FAN 2 Big Three Dragons(88 points)
Combination
Pungs or Kongs of all three Dragon Tiles
Combination of three Pungs or Kongs for all each of the Dragon tiles (R, G, W/B)
DOES NOT COMBINE WITH:
Two Dragons [54] (implied)
Dragon Pung [59] (implied)
DOES COMBINE WITH:
ALL Honors [11]
All Terminals & Honors [18]
Half Flush [50]
SCORING ELEMENT FREQUENCY:
Only some 0.035% of all MCR games end with this strict 3-sets combination scoring element.
source: Mahjong Greenbook MCR Rules 2014 (pdf)