The strategy trades in the direction of the trend (momentum) during
the high volatility sessions (European and early US) and against the
direction of the trend during the low volatility sessions (late US
and
Asian). Trend is short-term, defined by a few hourly candles.
Here is the link to post with full strategy decription:
https://www.dukascopy.com/fxcomm/blog/?action=post-show&post_id=218278