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Daily Sudoku Answer 



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Jan 27 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s065693



Reasoning 



R7C2 can only be <1>

R7C4 can only be <2>

R8C2 can only be <6>

R4C2 can only be <4>

R9C2 can only be <8>

R3C7 is the only square in row 3 that can be <2>

R3C5 is the only square in row 3 that can be <1>

R4C3 is the only square in row 4 that can be <6>

R2C5 is the only square in column 5 that can be <6>

Squares R1C1 and R2C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C1 - removing <5> from <57> leaving <7>

R9C1 - removing <5> from <235> leaving <23>

R4C1 can only be <1>

R7C7 is the only square in row 7 that can be <7>

R5C4 is the only square in column 4 that can be <1>

R5C3 is the only square in row 5 that can be <7>

R4C4 is the only square in column 4 that can be <7>

Squares R6C1 and R6C3 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C5 - removing <3> from <3458> leaving <458>

R6C6 - removing <3> from <3458> leaving <458>

Squares R2C9 and R8C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C9 - removing <45> from <14567> leaving <167>

R4C9 - removing <5> from <58> leaving <8>

R6C9 - removing <45> from <14578> leaving <178>

R9C9 - removing <45> from <456> leaving <6>

R1C7 is the only square in row 1 that can be <6>

R1C9 is the only square in row 1 that can be <1>

R6C9 can only be <7>

R1C8 is the only square in row 1 that can be <7>

R6C7 is the only square in row 6 that can be <1>

R6C5 is the only square in column 5 that can be <8>

Squares R1C1 and R2C1 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C3 - removing <5> from <458> leaving <48>

R1C1 is the only square in row 1 that can be <5>

R2C1 can only be <9>

R3C8 is the only square in column 8 that can be <9>

Intersection of column 5 with block 5. The value <9> only appears in one or more of squares R4C5, R5C5 and R6C5 of column 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C6 - removing <9> from <349> leaving <34>

Squares R6C6 and R8C5 form a remote naked pair. <45> can be removed from any square that is common to their groups.

R4C5 - removing <5> from <59> leaving <9>

R5C5 - removing <4> from <349> leaving <39>

R9C6 - removing <45> from <3459> leaving <39>

R4C7 can only be <5>

R5C5 can only be <3>

R9C7 can only be <4>

R6C8 can only be <4>

R5C6 can only be <4>

R7C5 can only be <5>

R5C7 can only be <9>

R3C6 can only be <8>

R6C6 can only be <5>

R2C8 can only be <5>

R7C3 can only be <3>

R8C5 can only be <4>

R8C9 can only be <5>

R9C4 can only be <9>

R2C9 can only be <4>

R9C6 can only be <3>

R1C4 can only be <4>

R9C1 can only be <2>

R1C3 can only be <8>

R3C3 can only be <4>

R1C6 can only be <9>

R6C3 can only be <2>

R9C3 can only be <5>

R6C1 can only be <3>



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