1 in D2 is last in row/box
5 in F8 is last in row/box
7 in C4 is last in column
7 in F6 is last in box

1 in H8 is last in row
3 in D7 is last in row
3 in E3 is last in box
4 in F5 is last in row
6 in D5 is last in row
8 in D4 is last in box
8 in G6 is last in column

Last candidate 4 in D8 changed to solution

4 in A4 is last in column/box
4 in C3 is last in row
4 in G7 is last in column/box
6 in E1 is last in row/box
6 in J6 is last in column/box

1 in A6 is last in column
3 in J5 is last in row/box
4 in J1 is last in row/column/box

1 in G5 is last in column/box
1 in J3 is last in row

Hidden Pair 6/9 in Box 9, on cells {G8|H9}
- removes 2/7 from G8
- removes 5 from H9

Line/Box Reduction: 2s in box 1 remove the following in the same box:
- 2 can be removed from B1
- 2 can be removed from B2
- 2 can be removed from B3
- 2 can be removed from C2

Line/Box Reduction: 5s in box 1 remove the following in the same box:
- 5 can be removed from A1
- 5 can be removed from A2
- 5 can be removed from C2

Y-Wing pattern. Hinge: C7 (2/5), wings B8 C5, therefore
- 9 can be removed from C8
- 9 can be removed from C9

9 in C5 is last in row

Last candidate 5 in A5 changed to solution

If +6[A9] then -6[A3] forcing +6[G3] which removes all 6s from box 9, so A9 cannot be 6

Pair: between Box 3 and Row C:
- 6 can be removed from C2

length=4, chain ends: E8 and A9
This proves 8 is the solution at one or possibly both ends of the chain
-8[E8]+7[E8]-7[J8]+2[J8]-2[B8]+9[B8]-9[A9]+8[A9]
- 8 can be removed from C8
- 8 can be removed from E9
Last candidate 7 in E9 changed to solution Last candidate 5 in J9 changed to solution

Last candidate 8 in E8 changed to solution Last candidate 2 in H7 changed to solution Last candidate 2 in J4 changed to solution Last candidate 7 in J8 changed to solution Last candidate 5 in C7 changed to solution

length=5, chain ends: G4 and B1
This proves 5 is the solution at one or possibly both ends of the chain
-5[G4]+9[G4]-9[G8]+6[G8]-6[C8]+2[C8]-2[B8]+9[B8]-9[B1]+5[B1]
- 5 can be removed from G1
Last candidate 2 in G1 changed to solution

5 in B1 is last in column

Naked Pair 8/9 on cells {A1|A9} means
- 8 can be removed from A2
- 9 can be removed from A3

BUG+1 found in G2, 6 must be the solution

All other incomplete cells contain two candidates apart from G2. Other candidates in G2 would create two or more solutions so they can be removed.
Last candidate 6 in G2 changed to solution Last candidate 7 in G3 changed to solution Last candidate 9 in G8 changed to solution Last candidate 5 in H2 changed to solution Last candidate 9 in H4 changed to solution Last candidate 6 in H9 changed to solution

Last candidate 2 in A2 changed to solution Last candidate 6 in A3 changed to solution Last candidate 9 in B3 changed to solution Last candidate 2 in B8 changed to solution Last candidate 6 in C8 changed to solution Last candidate 8 in C9 changed to solution Last candidate 8 in F2 changed to solution Last candidate 2 in F3 changed to solution Last candidate 5 in G4 changed to solution Last candidate 8 in A1 changed to solution Last candidate 9 in A9 changed to solution Last candidate 3 in B6 changed to solution Last candidate 3 in C2 changed to solution Last candidate 2 in C6 changed to solution Last candidate 9 in F1 changed to solution

Last candidate 7 in B2 changed to solution