In chess, the Monticelli Trap is a combination in the Bogo–Indian Defence, named for Italian champion Mario Monticelli from the game Monticelli versus Prokeš, Budapest 1926. Although it is called a trap because White wins the exchange, Black does obtain some compensation.
The trap begins with the moves:
1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+
Black plays the Bogo–Indian Defence
4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Bb7 7. Bg2 O-O 8. Nc3 Ne4 9. Qc2 Nxc3 10. Ng5!
Mario Monticelli (16 March 1902, Venice – 30 June 1995, Milan) was an Italian chess player. He was awarded the International Master (IM) title in 1950 and the Grandmaster title honoris causa (GME) in 1985.
In 1922, he won in Rome (ITA-ch Univ). In 1925, he won in Bologna. In 1926, Monticelli tied for 1st with Ernst Gruenfeld in Budapest. In 1929, he took 11th in Budapest (José Raúl Capablanca won). In 1929, he tied for 4-5th in Barcelona (Capablanca won). In 1930, he took 14th in San Remo (Alexander Alekhine won). In 1933, Monticelli won in Milan (Padulli Memorial). In 1934, he took 8th in Syracuse (Samuel Reshevsky won). In 1938, he tied for 1st with Erich Eliskases in Milan. Monticelli was Italian Champion in 1929, 1934, and 1939.