DragonKing: Watanabe won it with 71 moves. The variation after the final move is as YuryShpilev points out. N-5c+ would be a magical sacrifice.
I've dealt with it in my blog at http://shogi-excitinggame.blogspot.com/
(gem) Hvis du er interesseret i udviklingen af en turnering du spiller i, kan du diskutere med dine modspillere i denne turnerings forum. (HelenaTanein) (vis alle tips)