You've made your Phase, and a target opponent - not the one to your left - has not. If you have laid down your Phase but cannot go out, and the player to your left has laid down their Phase and is looking for that last lucky card to go out, you can throw them a card you'd otherwise use to hit on their Phase (or yours). You take a few points for the cards left in your hand, but stick the other players for big points. Perfectly valid play when you need to gain standing in points or Phases relative to that target player, and don't mind losing a couple points relative to the player on your left.. It may be the case that no matter what you discard, the next person will pick it up and go out, particularly in the Phases that require you to lay down 8 or 9 cards. For example, you may be on Phase 6, but you only have 8 cards to your run of 9, and the other two cards are playable. You draw a playable card: all three cards are playable, so you have no choice but to discard one. In that case . Phase 10 is a commercial version of the traditional card game Contract Rummy, but while Contract Rummy is played with standard playing-cards, Phase 10 uses special cards and has a somewhat different sequence of contracts..