Probe

  Difficulty: Advanced   Keywords: Strategy, Go term

Chinese: 试应手 (試應手) (shi4 ying4 shou3)
Japanese: 様子見 (yosu-mi)
Korean: 응수타진 (eungsutajin)

A probe is a play made in order to see how the opponent reacts. After a probe, the opponent must choose between usually two or three options. The response should then help you decide on an appropriate course of action elsewhere.

Mr. Yang Yilun, famous teaching pro, uses the term asking move (a direct translation from the Chinese: 问应手). Probes usually ask the opponent to make a choice, say between inside territory or outside influence, which allows you to decide your strategy accordingly.


Simple example

[Diagram]
 

The probe B1 asks White "On which side do you want to make territory". Then B3 says: "Oh this side? Well you can't have it."

Note that White would love to play at a if Black didn't play 3, to make a huge corner. Black will later still have either b or c to deal with the upper right.

[Diagram]
 

If white chooses the other side, then B3 denies him too much territory there. Again, White would love to play a move like a to finish the corner, if Black didn't play B3. And moves b and c are available to limit the potential of the upper left.

So by making the opponent choose a side first, Black is able to play the proper invasion based on that information.


Another example

[Diagram]
 

Here B5 is a common probe. White usually replies at a or b. See Probing during the attach and draw back joseki for a full treatment.

[Diagram]
 

If you don't play the probe, but finish the joseki first, W8 is a good move that threatens to invade at a while strengthening the corner.

[Diagram]
 

If White responds to the probe with W6, then after B9 the situation is better for Black, because the invasion at a is no longer severe.

[Diagram]
 

If White responds with W6, then Black can choose the sequence up to B9, which doesn't leave the same invasion that the hanging connection would. Also, White's corner is now more vulnerable than after W6 at a.

[Diagram]
 

If Black forgoes the probe, and plays the solid connection sequence immediately, then White will play W8 like this, and there is an invasion at a later.

So effectively, the probe is asking White to choose a move in the upper left first. Black can then determine the proper line of play in the upper right based on that extra information.


Classical Shimari Probe

[Diagram]
Classical example of a probe  

Possible local answers for Black range from a to d.

See 2-4 Probe against a low corner enclosure for further analysis.

See also


Probe last edited by OscarBear on December 30, 2016 - 09:54
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