Political warning: RankZero is (verrrry approximately :-)
the Julian Assange of OTB chess blogs, so don't go
if you are afraid of black helicopters. X-|
Use primary sauce http://kirr.homeunix.org/chess/3x4-chess/3x4c.cgi?metric=DTM&pos=wKb.pPrrNBkBN
then...but then you lose the possibility of finding the only winning of
the 4 legal moves. I played the solution on that site, it's hair-raising
and would deserve a "Study of the Year" consideration :-)