If you want to defeat sergei zavorotko then go to the confession booth where you went at the start of the game then pull the crouch trigger and sergei should come out of the booth then get your best weapon with the all weapons cheat (I recommend the sawn off.) and shoot him till he dies. Note. Once sergei has left the booth he wiil roam the church so you have to find him.
More tricks, tips and cheats for this game are right here - Hitman 2: Silent Assassin cheats
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