Copyright © Kevin Stone

R1C5 can only be <7>

R4C3 can only be <1>

R6C3 can only be <4>

R5C1 can only be <3>

R5C4 can only be <4>

R5C9 can only be <8>

R7C4 can only be <3>

R5C5 can only be <9>

R5C6 can only be <1>

R3C4 can only be <6>

R9C5 can only be <8>

R4C5 can only be <3>

R7C6 can only be <4>

R3C6 can only be <3>

R4C4 can only be <7>

R6C4 can only be <2>

R6C6 can only be <6>

R4C7 can only be <6>

R6C5 can only be <5>

R4C6 can only be <8>

R6C7 can only be <3>

R1C8 is the only square in row 1 that can be <9>

R3C2 is the only square in row 3 that can be <5>

R7C3 is the only square in row 7 that can be <9>

R9C8 is the only square in row 9 that can be <2>

R3C7 is the only square in row 3 that can be <2>

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

R8C7 is the only square in column 7 that can be <4>

Squares R3C8 and R7C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C8 - removing <78> from <3678> leaving <36>

R8C8 - removing <78> from <3678> leaving <36>

Squares R8C8 and R9C9 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C9 - removing <36> from <1367> leaving <17>

Intersection of column 2 with block 7. The values <37> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R8C3 - removing <7> from <678> leaving <68>

Squares R1C1 and R1C9 in row 1 and R9C1 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 1 and 9 can be removed.

R2C1 - removing <6> from <168> leaving <18>

R2C9 - removing <6> from <1367> leaving <137>

R8C1 - removing <6> from <168> leaving <18>

Squares R2C1 and R2C7 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C3 - removing <8> from <678> leaving <67>

R2C9 - removing <1> from <137> leaving <37>

Squares R2C1 and R8C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <1> from <146> leaving <46>

Squares R7C7 and R8C1 form a remote locked pair. <18> can be removed from any square that is common to their groups.

R8C9 - removing <1> from <17> leaving <7>

R7C2 - removing <1> from <17> leaving <7>

R7C8 can only be <8>

R7C7 can only be <1>

R3C8 can only be <7>

R2C9 can only be <3>

R2C8 can only be <6>

R9C9 can only be <6>

R3C3 can only be <8>

R2C7 can only be <8>

R9C1 can only be <4>

R1C9 can only be <1>

R8C8 can only be <3>

R1C2 can only be <4>

R2C1 can only be <1>

R2C3 can only be <7>

R8C3 can only be <6>

R8C2 can only be <1>

R9C2 can only be <3>

R1C1 can only be <6>

R8C1 can only be <8>