IY UMa on May 20 Dear Colleagues, We have just finished analyzing the May 20 observation by Tanabe-san. Superhumps appear as "pre-eclipse" humps (with a reduced amplitude than before). Eclipses are sharp and deep, 1.5 mag in depth. More detailed analysis will be later presented by Uemura-san. Regards, Taichi Kato VSNET Collaboration team