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Daily Sudoku Answer 



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May 19 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s026377



Reasoning 



R8C2 can only be <5>

R8C3 can only be <1>

R1C4 is the only square in row 1 that can be <1>

R1C5 is the only square in row 1 that can be <9>

R3C1 is the only square in row 3 that can be <5>

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

R6C9 is the only square in row 6 that can be <9>

R4C3 is the only square in row 4 that can be <9>

R5C6 is the only square in row 5 that can be <9>

R6C7 is the only square in row 6 that can be <1>

R6C2 is the only square in row 6 that can be <8>

R8C4 is the only square in row 8 that can be <7>

R7C4 is the only square in column 4 that can be <5>

R3C5 is the only square in column 5 that can be <7>

Squares R9C1 and R9C2 in row 9 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.

R9C5 - removing <2> from <268> leaving <68>

R9C6 - removing <2> from <126> leaving <16>

R9C8 - removing <3> from <3568> leaving <568>

R9C9 - removing <3> from <13568> leaving <1568>

Squares R1C9 and R4C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C9 - removing <6> from <368> leaving <38>

R5C9 - removing <67> from <5678> leaving <58>

R9C9 - removing <6> from <1568> leaving <158>

Intersection of row 1 with block 1. The value <4> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R3C2 - removing <4> from <246> leaving <26>

Squares R2C3, R3C3 and R5C3 in column 3, R2C4, R3C4 and R5C4 in column 4 and R2C7 and R5C7 in column 7 form a Swordfish pattern on possibility <2>. All other instances of this possibility in rows 2, 3 and 5 can be removed.

R5C1 - removing <2> from <23467> leaving <3467>

R3C2 - removing <2> from <26> leaving <6>

R5C2 - removing <2> from <2346> leaving <346>

R2C6 - removing <2> from <236> leaving <36>

R3C6 - removing <2> from <2346> leaving <346>

R2C8 - removing <2> from <23678> leaving <3678>

R5C8 - removing <2> from <25678> leaving <5678>

R7C6 is the only square in column 6 that can be <2>

R7C9 is the only square in row 7 that can be <1>

R7C8 is the only square in row 7 that can be <3>

R2C6 is the only square in row 2 that can be <3>

R3C6 can only be <4>

R3C4 can only be <2>

R8C6 can only be <6>

R8C7 can only be <4>

R9C6 can only be <1>

R9C5 can only be <8>

R7C7 can only be <8>

R9C9 can only be <5>

R7C5 can only be <4>

R9C8 can only be <6>

R5C9 can only be <8>

R3C3 can only be <8>

R2C4 can only be <6>

R3C9 can only be <3>

R2C7 can only be <2>

R5C4 can only be <4>

R5C7 can only be <6>

R1C8 can only be <7>

R2C3 can only be <7>

R5C2 can only be <3>

R4C9 can only be <7>

R1C9 can only be <6>

R2C8 can only be <8>

R4C8 can only be <2>

R5C8 can only be <5>

R5C3 can only be <2>

R4C5 can only be <6>

R5C1 can only be <7>

R9C2 can only be <2>

R6C1 can only be <6>

R6C5 can only be <2>

R4C1 can only be <4>

R9C1 can only be <3>

R1C2 can only be <4>

R1C1 can only be <2>



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