EndgameProblem44/attempts

White first plus sente  

is not sente on the Black group. But - is a sente sequence, turning the area into seki. In the corner Black E makes less than a point in the corner, while F in comparison makes 5.5. Let's say on average this is a -5 point corner. Let's also count the 4 points at the top to make this -9.

White first in sente  

Black makes 4.5 points here, White 1 less. In the upper left, Black has a ko at E. If White forestalls it at F she gains 7 points there. So we'll call this a draw.

Black first  

We can already count the 9 points at the top, minus the 3.5 in the corner, plus some additional gain at the top. White could make 2 of her original points but also lose 2 we didn't count. Black could make 4-5 more. Let's count this as 2.5 additionally. That makes this a count of approximately 8.

The tree becomes

                       1.75 (6.25)
                      / \
                     8 -4.5 (4.5)
                        / \
                       0  -9