Interesting thread trendie. I've never heard of the term 'grid trading' before. Although I have played around with the idea, not knowing it had a name. I know the dangers of the martingale betting system, but I must say martingale combined with mean reversion and good money management does really intrigue me. I've always liked the idea of waiting for something to deviate away from the mean by quite a bit, then entering with a martingale system up to 3 times. So for (a simple) example, wait until a indicator is oversold, enter long 0.25% of account, have a predefined stop and target with equal risk:reward, if stop is hit enter again with 0.5% of account, if stop is hit again enter with 1%.... If stopped out again wait for new trade and go back to 0.25% of account. It would rely on mean reversion. Just an idea anyway, it would need some work but it does appeal to me.
I also worked on an idea a few weeks ago using martingale and random entries, relying on not having 3 losing trades in a row often enough to outweigh the small wins. On paper it seemed to work so I had it programmed, but instead of the random entries I used fractals to enter to try and improve it. So I'd look for 3 bars forming a fractals as opposed to 5, then open a trade on the next bar providing it opens in the lower 50% of the previous bar for a short or upper 50% of previous bar for long. Stop placed above previous bars high for short and below previous bars low for long. Equal R:R, same martingale staged entry as previous. Back testing results were pretty dismal to be honest! I don't mind it when things don't work though, at least you rule something out and its all fun and games anyway. I'll add picture of back testing results and some notes I gave to the programmer. Would be cool if anyone would like to work on these ideas with me and help me improve them.
Sam.