From the theologyonline debate, Does God Know Your Entire Future:

Therefore, Sam, if you show evidence that God told Moses that He would part the Red Sea, and He then did so, that would not qualify as a proof-text for exhaustive foreknowledge, but as a proof-text for God intervening in history. Theoretically your position can win with scriptural evidence that God knows everything that will ever happen, or that He knew us before we were conceived, or that He exists in the future, etc. But you cannot win the debate simply with evidence that God has plans, or that He intervenes, or that He knows the past or present, since we all agree that God does things, and knows things.

God decided in His time that He would pick a ruler, and name and empower him to do His bidding. The Open View doesn’t teach that God lacks competence and ability. He is not less competent and capable than FDR. We, after all, are the ones who teach that God can and does change what would otherwise occur in the future, including by influence, and by direct action. (But influence cannot violate anyone’s will, since that is impossible by definition, see BEA-SLQ3.) So as with the kinds of biblical examples offered by the Settled view, God prophesying something that He can do or bring about by influence cannot be proof of exhaustive foreknowledge, just as FDR’s committed effort toward the Allied victory does not prove him omniscient of the future. These Isaiah passages do not speak about omniscience, but about God’s ability to accomplish goals.