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Daily Sudoku Answer 



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Mar 21 - Super Hard
Puzzle Copyright © Kevin Stone

Share Link — www.brainbashers.com/s083945



Reasoning 



R4C4 can only be <9>

R5C7 can only be <9>

R4C8 can only be <6>

R6C4 can only be <2>

R6C6 can only be <6>

R4C6 can only be <1>

R5C3 can only be <1>

R5C8 can only be <2>

R5C2 can only be <8>

R1C1 is the only square in row 1 that can be <3>

R1C5 is the only square in row 1 that can be <2>

R3C9 is the only square in row 3 that can be <6>

R6C3 is the only square in row 6 that can be <9>

R7C5 is the only square in row 7 that can be <6>

R8C7 is the only square in row 8 that can be <3>

R8C3 is the only square in row 8 that can be <6>

R8C9 is the only square in row 8 that can be <8>

R9C4 is the only square in row 9 that can be <3>

R9C6 is the only square in row 9 that can be <8>

Intersection of row 1 with block 3. The value <1> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R2C7 - removing <1> from <1457> leaving <457>

R2C9 - removing <1> from <145> leaving <45>

Squares R2C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C9 - removing <45> from <1459> leaving <19>

Intersection of row 3 with block 2. The values <79> 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 these values.

R1C6 - removing <9> from <459> leaving <45>

R2C5 - removing <7> from <157> leaving <15>

Intersection of row 9 with block 7. The value <4> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R7C1 - removing <4> from <12459> leaving <1259>

Intersection of column 3 with block 1. The value <5> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C1 - removing <5> from <12458> leaving <1248>

R3C1 - removing <5> from <1458> leaving <148>

R3C2 - removing <5> from <145> leaving <14>

Intersection of block 9 with row 7. The value <7> only appears in one or more of squares R7C7, R7C8 and R7C9 of block 9. These squares are the ones that intersect with row 7. Thus, the other (non-intersecting) squares of row 7 cannot contain this value.

R7C4 - removing <7> from <47> leaving <4>

R1C4 can only be <8>

R1C8 can only be <9>

R3C4 can only be <7>

R1C9 can only be <1>

R7C8 can only be <7>

R7C7 can only be <1>

R2C8 can only be <8>

R2C7 is the only square in row 2 that can be <7>

R3C1 is the only square in row 3 that can be <8>

Squares R1C6 and R1C7 in row 1, R4C1 and R4C7 in row 4 and R7C1 and R7C6 in row 7 form a Swordfish pattern on possibility <5>. All other instances of this possibility in columns 1, 6 and 7 can be removed.

R3C6 - removing <5> from <459> leaving <49>

R8C1 - removing <5> from <59> leaving <9>

Squares R2C9 and R4C1 form a remote naked pair. <45> can be removed from any square that is common to their groups.

R2C1 - removing <4> from <124> leaving <12>

Squares R7C1 (XY), R9C3 (XZ) and R4C1 (YZ) form an XY-Wing pattern on <4>. All squares that are buddies of both the XZ and YZ squares cannot be <4>.

R9C1 - removing <4> from <124> leaving <12>

R4C1 is the only square in column 1 that can be <4>

R4C7 can only be <5>

R6C2 can only be <5>

R1C7 can only be <4>

R6C9 can only be <4>

R8C2 can only be <7>

R2C9 can only be <5>

R8C5 can only be <5>

R2C5 can only be <1>

R7C6 can only be <9>

R1C6 can only be <5>

R2C1 can only be <2>

R3C5 can only be <9>

R3C6 can only be <4>

R9C5 can only be <7>

R3C2 can only be <1>

R3C3 can only be <5>

R7C9 can only be <2>

R7C1 can only be <5>

R9C9 can only be <9>

R2C3 can only be <4>

R9C1 can only be <1>

R9C3 can only be <2>

R9C2 can only be <4>



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