Invasion

    Keywords: MiddleGame

Chinese: 打入 (da2 ru4); 侵入 (qin1 ru4)
Japanese: 打ち込み, ウチコミ (uchikomi)
Korean: 침입 (chim-ip)

An invasion is a play made inside an enemy framework with the intention of living, escaping, or sacrificing. [1]

[Diagram]
Invasion example from a joseki  

If after Black's kosumi B2 White makes a three-space extension to W3, with the idea of having a good shape after the Black a-White b, exchange, Black instead plays an invasion B4.

See also 3453Enclosure43Invasion, Invasions on the side and 3-3 Point Invasion.

See also Invasion Itinerary.


Invasions occur throughout the game.

  • In the opening they are probably part of standardised joseki.
  • In the middle game they may be middlegame joseki, follow-ups in well-known positions, or just as likely occur as one player exerts the power of influence built up in an earlier fight.
  • In the endgame they can be considered as 'gouging' tactics (Japanese eguri?).

The difference between the second and third cases is that invasions in the middle game phase may create weak groups; which have no place in the endgame, where everything in theory is already settled in status and there is nowhere much to run.


A number of middlegame joseki exist for invasions into simple extensions and positions resulting from common "regular" (opening) joseki, but choosing the best point to invade often requires a fair bit of reading and positional analysis.

Some examples from games

  1. Invasion Professional Example 1
  2. Invasion Professional Example 2
  3. Invasion Professional Example 3
  4. Invasion Professional Example 4
  5. Invasion Professional Example 5
  6. Invasion Professional Example 6

Invasion lessons

Nick Sibicky 4d has a video lecture on invasions which was useful to me (13k):

  1. [ext] http://www.youtube.com/watch?v=_JcB785NVXE
  2. [ext] http://www.youtube.com/watch?v=ZmPSIGxlVvk

[1] Must the intention be to live or run out? What about invading with the idea of possibly sacrificing the invading stone depending on the defender's response? togo: Either of one or both, doesn't matter. Sacrifice is always a possibility and would sacrifice what you have, in this case an invasion with the prospect of living on its own, or running out.

GreenAsJade - if it's a sacrifice in enemy territory to get a response, then isn't that a probe, not an invasion. That might be the difference: invasion _does_ intend to live...

Bill: Nope. Sacrificial invasions are not uncommon.


Invasion last edited by 107.210.159.110 on February 26, 2017 - 21:34
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