This page concerns ways of referring to parts of the board when discussing the game on Sensei's Library.
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There are two conventions for giving directions:
- Relative - when discussing moves or the relative position of individual stones:
- Up = towards the center
- Down = towards the edge
- Absolute - when referring to positions on the board as a whole:
- Up or Top: Towards the white player
- Down, bottom, left, right, lower left etc.: Correspondingly - all as they appear to the Black player.
- This convention can cause confusion with the previous one (or when abbreviated - see below). To avoid this, sometimes points of the compass are used instead, with "North" replacing "upper side".
The board is loosely divided into nine areas.
- UL: upper left (corner or quarter) = NW
- TL: top left = NW
- UR: upper right = NE
- TR: top right = NE
- LL: lower left = SW
- BL: bottom left = SW
- LR: lower right = SE
- BR: bottom right = SE
- US: upper side = N side
- LS: lower side or left side (hence to be avoided) = S side or W side
- RS: right side = E side
There are several ways to refer to points on the board:
- Absolute coordinates. A1 is the left closest corner point for black. T19 right farthest. Absolute coordinates have the form x99, where
- x = Horizontal, a roman character A through T, I is skipped.
- 99 = Vertical, one of the numbers 1 .. 19
- Relative coordinates are measured from the closest corner. They are written in the form x-y, x and y both ranging from 1 to 10. The first point discussed has the smallest number first. E.g. a stone on the 3-5 point might be followed by one on the 5-3 point.
- Named points: Some points have names, such as "hoshi".
The lines are points on the board with a certain distance from the edge of the board.
- very low = second line (not first)
- no qualification = low = third line
- high = fourth line
- very high = fifth line (not sixth)
- contact = no space
- no qualification = close (approach) = small (enclosure) = one-space
- distant (approach) = large (enclosure) = two-space
- very distant = three-space
- pseudo (pincer) = four spaces (or more)
- Coordinates — An overview of many systems for assigning coordinates to points
- Named Points — A list of all points on the board with special names
Bob McGuigan: I think this usage comes from the desire to make it possible for people to discuss moves without using coordinates. In Japan in TV tournament games, for example, the game recorder announces moves in a fashion such as "upper right corner starpoint".
 Presumably because an uppercase 'I' may look like a lowercase 'l' in some fonts. As some software and notably the smart game format (SGF) doesn't skip the 'I', there is potential for misunderstandings.