Kropki (GM[40])
As Kropki is very similar to Go, most of the conventions for
Go remain valid.
The main difference is that in Kropki there is an additional move:
'stop'.
In Kropki the Stone (in Kropki called 'dot') becomes Point and
it consists of two letters. For Kropki it is important to have boards
larger than 26x26 (30x30 is one of the most popular), hence we use
both lowercase and uppercase letters, see below.
![[coordinates (TA2.gif)]](images/TA2.gif)
Coordinate system for points
The first letter designates the column (left to right), the second the row
(top to bottom). The upper left part of the board is used for smaller
boards, e.g. letters "a"-"m" for 13*13.
Using lowercase letters only the maximum board size is 26x26.
In FF[4] it is possible to specify board sizes upto 52x52.
In this case uppercase letters are used to represent points from 27-52,
i.e. 'a'=1 ... 'z'=26 , 'A'=27 ... 'Z'=52.
(Note that there should be NO sgfs prior to FF[4].)
Moves without a stop are encoded just as in Go, for example W[ab]
means that White puts a dot on the point 'ab'.
Stops are encoded by a dot and then a sequence of points that form the
border
of the stop, with the end point the same as the start point. Examples:
- W[ce.cecfdgefdece] -- white puts a dot on 'ce', and a stop is made
with border at points 'ce', 'cf', 'dg', 'ef', 'de', 'ce'. Note that
although
typically the stop would belong to the White player, one should not
assume that. Instead, the reader should take the colour of the
dots at points in the border of the stop (e.g. the dot at 'ce').
Here the stop will be white, as at 'ce' there will be the white
dot played in this move.
- W[.cecfdgefdece] -- as above, but just stop, without placing a dot
(may be allowed in some rulesets)
- W[gg.cfdgefdecf.ggghhiihjgifhfgg] -- similarly as before, but now
two stops are made in one move.
A sequence of points encoding the stop should satisfy the following
conditions:
- It should have no self-intersection, that is, each point in the
sequence
should occur only once, with the exception for the starting and ending
points, which are the same.
- On all points on the sequence there should be dots of the same
colour.
The stop sequence is the dot '.' followed by the sequence of points as
above. Example: ".cecfdgefdece".
Note that TW and TB may be used in two ways: as in Go, or in a
Kropki-specific manner.
When used as in a Go, TW and TB points must be unique, i.e. it's illegal to list the same point
in TB and TW within the same node.
Property: TB
Propvalue: elist of point
Propertytype: -
Function: Specifies the black territory.
Points must be unique.
This is the way of using TB as in Go, unused yet.
Related: TW
Property: TB
Propvalue: at least one stop sequence
Propertytype: -
Function: Specifies the border(s) of black pools.
This is the Kropki--specific way of using TB.
Example: TB[.cfdgefdecf.ggghhiihjgifhfgg]
Related: TW
Property: TW
Propvalue: elist of point
Propertytype: -
Function: Specifies the white territory or area (depends on
rule set used).
Points must be unique.
This is the way of using TB as in Go, unused yet.
Related: TB
Property: TB
Propvalue: at least one stop sequence
Propertytype: -
Function: Specifies the border(s) of white pools.
This is the Kropki--specific way of using TW.
Example: TW[.cfdgefdecf.ggghhiihjgifhfgg]
Related: TB