The specific application of Changxing nine-square grid formula method
Nine-Square Grid Formula: Unlock new skills in Sudoku
Sudoku, a popular intellectual game that has taken the world by storm, has fascinated countless players. And the nine-square grid formula method is a magic weapon to help us complete this game faster and more accurately. Today, I'm going to share this magic mantra with you!
Instructions:
- Get to know the nine-square grid: Divide the 4x4 board into three 9x2 squares, each with a 2x2 square. This helps us partition for inference and exclusion.
- Core mantras: Fill in the numbers 1 to 9 in each row, column and 9 square, and make sure that there are no duplicates. The mantra is "one deep dig, two shallow digs; Three syndromes do not panic". It's easy to remember and helps us sort out the mess of numbers.
- Apply the mantra: Suppose a row, column or nine-square grid, it is found that some numbers cannot have 1, 2 The vacancy range becomes smaller, but there are still one or two undetermined numbers left, which is the application scenario of "one deep digging" and "two shallow digging"; And when you determine a large number of numbers and suddenly encounter multiple possibilities and cannot be determined, it is the "three syndromes", and then you can use the elimination method or the unique remainder method to further reason.
Tips:
- Observation phase: Observe the whole first, start with the opening that can determine the least number, and lock it as soon as possible and rule out simple possibilities.
- Pairs: If you see a square with the same number and only one digit apart, the first choice is to exchange these two squares, which may bring a breakthrough.
- 3 around the count: The number of the same number around a space of 3 steps is an important hint of the probability of the number, and the impossible number is quickly eliminated after calculation.
More Sudoku solutions can be practiced and unlocked step by step, and the accuracy and speed of solving problems can be improved through continuous practice and summarization. If you have doubts or want to challenge a more difficult question, you can get a free Hidden Perk Card (click [here](https://172.lot-ml.com/ProductEn/index/228624771753f69b)), find more problem-solving strategies and guidance!
A small mantra goes a long way. Let the Nine Square Grid formula accompany you to open the door to the new world of Sudoku and enjoy the fun of thinking jumping!