Quote from gmst:
no concrete definition, just a feel thing - however that is not key.
Key is (not only in my opinion, but I have full confidence on this) that I am risking 8-10 points for a multi-day swing on which i stand to make 20-40 points. Based on the amount of backfill ES does, its a no-brainer that this strategy will be profitable over a large number of trades. You need to be careful about two things though - Dont sell when market is cruising along gaining 4-6-8 points everyday, since equity markets have a uptrend bias over the long run. And when you are buying in a oversold condition, dont use more than 10-15 point stop.
Edit: Anything can happen over 1 trade, what i said above will be true over multiple trades.