Specific application of Nanjing nine-square grid mantra method
Nine-square grid mantra: Unlock new skills in Sudoku
Sudoku, this popular mind game around the world, has fascinated countless players. The nine-square grid formula method is the magic weapon that helps us complete this game faster and more accurately. Today, I will share this magical mantra with you!
Steps:
- Know the nine-square grid: Divide the 4x4 board into three nine-square squares, each of which is a 2x2 square. This helps us to reason and exclude partitions.
- Core mantra: Fill in the numbers 1 to 9 in each row, column and each square and make sure not to repeat it. The mantra is "one digs deep, the other digs shallowly; 3. Syndrome does not panic". This is simple and easy to remember, helping us sort out the clutter in the mixed numbers.
- Apply the mantra: Suppose that in a row, column or nine-square grid, it is found that some numbers cannot have 1, 2 The vacancy range has become smaller, but there are still one or two undetermined numbers left, which is the application scenario of "one deep digging" and "two shallow digging"; When you suddenly encounter multiple possibilities and cannot be determined after determining a large number of numbers, it is the "three syndromes", which can be further reasoned using the exclusion method or the unique remainder method.
Tips Sharing:
- Observation phase: First observe the overall situation, start with the opening and filling that can determine the minimum number, and lock in as soon as possible and rule out simple possibilities.
- Pairs: If you see a square grid where both squares have the same number and are only one digit apart, the first choice is to communicate and test these two squares, which may bring a breakthrough.
- 3. Count around the count: The number of identical numbers around a distance of 3 steps around a certain space is an important hint of numerical possibilities, and the impossible number is quickly eliminated after calculation.
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A small mantra, a big help. Let the nine-square grid mantra method accompany you to open the door to a new world of Sudoku and enjoy the fun of thinking jumping!