The Monticelli Trap arises in a variation of the Bogo-Indian Defense and forces black to lose the exchange.

The common move order is:

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!

Capablanca famously fell into this trap with black but was nevertheless able to hold a draw.