Simplest finesses in Spades?
The smaller amount of information in Spades means it is hard to purposefully start a finesse, but you can still easily continue one if it is started by accident. For example, your partner happens to lead small and first opponent plays small, and you are holding the AQ. You can now play the Q and hope that the K is not in the remaining opponent's hand. In Bridge in the simplest model, this has a half chance of working because you don't know which opponent has your missing K. Here in the simplest model it's very similar: there's a 1/3 chance your choice doesn't matter at all (because your partner has the K), but when deciding your move you should assume that your choice does matter (such an assumption will never hurt you), and so there's effectively still a half-half chance of success.