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Fourth line invasion with one space on both sides
Path: InvasionItinerary · Prev: ErasureOrInvasion · Next: LowInvasionOfMixedThreeSpaceExtension
Keywords: MiddleGame, Joseki
This invasion often occurs in handicap games. The most aggressive answer is one of the a points. The contact play at b will establish a connection underneath and the contact play at c will connect on top of the invading stone. Those connections are good if Black is not strong enough to attack the invasion. The one-space jump of d is a flexible answer, attacking while defending. Many players make the mistake of playing c with the intention of connecting underneath, leading to the infamous Bermuda Triangle. A search in gobase shows that in professional games, the flexible answer at d and the territorial move at f are most often played. f has a follow-up at c, aiming at the connection underneath, without getting into the Bermuda triangle. [1] The aggressive approach
As a reference, let's look at this joseki. Black attacks from his weak side. White cuts with
...she will live locally while Black builds magnificent outward influence. Knowing this sequence and all its possible variations is usually good enough to reduce the handicap. [2] Connecting underneath
If Black wants to connect underneath, the line of play is to play
Usually, White cannot resist. Slayers will sometimes try to overawe their weaker opponents with this maneuver so Black must keep confidence and understand the strength of this position. [3] Connecting on top
After White's hane Black must cut at Charles Actually it is rather slow for White to connect here; especially in a handicap game. Dieter: Thanks Charles. Settling the shape (especially a ko) indeed favours the weaker player. Your hint may improve my winning percentage in high handicap games - oops, did I say that doesn't matter to me #:-7 ? Charles Some variations, assuming White plays tenuki
In a high-handicap game, White probably thinks like this. After
What about
Now White can't quite live: there are kikashi at a and b for White, but that isn't two eyes.
Therefore in this case the aji of One can say that if White doesn't connect immediately, it makes the game rather complex.
Same remark as in 2. Variation. Authors Path: InvasionItinerary · Prev: ErasureOrInvasion · Next: LowInvasionOfMixedThreeSpaceExtension This is a copy of the living page "Fourth line invasion with one space on both sides" at Sensei's Library. ![]() |