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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For HBNH (Boranimine)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL -0.000764 -0.003046 -0.003046 -0.002476 -0.008742 -0.009134 -0.009374 -0.036300 -0.036598 -0.017181 -0.043144 -0.033382 -0.004347 -0.027868 -0.054875 -0.005574 -0.033474 -0.056134
MP3=FULL         -0.008685   -0.009347       -0.045127 -0.035120 -0.004116 -0.028857        
MP4=FULL   -0.002946     -0.008733       -0.038435   -0.045523   -0.004110 -0.028951   -0.005348 -0.035086  
B2PLYP=FULL -0.000233 -0.000916 -0.000916 -0.000745 -0.002608 -0.002722 -0.002795 -0.010417 -0.010510 -0.005032 -0.012455 -0.009586 -0.001302 -0.008155   -0.001677 -0.009751  
Quadratic configuration interaction QCISD(T)=FULL         -0.008721           -0.045479   -0.004090 -0.028951   -0.005334 -0.035078  
Coupled Cluster CCSD=FULL         -0.008617         -0.017555 -0.045037 -0.035116 -0.004029 -0.028705 -0.057364 -0.005275 -0.034798 -0.058710
CCSD(T)=FULL         -0.008722           -0.045470 -0.035328 -0.004091 -0.028958 -0.057937 -0.005336 -0.035082 -0.059282
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ