Zeebo's Theorem - Nobody ever folded a 
full house.
Reasoning: Nobody is good enough to 
fold a 
monster. Most players aren't even good enough to 
fold a hand that looks like a 
monster but really isn't.
Application: There are two basic applications to this theory. The first is that if you put your opponent on a 
full house and you can beat them, 
don't be afraid to 
overbet/
push the 
river. This is particularly true when there is 
three of a kind on the board. Players will 
call with an incredible 
range of full houses in that 
spot. It is true that some 
villain may 
fold 22 on a board with three aces. However, you have no way of knowing if they have 22 or 
TT so go 
ahead and 
felt them. You are losing value if you 
don't. And sometimes they'll 
call with 22 anyway.
The second thing to realize is to never try to 
bluff anyone off a 
full house. If you have 22 on a board with three Aces, 
don't expect to be 
able to 
push 66 off his hand.
This theorem also generally applies to any 
monster over 
monster situation, from 
straight flush over 
quads/FH/nut 
flush down to 
set over set.
Reliability: This is the most reliable theorem. Nearly 100%. Somebody will 
post and argue that it is actually 100%.
Reference: 
http://captzeebo.supok.net/2006-02-12.html
Clarkmeister's Theorem - When you are OOP HU on the 
river and a 4-
flush comes always bet.
Reasoning: Simply put, a 4-
flush is an ideal bluffing situation.
Application: Bet a lot of 4-flushes, particularly HU, OOP on the 
river. You will get a ton of folds. Most everyone is folding non-
flush hands (that beat you) and small flushes.
Reliability: Yes, sometimes 
villain has the nut 
flush or calls with the K-high 
flush. Nothing you can do there. But over the long haul this is a VERY profitable 
spot to 
bluff.
Keep in mind though, you ARE turning your hand into a 
bluff. If you have a hand you 
don't want to 
turn into a bluff (very 
villain dependent) like 
top set or the K-high 
flush then 
check/calling can be fine.
BelugaWhale Theorem - When you are the preflop raiser and your 
turn bet is raised or 
check/
raise, it is time to re-evaluate 
one pair hands.
Reasoning: In raised pots, most players will just 
call down with 
one pair (be it 
pocket pair or 
top pair) type hands as 
well as draws. The 
turn is where most players who flopped a 
monster stop slowplaying and try to build pot. Or, they 
raise if they hit their 
draw.
Application: A 
raise on the 
turn is a signal to re-evaluate where you are at. It is not and automatic 
fold but you need to consider if 
villain has a 
monster or just hit his 
draw.
Reliability: Against 
fish and bad players in general, with the exception sometimes of LAGs and maniacs, this is a VERY reliably theorem. However, it is also an extremely popular and 
well known theorem, perhaps the best known. A lot of good players, particularly 2+2 players can try to 
exploit this theorem, especially by floating. So depending on the player (a decent player who is ALSO capable of making a play) you may need to 
discount this theorem considerably.
Yeti Theorem - A 
flop three bet on a dry (preferably paired) board is always a 
bluff.
Reasoning: On a paired (or otherwise very 
dry flop) a player with an 
overpair is unlikely to want to 
stack off because usually the only hand he gets 
action from is a 
monster that crushes him. For this reason, someone who DOES have a 
monster usually will usually slowplay here. Since neither strong hands like 
top pair and overpairs 
don't 3bet here and monsters 
don't 3bet here the only hands left that 3bet are bluffs.
Application: If someone 3bets you in this situation, 4bet/
push.
Reliability: These days this is mostly considered a joke theorem or a sarcastic excuse for 
spew. This is because Internet games between regulars are so much more aggressive than pre-Internet (ie live) games. For many players, "fast play is the new 
slow play" so players will 
stack off in these spots both with overpairs AND with monsters. 
Aggression is often used to conceal hand strength as much or more as slowplaying is used.
Against some players (ABC 
TAG) this theorem does still hold merit however.