43) 48-42 appears strong to force balck in a difficult endgame, unless I am mistaken of course. Some variants:

43. 48-42 17-21
44. 38-33 03-08
45. 28-22 08-12
46. 35-30 24x35
47. 22-17
And black does not have a waiting move.
 

43. 48-42 03-08
44. 35-30 24x35
45. 34-30 35x24
46. 27-21 16x27
47. 32x03 23x34
Not very difficult, but this highlights the problem of back's position, the natural development of 3 to 12 cannot be realized.


43. 48-42 16-21
44. 27x16 18-22
45. 25-20 22x44
46. 20x20
Seems a difficult end game
 

I overlooked 24-29 at first, but that leads to a draw:

43. 48-42 24-29
44. 39-33 29x40
45. 35x44 17-22
46. 28x17 23-28
47. 32x12 13-18