Maruseru/ Splitting AThree Point Extension

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When the opponent has overextended stones, you should invade. It is usually more effective to attack than to make territory somewhere else and letting the opponent stabilize himself.

Initial setup  

Diagram 1: 1-2  

: White can invade the overextended black stones.

: A normal response.

Variation 1 at move 1 in Diagram 1: 1  

: If Black gets to play here, this is the best move.

Variation 2 at move 2 in Diagram 1: 1  

: A normal response.

Variation 3 at move 2 in Diagram 1: 1-8  

: This is not a good move.

: Black is separated.

: Black cannot connect.

Variation 4 at move 2 in Variation 3: 1-6  

: This nozoki is not good.

: Black has this tesuji to connect his stones.

Variation 5 at move 3 in Variation 3: 1  

: This is another idea.