Moves 101 ~ 150
White 101 is the tesuji, Black locks a door with 104 and then White insouciantly continues with his amashi strategy by taking territory with 105. The interesting question for Black - Jowa - now is not so much whether he can kill the huge White group, but whether he has to. He's seen deeper - possibly deeper even than Chitoku. Black 106 is the Jowa move.
So now for adventures on the north-west frontier. At one level this is an interesting problem to study (move by move - a lot of little things change!) if you have read Richard Hunter's book on counting liberties. It is obviously, though, also having a big impact on the white column marching up from the south east. We have not deigned to mention the ko in the corner, but it should not be overlooked.
The result of the capturing race is that White wins it - technically - with 147, but there comes a time when discretion is the better part of valour, as the final diagram shows...