
September 09, 2011, 03:19:36 AM 

Your probability doesn't change if you pause mining. If you buy a lottery ticket every week and your odds are 1/x you'll win that week. If you skip buying a ticket one week you have no chance of winning that week, but next week (assuming you buy a ticket) they are 1/x you'll win.
With mining, you buy as many tickets as you can (by mining) in a 10 minute period (the target block rate.) If you pause mining for 5 minutes in the middle of a block you have reduced your chance of finding a winning ticket by 50% in that period, but only in that period.
For reference, 200MH/s is about 60 tickets/minute and it takes approximately 1.8 million tickets (on average) to win.
