Copyright © Kevin Stone

R3C6 can only be <2>

R4C4 can only be <5>

R4C6 can only be <9>

R5C5 can only be <4>

R5C9 can only be <6>

R9C5 can only be <7>

R6C6 can only be <1>

R3C4 can only be <7>

R5C1 can only be <2>

R4C7 can only be <7>

R6C4 can only be <2>

R7C6 can only be <3>

R9C9 can only be <2>

R1C5 can only be <5>

R7C4 can only be <1>

R9C1 can only be <4>

R4C3 can only be <6>

R6C7 can only be <3>

R8C7 can only be <1>

R6C3 can only be <7>

R9C7 can only be <8>

R9C3 can only be <1>

R3C1 is the only square in row 3 that can be <6>

R3C8 is the only square in row 3 that can be <8>

R7C7 is the only square in row 7 that can be <6>

R7C8 is the only square in row 7 that can be <4>

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

Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <7>. All other instances of this possibility in columns 2 and 8 can be removed.

R7C2 - removing <7> from <579> leaving <59>

Squares R3C2 and R7C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C2 - removing <5> from <257> leaving <27>

R8C2 - removing <5> from <257> leaving <27>

Squares R2C3 and R2C8 in row 2 and R8C3 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 3 and 8 can be removed.

R3C3 - removing <5> from <345> leaving <34>

Squares R1C1 (XY), R2C2 (XZ) and R1C7 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.

R1C3 - removing <2> from <23> leaving <3>

R2C7 - removing <2> from <24> leaving <4>

R1C9 can only be <7>

R3C3 can only be <4>

R1C1 can only be <9>

R7C9 can only be <5>

R2C8 can only be <5>

R3C7 can only be <9>

R2C3 can only be <2>

R8C8 can only be <7>

R3C9 can only be <3>

R3C2 can only be <5>

R1C7 can only be <2>

R7C2 can only be <9>

R8C2 can only be <2>

R7C1 can only be <7>

R2C2 can only be <7>

R8C3 can only be <5>