That’s the link to the game. The move I need to understand is White Number 12. Black to play. I don’t know how to move against that move while still having all in favor, or doing the proper joseki, since I don’t see the balance for both sides.
This is called the monkey jump. It is explained in details on this page:
http://senseis.xmp.net/?SaruSuberi
Always a bad surprise the first time someone plays it against you 
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thanks a lot!
That was an interesting application of it eh!
A “Double-jump-into-the-opposite-corner-burning-the-bridge-behind” !!
Fun fact, the Chinese name for it, 大伸腿, literally means big leg stretch 
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I wondered if it was a “thing”.
very well said, indeed. 
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Yeah, I’ve found gnugo spams the monkey jump like crazy
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