This is the duplication of my analysis if Sente took the Silver on 7i by Gx7i at the 96th move of 3rd game of 22nd Ryuo-sen yesterday responding to a question raised in 81-square universe.
It's natural to have such a qustion you raised. Here are the variation. In short, if Sente(Black) took the Silver on 7i, there woud have been no mate for Gote(White) and Sente would have had no defense. Here are some variations.
(1)S*7i Gx7i P*8g Kx8g Rx7i+
G*2b Rx2b Bx2b+ Kx2b S*3c K-1c Lx1e, P*1d, Then Black has no more effective check.
G*2b Rx2b Bx2b+ Kx2b R*4b P*3b S*3c K-1c Lx1e P*1d, Then Black has no more effective check
AdditionP*2c G*7f Sx7f +Rx7f K-9g +Rx8f K-9h +R-8h(mate)
P*2c G*7f K-9g N*8e Px8e Nx8e K-9h +Rx6h Sx6h G*8g(mate)
CorrectionG*8h Rx8f Sx8f G*7f K-9g Gx8f Kx8f +Rx8h P*8g G*7f(mate)
G*8h Rx8f Sx8f G*7f K-9h +Rx8h Kx8h P*8g K-9h G*8h K-9g N-8e(mate)
G*8h Rx8f Kx8f +Rx8h Sx8h G*7f K-9g N-8e K-9h N*8f(mate)
S*7h G*8h Sx8h Rx8f Kx8f +Rx8h S-8g S*8e Kx7e G-7d(mate)
S*7h G*8h K-9g N*8e Px8e Nx8e K-8f Nx7g+ P*8e +N-7f K-9g S*8f(mate)
G*7h +Rx8i G-8h Rx8f Kx8f +Rx8h Sx8h G*7f K-9g N-8e K-9h N*8f K-8i G*7h Gx7h Nx7h+ Kx7h N*8f K-6h G*6g K-5i B-5h+(mate)
G*7h +Rx8i G-8h Rx8f Sx8f G*7f K-9g N*8e Sx8e Nx8e(mate)
AdditionG6h-7h Rx8f Kx8f N*7d K-8g P*8f Sx8f G*7f K-9h +Rx7h P*8h G*8g(mate)
G6h-7h Rx8f Sx8f G*7f K-9g N*8e Sx8e Nx8e K-9h +Rx7h P*8h G*8g(mate)
G6h-7h Rx8f K-9g G*8g Gx8g Rx8g+ Kx8g B-6i+ K-8f G*8e K-9g Gx9f K-9h +B-8g(mate)
(2)S*7i Gx7i P*8g K-9h Rx7i+G*2b Rx2b Bx2b+ Kx2b S*3c K-1c Lx1e, P*1d, Then Black has no more effective check.
G*2b Rx2b Bx2b+ Kx2b R*4b P*3b S*3c K-1c Lx1e P*1d, Then Black has no more effective check.
G*7h +Rx6h Sx6h G*8h K-9g N*8e Px8e Nx8e K-8f G*7f(mate)
G*7h +Rx6h Sx6h G*8h Gx8h Kx8h Rx8f P*8g Rx8g+ Kx8g B-6i+ S*7h G*7f K-9h G*8g Sx8g +Bx8g(mate)
CorrectionG*7h G*8h Sx8h Px8h+ Gx8h +Rx8h Kx8h Rx8f P*8g Rx8g+ Kx8g P*8f Kx8f G*7f K-9g N-8e K-8h P*8g K-7i S*8h K-7h N*8f(mate)
As you see above, Watanabe's S*7i was a very brilliant Silver sacrifice.
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