Chess piece
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The chess piece is a type of trinket awarded from viking raids to pirates randomly chosen* aboard the ship when they defeat the vikings in a swordfight or rumble. It was first seen in release 2011-01-19. It is one of the common types of viking raid trinkets. The chess piece only contains one colour, similar to all of the viking trinkets.
*On doubloon oceans, the pirate must possess a pirate badge or higher. On subscription oceans, they must be subscribed.