"a) When there is a next round of play, the player must place all of the initial wager at risk; b) When there is a next round of play, the play must place all of the winnings to date on the game (e.g., from all previous rounds after a first wager) at risk; c) When there is a next round of play, the play may place a portion of the initial wager and/or winnings to date at risk and withdraw another po" . . . .