R2C6 can only be <8>

R5C4 can only be <8>

R6C8 can only be <8>

R5C6 can only be <1>

R8C6 can only be <9>

R8C4 can only be <5>

R4C5 can only be <3>

R6C5 can only be <9>

R6C2 can only be <7>

R8C5 can only be <8>

R2C4 can only be <4>

R7C5 can only be <7>

R4C8 can only be <2>

R5C5 can only be <6>

R4C2 can only be <8>

R1C1 is the only square in row 1 that can be <7>

R2C8 is the only square in row 2 that can be <6>

R7C1 is the only square in row 7 that can be <6>

R9C8 is the only square in row 9 that can be <7>

R9C9 is the only square in row 9 that can be <9>

R8C8 is the only square in column 8 that can be <1>

Squares R2C1 and R2C5 in row 2 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 row.

R2C2 - removing <25> from <1235> leaving <13>

R2C9 - removing <2> from <123> leaving <13>

Intersection of row 7 with block 9. The value <4> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C9 - removing <4> from <234> leaving <23>

Squares R2C2 and R2C9 in row 2 and R8C2 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 2 and 9 can be removed.

R1C2 - removing <3> from <2345> leaving <245>

R1C9 - removing <3> from <2348> leaving <248>

R9C2 - removing <3> from <135> leaving <15>

Squares R2C1, R2C5, R3C1 and R3C5 form a Type-1 Unique Rectangle on <25>.

R3C1 - removing <25> from <2458> leaving <48>

Squares R5C7, R5C8, R1C7 and R1C8 form a Type-1 Unique Rectangle on <34>.

R1C7 - removing <34> from <23458> leaving <258>

Squares R7C3 (XY), R5C3 (XZ) and R9C1 (YZ) form an XY-Wing pattern on <5>. All squares that are buddies of both the XZ and YZ squares cannot be <5>.

R9C3 - removing <5> from <1358> leaving <138>

Squares R8C1 (XY), R7C3 (XZ) and R3C1 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.

R3C3 - removing <8> from <1258> leaving <125>

R9C1 - removing <8> from <58> leaving <5>

R1C3 - removing <8> from <2358> leaving <235>

R9C2 can only be <1>

R2C1 can only be <2>

R2C2 can only be <3>

R2C5 can only be <5>

R8C1 can only be <4>

R2C9 can only be <1>

R1C3 can only be <5>

R3C5 can only be <2>

R8C2 can only be <2>

R3C1 can only be <8>

R8C9 can only be <3>

R5C2 can only be <5>

R7C3 can only be <8>

R9C7 can only be <8>

R9C3 can only be <3>

R1C2 can only be <4>

R1C7 can only be <2>

R3C3 can only be <1>

R5C3 can only be <2>

R7C7 can only be <4>

R3C9 can only be <4>

R3C7 can only be <5>

R1C9 can only be <8>

R7C9 can only be <2>

R1C8 can only be <3>

R5C7 can only be <3>

R5C8 can only be <4>