Curley invested just over £15,000—effectively his entire savings—in a carefully concealed network of bets. Dozens of runners across Ireland and Britain each held between £50 and £300, sealed instructions, and orders to wait until the final moments before learning which horse to back. At 2:50 p.m., roughly ten minutes before the race, Curley activated six or seven trusted contacts, who telephoned groups of additional bettors and triggered a sudden wave of wagers on Yellow Sam while the horse was still available at 20–1. To prevent bookmakers from quickly laying off their liabilities or discovering the scale of the gamble, Curley’s associate Benny O’Hanlon occupied Bellewstown’s only usable public telephone. O’Hanlon pretended to spend half an hour speaking to a dying aunt in a nonexistent hospital; the sympathetic queue allowed him to remain in the booth while off-course bookmakers struggled to contact the course. Yellow Sam won by two and a half lengths, forcing bookmakers to pay the winnings because the maneuver, however deceptive, was not illegal under the rules then in force. The payout exceeded IR£300,000—more than €1.7 million in modern-value estimates—and arrived in single notes packed into 108 bags. Curley later used the winnings to build a stable of horses for further betting coups and purchase Middleton Park House. The scandalous efficiency of the operation prompted Irish bookmakers to change their rules, requiring bets above £100 to be placed at least thirty minutes before a race. Curley remained a celebrated and controversial figure, staging further successful coups, including a four-horse operation in January 2014 that reportedly cost bookmakers around £2 million.
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