From: GRIMBERGEN <at> KUNPV1 <dot> PSYCH <dot> KUN <dot> NL
Date: 3 aug 1990
Subject: RE: Tsume-shogi

Ken Aizawa asked if every black move in a tsume must be check. The
answer is a definite "yes". Problems with non-checking moves but
certain mate are "hisshi"-problems. Also an interesting field of
study but not as widespread as tsume.
 
Reijer Grimbergen