Beta, in an octahedral field, the d-orbitals split into two higher energy eg and three lower energy t2g orbitals, while in tetrahedral, it is reversed with three higher and two lower. The CFSE calculation uses 10Dq for octahedral and 4.45Dq for tetrahedral, but you must account for pairing energy if needed. I remember this like setting up weight plates—balance is key, and the formulas must be precise. These days, my own knees remind me that even strong structures, like crystal fields, have their limits under pressure.
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