The Dee-Nee tiebreaker discussion thread (and the suggestion that slaughters screw things up) gave me an idea ...
NYSLPSZE
This code changes the number of runs required for a "slaughter" from 10 to 255. Unless you're really drunk and don't notice that the game has gone on for two hours and your opponent has passed out, this should effectively disable the slaughter.
Credit to nesdev.parodius.com for providing excellent NES Game Genie documentation.
Nightwulf
Oh, while I'm at it, if you're using FCEU for Game Genie codes, the Game Genie ROM must be in the FCEU directory with the filename gg.rom. I've attached that file if anyone needs it.
Nightwulf