It may not sound like much, but wait till you see it in action.
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These are NOT a KO! While you are recapturing with a stone that just got captured, the game position is different and your opponent has no chance of capturing back.
With snapback, it is often the case of getting an edge by threatening to create a snapback rather than actually snapping back. Either way, try to look for those in your games. They are not as uncommon occurences as you might think.