Buy if it breaks the horizontal resistance then finds support above it. If it does break horizontal resistance then it will probably find that 200MA (white line) as short term resistance before re-testing the horizontal line as support. This would be the time to buy. Then put a tight stop loss a few percent under the aforementioned horizontal resistance line. If you don't know where to put a stop-loss and have a greater 'pain tolerance' then you can simply sell if it loses shorter term MA support.