Yesterday Habu won the fourth game of 57th Osho-sen 4-wins match with Challenger Kubo 8 dan in 113 moves. Habu was Sente player. The opening strategy of the game was Gote's Gokigen Nakabisha(central Rook). Habu traded Bishops at the seventh move which is called Maruyama Vaccine since Maruyama (9 dan) used to beat Gokigen Nakabihsa with this bishop trade. I think Gote's 28th move of G-4b is questionable since it allowed Sente's forking bishop drop on 3a soon later.
The diagram below is the resignation one. The possible variations after that position would be as followings;
Rx7i+ Gx7i Lx8g+ Kx8g +Rx7i B*7a K-9b R*9c Nx9c G*8b(mate)
B*7a Gx7a Kx7a B*4d G*6b G*5b S-6a B*5a Sx5b B5ax6b+ K-8b +B-7a K-9b G*8b K-9c Gx8a K-9b +B-8b(mate)
B*7a Gx7a Kx7a B*4d G*6b G*5b S-6a B*5a K-8b B5ax6b+ Sx6b Bx6b K-9b S*8b Kx8b G*7b K-9b +B-7a(hisshi = brinkmate)
B*7a Gx7a Kx7a B*4d G*6b G*5b S-6a B*5a K-8b B5ax6b+ Sx6b Bx6b K-9b S*8b +Px5g +B-7a Rx7i+ Gx7i +Rx7i Kx7i +Px6h Sx6h G*7h Kx7h Lx8g Kx8g B*6i L*7h P-8d G*9c Nx9c Sx9c+(mate, replayable by clicking the arrow in the right direction under the diagram)
There would be more variations, but Gote was hopeless in any cases.
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