For example, in a row of ten cells with only one clue of 8, the bound block consisting of 8 boxes could spread from This method uses conjunctions of possible places for each block of boxes. Simple boxesĪt the beginning of the solution, a simple method can be used to determine as many boxes as possible. This works on searching for contradictions, e.g., when a cell cannot be a box because some other cell would produce an error, it must be a space. More difficult puzzles may also require several types of "what if?" reasoning that include more than one row (or column). Many puzzles can be solved by reasoning on a single row or column at at a time only, then trying another row or column, and repeating until the puzzle is complete. The picture may help find and eliminate an error. The hidden picture plays little or no part in the solving process, as it may mislead. An error sometimes comes to the surface only after a while, when it is very difficult to correct the puzzle. If guessing is used, a single error can spread over the entire field and completely ruin the solution. Cells that can be determined by logic should be filled. Solvers often use a dot or a cross to mark cells they are certain are spaces. To solve a puzzle, one needs to determine which cells will be boxes and which will be empty. Some of the steps of the process are grouped together.
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