The Tancho spot must be between the eyes and preferable perfectly round. It must not go back onto the shoulder of the koi or down to the nose of the koi. Red may not appear anywhere else on the koi to be shown in Tancho class. A sumi pattern may cross the Tancho mark on a Tancho Showa. No other variety with a spot on the head may be shown in Tancho class. This includes Goshiki with red spot on the head, Bekko with black spot on the head and Ogon with orange spot on the head to name a few.
(Drawings from KoiKichi,Peter Waddington)
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