The 'Lefong' Trap - Win More Games

Introduction/Overview

Let's say you are white, in a bullet (1+0) game, and you open the game with 1. d4. Your opponent responds with 1...g6 and premoves 2...Bg7. After all, for many natural moves that white plays on move 2, such as 2.c4 or 2.e4 or 2...Nc3 black will always respond 2.Bg7. So why not premove it to save valuable time, especially in a bullet game?

The Trap

Here is where you get to implement a cheeky premove trap. I recommend not to do this all the time --- this is usually a one time trick that is usually played in bullet games with no increment.
You will play 2. Bh6. In normal circumstances this is a huge blunder and leads to the loss of a piece two different ways. Now, if Bg7 comes on the board because your oppoent premoved, you will simply take the bishop and also take the rook in the corner.

This is not 100% successful, and more often than not you may even lose the piece because your opponent may not have premoved. However in my personal experience with 20 victories from this trap I would suggest give it a try if you wish.
Only do this in bullet games, or in 3+0 games at your own risk. Be prepared to lose a bit of rating because this can go both ways.

Improvisations

This exact move order is not necessary to play this trap. Any variation where you capture a premoved fianchettoed bishop can be considered a 'Lefong.' One such game is between FM Yoavjm, who was able to trap Carlsen in a similar line in the English. Here is the game (https://lichess.org/study/dbdOJ032/178VAiNJ), but what happened is as such:
After cxd5 Nxd5 is the natural response, and so Carlsen premoved Bg2. However black captured with the queen, which is a Botez gambit but in hopes that Carlsen premoved Bg2, which would allow Qxg2 and the gain of a piece.

Conclusion

All in all that is the 'Lefong' trap. It is a somewhat dirty, cheapo type trick that is only meant for bullet play and very occasionally. I hope this has helped you to understand what the trap is (if you didn't know before) and inspire you to perhaps try this on your own if you play bullet or blitz.