It is a well-known insurance principle that the duty to defend is determined using the “Eight-Corners” method — comparing the four corners of the complaint to the four corners of the insurance policy. A federal court in Illinois recently maintained this principle and declined to extend coverage to an insured based allegations in the insured’s answer, limiting the analysis of the duty to defend only to the facts alleged in the complaint, and not the answer, unless “unusual circumstances” exist.
In the underlying complaint, the …
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