Copyright © Kevin Stone

R1C7 can only be <4>

R8C1 can only be <4>

R3C7 can only be <8>

R6C7 can only be <3>

R9C7 can only be <1>

R1C4 is the only square in row 1 that can be <1>

R2C3 is the only square in row 2 that can be <8>

R3C2 is the only square in row 3 that can be <4>

R4C2 is the only square in row 4 that can be <1>

R5C8 is the only square in row 5 that can be <1>

R6C5 is the only square in row 6 that can be <9>

R6C4 is the only square in row 6 that can be <2>

R8C3 is the only square in row 8 that can be <1>

R1C2 is the only square in column 2 that can be <2>

R5C2 is the only square in block 4 that can be <3>

R5C9 is the only square in row 5 that can be <6>

Squares R3C3 and R3C9 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C5 - removing <57> from <23567> leaving <236>

R3C6 - removing <57> from <2357> leaving <23>

R3C8 - removing <57> from <567> leaving <6>

Squares R7C1 and R9C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C1 - removing <5> from <578> leaving <78>

R6C1 - removing <5> from <578> leaving <78>

Squares R5C1 and R6C1 in block 4 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 block.

R6C3 - removing <7> from <567> leaving <56>

R6C1 is the only square in row 6 that can be <7>

R5C1 can only be <8>

R6C8 is the only square in row 6 that can be <8>

R4C9 can only be <5>

R4C5 can only be <3>

R3C9 can only be <7>

R3C3 can only be <5>

R1C9 can only be <9>

R4C4 can only be <8>

R3C5 can only be <2>

R9C9 can only be <3>

R2C8 can only be <5>

R2C2 can only be <9>

R1C3 can only be <7>

R6C3 can only be <6>

R3C6 can only be <3>

R6C2 can only be <5>

R9C3 can only be <9>

R7C9 can only be <8>

R1C6 can only be <5>

R5C6 can only be <7>

R8C2 can only be <6>

R8C5 can only be <7>

R8C4 can only be <3>

R8C8 can only be <9>

R2C5 can only be <6>

R8C6 can only be <8>

R7C8 can only be <4>

R9C6 can only be <2>

R7C3 can only be <3>

R9C1 can only be <5>

R7C6 can only be <9>

R2C4 can only be <7>

R7C4 can only be <5>

R9C8 can only be <7>

R9C5 can only be <4>

R7C1 can only be <2>

R9C4 can only be <6>

R5C5 can only be <5>

R5C4 can only be <4>