![]() The candidates that occupy the lines can be spread across two of the blocks, and there can be several candidates in each line.Įxample by this technique. This is very similar to the Double Pairs technique, but is harder to see. This technique relies on spotting two pairs of candidates for a value and using these to rule out candidates from other boxes. So, even if you don't know exactly where to put the number yet, you can use this knowledge! If you look within a box and see that all candidates of a particular number lie along a single line, then you can eliminate all candidates on that line outside the box. This technique don't tell you where exact to place a number, but it eliminates candidates (pencilmarks). And usually, you will have then also a single candidate left, etc.Įxample by this technique. If you find a cell, you can also elimanate all possibilities for this number in the row, column and block. If you rule out all other possibilities for a particular cell, then the remaining candidate must fill the square. Single CandidateĪ very easy technique if you use pencilmarks to store candidates within each cell. Now, we can place the 8 in the remaining column. Where can you place a 7? Yes, at only one column, so we will place it. Where can you place a 8? Yes, at two columns, so we wait. ![]() This is the easiest, first and most used technique to apply.Ĭhoose a row, column or box, and then go through each of the numbers that hasn't already been placed.Įxample: Look at the highlighted line and find single positions.
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