>>From: Heikki Levanto [EMAIL PROTECTED] >> I don't see any reason why [C4] should be harder to read than [cd]. Not for >> humans, and not for computers. For computers, C4 and CD are equivalent. For humans, C4 is slightly easier to process, since this is a common coordinate system used by many in "Real Life" (tm). Many people also use the "3-4" coordinate system which has obvious problems if condensed to "34" on a 19x19 board. >From: Phil G <[EMAIL PROTECTED]> >Actually, C4 is not [cd]. C4 is actually [cf] on a 9x9 board. It's something >else on a 19x19 or 13x13 >board. The row character depends on the board size. >SGF coordinate for a row are labeled top to >bottom. Go boards are exactly >opposite. In my opinion, it is SGF that uses a non-standard coordinate >system >to represent positions on a Go board. Because the go board is symmetrical, C4 and CD are equivalent when placed in the internal board of a computer program. It is how you display this board relative to the internal representation which determines if it looks "backwards". >As a community, I believe we can improve SGF by extending the specification >slightly to allow points to >also be encoded in "standard" coordinates and >depreciated, admittedly slowly, the use of the old >coordinate system. We >already see Go programs (SmartGo, GoGui and others) supporting this format. >>Maybe this can be a key point in the proposed FF[5] specification. The GTP protocol does use the C4 coordinate system. So most GUIs and engines are likely to support both somewhere in the code. The main problem with changing the SGF standard now is the thousands of existing SGF files and utilities which will never be updated. At most, I think people could include support for reading both coordinates, but converting SGF to the "new" standard will break SGF for some. Ben. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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