The Confrontation

Ehud and Benjamin are participating in a public confrontation. Each presents, in turn, a question to their opponent. Ehud is chosen to be the first to present a question. A "tricky question" is a question for which the opponent has no answer. A contestant who manages to ask a tricky question immediately wins the confrontation. The probability of each of the two contestants finding (in turn) a tricky question is exactly 1/2. It is also known that there is no dependence between the questions. What is the probability of Ehud winning the confrontation?