|Moves||1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Bxd2+ 5.Qxd2 b6 6.g3 Bb7 7.Bg2 O-O 8.Nc3 Ne4 9.Qc2 Nxc3 10.Ng5|
|Origin||Monticelli vs. Prokeš, Budapest 1926|
|Named after||Mario Monticelli|
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:
White threatens mate with 11.Qxh7# as well as 11.Bxb7 winning a bishop and a rook. After either 10...Ne4 11.Bxe4 or 10...Qxg5 11.Bxb7, Black loses the exchange, but obtains compensation in the form of one or more pawns and possibly a weakened white king. It is unclear if the position is a forced win for White.
The line has been played several times over the years at the highest levels, including Portisch-Andersson 1983, which ended in a draw, and Aronian-Postny 2005, which White won. The offer of the exchange has in fact been refused by White in grandmaster games (either by 10.Qxc3 or 10.Ng5 Ne4 11.Bxe4 Bxe4 12.Nxe4).