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Any number may play, but only one player — the caster — has the dice at any one time.
In each round, the caster specifies a number between 5 and 9 inclusive: this is the main. He then throws two dice.
This is simpler to follow in a table:
| Main | Nicks | Outs | Chance |
|---|---|---|---|
| 5 | 5 | 2, 3, 11, 12 | Anything else |
| 6 | 6, 12 | 2, 3, 11 | |
| 7 | 7, 11 | 2, 3, 12 | |
| 8 | 8, 12 | 2, 3, 11 | |
| 9 | 9 | 2, 3, 11, 12 |
As long as he keeps winning, the caster may keep playing: but if he loses three times in succession, he must pass the dice to the player to his left, who becomes the new caster.
Bets are between the caster and the bank (the setter), which may be the remaining players acting as a group.
If the caster nicks on the first throw, he wins an amount equal to his stake.
If he throws a chance, the setter gives him odds:
| Main | Chance | ||||||
|---|---|---|---|---|---|---|---|
| 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| 5 | 4/3 | - | 4/5 | 2/3 | 4/5 | 1/1 | 4/3 |
| 6 | 5/3 | 5/4 | - | 5/6 | 1/1 | 5/4 | 5/3 |
| 7 | 2/1 | 3/2 | 6/5 | - | 6/5 | 3/2 | 2/1 |
| 8 | 5/3 | 5/4 | 1/1 | 5/6 | - | 5/4 | 5/3 |
| 9 | 4/3 | 1/1 | 4/5 | 2/3 | 4/5 | - | 4/3 |
For example, with a stake of £10, a main of 7 and a chance of 4, a caster stands to win £15 (3/2 × £10); with the same stake, a main of 5 and a chance of 6, he could win £8 (4/5 × £10).
At its heart, craps is a version of Hazard where the main is always 7:
However, betting in craps is significantly more complicated: see its entry for details.