Jul 06 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C8 can only be <7>
R6C3 can only be <9>
R4C5 is the only square in row 4 that can be <4>
R5C1 is the only square in column 1 that can be <1>
R5C8 can only be <4>
R8C9 is the only square in row 8 that can be <4>
R5C6 is the only square in column 6 that can be <9>
R1C8 is the only square in column 8 that can be <3>
R5C2 is the only square in block 4 that can be <3>
Squares R7C4, R7C5 and R7C6 in row 7 form a simple naked triplet. These 3 squares all contain the 3 possibilities <238>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R7C1 - removing <38> from <3578> leaving <57>
R7C9 - removing <2> from <257> leaving <57>
R9C1 is the only square in column 1 that can be <3>
Squares R4C3 and R5C3 in column 3 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.
R1C3 - removing <58> from <2578> leaving <27>
R9C3 - removing <58> from <2578> leaving <27>
Squares R7C4, R7C5 and R7C6 in block 8 form a simple naked triplet. These 3 squares all contain the 3 possibilities <238>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R8C5 - removing <28> from <1289> leaving <19>
R9C5 - removing <28> from <1289> leaving <19>
R8C2 is the only square in row 8 that can be <2>
R9C3 can only be <7>
R1C3 can only be <2>
R7C1 can only be <5>
R7C9 can only be <7>
R2C5 is the only square in row 2 that can be <2>
R1C5 is the only square in block 2 that can be <8>
R7C5 can only be <3>
R1C1 is the only square in row 1 that can be <7>
Squares R8C5 and R9C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R6C5 - removing <1> from <16> leaving <6>
R5C7 is the only square in column 7 that can be <6>
R5C9 can only be <2>
R6C7 can only be <1>
R1C7 can only be <5>
R4C7 can only be <7>
R1C2 can only be <9>
R9C7 can only be <2>
R2C9 can only be <6>
R2C1 can only be <8>
R3C9 can only be <9>
R3C1 can only be <6>
R1C9 can only be <1>
R4C6 can only be <8>
R9C2 can only be <8>
R9C9 can only be <5>
R2C2 can only be <5>
R8C1 can only be <9>
R4C3 can only be <5>
R7C6 can only be <2>
R5C4 can only be <5>
R5C3 can only be <8>
R5C5 can only be <7>
R3C4 can only be <3>
R4C4 can only be <1>
R3C5 can only be <5>
R7C4 can only be <8>
R6C6 can only be <3>
R8C5 can only be <1>
R8C8 can only be <8>
R9C5 can only be <9>
R9C8 can only be <1>
R3C6 can only be <7>
R6C4 can only be <2>
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