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Daily Sudoku Answer 



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Oct 21 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C6 can only be <4>

R2C2 is the only square in row 2 that can be <7>

R3C7 is the only square in row 3 that can be <1>

R3C4 is the only square in row 3 that can be <6>

R8C8 is the only square in row 8 that can be <9>

R5C6 is the only square in column 6 that can be <9>

R4C7 is the only square in row 4 that can be <9>

R6C6 is the only square in column 6 that can be <5>

R6C7 can only be <8>

R7C7 can only be <2>

R7C3 can only be <4>

R5C7 can only be <5>

R2C7 can only be <3>

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

R1C5 is the only square in column 5 that can be <3>

R1C1 is the only square in row 1 that can be <9>

R2C5 is the only square in row 2 that can be <9>

R8C2 is the only square in column 2 that can be <3>

Squares R1C4 and R2C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C4 - removing <8> from <148> leaving <14>

R5C4 - removing <8> from <148> leaving <14>

Squares R4C4 and R5C4 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C5 - removing <1> from <178> leaving <78>

R5C5 - removing <1> from <178> leaving <78>

Squares R4C5 and R5C5 in column 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 column.

R9C5 - removing <8> from <128> leaving <12>

Squares R4C5, R5C5, R4C3 and R5C3 form a Type-2 Unique Rectangle on <78>.

R4C1 - removing <2> from <124> leaving <14>

R3C3 - removing <2> from <235> leaving <35>

R5C2 - removing <2> from <124> leaving <14>

R8C3 - removing <2> from <25> leaving <5>

R8C9 can only be <1>

R3C3 can only be <3>

R8C5 can only be <2>

R7C9 can only be <8>

R6C3 can only be <7>

R6C9 can only be <4>

R6C1 can only be <3>

R7C6 can only be <6>

R9C5 can only be <1>

R9C1 can only be <2>

R7C2 can only be <1>

R9C6 can only be <8>

R9C2 can only be <6>

R3C1 can only be <5>

R3C8 can only be <2>

R2C1 can only be <4>

R5C8 can only be <7>

R1C9 can only be <5>

R5C5 can only be <8>

R9C8 can only be <5>

R4C9 can only be <2>

R5C2 can only be <4>

R9C9 can only be <7>

R1C4 can only be <8>

R2C8 can only be <8>

R4C1 can only be <1>

R1C2 can only be <2>

R2C4 can only be <5>

R1C8 can only be <4>

R4C4 can only be <4>

R5C4 can only be <1>

R4C3 can only be <8>

R5C3 can only be <2>

R4C5 can only be <7>



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