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4435 enclosure
Keywords: Opening
The assumption is that this is made from the initial 4-4 point.
Starting from the 3453 enclosure, Black 2 after White 1, rather than Black a, is possibly too steady (though one can hardly call it a mistake - it's one possible answer to this as middlegame joseki). This accounts for White's willingness to force Black in the reduction sequence.
If Black reacts on the other side to the marked play, White gains life in the corner.
This formation may arise from the 4435 enclosure, usually with at least one white stone at a or b. It is known as the Three Crows. This is a copy of the living page "4435 enclosure" at Sensei's Library. ![]() |