%chk=georgie_bh3_opt
%mem=6MW
%nproc=1
# opt b3lyp/3-21g geom=connectivity

BH3 optimisation

0 1
 B
 H                  1              B1
 H                  1              B2    2              A1
 H                  1              B3    3              A2    2              D1

   B1             1.50000000
   B2             1.50000000
   B3             1.50000000
   A1           120.00000011
   A2           119.99999978
   D1           180.00000000

 1 2 1.0 3 1.0 4 1.0
 2
 3
 4