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Daily Sudoku Answer 



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Apr 21 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C7 can only be <8>

R8C7 can only be <2>

R8C8 can only be <7>

R9C7 can only be <3>

R7C9 can only be <9>

R6C7 can only be <1>

R4C7 can only be <4>

R7C4 can only be <6>

R9C9 can only be <5>

R1C7 can only be <6>

R7C1 can only be <7>

R7C6 can only be <4>

R5C1 is the only square in row 5 that can be <4>

R1C3 is the only square in row 1 that can be <4>

R2C8 is the only square in row 2 that can be <4>

R5C5 is the only square in row 5 that can be <6>

R2C6 is the only square in row 2 that can be <6>

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

R4C9 is the only square in row 4 that can be <7>

R5C9 is the only square in row 5 that can be <2>

R8C1 is the only square in row 8 that can be <6>

R6C2 is the only square in column 2 that can be <7>

R6C6 is the only square in row 6 that can be <3>

R4C8 is the only square in row 4 that can be <3>

R5C8 can only be <8>

R5C2 can only be <3>

R6C5 is the only square in row 6 that can be <2>

R2C4 is the only square in row 2 that can be <2>

R9C6 is the only square in row 9 that can be <2>

R9C5 is the only square in row 9 that can be <7>

R1C6 is the only square in row 1 that can be <7>

R3C3 is the only square in row 3 that can be <7>

Squares R2C2 and R2C9 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C3 - removing <8> from <589> leaving <59>

R2C5 - removing <18> from <1589> leaving <59>

Squares R8C2 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C4 - removing <18> from <1589> leaving <59>

R8C5 - removing <18> from <1589> leaving <59>

Squares R2C5 and R8C5 in column 5 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.

R1C5 - removing <9> from <189> leaving <18>

Squares R1C5 and R3C6 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C4 - removing <18> from <1389> leaving <39>

R3C4 - removing <18> from <1358> leaving <35>

Squares R8C4 and R8C5 in block 8 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.

R9C4 - removing <9> from <189> leaving <18>

Squares R2C2 and R3C6 form a remote naked pair. <18> can be removed from any square that is common to their groups.

R3C1 - removing <18> from <158> leaving <5>

R3C4 can only be <3>

R6C1 can only be <8>

R2C3 can only be <9>

R1C4 can only be <9>

R6C3 can only be <5>

R1C1 can only be <1>

R8C4 can only be <5>

R2C5 can only be <5>

R9C3 can only be <8>

R8C5 can only be <9>

R9C4 can only be <1>

R8C2 can only be <1>

R9C1 can only be <9>

R4C4 can only be <8>

R8C6 can only be <8>

R1C5 can only be <8>

R2C2 can only be <8>

R1C9 can only be <3>

R4C5 can only be <1>

R3C6 can only be <1>

R2C9 can only be <1>

R3C9 can only be <8>



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