This is known as the cancellation system. Pick a series of numbers, say 1,2,3,4,5. Your first bet is the total of the two numbers on the end, or 6 units in this case. If you lose it, you cancel out the 1 and the 5, add the six to the end of the series and bet the 6 and the 2, for a total of eight units bet. Lose that one and you add the eight to the series, cancel the 2 and the six and bet a total of 11 (3+8) and so on. If you win, you proceed to the inside numbers until they are all cancelled out. Again, a loser, but an insidious one.

If any other number rolls you lose. This bet is placed in the area marked "Field" on the layout. Unless other Proposition bets, you have to wager the equivalent to a Pass or Don't line bet. For example, if the minimum Pass line bet is $5.00, you must wager at least this amount for a Field bet.