CLAMP no kiseki

[Arcademan]

Released in Japan and (eventually) released in the U.S. by TOKYOPOP, this 12 part series traces the 15 year history of CLAMP. Each book also contained 3 chess pieces. When completed, created a chess set made entirely of CLAMP characters (the black and white Mokonas as pawns). Discuss the series in this thread and wonder why people were willing to dish out $30 a issue for 32 pages 

[Arcademan]

Someone recently asked me a question about the chess pieces from the CLAMP no kiseki series. I wasn't sure of the answer so if anyone else has any ideas, let's hear them:

I always wondered how they decided which characters were on the white side & which were on the black side. Is there any logic behind the choices that you can discern, Arcade?

I think it's the type of storylines in each series that more or less dictate the sides. Whites are the nicer series like Cardcaptor Sakura and Angelic Layer, the black the darker series like X/1999 and xxxHolic though some of the logic behind it doesn't seem to fit that motiff:

BLACK
Bishop Kimihiro Watanuki (xxxHolic)
Bishop Seishirō Sakurazuka (Tokyo Babylon)
Rook Sū (Clover)
Knight Nokoru Imonoyama (Clamp School Detectives)
Rook Ashura (RG Veda) 
King Kamui Shirō (X)
King Fūma Monō (X)
Bishop Fay D. Flourite (Tsubasa: Reservoir Chronicle)
Queen Yūko Ichihara (xxxHolic)
Knight Kurogane (Tsubasa: Reservoir Chronicle)
*King Spinel Sun (Cardcaptor Sakura)

WHITE
Queen Sakura Kinomoto (Cardcaptor Sakura)
Queen Tomoyo Daidōji (Cardcaptor Sakura)
Bishop Subaru Sumeragi (Tokyo Babylon)
Rook Misaki Suzuhara (Angelic Layer)
Knight Hikaru Shidou (Magic Knight Rayearth)
Rook Chī (Chobits)
Knight Akira Ijyuin (Man of Many Faces/CLAMP School Detectives)
Bishop Kohaku (Wish)
Bishop Miyuki-chan (Miyuki-chan in Wonderland)
King Syaoran (Tsubasa: Reservoir Chronicle)
*King Kero-chan (Cardcaptor Sakura)

The Mokona pawns are self-explanatory and of course what other series could you go with that has the most royalty than Cardcaptor Sakura (2 queens, 2 kings albeit alternate pieces and indirectly, Syaoran from the TRC series)