64 ( +1 | -1 ) Its quite a hard one but I think its a draw...
White must queen pawn, first must move or take the bishop, but even if bishop moves it can sac itself for the pawn...
So you either have to
1) take the bishop 2) make it move off a diagonal attacking d7 3) have the enemy king block the bishops path to d7 4) Muscle your bishop in to block d7 making the bishop move or exchange, with takeback from your king.
Only option 4) is maybe possible, and to do this with takeback requires moving your bishop to e6 then to c8 to make space for king supporting this square.
42 ( +1 | -1 ) Definitely a drawI think the key issue is that, once black's king gets to the d8 queening square, white will have no ability to drive him away. And holding him in place with an immediate Bf7 will also yield nothing, since the white K cannot both guard the bishop and help the pawn to queen (which itself is an impossible task as long as black's bishop can keep d7 under guard).