R1C9 is the only square in row 1 that can be <2>

R9C9 can only be <9>

R8C9 can only be <4>

R3C9 can only be <1>

R5C9 can only be <5>

R1C5 is the only square in row 1 that can be <8>

R9C1 is the only square in row 9 that can be <7>

Squares R1C1 and R1C4 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C2 - removing <14> from <1347> leaving <37>

R1C3 - removing <1> from <137> leaving <37>

Squares R3C7 and R3C8 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C3 - removing <6> from <356> leaving <35>

R3C5 - removing <4> from <3459> leaving <359>

R2C3 is the only square in block 1 that can be <6>

R4C3 can only be <9>

R7C1 is the only square in column 1 that can be <9>

R5C1 is the only square in column 1 that can be <8>

R3C3 is the only square in column 3 that can be <5>

R6C5 is the only square in column 5 that can be <5>

Squares R7C5 and R9C5 in column 5 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 column.

R4C5 - removing <6> from <346> leaving <34>

R5C5 - removing <16> from <13469> leaving <349>

Squares R3C7 and R3C8 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C7 - removing <4> from <478> leaving <78>

R2C8 - removing <4> from <478> leaving <78>

Squares R7C5 and R9C5 in block 8 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.

R7C4 - removing <16> from <126> leaving <2>

R9C6 - removing <1> from <128> leaving <28>

R9C6 can only be <8>

R4C8 is the only square in row 4 that can be <2>

R9C8 can only be <6>

R9C5 can only be <1>

R9C7 can only be <2>

R3C8 can only be <4>

R3C7 can only be <6>

R6C8 can only be <7>

R2C8 can only be <8>

R5C8 can only be <3>

R7C5 can only be <6>

R2C7 can only be <7>

R4C5 is the only square in row 4 that can be <3>

R3C5 can only be <9>

R3C6 can only be <3>

R5C5 can only be <4>

R5C7 can only be <9>

R4C4 can only be <6>

R6C7 can only be <4>

R6C2 can only be <1>

R4C2 can only be <4>

R5C4 can only be <1>

R5C3 can only be <7>

R5C6 can only be <2>

R1C4 can only be <4>

R6C6 can only be <9>

R7C2 can only be <3>

R8C6 can only be <5>

R7C7 can only be <8>

R1C2 can only be <7>

R8C2 can only be <2>

R8C3 can only be <8>

R7C3 can only be <1>

R8C7 can only be <3>

R8C4 can only be <9>

R2C6 can only be <1>

R1C3 can only be <3>

R5C2 can only be <6>

R1C1 can only be <1>

R2C4 can only be <5>

R2C1 can only be <4>