Copyright © Kevin Stone

R3C5 can only be <5>

R3C6 can only be <8>

R4C4 can only be <9>

R4C7 can only be <5>

R5C5 can only be <7>

R6C4 can only be <8>

R7C5 can only be <6>

R3C4 can only be <3>

R6C6 can only be <2>

R4C6 can only be <6>

R7C4 can only be <4>

R7C6 can only be <9>

R4C3 can only be <7>

R6C7 can only be <3>

R5C3 can only be <3>

R6C3 can only be <5>

R5C7 can only be <4>

R1C3 can only be <9>

R1C7 can only be <8>

R3C3 is the only square in row 3 that can be <4>

R7C3 is the only square in row 7 that can be <8>

R9C3 is the only square in column 3 that can be <2>

Squares R2C3 and R2C7 in row 2 form a simple locked 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.

R2C1 - removing <1> from <135> leaving <35>

Squares R2C7 and R3C8 in block 3 form a simple locked 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 block.

R3C7 - removing <16> from <1269> leaving <29>

Squares R2C1 and R2C9 in row 2 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.

R7C1 - removing <3> from <1357> leaving <157>

R7C9 - removing <3> from <235> leaving <25>

Squares R1C2 and R1C8 in row 1 and R9C2 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 2 and 8 can be removed.

R7C2 - removing <5> from <357> leaving <37>

R7C8 - removing <5> from <135> leaving <13>

Squares R2C3 and R2C7 in row 2 and R8C3 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 3 and 7 can be removed.

R9C7 - removing <6> from <67> leaving <7>

Squares R8C1 (XY), R3C1 (XZ) and R7C2 (YZ) form an XY-Wing pattern on <7>. All squares that are buddies of both the XZ and YZ squares cannot be <7>.

R7C1 - removing <7> from <157> leaving <15>

R3C2 - removing <7> from <67> leaving <6>

R3C8 can only be <1>

R9C2 can only be <5>

R2C3 can only be <1>

R3C1 can only be <7>

R7C8 can only be <3>

R2C7 can only be <6>

R7C2 can only be <7>

R1C8 can only be <5>

R8C9 can only be <9>

R3C9 can only be <2>

R9C8 can only be <6>

R1C2 can only be <3>

R7C1 can only be <1>

R8C7 can only be <1>

R2C1 can only be <5>

R2C9 can only be <3>

R8C3 can only be <6>

R3C7 can only be <9>

R7C9 can only be <5>

R7C7 can only be <2>

R8C1 can only be <3>