let the trade run when it's on the good side.
Thats very true. Never(subjective*) cut a winning/profitable trade.(Revision at the bottom)
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*Subjective, an example scenario where it doesn't work:
1- Range bound trading.
Price goes from 630-1 USD down to 590 USD and bounces.
Strategy: Buy at 591, SL: 589.6.
Entry: Only if price goes to 590 and comes back to 591. (Its counter-intuitive, I can explain the reasoning behind it)
Trade goes in the predicted direction. Reaches 630.
Now do we close the trade or let it run. Or just change the SL. If yes to SL change, what is the new SL?
I would close it. Simply because I would want to keep a SL of say 625, Thats 5 USD of profits I am ready to give back to the market.
Wait for breakout. i.e. cross above 631, take the trade again and SL is now say 629. WQhich is 3 less than what I would have given back to the market if it reversed.
Haven't considered whether I would switch the trade at the 630 point, lets consider it:
Entry: Price goes to 630 and reverses to 628(depends), Enter short SL: 631.3
Can the price trigger both trades? Yes, but calculate the potential profit from both trades and it doesn't make sense to hold the position.
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Never cut a winning/profitable trade in a trending market. Trends cannot be predicted hence open targets with SL changes when possible/rational.