Jan 07 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R8C8 can only be <7>
R7C8 can only be <9>
R5C8 can only be <4>
R4C7 can only be <9>
R6C7 can only be <1>
R5C9 can only be <8>
R5C2 can only be <6>
R5C1 can only be <9>
R3C3 is the only square in row 3 that can be <9>
R5C5 is the only square in row 5 that can be <1>
R9C9 is the only square in row 9 that can be <1>
R9C7 is the only square in row 9 that can be <6>
R3C7 is the only square in column 7 that can be <4>
Squares R3C1 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C2 - removing <5> from <257> leaving <27>
R3C5 - removing <6> from <36> leaving <3>
R6C5 is the only square in column 5 that can be <6>
Squares R4C3 and R4C5 in row 4 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.
R4C4 - removing <4> from <457> leaving <57>
R4C6 - removing <48> from <4578> leaving <57>
Squares R7C7 and R7C9 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R7C2 - removing <2> from <2578> leaving <578>
R7C3 - removing <23> from <23478> leaving <478>
R9C3 is the only square in column 3 that can be <3>
R1C3 is the only square in column 3 that can be <2>
R1C7 can only be <3>
R3C2 can only be <7>
R1C9 can only be <7>
R7C7 can only be <2>
R1C6 can only be <9>
R3C9 can only be <2>
R2C2 can only be <5>
R7C9 can only be <3>
R1C4 can only be <6>
R2C8 can only be <6>
R7C2 can only be <8>
R3C1 can only be <6>
R3C8 can only be <5>
R1C1 can only be <8>
R7C5 can only be <4>
R8C2 can only be <2>
R7C1 can only be <5>
R7C3 can only be <7>
R4C5 can only be <8>
R8C4 can only be <3>
R8C6 can only be <8>
R5C4 can only be <2>
R6C6 can only be <4>
R4C3 can only be <4>
R5C6 can only be <3>
R9C4 can only be <5>
R6C3 can only be <8>
R6C4 can only be <9>
R2C6 can only be <7>
R9C1 can only be <4>
R9C6 can only be <2>
R4C4 can only be <7>
R2C4 can only be <4>
R4C6 can only be <5>
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