Can the two ends of an XY chain inhabit the same box and validly eliminate one or more candidates in that box?
A post on this forum from 2005 stated that an XY chain "has more than four cells" - should this be corrected to "four or more cells"?
ronk wrote:For many people, the length is the "loop length" which includes the elimination cell of a discontinuous "nice loop"
caraemily wrote:Can the two ends of an XY chain inhabit the same box and validly eliminate one or more candidates in that box?
This is odd for me. An xy-chain (or wing) can eliminate up to 4 candidates. Then such an xy-wing would be a xy-chain of length 7 ?ronk wrote:For many people, the length is the "loop length" which includes the elimination cell of a discontinuous "nice loop".
eleven wrote:This is odd for me. An xy-chain (or wing) can eliminate up to 4 candidates. Then such an xy-wing would be a xy-chain of length 7 ?ronk wrote:For many people, the length is the "loop length" which includes the elimination cell of a discontinuous "nice loop".
. xz . | * xy *
* * * | yz . .
. . . | . . .
Steve R wrote:So ... (xy) – (yz) - (zt)
is not a chain.