Do you know this game?

[BigBuffet]

I learned it in high school in the mid 70's. I forgot the name and exact set-up. Hopefully someone knows it.

It's a con game used with cards. The operator can win or lose at will, just as in three-card monte or the shell game.
So obv the goal is to let the sucker win every so often.

The gist of it is you deal out a certain number of cards in columns and rows. The con and the mark take turns selecting a card (maybe 5 each?). The object is for the 10(?) cards to add up to a certain number 30(?).

It doesn't matter who selects first. The con will always be able to win or lose at will.

Thanks for any help.