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Calvin: I was wondering how many people have either used this tesuji or had to defend against it in their own games.
I think it'd be more interesting to see how many times they missed when it could be used.
I think it is more a matter of how many times is it avoided. It probably only occurs in one out or a hundred or two high level games, but the possibility of it happening (and defended against) occurs much more frequently.
With the exception of nakade and snapback, I don't think I have ever had an under the stones play in one of my games. However, as Dr. Straw indicated, the possibility of an under the stones tesuji does come up from time to time, as both my opponents and I are normally aware. (It is possible that we both overlooked something, OC.) As I recall, one came up in a life and death situation last month, in fact.
I was messing around with Igowin this morning. I was just playing moves so not reading more than a couple of moves ahead. Playing it at professional level it quite clearly was reading further ahead than I -- it saved a group using exactly this technique, and in the process killed all my stones.
Just last week at my local club I had a situation where I could tenuki because I could use this tesuji to get an eye. It didn't happen, because it was the end game and protecting was actually the biggest move, but it had to be considered.
Xezlec: I'm a meager 19k but I make weird plays that other people think are stupid (they're usually right). I've definitely made at least one successful under-the-stones play (among many doomed, hopeless attempts that made my opponents look at me like I was from Mars). I think most people just "aren't stupid enough" to even try playing inside what looks like an opponent's turf.