Consider three interpretations of Last Resort, adapted from literature. (20) α can target K only if a. a feature of α is checked by the operation; b. a feature of either α or K is checked by the operation; c. the operation is a necessary step toward some later operation in which a feature of α will be checked.
- Chomsky (1995), a pag.256-257

[…] Last Resort. Move F to target K only if F enters into a checking relation with a sublabel of K.
- Chomsky (1995), a pag.280