Reverse Monkey Jump

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.

Table of contents Situations in which it is used Applying the 1-2-3 principle Application in tsume go

Table of diagrams Reverse monkey jump Sente descent Sente hane-kosumi 1-2-3 principle applied Reverse monkey jump twice 1-2-3 principle ignored 1-2-3 principle success Search pattern

Situations in which it is used

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.

Sente descent  

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.

Sente hane-kosumi  

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

Applying the 1-2-3 principle

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.

1-2-3 principle applied  

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.

Reverse monkey jump twice  

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.

1-2-3 principle ignored  

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.

1-2-3 principle success  

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.

Application in tsume go

Some tsume-go that involve this tesuji:

• Beginner Exercise 143
• Gokyo Shumyo, Section 6, Problem 11

Search pattern  

unkx80: Did a search using the following pattern. Relevant results:

• 3-3 Point Invasion query 7
• Breaking Bad Habits / Discussion

Related problems:

• Xuanxuan Qijing Problem 209
• RTG Problem 38
• Gokyo Shumyo, Section 6, Problem 8 (move 5)
• Gokyo Shumyo, Section 6, Problem 11