Although the topic has already been discussed numerously (
viewtopic.php?f=48&t=42348), we still return to the initial logics built in the contest rules.
This logic implies that any participant is expected to follow his positions and adjust the target levels in case of necessity. We do not want traders to open 5 mio positions (max allowed exposure per instrument) and leave them till the end of the month setting infinitely distant TP/SLs. Instead, we expect the trading process to be consistent, grounded and controlled by the trader.
A 2% limitation allows setting an initial range of little bit less than 300 pips for a EUR/USD position, which is quite adequate given the average figures of the daily volatility. All the more that one can always adjust the target levels in accordance with the instrument's movement.
The recent 1,000 pips move of the CHF is clearly an exceptional case and cannot be considered as a benchmark for defining the deviation limits for TP/SLs.