Chess historian Edward Winter cites other authors who assert with no apparent contemporary source that the opera was La Cenerentola or The Marriage of Figaro.
Contemporary opera announcements in La presse record that there were performances of Norma at the Italiens on October 21, 23, 26, and 30, and performances of The Barber of Seville on November 4, 13, and 14; Lange's statements that the game was played in October and at a performance of The Barber of Seville are therefore irreconcilable.
George Frederick Pardon states that a different game of Morphy's against another opponent, Wincenty Budzyński, was played during a performance of The Barber of Seville.
White: Paul Morphy Black: Duke of Brunswick and Count Isouard Opening: Philidor Defence (ECO C41)
Paris, October/November 1858
1. e4 e5 2. Nf3 d6
3. d4 Bg4?
4. dxe5 Bxf3
5. Qxf3
5... dxe5 6. Bc4 Nf6?
| a | b | c | d | e | f | g | h | ||
| 8 | 8 | ||||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
7. Qb3 Qe7 (diagram)
8. Nc3
8... c6
9. Bg5 b5?
10. Nxb5!
10... cxb5
11. Bxb5+
11... Nbd7
| a | b | c | d | e | f | g | h | ||
| 8 | 8 | ||||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
12. 0-0-0 Rd8 (diagram)
13. Rxd7 Rxd7
14. Rd1
14... Qe6
15. Bxd7+ Nxd7
16. Qb8+!
Steinitz praises this "very fine finish to a most elegant game." Sergeant remarks, "No doubt the opposition was weak; but Morphy's method of overcoming it was most beautifully logical—a Damascus blade cutting a silk cushion."
| a | b | c | d | e | f | g | h | ||
| 8 | 8 | ||||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
This mating pattern is sometimes called the "opera mate" in reference to this game. Other than the king, all of White's remaining pieces play a role in the checkmate. Therefore, the position satisfies the definition of an economical mate. Economical mate is one of a few terms used by chess problem composers to describe the aesthetic properties of a checkmate position; related concepts include pure mate, model mate, and ideal mate. The final position nearly satisfies the criteria of a model mate, but fails on one condition: there are two reasons why the black king cannot be moved to the square f8. It is occupied by a bishop of the same colour, and it is guarded by the white rook.
Tommaso Cambray-Digny celebrated this game in a poem titled "Scacchi e Musica."
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