Lay on the chosen horse, then immediately after that Back to green up at the price of the horse that is the next favourite to the one you laid on.
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.
Place a back bet at SP in the place market on a horse if its price in the place market is greater than X and its price in the win market is less than Y.
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Gamble responsibly! Always be aware that betting is NOT risk-free. You must be 18+ years old before you try gambling, but even as an adult, withhold from spending money in an ill-judged manner. Our company does not encourage you to prefer gambling over other meaningful activities. If gambling is affecting your life or the lives of people close to you, please contact GamCare