Back Dutching at lay prices and Lay Dutching at back prices
Place back bets on selected runners to win or lose a fixed amount, but at their lay prices.
The idea behind this is obviously trying to get the lower book percentage. In overwhelming majority of cases the back book % is always higher than 100%. So backing at lay prices makes the book % less than 100%.
The biggest drawback is the fact that at first all the bets may stay unmatched. But in markets with high liquidity this may be balanced by the possibility to match all the bets either a couple of minutes before the off, or when the market turns In-Play. Of course there are no guarantees whatsoever.
Below are examples of bets placed by the triggers.