The position of the ball must be deduced from the positions of the sportsmen shown in the photograph and perhaps where they are looking.
The game was extremely popular in the UK in the 1980s as part of newspaper promotions. Players would pay for a certain number of crosses on the picture, which was sent in by post to the promoter. Sometimes players could cover the picture with hundreds of crosses, and special stamps were manufactured which helped people fill in the picture with regular arrangements of crosses. Where several entrants had identified the correct area, a special high-powered magnifying device would be used to determine which of the crosses was the closest.
Sometimes the “correct answer” is the position of the ball as judged by a panel of experts, rather than the position of the actual ball before it was removed. This may be to prevent collusion with anyone who has seen the actual photograph used.
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