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Daily Sudoku Answer 



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Feb 14 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s312748



Reasoning 



R2C5 can only be <4>

R3C2 can only be <5>

R2C1 can only be <7>

R1C5 can only be <9>

R1C6 can only be <5>

R3C5 can only be <6>

R1C4 can only be <2>

R2C9 can only be <2>

R1C2 can only be <3>

R1C1 can only be <4>

R1C8 can only be <1>

R3C3 can only be <9>

R1C9 can only be <7>

R7C2 is the only square in row 7 that can be <7>

R7C8 is the only square in row 7 that can be <2>

R9C7 is the only square in row 9 that can be <7>

R9C2 is the only square in column 2 that can be <2>

R4C8 is the only square in column 8 that can be <3>

R4C3 can only be <7>

R4C6 is the only square in row 4 that can be <9>

R5C9 is the only square in row 5 that can be <9>

R6C4 is the only square in row 6 that can be <7>

R6C6 is the only square in row 6 that can be <4>

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

R7C1 is the only square in row 7 that can be <9>

R9C8 is the only square in row 9 that can be <9>

R9C3 is the only square in row 9 that can be <4>

R8C3 is the only square in column 3 that can be <1>

R8C1 is the only square in row 8 that can be <3>

R9C6 is the only square in row 9 that can be <3>

R9C9 is the only square in row 9 that can be <1>

Squares R6C1 and R6C9 in row 6 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 row.

R6C5 - removing <8> from <138> leaving <13>

R6C7 - removing <58> from <1258> leaving <12>

Squares R4C7 and R6C9 in block 6 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 block.

R5C7 - removing <58> from <1258> leaving <12>

Squares R4C2 and R8C2 in column 2, R3C7, R4C7 and R8C7 in column 7 and R3C8 and R8C8 in column 8 form a Swordfish pattern on possibility <8>. All other instances of this possibility in rows 3, 4 and 8 can be removed.

R4C4 - removing <8> from <568> leaving <56>

R8C9 - removing <8> from <568> leaving <56>

Intersection of block 5 with row 5. The value <8> only appears in one or more of squares R5C4, R5C5 and R5C6 of block 5. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.

R5C1 - removing <8> from <568> leaving <56>

Squares R4C2 and R9C4 form a remote naked pair. <68> can be removed from any square that is common to their groups.

R4C4 - removing <6> from <56> leaving <5>

R4C7 can only be <8>

R4C2 can only be <6>

R3C7 can only be <4>

R6C9 can only be <5>

R6C1 can only be <8>

R8C9 can only be <6>

R8C2 can only be <8>

R7C9 can only be <8>

R3C8 can only be <8>

R8C7 can only be <5>

R8C8 can only be <4>

R5C1 can only be <5>

R9C1 can only be <6>

R7C5 can only be <1>

R9C4 can only be <8>

R5C4 can only be <6>

R5C6 can only be <1>

R5C7 can only be <2>

R7C6 can only be <6>

R6C5 can only be <3>

R5C3 can only be <3>

R6C7 can only be <1>

R6C3 can only be <2>

R5C5 can only be <8>



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