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Across the scale from the world’s smallest chess set is, natch, the world’s largest chess set.
A number of crybabies have tried to lay claim to this over the years, but this set in Germany looks like a strong contender for the current record. The board measures 1,200 by 1,200 feet, pieces are 30 to 60 feet tell (albeit, they are laid flat on the ground).
It is currently being played by IM Elisabeth Pähtz against the world via the internet.
(source)
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If I had the right investor I would build plugs and urethane molds for sixteen or twenty foot tall kings as well as the whole set made out of fiberglass with aluminum frames on locking caster wheels, each moved around by an official member representing each side. The games would be a crowd attraction at medieval fairs as well as a football stadium with professional chess players calling the moves.