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Daily Sudoku Answer 



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Mar 21 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C1 can only be <2>

R5C9 can only be <1>

R2C2 is the only square in row 2 that can be <9>

R7C2 is the only square in column 2 that can be <1>

R2C4 is the only square in column 4 that can be <7>

R4C8 is the only square in column 8 that can be <9>

R2C9 is the only square in block 3 that can be <6>

Squares R6C7 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C2 - removing <8> from <68> leaving <6>

R6C4 - removing <48> from <2458> leaving <25>

R6C5 - removing <48> from <24568> leaving <256>

R1C3 is the only square in row 1 that can be <6>

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

Squares R4C2 and R4C3 in row 4 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.

R4C5 - removing <8> from <468> leaving <46>

Squares R2C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C7 - removing <8> from <18> leaving <1>

R7C7 - removing <4> from <3457> leaving <357>

R8C7 - removing <4> from <1457> leaving <157>

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

R2C3 - removing <2> from <258> leaving <58>

Intersection of row 2 with block 2. The value <2> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C4 - removing <2> from <238> leaving <38>

R1C6 - removing <2> from <23> leaving <3>

R3C5 - removing <2> from <12458> leaving <1458>

R3C6 - removing <2> from <1245> leaving <145>

R1C4 can only be <8>

R5C6 can only be <9>

R1C2 can only be <2>

R5C4 can only be <3>

R5C5 can only be <8>

R8C4 is the only square in row 8 that can be <9>

R9C7 is the only square in row 9 that can be <3>

R7C5 is the only square in row 7 that can be <3>

R7C4 is the only square in column 4 that can be <4>

R7C9 can only be <2>

R7C8 can only be <6>

R3C9 can only be <4>

R2C7 can only be <8>

R9C8 can only be <1>

R8C8 can only be <4>

R2C3 can only be <5>

R6C7 can only be <4>

R3C8 can only be <2>

R6C8 can only be <8>

R9C3 can only be <2>

R3C1 can only be <7>

R3C2 can only be <8>

R7C1 can only be <5>

R4C2 can only be <7>

R4C3 can only be <8>

R7C7 can only be <7>

R8C1 can only be <6>

R8C7 can only be <5>

R9C4 can only be <5>

R8C3 can only be <7>

R9C6 can only be <6>

R6C4 can only be <2>

R4C6 can only be <4>

R4C5 can only be <6>

R2C6 can only be <2>

R6C5 can only be <5>

R3C5 can only be <1>

R2C5 can only be <4>

R8C6 can only be <1>

R3C6 can only be <5>

R8C5 can only be <2>



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