Sumoku Challenge

[Geo]

I challenge you.

Sumoku are varients of Sudoku. I am willing to bet that there is more than one way to solve this particular one, and that although it's possible to identify the number in B4 as a 3, beyond that there is no way to definitively ascertain the contents of any specific square in the grid without engaging in random trial and error.

If anyone can identify any particular cell content beyond B4, and can show how you did it (aside from random trial and error), I will be impressed.