About fishing...
Don't take one match or even a couple matches as 'proof' It's very possable to develop a streak of good moves, with out fishing.
It would take IMO something like 5 to 8 games in a row with a common element before I'd really consider someone fishing. Like say someone who wins 6 games in a row with the same sig style...
I've seen some really weird things happen in YB, so to call someone a cheater without at least 5 games of constant good moves, is too soon.
If you see someone who pulls a really good move like this...
"The panther angrily shatters the hells where it destructively rains upon the eyes; silences the terror of the lightbeam and skillfully reduces the chi of the fell dagger!"
3 or 4 times a match, and always seems to get a move like that when they need it. Then I'd say you have a reason to wonder. But just getting a few good moves, or having a good record is not any reason to assume someone is cheating.
I've seen people pull 3 or 4 sig styles in one match, and this was someone I knew didn't cheat... It's always possable. And the other day I saw Phoenix do a Fists of Fury attack, that for me would of been like a 5 point round. For him however it wasn't... So anything is possable.
As far as Meowthbot, and IRC... I'm quite against the idea of expecting people to pop on IRC to play this game. It's not needed, and just adds a extra bit of work for what is ment to be a simple game to play in our spare time. Also IRC logs are far from secure proof of anything... I've been a IRC Admin for like 4 years now, I know how easy they are to spoof or edit. The same goes for IRC Bots...
And speaking of which, if the Meowthbot doesn't have the same exact tables and such as the java one... It shouldn't be used in any match.