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Daily Sudoku Answer 



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Apr 06 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C7 can only be <3>

R7C5 can only be <4>

R3C5 can only be <5>

R9C6 can only be <1>

R2C5 can only be <6>

R1C4 can only be <4>

R1C6 can only be <2>

R2C1 is the only square in row 2 that can be <9>

R3C9 is the only square in row 3 that can be <2>

R5C7 is the only square in row 5 that can be <1>

R3C7 can only be <8>

R3C3 can only be <4>

R3C1 can only be <1>

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

R7C1 is the only square in row 7 that can be <2>

R8C2 is the only square in row 8 that can be <1>

R9C2 is the only square in column 2 that can be <4>

R8C8 is the only square in row 8 that can be <4>

R6C4 is the only square in column 4 that can be <5>

Squares R5C5 and R5C8 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C3 - removing <8> from <578> leaving <57>

R1C3 is the only square in column 3 that can be <8>

Intersection of column 2 with block 1. The value <3> 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 this value.

R1C1 - removing <3> from <357> leaving <57>

Intersection of block 6 with column 9. The value <6> only appears in one or more of squares R4C9, R5C9 and R6C9 of block 6. These squares are the ones that intersect with column 9. Thus, the other (non-intersecting) squares of column 9 cannot contain this value.

R9C9 - removing <6> from <56789> leaving <5789>

Squares R5C8 and R9C4 form a remote naked pair. <38> can be removed from any square that is common to their groups.

R9C8 - removing <8> from <568> leaving <56>

R5C8 is the only square in column 8 that can be <8>

R5C5 can only be <3>

R6C9 can only be <6>

R6C6 can only be <4>

R4C9 can only be <3>

R4C4 can only be <8>

R8C5 can only be <8>

R6C1 can only be <8>

R4C6 can only be <6>

R8C9 can only be <7>

R9C4 can only be <3>

R8C1 can only be <3>

R2C9 can only be <5>

R9C7 can only be <6>

R9C8 can only be <5>

R1C7 can only be <7>

R9C1 can only be <7>

R2C8 can only be <3>

R7C9 can only be <9>

R1C1 can only be <5>

R1C8 can only be <6>

R2C2 can only be <7>

R4C1 can only be <4>

R7C3 can only be <5>

R9C9 can only be <8>

R9C3 can only be <9>

R1C2 can only be <3>

R5C2 can only be <5>

R5C3 can only be <7>



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