Nov 17 - Very Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C2 can only be <5>
R6C3 can only be <9>
R5C8 can only be <2>
R5C9 can only be <4>
R1C1 is the only square in row 1 that can be <9>
R2C9 is the only square in row 2 that can be <8>
R5C4 is the only square in row 5 that can be <9>
R6C4 is the only square in row 6 that can be <1>
R8C5 is the only square in row 8 that can be <8>
R5C6 is the only square in row 5 that can be <8>
Squares R7C6 and R7C9 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R7C1 - removing <3> from <23> leaving <2>
R7C3 - removing <3> from <2348> leaving <248>
R7C4 - removing <35> from <356> leaving <6>
R7C7 - removing <35> from <34568> leaving <468>
R2C1 can only be <5>
R2C5 can only be <2>
R4C6 is the only square in row 4 that can be <2>
Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C7 - removing <57> from <3567> leaving <36>
R3C7 - removing <57> from <3567> leaving <36>
R9C7 - removing <5> from <34568> leaving <3468>
Squares R1C7 and R3C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R9C7 - removing <36> from <3468> leaving <48>
R9C8 is the only square in row 9 that can be <6>
R1C8 can only be <5>
Squares R1C7 and R3C7 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R1C9 - removing <3> from <237> leaving <27>
R3C9 - removing <3> from <237> leaving <27>
Squares R7C3, R7C7, R9C3 and R9C7 form a Type-1 Unique Rectangle on <48>.
R9C3 - removing <48> from <348> leaving <3>
R9C5 can only be <5>
R4C3 can only be <6>
R8C1 can only be <1>
R9C9 can only be <1>
R7C6 can only be <3>
R9C1 can only be <7>
R8C9 can only be <3>
R5C1 can only be <3>
R5C5 can only be <6>
R7C9 can only be <5>
R9C2 can only be <4>
R3C1 can only be <6>
R9C7 can only be <8>
R1C2 can only be <7>
R7C3 can only be <8>
R7C7 can only be <4>
R1C9 can only be <2>
R1C3 can only be <4>
R3C9 can only be <7>
R3C7 can only be <3>
R3C4 can only be <5>
R1C7 can only be <6>
R1C5 can only be <3>
R3C3 can only be <2>
R4C5 can only be <7>
R3C6 can only be <4>
R4C4 can only be <3>
R6C6 can only be <5>
R4C7 can only be <5>
R6C5 can only be <4>
R6C7 can only be <7>
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