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Competitive SAT In Discussion # 9 , we defined the problem COMP - 3 - SAT, where the input is a 3 - CNF on

Competitive SAT In Discussion #9, we defined the problem COMP-3-SAT, where the input is a 3-CNF on n boolean variables v1,dots,vn. Membership of in COMP-3-SAT is determined by a two-player game, where (in numerical order) White chooses the value of each odd-numbered variable, and Black chooses the value of each even-numbered variable. White wins the game if the resulting formula (v1,dots,vn) is true, meaning that every clause is satisfied by the choices of the vi's.
We would like you to prove that COMP-3-SAT is PSPACE-complete, which finishes the proof (using Discussion #9) that CFP is PSPACE-complete. It should be clear that COMP-3-SAT is very similar to the language TQBF in Sipser, particularly the version of it called FORMULA-GAME on page 343. There are two main differences:
The quantifiers in COMP-3-SAT strictly alternate between existential and universal, while those in FORMULA-GAME need not.
The quantifier-free part of COMP-3-SAT is a 3-CNF formula, while the quantifier-free part of FORMULA-GAME is an arbitrary boolean formula.
Prove FORMULA-GAME ?p COMP-3-SAT.
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