Teemantliige
Contents: Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus, Potassium, Sulfur, Sodium, Chlorine, Magnesium, Iron, Fluorine, Zinc, Rubidium, et al.
Klubid
Secret Dark Knight Society
84 liiget
Mat Bobula's Chess School
1 452 liiget
USChess
63 063 liiget
Chess.com Legends Club
2 238 297 liiget
Anna Rudolf's Fan Club
18 666 liiget