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Daily Sudoku Answer 



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Jan 04 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s299621



Reasoning 



R6C6 can only be <4>

R7C6 can only be <8>

R7C4 can only be <1>

R4C6 can only be <3>

R9C5 can only be <3>

R8C5 can only be <4>

R2C5 is the only square in row 2 that can be <8>

R5C2 is the only square in row 5 that can be <3>

R8C3 is the only square in row 8 that can be <3>

Squares R4C3 and R4C5 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C4 - removing <5> from <578> leaving <78>

R4C7 - removing <5> from <578> leaving <78>

Squares R6C4 and R6C7 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C3 - removing <5> from <156> leaving <16>

R6C5 - removing <5> from <156> leaving <16>

Intersection of column 2 with block 1. The values <46> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R3C3 - removing <6> from <12569> leaving <1259>

Intersection of column 3 with block 1. The value <9> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C1 - removing <9> from <2579> leaving <257>

R2C1 - removing <9> from <12579> leaving <1257>

R1C8 is the only square in row 1 that can be <9>

R2C3 is the only square in row 2 that can be <9>

R9C1 is the only square in row 9 that can be <9>

R8C7 is the only square in row 8 that can be <9>

R9C9 is the only square in row 9 that can be <2>

R7C3 is the only square in row 7 that can be <2>

R4C7 is the only square in column 7 that can be <8>

R4C4 can only be <7>

R6C4 can only be <5>

R6C7 can only be <7>

R3C4 can only be <9>

R4C5 can only be <6>

R3C6 can only be <2>

R5C4 can only be <8>

R5C6 can only be <9>

R1C5 can only be <5>

R4C3 can only be <5>

R6C5 can only be <1>

R6C3 can only be <6>

R5C5 can only be <2>

R3C3 can only be <1>

R5C1 can only be <1>

R8C1 can only be <7>

R8C9 can only be <6>

R1C1 can only be <2>

R7C2 can only be <5>

R8C8 can only be <8>

R1C9 can only be <7>

R2C1 can only be <5>

R1C2 can only be <6>

R2C9 can only be <4>

R2C7 can only be <2>

R2C8 can only be <1>

R5C9 can only be <5>

R3C7 can only be <5>

R2C2 can only be <7>

R3C8 can only be <6>

R7C7 can only be <4>

R3C2 can only be <4>

R5C8 can only be <4>

R9C2 can only be <8>

R7C8 can only be <7>

R8C2 can only be <1>

R9C8 can only be <5>



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