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I have a question for Adrian King.
I hope he reads here.

On Roger Hare's page, you are credited for the promotion rule, "if one of your pieces does not promote on the turn on which it enters the promotion zone, then that piece may not promote on your next turn unless it makes a capture on that turn. On subsequent turns, however, the same piece may promote whether it makes a capture or not, provided that it makes a move partly or entirely within the promotion zone".

I would be interested in knowing the origin of this rule, in particular the idea that promotability on non-capture would regenerate after ONE TURN. This is different from the rule described in George Hodges' Middle Shogi Manual, which states that such promotability only regenerates by MOVING THAT PIECE. This again is different from the current rules of the Japanese Chu-Shogi Renmei, which specify that the piece would have to leave the zone first. (In other words, non-captures can only promote when they enter the zone from the outside; moves entirely in the zone or leaving it can promote only if they are captures.)

So it seems there are three different versions of the promotion rules for the historic game.