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- Newsgroups: rec.games.go
- Path: sparky!uunet!comp.vuw.ac.nz!canterbury.ac.nz!math!wft
- From: wft@math.canterbury.ac.nz (Bill Taylor)
- Subject: Re: FWD: GO RULES FOR BEGINNERS
- Message-ID: <C1JBv0.8FE@cantua.canterbury.ac.nz>
- Nntp-Posting-Host: sss330.canterbury.ac.nz
- Organization: Department of Mathematics, University of Canterbury
- References: <9301221630.AB00981@enet-gw.pa.dec.com> <1993Jan26.090932.46768@kuhub.cc.ukans.edu>
- Date: Wed, 27 Jan 1993 22:59:24 GMT
- Lines: 37
-
- >Barring seki and handicaps, japanese and chinese scoring can never
- >differ by more than one point.
-
- Just a tiny nit-pick here. This statement is not quite true, (even ignoring
- those weird multi-move repeaters that never occur in real games).
-
- A 1-point ko left till the end of the game can actually lead to a
- 2-point difference in scores. This is not all that uncommon. An example...
-
- X O . O . Just a 5x5 game to illustrate. X & O each have 9 stones on board.
- X X O O . It is X to play, (so prisoners are equal).
- . X X O O
- X X X O . X will take the top-edge ko and win it.
- . X O O .
-
- Japanese score: X 2+1 prisoner = 3; O 4. O wins by one point.
-
- Chinese score: X 13; O 12. X wins by one point.
-
- Amazingly, if there are an even number of dame, filling in a dame is good as a
- ko threat ! In the example, let the bottom centre stone and the one above it be
- missing. Then when X takes the ko, O can fill one of these dame as a threat. If
- X ignores & takes the ko, O will still win by one (in Chinese). As he will if X
- "answers" by taking the other dame. (And if X filled a dame first, O would fill
- the ko and win by one point anyway.)
-
- This "anomalous value" of an end-game ko is often adduced as evidence against
- the reasonableness of Chinese scoring, though I personally have never seen it
- that way. I think it is a delightful extra wrinkle in end-game tactics, no
- different from any other odd little 1-or-2 point battle.
-
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- Bill Taylor wft@math.canterbury.ac.nz
- ------------------------------------------------------------------------------
- No, I'm *not* cheating my employer by spending 3 hours a day on the net.
- I'm just using the time I would have spent on chess problems and solitaire.
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-