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You are absolutely right about one thing. Every time I've seen it happen, there is a very small number of free candies at the start of the board and the original 'setup' is done so that making a single switch move will clear blockers to allow candies to fall into this area so that more matches can be made(next to a single pop rock or a single string block or similar that only requires one match made beside it to 'break' or 'clear'. Usually the starting candy configuration allows a switch of three candies to form a single line against the blocker so that these are cleared, but if a starting booster changes one (say to a color bomb), even using the color bomb to clear the other two candies don't 'break' the blocker because it requires an actual match made beside it. The same thing happens if the candies that were set up to be switched to trigger the break are switched to fish, then switching the fish sends them randomly elsewhere on the board and no more can fall into the space.