%chk=631SM
#RHF/6-31G* OPT=Z-matrix MP2
 
BH3
 
   0   1
 X
 B,1,1.0
 H,2,R3,1,120.3884
 H,2,R3,1,120.3884,3,120.0
 H,2,R3,1,120.3884,3,-120.0
      Variables:
 R3=1.1