Its already designed.Support and Resistance.
Agreed.Quote from Nab:
Silly question. This is identical to finding a consistently winning system (as long as the loses do not mainly come from slippage/commissions).
Quote from OddTrader:
Perhaps reversing All the signals of the 10% win-rate set-up would give you a 90% win-rate set-up!![]()

Quote from 1a2b3cppp:
I've been trying all night.
A good starting place and good thought exercise is to start with a few of your favorite popular indicators and reverse the signals.
You'll find you still do about the same.
Take something like stochastics that is supposed to tell you when the market is "overbought" or "oversold" and you're supposed to buy or sell there. If you reverse them (for example, sell when the indicator says it's oversold), you'll find that you end up making money during big trends, and losing money otherwise, which is basically the opposite of what happens when you follow that indicator's normal signals.
Neither is profitable, though.
Try to design a consistently losing system.