Tsirelson's bound on the CHSH operator follows from ∣⟨B⟩∣≤4+⟨[A0,A1]⟩⟨[B0,B1]⟩, where A0,A1 and B0,B1 are dichotomic (±1) observables. For ideal anticommuting observables each commutator has operator norm 2, so the product term is 2⋅2=4. What is the resulting maximum ∣⟨B⟩∣?