Yep, there's mechanics that can adapted to such ends. As said, at the moment my main concern is nailing all the really setting-specific stuff, such as starships, energy weapons and aliens. Everything else should be covered.
Actually, there's a pretty good mechanic for 3d chess - the opposed complex skill check. Gives you more bang for your buck if you're really good at it, but keeps open the chance that you might win by sheer luck. Spycraft comes with several more detailed games and gambling examples, so the bridge officer's poker game is already covered there. (And yes, you can cheat at cards.
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Gatac
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Katy: Can I have the skill 'drive car off bridge and have parachute handy'?
Justin: It's kind of a limited skill.
Greg: Depends on how often you drive off bridges.
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