Mathematical Expressions
Of course OpenPPL supports arbitary complex mathematical expressions. As an example let us consider odds and outs.
// Calling according to odds and outs
WHEN AmountToCall / (AmountToCall + PotSize) > Outs / CardsLeft Call FORCE
Off course this example is a bit simplistic. It does not consider other players in the pot, implied odds on future streets, the chance to semibluff, etc. But I think you get the point.
The following operators are supported:
Equality Operators
Operator  Meaning  Example  Example explained  
=  equal 
 true, if you are on the button  
!=  not equal 

 
<  smaller  AmountToCall < 5  true, if there are less than 5 big blinds to call  
>  larger 
 true, if the pot is larger than 20 big blinds  
<= 
 AmountToCall <= 5 
 
>=  larger or equal  PotSize >= 20 

Logical Operators
The logical operators “and”, “or”, and “not” should be pretty selfexplanatory.
Operator  Example 
Not  WHEN (HaveNothing AND OpponentsLeft >= 2 AND NOT BotIsLastRaiser) Check FORCE 
And  WHEN (BotIsLastRaiser AND OpponentsLeft = 1 AND Bets = 0 And … BetHalfPot FORCE) 
XOr  Meaning: either or, which is true, if exactly one of the operands is true, but not both 
Or  WHEN (hand$AA OR hand$KK) RaiseMax FORCE 
Negation (Not) has highest priority of all operators, thereafter follow And, XOr and OR in decreasing order. So if you want to write an expression like
WHEN AmountToCall <= 4 AND (hand$22 OR hand$33…))
you have to throw in some extra brackets, otherwise the bot will call with 33 any bet and that is probably not what you want. More complicated expressions sometimes lead to confusion. If you have a problem with that you might want to revisit the basics of mathematical logic and the “Laws of De Morgan”.
Arithmetical Operators
OpenPPL also supports basic arithmetic. The usual rules apply of course. The percentageoperator has the same priority like multiplication and division, which is higher than addition, subtraction.
Operator  Meaning  Example 
+  addition  
–  subtraction  
*  multiplication  
/  division  
%  Percentageoperator  WHEN (AmountToCall <= 50% PotSize) Call FORCE 
Mod  Modulusoperator 
Bitwise Operators (for Experts)
Furthermore OpenPPL supports bitwise operations that work on all single bits of bitvectors or binary numbers simultaneously. They are useful for very lowlevelstuff like detecting which chairs are seated with Poker bot’s bitwise symbols (playersseatedbits, playersdealtbits, etc.). Most players won’t ever need these symbols, so we will only give you a link to a good explanation here: http://en.wikipedia.org/wiki/Bitwise_operation
Operator
BitAnd
BitCount
BitNot
BitOr
BitXOr
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