It's a bad trade setup. I thought of it myself; I could but in small limits and huge stop losses, to try "survive" a fall. But if it can happen, it will happen (Murphy's Law) so if you were to loose -2000 points you had to win 10 if your take profit was 200 points... So you have to be right 10 in a row to cover a loss of -2000 points. 10:1 is just one extreme example, but I think every ratio that is based on that kind of theory will be mentally hard to deal with. It's better to form a strategy that has a ratio that is in your favor. The only way I see that this would work is to have a stop loss lower then any low ever before, it will probably take years to hit the stop loss, but if it were to dip it would also take forever to hit the take profit target and you will rack up fees.