Dec 22 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C2 is the only square in row 1 that can be <1>
R2C5 is the only square in row 2 that can be <8>
R2C6 is the only square in row 2 that can be <6>
R2C1 is the only square in row 2 that can be <9>
R3C9 is the only square in row 3 that can be <6>
R3C8 is the only square in row 3 that can be <5>
R6C4 is the only square in row 6 that can be <8>
R4C3 is the only square in row 4 that can be <8>
R3C3 is the only square in column 3 that can be <7>
Squares R7C9 and R8C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C9 - removing <37> from <3457> leaving <45>
R6C9 - removing <3> from <345> leaving <45>
R5C7 is the only square in block 6 that can be <7>
R2C8 is the only square in row 2 that can be <7>
Squares R5C9 and R6C9 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R6C7 - removing <4> from <134> leaving <13>
R6C9 is the only square in row 6 that can be <4>
R5C9 can only be <5>
Squares R6C7 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C5 - removing <13> from <1359> leaving <59>
R6C6 - removing <13> from <1359> leaving <59>
Squares R6C5 and R6C6 in block 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 block.
R4C5 - removing <5> from <1357> leaving <137>
R4C6 - removing <5> from <1357> leaving <137>
R6C6 is the only square in column 6 that can be <5>
R6C5 can only be <9>
R3C5 can only be <3>
R3C1 can only be <4>
R3C7 can only be <2>
R2C2 can only be <3>
R3C6 can only be <9>
R1C8 can only be <3>
R6C8 can only be <1>
R2C7 can only be <4>
R9C2 can only be <6>
R6C7 can only be <3>
R9C8 can only be <9>
R9C4 can only be <3>
R8C8 can only be <2>
R7C7 can only be <1>
R8C2 can only be <5>
R9C6 can only be <1>
R8C5 can only be <7>
R4C2 can only be <4>
R7C2 can only be <2>
R7C1 can only be <3>
R8C4 can only be <9>
R8C9 can only be <3>
R4C5 can only be <1>
R7C9 can only be <7>
R4C4 can only be <7>
R4C6 can only be <3>
R1C4 can only be <2>
R5C5 can only be <6>
R4C1 can only be <5>
R5C6 can only be <2>
R7C5 can only be <5>
R5C4 can only be <4>
R1C6 can only be <7>
R7C3 can only be <9>
R5C1 can only be <1>
R7C4 can only be <6>
R8C3 can only be <1>
R5C3 can only be <3>
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