Black is aiming A at the next.
This is a bargain black loses.
The challenge is to get black through hell.
3 stones now white would be willing to give up.
It is very difficult to find.
This is . . .
where black will ignore any pae-threat (ko-threat),
the game will end.
Therefore, it is absolutely.
This is 40 times the number predicted ahead.
By giving up 4 black stones advantage becomes black.
So, white induces capturing race.
Eventually black will win capturing race.
Now, black is alive and sente, because of A.
If black lives too caught up in this place is a taste of the intrusion.