Last candidate 3 in B8 changed to solution Last candidate 5 in C1 changed to solution

1 in A5 is last in column/box
1 in B2 is last in row
4 in F1 is last in column/box

Last candidate 8 in A1 changed to solution Last candidate 7 in J1 changed to solution Last candidate 1 in G1 changed to solution

1 in H9 is last in row/box
5 in J5 is last in column
9 in H2 is last in column

5 in H3 is last in row/box

3 in H6 is last in row

3 in C5 is last in row/column/box

2 in G5 is last in column

2 in J7 is last in row/box

4 in J9 is last in row/box

Last candidate 9 in C9 changed to solution Last candidate 5 in B7 changed to solution Last candidate 2 in C3 changed to solution

Last candidate 9 in A3 changed to solution Last candidate 7 in A9 changed to solution

2 in A6 is last in row/column/box
3 in J3 is last in row
5 in A4 is last in row/column/box

Naked Pair 6/8 on cells {H4|J6} means
- 6/8 can be removed from G4
- 6/8 can be removed from G6

Hidden Pair 4/7 in Box 5, on cells {E4|E6}
- removes 6/8 from E4
- removes 6/8 from E6

Naked Pair 4/7 on cells {E4|E6} means
- 7 can be removed from E3
- 4 can be removed from E7
- 4/7 can be removed from E8

length=5, chain ends: F5 and H8
This proves 8 is the solution at one or possibly both ends of the chain
-8[F5]+9[F5]-9[F7]+1[F7]-1[E7]+3[E7]-3[G7]+6[G7]-6[H8]+8[H8]
- 8 can be removed from F8

length=5, chain ends: G3 and F5
This proves 8 is the solution at one or possibly both ends of the chain
-8[G3]+6[G3]-6[G7]+3[G7]-3[E7]+1[E7]-1[F7]+9[F7]-9[F5]+8[F5]
- 8 can be removed from F3

length=5, chain ends: E8 and F5
This proves 8 is the solution at one or possibly both ends of the chain
-8[E8]+2[E8]-2[F8]+7[F8]-7[F3]+1[F3]-1[F7]+9[F7]-9[F5]+8[F5]
- 8 can be removed from E5
Last candidate 6 in E5 changed to solution

length=4. This XY-Chain is continuous and one value in each cell must be the solution, so all off-chain candidates can be removed
-8[E3]+1[E3]-1[F3]+7[F3]-7[F8]+2[F8]-2[E8]+8[E8]-8[E3]
- 8 can be removed from E2
- 8 can be removed from E9

Y-Wing pattern. Hinge: E8 (2/8), wings D9 E2, therefore
- 5 can be removed from D2
- 5 can be removed from E9
Last candidate 3 in E9 changed to solution Last candidate 8 in G9 changed to solution Last candidate 6 in H8 changed to solution

Last candidate 4 in A8 changed to solution Last candidate 5 in D9 changed to solution Last candidate 1 in E7 changed to solution Last candidate 9 in F7 changed to solution Last candidate 6 in G3 changed to solution Last candidate 3 in G7 changed to solution Last candidate 8 in H4 changed to solution Last candidate 8 in J2 changed to solution Last candidate 6 in J6 changed to solution Last candidate 6 in A7 changed to solution Last candidate 9 in B4 changed to solution Last candidate 8 in B6 changed to solution Last candidate 4 in C6 changed to solution Last candidate 6 in D2 changed to solution Last candidate 4 in D7 changed to solution Last candidate 8 in E3 changed to solution Last candidate 7 in E6 changed to solution Last candidate 2 in E8 changed to solution Last candidate 2 in F2 changed to solution Last candidate 8 in F5 changed to solution Last candidate 7 in F8 changed to solution Last candidate 7 in G4 changed to solution Last candidate 9 in G6 changed to solution

Last candidate 6 in C4 changed to solution Last candidate 7 in D3 changed to solution Last candidate 9 in D5 changed to solution Last candidate 8 in D8 changed to solution Last candidate 5 in E2 changed to solution Last candidate 4 in E4 changed to solution Last candidate 1 in F3 changed to solution