As a sneaky-peek preview, these are my latest discoveries:
三色通貫 (San Shoku Tsuukan)
Mixed Straight = 123 456 789 in different suits (2 han closed, 1 han open)














紅一点 (Kouitten)
Crimson Speck = All Green but with red drag instead of green (yakuman)














大七星 (Dai Shichi Sei)
Big Seven Stars = All Honours + Seven Pairs (double yakuman)














金門橋 (Kinmonkyou)
Golden Gate Bridge = 123 345 567 789 in the same suit (yakuman, or double yakuman for concealed full flush)













