The late English world class player, John Collings, was known as completely unpredictable at the table, which made his opponents do the strangest things against him.
At some point on this deal North was in 7♦ doubled by West, but Collings pulled to 7♥ which funnily enough also got the red card. Believe it or not: Collings landed his grand slam!!?? Wrong, there was no revoke!
How did he accomplish this "impossible" mission? Hidden text will be fine in case more than you would like to give it a go.
Roland

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S: 7H doubled
Lead: CK