In 1645-1653, a six-game match (sogo, 争碁) was held
between Honinbo San'etsu and Yasui Sanchi II
for the post of Meijin Godokoro.
It ended in a 3-3 draw (Black winnning every game).

These six games were played as Castle Games,
and are found in ../castle as cg00[456789].sgf.