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Step 5Xy-wing(This is an advanced technique )
he xy wing is the most difficult technique i have tried because its more difficult to spot it(and to teach :-)
You'll understand better if you check the pics. It works by removing candidates.
the values in the blue squares will be assigned an x,y,z according to the numbers. In this instructable x=8 ; z=2 ; y=9 The green square with the redlining around it is a buddy(in the same row,column or region) of the blue block with 8,9 and the blue block 8,2. and the 9,2 blue block is an buddy of the 8,9 and 8,2 blue blocks. This means that 8(which is also in the two blue buddy blocks). cannot be in the red lined block. If your not sure why check the next picture.
You'll understand better if you check the pics. It works by removing candidates.
the values in the blue squares will be assigned an x,y,z according to the numbers. In this instructable x=8 ; z=2 ; y=9 The green square with the redlining around it is a buddy(in the same row,column or region) of the blue block with 8,9 and the blue block 8,2. and the 9,2 blue block is an buddy of the 8,9 and 8,2 blue blocks. This means that 8(which is also in the two blue buddy blocks). cannot be in the red lined block. If your not sure why check the next picture.
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