| This technique is a very common way of starting a game. It is a static technique, which means that we can use this rule regardless of which cells we may have painted (set) or circled, as it depends only on the given numbers on the board. |
Look for any two occurrences of a single number, seperated by a single cell.
The logic of the game suggests that at least one of the occurrences must be painted (set), otherwise there would be more than one occurrence of the number in the row or column, violating the first rule of the game.
If at least one of the cells is painted (set), then using the Set Circle technique, we know that all adjacent cells must be painted. Although we don't know which of the two occurrences will be painted, the cell 'sandwiched' by the two numbers must be white and it is circled. |
