Decided to take a risk and try jumping without a running start since I've got a good modifier:
Athletics:
1d20(19)+8=27 That gets me clear over 2 squares, landing in the third, which clears the pit! Whoo!
Since I've got the movement, I'll try to bull rush the goblin into the pit it's standing next to, which will end my movement in
H9.
Strength Attack vs. Fort:
1d20(9)+4=13If successful, I push the Goblin 1 square, which will force him to make a saving throw or else fall into the pit. Even if he saves, he falls prone in his space.
If unsuccessful, at least now I'm adjacent to him, and there's nowhere he can safely shift to.