I tossed it at Sudoku Susser, which is excellent at defining logical steps. Turns out this is an XY-wing example. * Squares R4C1 (XY), R6C3 (XZ) and R4C9 (YZ) form an XY-Wing pattern on <9>. All squares that are buddies of both the XZ and YZ squares cannot be <9>. R4C2 - removing <9> from <39> leaving <3>. R6C9 - removing <9> from <49> leaving <4>. --Ed Pegg Jr --- Richard Guy <rkg@cpsc.ucalgary.ca> wrote:
Can some of you sudoku experts comment on the following query? Thanks in anticipation. R.
Here is a Sudoku 'almost' finished that still needs a 'guess' (I think)
367|.4.|592 952|376|418 814|259|637 ----------- ..8|62.|75. 5.6|49.|281 .2.|.85|36. ----------- 643|912|875 ...|.34|926 2..|.6.|143
Can you complete without a guess to eliminate an option?
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