Alf and Kath Overy, of the Old Parsonage near Goole, East Yorkshire, put their home on the market last year.
But after it failed to sell for the £650,000 asking price, they decided to offer the 300-year-old Grade II listed building as a competition prize [for £60].
Entrants have been challenged to look at a doctored photograph of the house and guess where a missing shadow should fall.
The couple say they have limited the number of entries to 25,000 and plan to donate some of the money raised by the competition to the International League for the Protection of Horses.
"We thought we'd give everyone a chance and the response has been that it's an unusual, good idea", Mr Overy said， "Whoever gets it for £60, it could change their lives completely."
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