Copyright © Kevin Stone

R2C9 can only be <1>

R6C6 can only be <5>

R4C6 can only be <9>

R2C6 can only be <4>

R8C6 can only be <8>

R5C5 is the only square in row 5 that can be <8>

R5C2 is the only square in row 5 that can be <9>

R8C5 is the only square in row 8 that can be <6>

R6C2 is the only square in column 2 that can be <4>

Squares R5C3 and R5C7 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C1 - removing <3> from <35> leaving <5>

R5C8 - removing <13> from <12345> leaving <245>

R4C8 is the only square in row 4 that can be <5>

Squares R4C4 and R6C4 in column 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C4 - removing <3> from <359> leaving <59>

R8C4 - removing <1> from <159> leaving <59>

Squares R2C3<37>, R2C4<59>, R2C5<3579> and R2C7<39> in row 2 form a comprehensive locked quad. These 4 squares can only contain the 4 possibilities <3579>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <3> from <23> leaving <2>

R2C2 - removing <37> from <23678> leaving <268>

R2C8 - removing <39> from <3689> leaving <68>

R8C1 can only be <3>

Squares R7C2 and R8C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C2 - removing <17> from <1257> leaving <25>

R9C2 - removing <1> from <125> leaving <25>

Squares R5C3 and R8C3 in column 3 and R5C7 and R8C7 in column 7 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in rows 5 and 8 can be removed.

R8C8 - removing <1> from <12479> leaving <2479>

Squares R2C3 and R5C3 in column 3 and R2C7 and R5C7 in column 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 2 and 5 can be removed.

R2C5 - removing <3> from <3579> leaving <579>

Squares R3C5 and R3C8 in row 3 and R7C5 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 5 and 8 can be removed.

R2C5 - removing <9> from <579> leaving <57>

R8C8 - removing <9> from <2479> leaving <247>

Squares R5C8, R5C9, R8C8 and R8C9 form a Type-1 Unique Rectangle on <24>.

R8C8 - removing <24> from <247> leaving <7>

R8C3 can only be <1>

R8C7 can only be <9>

R5C3 can only be <3>

R7C2 can only be <7>

R8C4 can only be <5>

R2C7 can only be <3>

R7C8 can only be <1>

R2C3 can only be <7>

R5C7 can only be <1>

R1C8 can only be <6>

R4C2 can only be <1>

R6C8 can only be <3>

R6C4 can only be <1>

R7C5 can only be <9>

R9C8 can only be <2>

R8C2 can only be <2>

R2C4 can only be <9>

R9C5 can only be <1>

R9C2 can only be <5>

R5C8 can only be <4>

R8C9 can only be <4>

R1C2 can only be <3>

R2C8 can only be <8>

R2C5 can only be <5>

R3C5 can only be <3>

R2C2 can only be <6>

R3C8 can only be <9>

R3C2 can only be <8>

R1C5 can only be <7>

R4C4 can only be <3>

R5C9 can only be <2>