Solid connection
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is a solid connection. The black stones are physically connected, with absolutely no way for White to separate the stones.
here is a solid connection in the context of the 3-4 point high approach inside contact joseki. Black could also make a hanging connection at a, which would let him extend further down the left side, at the cost of some negative potential such as the peep at b. Either would be joseki.
Solid connection is also known in Japanese as pin-tsugi. here is a pin-tsugi, move 110 in the fourth game of the 40th Judan Title Match, with Takemiya Masaki playing white against O Rissei.
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