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Daily Sudoku Answer 



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Dec 01 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C4 can only be <3>

R6C8 can only be <4>

R1C5 is the only square in row 1 that can be <5>

R3C3 is the only square in row 3 that can be <9>

R4C5 is the only square in row 4 that can be <6>

R6C5 is the only square in row 6 that can be <3>

R7C9 is the only square in row 7 that can be <9>

R5C4 is the only square in row 5 that can be <9>

R4C4 can only be <8>

R4C8 can only be <9>

R8C9 is the only square in row 8 that can be <3>

R1C7 is the only square in row 1 that can be <3>

R9C3 is the only square in row 9 that can be <3>

R9C2 is the only square in row 9 that can be <9>

Squares R3C5 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <47> from <1247> leaving <12>

R3C9 - removing <47> from <1247> leaving <12>

Squares R5C7 and R5C9 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C1 - removing <7> from <1257> leaving <125>

R5C5 - removing <7> from <147> leaving <14>

R5C6 - removing <7> from <12457> leaving <1245>

R3C5 is the only square in column 5 that can be <7>

R3C7 can only be <4>

R2C6 can only be <4>

R5C5 is the only square in row 5 that can be <4>

R5C7 is the only square in column 7 that can be <7>

R5C9 can only be <8>

R9C9 is the only square in column 9 that can be <4>

R9C8 is the only square in row 9 that can be <2>

R8C8 is the only square in block 9 that can be <1>

Squares R8C4 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C1 - removing <5> from <458> leaving <48>

R8C2 - removing <5> from <458> leaving <48>

R6C2 is the only square in column 2 that can be <5>

R6C4 can only be <2>

R6C6 can only be <7>

R8C4 can only be <5>

R4C6 can only be <1>

R8C6 can only be <2>

R4C2 can only be <7>

R5C6 can only be <5>

R2C2 is the only square in column 2 that can be <1>

R2C9 can only be <7>

R3C1 can only be <2>

R1C9 can only be <2>

R3C9 can only be <1>

R5C1 can only be <1>

R1C3 can only be <6>

R5C3 can only be <2>

R1C8 can only be <8>

R7C3 can only be <1>

R2C1 can only be <8>

R1C2 can only be <4>

R2C8 can only be <6>

R8C1 can only be <4>

R9C1 can only be <5>

R7C5 can only be <8>

R7C7 can only be <5>

R9C5 can only be <1>

R7C1 can only be <6>

R9C7 can only be <8>

R8C2 can only be <8>

R1C1 can only be <7>



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