I think bughouse is the most popular of chess variants (if you don't count national variants like Xiangi or Shogi). It is usually played by 4 people, but I think 2-player version should be fun as well.
(sakla) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (Bütün ipuçlarını göster)