"Mr. Tenuki" is an SDK  player. If you're looking for this user, we're sorry to tell you that it's not possible to reach him right now, because he has just played an off-server tenuki.
(In case you're wondering... no, "Tenuki" is obviously not his real last name, as he is not of Japanese descent-- rather, the user name was chosen because of his preference for playing tenuki when possible.)
 On KGS, his peak strength in 2007-2008 was around 3k; however, an exact rank cannot be given as he hasn't played Go much since then. He does make minor edits to SL pages from time to time and occasionally log into KGS to observe games, though.
September 6, 2011
Velobici Thank you very much for correcting my translation errors. Much appreciated. Still have a lot to learn!
MrTenuki: No problem-- your first draft was actually pretty good already (probably better than how I might have attempted it myself, in my opinion). My edits were really more about improving the translation rather than correcting "real" mistranslations (I don't think any of the errors were severe enough to give the reader the wrong general idea).