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Daily Sudoku Answer 



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Apr 05 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s019112



Reasoning 



R1C8 is the only square in row 1 that can be <8>

R1C2 is the only square in row 1 that can be <3>

R5C5 is the only square in row 5 that can be <1>

R2C2 is the only square in column 2 that can be <4>

R2C8 can only be <5>

R5C8 can only be <3>

R3C8 can only be <4>

R8C8 can only be <6>

R9C8 can only be <7>

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

R4C5 is the only square in row 4 that can be <5>

R9C7 is the only square in row 9 that can be <5>

R8C3 is the only square in row 8 that can be <5>

R1C1 is the only square in row 1 that can be <5>

R7C2 is the only square in column 2 that can be <7>

R9C4 is the only square in column 4 that can be <8>

R9C9 can only be <1>

R8C9 can only be <3>

R8C7 can only be <2>

R3C9 can only be <9>

R2C7 can only be <1>

R8C2 can only be <9>

R3C7 can only be <3>

R8C4 can only be <1>

R5C2 can only be <6>

R5C1 can only be <9>

R9C2 can only be <2>

R1C6 is the only square in column 6 that can be <1>

R1C4 is the only square in row 1 that can be <4>

Squares R7C1 and R7C3 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C5 - removing <6> from <236> leaving <23>

R7C6 - removing <6> from <236> leaving <23>

Intersection of column 4 with block 5. The value <9> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R4C6 - removing <9> from <469> leaving <46>

R6C5 - removing <9> from <379> leaving <37>

R6C6 - removing <9> from <349> leaving <34>

Squares R7C1, R7C3, R3C1 and R3C3 form a Type-4 Unique Rectangle on <16>.

R3C1 - removing <6> from <1267> leaving <127>

R3C3 - removing <6> from <1267> leaving <127>

Intersection of row 3 with block 2. The value <6> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C6 - removing <6> from <269> leaving <29>

Squares R7C7, R7C9, R4C7 and R4C9 form a Type-1 Unique Rectangle on <48>.

R4C7 - removing <48> from <489> leaving <9>

R6C4 is the only square in row 6 that can be <9>

Squares R1C5 (XY), R3C4 (XZ) and R9C5 (YZ) form an XY-Wing pattern on <6>. All squares that are buddies of both the XZ and YZ squares cannot be <6>.

R3C5 - removing <6> from <267> leaving <27>

R3C4 is the only square in row 3 that can be <6>

R4C4 can only be <7>

R4C3 can only be <8>

R6C5 can only be <3>

R6C6 can only be <4>

R7C5 can only be <2>

R6C7 can only be <8>

R4C6 can only be <6>

R7C7 can only be <4>

R4C9 can only be <4>

R7C6 can only be <3>

R3C5 can only be <7>

R7C9 can only be <8>

R1C5 can only be <9>

R9C6 can only be <9>

R9C5 can only be <6>

R2C6 can only be <2>

R1C3 can only be <7>

R2C1 can only be <6>

R6C3 can only be <2>

R2C3 can only be <9>

R7C1 can only be <1>

R6C1 can only be <7>

R3C3 can only be <1>

R7C3 can only be <6>

R3C1 can only be <2>



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