There are four cards with numbers 1, 2, 3 and 4 printed on their faces, respectively.
Francis and Sophie each put $1 on the table as ante.
Francis takes one card, followed by Sophie.
Francis may choose between Raise (R) and Check (K).
If Francis chooses Check, the cards are checked and the player with a larger number wins the $1 ante.
If Francis chooses Raise, he puts $1 more on the table.
Then Sophie may choose Call (C) or Fold (F).
If Sophie calls, the cards are checked and the player with a larger number wins $2.
If Sophie folds, she loses the $1 ante to Francis.
