(click here for rules)
Technique 4 :
Block and column / Row Interaction
This method won't help you pencil in any new numbers, but it will help you nail a number down within a specific row or column. The example shows that the number 7 can only be inserted in the red cells of the middle row. Thus you can remove 7 as a possible candidate from the rest of the row.
Block / Block Interaction
This technique is best understood by looking at the example. In the middle and the middle-right blocks, the number 8 must be placed in one of the red cells. This means, we can eliminate 8 from the upper and lower rows in the middle-right column.
(click here for rules)
Technique 4 :
Block and column / Row Interaction
This method won't help you pencil in any new numbers, but it will help you nail a number down within a specific row or column. The example shows that the number 7 can only be inserted in the red cells of the middle row. Thus you can remove 7 as a possible candidate from the rest of the row.
Block / Block Interaction
This technique is best understood by looking at the example. In the middle and the middle-right blocks, the number 8 must be placed in one of the red cells. This means, we can eliminate 8 from the upper and lower rows in the middle-right column.
(click here for rules)
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