If someone deliberately misleads you to get what they want, they're a sandbagger. If you pretend not to know how to play pool so your opponent will bet money on a game, you're a sandbagger.

Sandbaggers deceive others about their real intentions or abilities, or otherwise use deception to gain something. In the law, if you know that a contract or warranty isn't valid, but you pretend to trust it so that you can sue later — you're a sandbagger. And in various sports and games, you're considered a sandbagger when you pretend to be less skilled than you really are so you can score higher or play with an unfairly high handicap.

Definitions of sandbagger
  1. noun
    someone who deceives you about his true nature or intent in order to take advantage of you
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    type of:
    beguiler, cheat, cheater, deceiver, slicker, trickster
    someone who leads you to believe something that is not true
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