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Daily Sudoku Answer 



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Oct 03 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s095090



Reasoning 



R1C9 can only be <8>

R3C4 can only be <1>

R7C4 can only be <8>

R8C4 can only be <6>

R6C5 is the only square in row 6 that can be <6>

Squares R6C3 and R6C7 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C2 - removing <38> from <3489> leaving <49>

R6C8 - removing <38> from <3489> leaving <49>

Intersection of block 5 with row 5. The values <19> 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 these values.

R5C1 - removing <9> from <34789> leaving <3478>

R5C2 - removing <9> from <234789> leaving <23478>

R5C8 - removing <9> from <23489> leaving <2348>

R5C9 - removing <9> from <249> leaving <24>

Intersection of column 1 with block 7. The value <9> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C2 - removing <9> from <123489> leaving <12348>

R9C2 - removing <9> from <289> leaving <28>

Intersection of column 9 with block 9. The value <9> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C8 - removing <9> from <45789> leaving <4578>

R9C8 - removing <9> from <5689> leaving <568>

Squares R6C2 and R6C8 in row 6 and R7C2 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 2 and 8 can be removed.

R4C2 - removing <4> from <2349> leaving <239>

R4C8 - removing <4> from <23459> leaving <2359>

R5C2 - removing <4> from <23478> leaving <2378>

R5C8 - removing <4> from <2348> leaving <238>

R8C2 - removing <4> from <12348> leaving <1238>

R8C8 - removing <4> from <4578> leaving <578>

R4C5 is the only square in row 4 that can be <4>

R5C4 can only be <9>

R2C4 can only be <4>

R2C6 is the only square in row 2 that can be <9>

R8C6 is the only square in column 6 that can be <5>

R9C5 can only be <2>

R9C2 can only be <8>

R9C1 can only be <9>

R9C9 can only be <6>

R9C8 can only be <5>

R2C9 can only be <2>

R5C9 can only be <4>

R8C9 can only be <9>

R6C8 can only be <9>

R6C2 can only be <4>

R7C2 can only be <1>

R7C6 can only be <7>

R7C8 can only be <4>

R3C6 can only be <3>

R8C5 can only be <1>

R5C5 can only be <3>

R5C6 can only be <1>

R1C8 is the only square in row 1 that can be <1>

R2C3 is the only square in row 2 that can be <1>

R2C1 is the only square in row 2 that can be <8>

R5C1 can only be <7>

R5C2 can only be <2>

R1C1 can only be <3>

R5C8 can only be <8>

R8C2 can only be <3>

R4C3 can only be <3>

R8C8 can only be <7>

R6C7 can only be <3>

R6C3 can only be <8>

R2C7 can only be <7>

R4C7 can only be <5>

R4C8 can only be <2>

R8C1 can only be <4>

R8C3 can only be <2>

R4C2 can only be <9>

R8C7 can only be <8>

R3C8 can only be <6>

R2C5 can only be <5>

R3C2 can only be <7>

R2C8 can only be <3>

R2C2 can only be <6>

R1C5 can only be <7>

R1C2 can only be <5>



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