Moves 51 ~ 100
The first key move in this diagram is White 53. It is called a makeshift (ma ni awase) move, and is typical of White play in no-komi go and above all of handicap go.
The second move to note is Black 62. This is the point he was aiming at with Back 50. It does two things. First, it tilts the balance of territory in his favour. Second it is a fortress glaring down against the impudent white force in the lower right.
White resorts to yet another makeshift tactic with the forcing moves 65 and 67.
Although Black has been controlling the flow of the game, Chitoku's 75 and 77 add a White dimension to its future course.
Black 64 had been intended to settle the shapes. That is, to confirm the advantage he has already built up. White refuses to go along with that. With 75, he opts for the amashi strategy typical of White in no-komi go, which means he takes territory and lets his weak groups fend for themselves, relying naturally on his superior tactical skill. You have to be somebody special to do that against Jowa.
White 81 is the move that confirms the amashi strategy, by the way. He has allowed Black a ponnuki capture at 80, which just seems to add to the troubles of the white group in the lower right. But of course Black has to find out how to exploit this weakness. Just going at it hammer and tongs at once would be just what White wants. White would end up alive and Black would end up having overstretched himself. White would then spend the rest of the game sniping at the weaknesses in the stones that had unsuccessfully chase his group.
Jowa is too smart for that. Remembering that go is the surrounding game, he sets out to build fortresses in the north west and the south west. He makes his first deployment in the south west with 82. This might seem small, especially as it ends in gote. White 91 is certainly a nice move to get. But Jowa's vision included Black 92.
More importantly, see how Jowa accepts (a kind of) gote again with 100, making sure his own group is strengthened.
White's next move after this diagram was a tesuji. You may want to try to spot it.