i have heard that one who has finished 50 games loses less points as one who has finished only 5 games if they lose. so it's understandable that one with a high ranking and a lot of finished games loses less points as a person with lower ranking and a few finished games. maybe???
i've read the shogi-rules and i go along with ughaibus proposal.
Otherwise it is possibile to write in the rules that's not a good manner to threat with continuos check.
what do you think about situations, where your opponent offers you a draw, because he threats time after time with "checkmate" and so there is no progress.
i speak about this situation:
http://brainking.com/game/ShowGame?g=494533