Anchor
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The Anchor extends its power perpendicular to the direction of the move
An anchor is an extension from one of a player's own stones, with an influence perpendicular to the direction of the extension.
Black 7 is a perfect example: it extends upward, away from the very stone (and ultimately group) it means to trap. But its influence extends horizontally trapping white on the right and passing on to two successive anchors on the left, black 9 and 11.