The idea is to lay a horse with initially low chances to win as soon as it pulls ahead after the race started (this also applies to any other type of sport where markets turn In-Play).
Lay-Dutch on all selections except the three favourites, in a race with 10 or more runners, if they make a lay book of 40% or less. Lay to the maximum loss of £20.
Lay the default lay amount on any selection whose price grew by at least 10% over the last 10 min, and is now less than 5.0. Don't lay on the favourite.
When the market turns in-play lay on all selections whose price jumped from less than 3 to higher than 6 within one refresh (potential losers).
What he was looking for is: lay on any selection whose price has doubled as compared to the price it had at the beginning of the race (SP, starting price); only lay in handicap markets, no sooner than 30 sec after the off.
Lay 5 EUR at the current lay price plus 5 ticks on the selection in-play if it meets the following conditions: its lay price first dropped to 1.9 or below, and eventually grew up to 3.0 or higher. Recoup the losses if the bet loses till it wins.
Lay on the horse whose official rating is at least 20% lower than the top two ratings.
Bet in markets without a clear favourite (the favourite's price before the off should be >= 2.0). When the market turns in-play, lay on the second favourite, if it is priced between 1.7 and 2.5.