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Liu Gongge formula Sudoku
Implicit uniqueness method of rows: when there are only two spaces in a row, look at the columns and houses related to these two spaces. If there are possible numbers in these two spaces, determine the numbers in these two spaces.
There are only two spaces in the fourth row, including 4, 5, 3 and 1, so these two spaces can only be 2 and 6. Looking at the columns and palaces in these two spaces, we find that there are 6 in the third house, so the space in the fourth row of the third house can't be filled with 6, only 2, and the fourth row and the fourth column only have 6.
Column implicit uniqueness method: when there are only two spaces in a column, look at the rows and houses related to these two spaces. If there are possible numbers in these two spaces, determine the numbers in these two spaces.
There are only two spaces in the second column, including 6, 3, 2 and 4, so these two spaces can only be filled with 1, 5. Looking at these two spatially related rows and houses, we find that the number 1 appears in the second row of the first house, so the second row of the second column can't be 1, but only 5, so the third row of the second column can only be 65433.
Palace implicit uniqueness method: when a house has only two spaces, look at the rows and columns related to these two spaces. If there are possible numbers in these two spaces of row and column, determine the numbers in these two spaces.
There are only two spaces left in the fourth house, and there are 3, 6, 5 and 4, so these two spaces can only be 1, 2. Looking at the rows and columns related to these two spaces, we find that the third row has 1, so the third row and the fourth house can't be 1, but only 2, so the fourth house and the fourth row are 1.
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