Best way Patton or the western allies could get some of Czechoslovakia, and be able to keep it, would be for the Germans to somehow delay the Russians in a way that the US, British, Canadians, and French would be forced to keep moving for a few more days. Maybe heavier resistance in Berlin results in heavier Soviet casualties, or maybe some German commander that has access to some mustard gas or something decides to use it in a last ditch attempt to stop the Soviets, which could possibly kill tens of thousands, or maybe even hundreds of thousands, and they have to pull troops and equipment from other areas, thus taking some pressure away from other German positions. If the US and British had to go more than little ways into the country, and got into a couple battles, I don't think it would play well politically for Truman and Churchill to send thousands, if not tens of thousands of men to fight to take over an area, only to give it up to the Soviets for free. Such an event might be bad for Eisenhower in the 1952 Presidential elections as well.