I would appreciate it if someone could explain what goes on this sentence from Hemingway's short story "The Gambler, the Nun, and the Radio."
The protagonist, an unlucky gambler, says:
"I never carry a gun. With my luck, if I carried a gun I would be hanged ten times a year. I am a cheap card player, only that." He stopped, then continued. "When I make a sum of money I gamble and when I gamble I lose. I have passed at dice for three thousand dollars and crapped out for the six. With good dice. More than once."
I cannot figure out the meaning of these two phrases in this context. "Crapped out for the six" = lost six thousand dollars? What does "passed at dice for three" mean then?
I would really appreciate your help. Thanks!