In single player games, think of it like this. You're on the blue team in CTF, and if you score one more time, you win the game. Except you lose the game if you score in single player. If you have the red flag (you'll get the red flag if you touch the red base, obviously), and you touch the blue base, you die. The message, "LOSER," will appear at the bottom of the screen in the process. BlurredD is usually credited on finding this method (he did it abit differently, though) because his level was the first where people saw this done, but I had found it out one day, too, and never relized that it wasn't done before. So it's not really clear on who found out how to do this, not that it matters. Anyway, if you still have problems, let us know. Remember, don't put the events on the VERY bottom of the screen. If I were you, I would put the blue bases two or three tiles from the very bottom, and the red bases two or three tiles above the blue bases. Remember, gravity does not affect the bases, and you can have as many as you want. Just don't put lots of bases in a multiplayer game, because there are numerous bugs that can occur when you do so, for example, sometimes only the host can see who has the flag. Only do this if you know what you're doing (i.e. making an Assassination level or something).

PS: I did not proofread this because I'm lazy. Yay. ;D

PSS: My little sister (Evol Weevil, as you JJ2ers might know her) used to use the name, "EvilMonkey," when she played online games. Interesting.