📝H. G. Muller wrote on Sat, Apr 25, 2015 03:46 PM UTC:
> So from which time are the first extant Sho Shogi game scores? Do you know that?
No, do you? You still haven't told me your sources.
BTW, just looking at the game suggests Sho Shogi would not stand a chance to rival Chu in popularity. Compared to Chu it is as dull as Shatranj is compared to modern Chess. In addition all historic variants seem to be based on Chu Shogi, and evolved towards larger size. If people would have thought the smaller game was better, you would have expected them to make variants based on Sho.