AI: Difference between revisions

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The exact inner mechanics of the '''AI''' remain a mystery. However, some general rules of its behavior are known. Those were either deducted through observation of the AI's movements, or they have been stated by the [[User:Fizzer|creator]] himself on the [[forum]]s.  
The WarLight AI's behavior is determined by a set of algorithms.  The source code behind these algorithms can be viewed on GitHub at https://github.com/FizzerWL/WarLight.AI.


== Weighted Random ==
== Weighted Random ==
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Confirmed:
Confirmed:


* It currently does not know how to use any card other than the [[reinforcement card]]. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}136}} {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}2159&Offset{{=}}3}}
* The only cards it can play are the [[reinforcement card]], [[sanctions card]], [[bomb card]], [[blockade card]], and [[diplomacy card]].
* It prefers to expand as long as it still sees [[neutral]] [[bonuses]] to expand to. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}136&Offset{{=}}12}}
* It prefers to expand as long as it still sees [[neutral]] [[bonuses]] to expand to, as long as the bonus meets its criteria for being a good bonus. {{Ref|http://warlight.net/Forum/Thread?ThreadID{{=}}136&Offset{{=}}12}}
* When deciding whether or not to complete a bonus, the AI currently uses (bonus value) * 3 - (armies we'd have to kill to take the bonus). If this comes out negative, it won't deem the bonus worthy in some cases. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}3218&Offset{{=}}17}}


Observed:


* It tends to attack with twice as many armies as the [[territory]] is showing. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}1744&Offset{{=}}2}}
* It generally only places armies in a few spots and attacks from them. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}1744&Offset{{=}}2}}
* It tends to prefer neutral territories over player controlled territories, but it mostly prefers to attack the weakest territories. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}1744&Offset{{=}}4}}
* It tends to favor getting bonuses and breaking enemy bonuses higher than making random other attacks. {{Ref|http://warlight.net/Forum/Thread.aspx?ThreadID{{=}}1744&Offset{{=}}4}}
* It tends to issue attacks with all of its armies in a territory with more than one army and is unaware of the fact that one army must remain on every territory while attacking.


== Behaviour of the AI in team games ==
== Behaviour of the AI in team games ==
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* The AI will not play cards when teamed with a human teammate unless it must play cards by rule.  The only circumstance where an AI must play cards when teamed with a human teammate is if the last player on a team turns into an AI via boot or surrender and [[cards]] must be used by that team that turn.
* The AI will not play cards when teamed with a human teammate unless it must play cards by rule.  The only circumstance where an AI must play cards when teamed with a human teammate is if the last player on a team turns into an AI via boot or surrender and [[cards]] must be used by that team that turn.
== Changes ==
The AI's behavior has not been changed since it was introduced in 2009. Changing the AI's behavior, even slightly, would invalidate every single-player score that's been achieved. If the AI is to be improved in the future, it will likely be done in conjunction with a revamp of the single player levels.


== Playing Itself ==  
== Playing Itself ==  

Revision as of 06:05, 10 April 2016

The WarLight AI's behavior is determined by a set of algorithms. The source code behind these algorithms can be viewed on GitHub at https://github.com/FizzerWL/WarLight.AI.

Weighted Random

The AI constructs a list of actions it could take on each turn, along with a value of how strongly it feels it should do that action. It then does a weighted random against that list. This means that the AI is never perfectly predictable, but it does have tendencies.

General behaviour of the AI

Confirmed:


Behaviour of the AI in team games

  • It will only attack teammates in two circumstances:
  1. If a bonus is entirely controlled by teammates and it has >= 50% of the territories. It will only do attacks of 2 then.
  2. If it's expanding into a new bonus that no teammates control. [2]
  • The AI will not play cards when teamed with a human teammate unless it must play cards by rule. The only circumstance where an AI must play cards when teamed with a human teammate is if the last player on a team turns into an AI via boot or surrender and cards must be used by that team that turn.

Playing Itself

Under the single-player tab, you can set up a game full of AIs, no fog and watch the entire game play out on its own.

However, under the multi-player tab, the AI will not play a game without any humans involved. If only AIs remain in a game, the AIs will simply vote to end. If voting to end is not possible, such as in a tournament game, the AIs will just pick a winner randomly. This restriction is necessary due to the way that multi-player games work. Due to WarLight's flexible engine, someone could construct a game that took thousands or millions of turns to finish. For example, a game with no bonuses or large wastelands separating players. The WarLight server would strain to complete these games, likely causing the entire site to grind to a halt.