There was a 4-player league played by

白鳥澄子 = Shiratori Sumiko -+-.  1-2
鈴木津奈 = Suzuki Tsuna     +-.+  2-1
小林千寿 = Kobayashi Chizu  +.+-  2-1
伊藤友恵 = Ito Tomoe        .--+  1-2

Kobayashi Chizu is challenger.

