After the trick is resolved, the bot will always pick the lowest chip on the table to pick up. This is fine, since the chips played with don't have suits. In 12 Chip Trick - a trick taking game - the bot always plays blind into the trick. The other day I played 12 Chip Trick with my partner, and it - like many many other games - has a sort of bot standing in for the missing player. On a computer this issue is easily solved with the addition of CPU players, but in lieu of having a computer make all your decisions, this problem is less straightforward in the board gaming space.
Not having the requisite amount of players for a full game of something is a known problem in not just board games but gaming in general. Warning: incoherent pointless stream of thought ahead.