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Daily Sudoku Answer 



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Feb 16 - Super Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C3 can only be <4>

R9C6 can only be <9>

R7C6 is the only square in row 7 that can be <8>

R7C4 is the only square in row 7 that can be <4>

R7C3 is the only square in row 7 that can be <9>

R3C2 is the only square in column 2 that can be <8>

Squares R4C4 and R4C9 in row 4 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 row.

R4C1 - removing <3> from <356> leaving <56>

R4C3 - removing <37> from <135678> leaving <1568>

R4C6 - removing <3> from <135> leaving <15>

R4C7 - removing <37> from <3678> leaving <68>

Squares R1C3 and R8C3 in column 3 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 column.

R3C3 - removing <23> from <235> leaving <5>

R5C3 - removing <3> from <137> leaving <17>

R6C3 - removing <3> from <35678> leaving <5678>

R9C3 - removing <2> from <126> leaving <16>

Squares R4C9<37>, R5C7<2379>, R5C8<279> and R6C9<237> in block 6 form a comprehensive naked quad. These 4 squares can only contain the 4 possibilities <2379>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R6C7 - removing <237> from <23678> leaving <68>

Squares R4C7, R6C7, R4C3 and R6C3 form a Type-3 Unique Rectangle on <68>. Upon close inspection, it is clear that:

(R4C3 or R6C3)<17> and R5C3<17> form a naked pair on <17> in block 4. No other squares in the block can contain these possibilities

R5C2 - removing <1> from <13> leaving <3>

(R4C3 or R6C3)<17>, R5C3<17> and R5C2<13> form a naked triplet on <137> in block 4. No other squares in the block can contain these possibilities

R6C1 - removing <3> from <356> leaving <56>

(R4C3 or R6C3)<17> and R5C3<17> form a naked pair on <17> in column 3. No other squares in the column can contain these possibilities

R9C3 - removing <1> from <16> leaving <6>

R7C2 can only be <1>

R9C4 can only be <2>

R9C7 can only be <1>

R8C5 can only be <5>

R2C7 can only be <7>

R2C5 can only be <1>

R7C5 can only be <6>

R3C5 can only be <7>

R5C5 can only be <2>

R5C7 can only be <9>

R5C8 can only be <7>

R5C3 can only be <1>

R7C8 can only be <2>

R4C9 can only be <3>

R7C1 can only be <3>

R3C8 can only be <9>

R8C7 can only be <3>

R8C3 can only be <2>

R7C7 can only be <5>

R7C9 can only be <7>

R4C4 can only be <7>

R6C9 can only be <2>

R4C3 can only be <8>

R3C9 can only be <1>

R3C1 can only be <2>

R1C3 can only be <3>

R1C4 can only be <9>

R1C6 can only be <4>

R1C7 can only be <2>

R3C6 can only be <3>

R3C7 can only be <4>

R3C4 can only be <6>

R6C6 can only be <5>

R4C7 can only be <6>

R6C3 can only be <7>

R6C4 can only be <3>

R4C1 can only be <5>

R6C7 can only be <8>

R6C1 can only be <6>

R4C6 can only be <1>



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