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The AI Systems of Left 4 Dead - Valve

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Goal: Provide Competent Human Player Proxies<br />

‣ Trust<br />

• Cooperative nature <strong>of</strong> game<br />

requires close collaboration <strong>of</strong><br />

Survivor team and implicit trust<br />

in teammate’s action choices<br />

• SurvivorBots prioritize human<br />

teammates over bots<br />

• Game “cheats” to guarantee<br />

some undesirable events<br />

cannot occur<br />

• SurvivorBots cannot deal<br />

friendly fire damage<br />

• SurvivorBots never use<br />

Molotovs<br />

• If a SurvivorBot ever gets far<br />

out <strong>of</strong> place for any reason, it<br />

is teleported near the team<br />

when no human is looking at it

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