/[gnugo]/gnugo/patterns/conn.db
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revision 1.33 by bump, Thu Jan 2 00:23:29 2003 UTC revision 1.34 by bump, Tue Jan 28 18:27:42 2003 UTC
# Line 1483  Xaf Line 1483  Xaf
1483  # CC5xx - experimental connection patterns  # CC5xx - experimental connection patterns
1484  #  #
1485  ####################################################################  ####################################################################
1486    #
1487    # Note about patterns CC501, CC502, CC502b, CC511
1488    #
1489    # In theory, these patterns go against the connection policy that the
1490    # involved strings must be tactically stable (not capturable) and
1491    # consequently, they should not be needed at all. In practice though,
1492    # problems arise with the optics/owl analysis when such strings aren't
1493    # amalgamated. An example (see owl:50)
1494    #
1495    # +------
1496    # |...X.O
1497    # |XXX.XO
1498    # |.OOXXO
1499    # |O.OOOO
1500    #
1501    # In the absence of the mentioned patterns, the topmost X stone would
1502    # NOT be amalgamated with the others, because all attempts at
1503    # defending these kosumi connections result in a tactical capture of
1504    # the whole string, thus a successful cut.
1505    #
1506    # As a consequence, the owl code would be run against separate targets,
1507    # and in the above case, it would even fail to find a way to kill the
1508    # topmost X stone (the lack of context is then responsible for the
1509    # optics/owl code not being able to return vital points)
1510    #
1511    ####################################################################
1512    
1513    
1514  Pattern CC501  Pattern CC501
1515  # Connect even if stones not tactically safe.  # Connect even if stones not tactically safe.

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