An official at the event in Warsaw, Poland explained that the disappearance took place during a game between Britain's Edward Martin and Thailand's Chollapat Itthi-Aree.
When both hopefuls noticed the missing piece during the last draw of the match, they had to each "show the contents of their pockets".
Despite a thorough search around and underneath the scrabble table, the 'G' was reportedly never found, and was eventually replaced by another.
New Zealand's Nigel Richards beat Australia's Andrew Fisher in the final. He also won the title in 2007.
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