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Common Answers

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Sudoku Solution Path

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R4C4 can only be <1>
R5C7 can only be <7>
R5C9 can only be <4>
R4C6 can only be <2>
R4C2 can only be <6>
R6C8 can only be <6>
R4C8 can only be <9>
R2C4 is the only square in row 2 that can be <4>
R2C6 is the only square in row 2 that can be <7>
R6C6 can only be <3>
R6C2 can only be <4>
R6C4 can only be <7>
R8C6 can only be <1>
R5C5 can only be <8>
R8C4 can only be <3>
R7C7 is the only square in row 7 that can be <1>
R3C7 can only be <9>
R1C2 is the only square in row 1 that can be <9>
R8C9 is the only square in row 8 that can be <9>
R9C8 is the only square in row 9 that can be <4>
R8C3 is the only square in row 8 that can be <4>
Squares R3C3 and R5C3 in column 3 form a simple locked 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 column.
   R2C3 - removing <23> from <2356> leaving <56>
   R7C3 - removing <2> from <256> leaving <56>
R7C2 is the only square in row 7 that can be <2>
Squares R2C3 and R2C7 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C1 - removing <56> from <23568> leaving <238>
   R2C8 - removing <5> from <2358> leaving <238>
   R2C9 - removing <6> from <168> leaving <18>
Squares R2C1<238>, R2C2<138>, R3C2<138> and R3C3<23> in block 1 form a comprehensive locked quad. These 4 squares can only contain the 4 possibilities <1238>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R1C1 - removing <3> from <356> leaving <56>
Squares R1C1 and R8C7 form a remote locked pair. <56> can be removed from any square that is common to their groups.
   R8C1 - removing <56> from <568> leaving <8>
R8C2 can only be <7>
R8C8 can only be <5>
R9C2 can only be <3>
R8C7 can only be <6>
R1C8 can only be <3>
R7C8 can only be <7>
R9C1 can only be <6>
R1C5 can only be <1>
R7C5 can only be <6>
R2C7 can only be <5>
R9C9 can only be <8>
R9C5 can only be <7>
R1C1 can only be <5>
R7C3 can only be <5>
R2C9 can only be <1>
R2C3 can only be <6>
R1C9 can only be <6>
R3C5 can only be <3>
R2C2 can only be <8>
R3C3 can only be <2>
R2C8 can only be <2>
R3C2 can only be <1>
R2C1 can only be <3>
R3C8 can only be <8>
R5C3 can only be <3>
R5C1 can only be <2>


 

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