小目
小目是圍棋棋盤上第三線和第四線的交叉點，一個角落有兩個，整個棋盤中共有八個位置稱作小目。（如以棋盤左上角作(1,1)算起，這八個點的座標位置分別是(3,4)(4,3)(3,16)(4,17)(16,3)(16,17)(17,4)(17,16)）
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小目因為兼具第三線的重視實利以及第四線重視外勢的兩個優點，因此成為圍棋開局佔角時經常下的位置。在19世紀及以前的日本圍棋比賽中，因較重視實利，因此大多數的開局都是以佔小目開局，（當時的中國圍棋規則是採用星位的座子，因此不可能先佔小目）尤其秀策流布局，更是以執黑先下時，連佔三個角的小目而著名。
20世紀上半葉，受新布局觀念的影響，大家開始較為重視外勢，因此佔角時下在星位，甚至目外、高目的情形變多。根據統計，近年來的棋賽中，先佔星位和小目的比例大致相當。
雖然小目和星位在現代圍棋中同樣受到重視，但星位因為左右對稱，因此佔角、掛角之後的變化較為簡單，而小目的變化較為複雜，也因此現今所有的定式中，小目定式的數量最為龐大而複雜。
张栩定式
小目高挂一间低夹托退后直接拆二的下法，是由张栩最早普及的，被称之“张栩定式”。这手棋也被现代AI所认可。
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