Monty's Pass made owner Mike Futter a very happy man after earning almost £1m for winning the Grand National at Aintree.
Futter said he had made around £800,000 from a series of bets on Monty's Pass in the run-up to the National.
And his share of the £348,000 first prize is likely to take his winnings to around £900,000.
The bingo club owner, who is head of the five-strong Dee Racing Syndicate, had also told all his friends to back the horse.
"I started backing him at at 66-1 before the weights came out," said 57-year-old Futter.
It was quite something to finish the race, let alone to win it
Winning jockey Barry Geraghty
"Then I backed him at 50-1 but then after he was tipped up in the Racing Post the price got shorter - and then I had a bit more at 25-1.
"The biggest bet was one of £10,000 at 50-1. I reckon I have cleared £800,000.
"There are about eight bookmaking firms involved, including three or four of the top ones."
Monty's Pass was trainer Jimmy Mangan's sole challenger from his 15-horse yard in County Cork in Ireland.
"The horse started giving us the right vibes a couple of weeks ago," said Mangan.
"We knew we had him back [to his best] then. He was becoming electric.
"The horse came to me as a four-year-old and he won a point-to-point race at my local course.
"He was only moderate early on but the one quality he has always had is his jumping."
Jockey Barry Geraghty, who had five winners at last month's Cheltenham Festival, said Monty's Pass had run the perfect race.
"He was always jumping beautifully and he was just in top condition. I was happy just to sit there behind the leaders and stay out of trouble.
"I was offered the ride a few months ago and I accepted straight away," said Geraghty.
"Maybe I could have had other rides in the race but there was no way I was going to insult good people like this by getting off this horse.
"The whole thing has been just brilliant. I was sixth in the race three years ago, but in the last two years I didn't get round.
"So it was quite something to finish the race, let alone to win it like he did."