Many variants of janggi have been developed over the centuries. A few of these variants are still regularly played, though none are nearly as popular as janggi itself.
Gwangsanghui (廣象戱, 광상희) is an 18th-century janggi variant. It was recorded in Noeyeonjip (뇌연집) which was written by Nam Yuyong (남유용).
Sanjangjanggi (三將象棋, 산장장기) is an janggi variant with an unusual rule. In sanjangjanggi, the king can escape check only by capturing the checking piece with the king in the next turn. Thus, double check is an automatic loss for the side with the checked king since the king cannot capture both checking pieces in a single move.