$\displaystyle

f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({ v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}}

, v > 3

$

i have no idea how to create the UMVUE of $\displaystyle \theta$, and please help me , give me some tips.. thx