This system plays flat bets on the Pass Line 
and Don't Pass. 

A running count is kept as follows: 

A pass counts as +1. 

A miss counts as -1 (unless it was due to bar 
12 - then it counts as (0). 

When the count reaches +3 or -3 betting begins 
on the side that is behind. 

In other words, if +3 then Don't Pass is bet, 
if -3 then Pass Line is bet. 

Betting then continues until the count returns 
to zero. 

This system can also be used in roulette or 
baccarat also. 

A variation of the above is to use a 4 step 
Martingdale instead of flat betting - the 
choice is yours.