Reverse Monkey Jump
Whereas a monkey jump involves jumping with a larger knight's move from the second to the first line, the reverse monkey jump, as the name implies, involves jumping with a large knight's move from the first to the second line, as in this diagram.
Jumpy monk literally reversing the term monkey jump is the humourous version of this term.
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Reverse monkey jump
1-2-3 principle applied
Reverse monkey jump twice
1-2-3 principle ignored
1-2-3 principle success
Sometimes, it is useful to realize that you can play a monkey jump in reverse, because you can descend to the first line in sente.
is sente against the corner. Black must defend with or the corner will die. After that, the reverse monkey jump destroys black's territory along the top.
and threaten to make ko of the corner. defends, after which destroys the base of the black stones, forcing them to run. See also: Threatening a ko
Quite often, it is better to forego the sente move that makes the reverse monkey jump possible, and instead play it directly, consistent with the 1-2-3 principle.
is an application of the 1-2-3 principle. A black move at a is sente against the corner, but black does not need to play it.
If white fails to realize that the descent is sente, and tries to cut off , the reverse monkey jump turns the whole corner into a ko.
If Black plays the descent in sente, it induces White to defend her corner, Black lose points here compared to playing directly, which leaves the possibility to play other endgame plays against the corner later.
Here, we see the success of the 1-2-3 principle. defends against further incursions into white's territory along the top. Black can then switch to the sente endgame in the corner, and can choose to play a when and if that becomes the biggest gote endgame move.
Some tsume-go that involve this tesuji: