A move in direct contact with a friendly stone. This is not a push.
A downward stretch is called sagari.
A move with two ways to directly get contact with a friendly stone.
The two stones are on different lines.
Typical use: connect, move out, attack, answer to keima
Proverb: Answer keima with kosumi
The two stones are on the same horizontal or vertical line and have exactly one space between them.
Typical uses:
Proverbs:
Both kosumi and ikken tobi are at a distance of one space. Both need one move only to make a solid connection. Because there are two ways to do that with kosumi and only one with ikken tobi, the kosumi is more solid.
The two stones are on different lines and have two spaces between them.
Typical uses:
Proverbs:
The two stones are on the same horizontal or vertical line and have exactly two spaces between them.
Typical uses:
Both keima and niken tobi are at a distance of two spaces. Both need at least two moves to make a solid connection. Because there are three ways to do that with keima and only one with niken tobi, the keima is more solid.
Both oogeima and hazama tobi are at a distance of three spaces. Both need at least three moves to make a solid connection. There are four ways to do that with oogeima and even six with hazama tobi. However four of those six go over a. This makes a, the hazama (hole), a weak point. Oogeima does not have such a weak point. It is more solid. .