In the market 1 + 1 usually doesn't equal 2, sometimes it will equal 2.5, 2.1, 1.9 ect. The problem with being adaptive is that it usually results in curve fitting and style drift, both usually have the effect of reducing your capital.
The best thing is to have the skill to survive the bad parts and leave nothing behind when times are good. The bad traders always try and turning a loosing period into a winning one instead of just having an acceptable loss since that is good trading as well. An equity trader down -9% this year, is a very good trader.
