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Daily Sudoku Answer 



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Jan 02 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s050224



Reasoning 



R5C8 can only be <8>

R6C4 can only be <9>

R4C7 can only be <3>

R6C6 can only be <5>

R4C3 can only be <4>

R6C7 can only be <2>

R6C3 can only be <3>

R2C5 is the only square in row 2 that can be <5>

R2C9 is the only square in row 2 that can be <7>

R5C4 is the only square in row 5 that can be <1>

R5C6 is the only square in row 5 that can be <4>

R7C9 is the only square in row 7 that can be <5>

R5C9 can only be <9>

R5C7 can only be <5>

Intersection of row 2 with block 1. The value <2> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C1 - removing <2> from <12369> leaving <1369>

R1C3 - removing <2> from <1289> leaving <189>

R3C1 - removing <2> from <12369> leaving <1369>

R3C2 - removing <2> from <236> leaving <36>

Intersection of row 7 with block 8. The value <8> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R9C4 - removing <8> from <4678> leaving <467>

R9C6 - removing <8> from <3678> leaving <367>

Intersection of row 8 with block 7. The value <7> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R9C1 - removing <7> from <13479> leaving <1349>

R9C3 - removing <7> from <179> leaving <19>

Squares R3C1 and R3C8 in row 3 and R7C1 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 1 and 8 can be removed.

R1C1 - removing <1> from <1369> leaving <369>

R8C1 - removing <1> from <13479> leaving <3479>

R9C1 - removing <1> from <1349> leaving <349>

Squares R1C1 and R1C9 in row 1 and R8C1 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 1 and 9 can be removed.

R3C1 - removing <3> from <1369> leaving <169>

R3C9 - removing <3> from <23> leaving <2>

R7C1 - removing <3> from <1234> leaving <124>

R9C1 - removing <3> from <349> leaving <49>

R9C9 - removing <3> from <348> leaving <48>

R1C4 is the only square in row 1 that can be <2>

R1C5 is the only square in row 1 that can be <4>

R8C5 can only be <1>

R8C7 can only be <9>

R9C5 can only be <6>

R8C3 can only be <7>

R5C3 can only be <2>

R5C2 can only be <6>

R2C3 can only be <8>

R2C7 can only be <6>

R2C1 can only be <2>

R5C1 can only be <7>

R3C2 can only be <3>

R3C8 can only be <1>

R7C2 can only be <2>

R7C8 can only be <3>

R1C7 can only be <8>

R7C6 can only be <8>

R8C9 can only be <4>

R8C1 can only be <3>

R9C9 can only be <8>

R9C7 can only be <1>

R1C9 can only be <3>

R7C4 can only be <4>

R4C6 can only be <6>

R9C3 can only be <9>

R4C4 can only be <8>

R1C6 can only be <9>

R7C1 can only be <1>

R9C4 can only be <7>

R9C1 can only be <4>

R1C3 can only be <1>

R9C6 can only be <3>

R3C4 can only be <6>

R1C1 can only be <6>

R3C6 can only be <7>

R3C1 can only be <9>



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