Last candidate 1 in G5 changed to solution Last candidate 8 in B5 changed to solution Last candidate 9 in C5 changed to solution Last candidate 7 in H5 changed to solution

Last candidate 2 in C4 changed to solution Last candidate 5 in C6 changed to solution

2 in A8 is last in column/box
2 in G3 is last in row/box
5 in F9 is last in row/box

5 in G7 is last in row
6 in F8 is last in row/box
8 in A9 is last in box

9 in A7 is last in row/box
9 in D9 is last in column
9 in J4 is last in row/box

7 in C7 is last in box
7 in J9 is last in column
9 in E6 is last in row
9 in F1 is last in column/box

Last candidate 7 in D8 changed to solution Last candidate 1 in J8 changed to solution

Naked Pair 3/6 on cells {B7|B9} means
- 3/6 can be removed from B1
- 3 can be removed from B2

Line/Box Reduction: 4s in box 7 remove the following in the same box:
- 4 can be removed from H3

length=7. This XY-Chain is continuous and one value in each cell must be the solution, so all off-chain candidates can be removed
-4[A3]+7[A3]-7[E3]+8[E3]-8[E4]+7[E4]-7[F4]+3[F4]-3[G4]+4[G4]-4[B4]+1[B4]-1[A6]+4[A6]-4[A3]
- 3 can be removed from D4
- 4 can be removed from A2

length=6, chain ends: B2 and F6
This proves 2 is the solution at one or possibly both ends of the chain
-2[B2]+4[B2]-4[A3]+7[A3]-7[E3]+8[E3]-8[E4]+7[E4]-7[F4]+3[F4]-3[F6]+2[F6]
- 2 can be removed from F2

2 in F6 is last in row

Y-Wing pattern. Hinge: F2 (3/7), wings C2 E3, therefore
- 8 can be removed from C3
- 8 can be removed from D2

8 in C2 is last in column

length=4, chain ends: A3 and F2
This proves 7 is the solution at one or possibly both ends of the chain
-7[A3]+4[A3]-4[B2]+2[B2]-2[D2]+3[D2]-3[F2]+7[F2]
- 7 can be removed from A2
- 7 can be removed from E3
Last candidate 5 in A2 changed to solution Last candidate 8 in E3 changed to solution Last candidate 7 in E4 changed to solution Last candidate 3 in F4 changed to solution Last candidate 4 in G4 changed to solution

Last candidate 1 in A1 changed to solution Last candidate 4 in A6 changed to solution Last candidate 2 in B1 changed to solution Last candidate 4 in B2 changed to solution Last candidate 1 in B4 changed to solution Last candidate 3 in D1 changed to solution Last candidate 2 in D2 changed to solution Last candidate 8 in D4 changed to solution Last candidate 1 in D6 changed to solution Last candidate 7 in F2 changed to solution Last candidate 3 in J2 changed to solution Last candidate 6 in J7 changed to solution Last candidate 7 in A3 changed to solution Last candidate 3 in B7 changed to solution Last candidate 6 in B9 changed to solution Last candidate 6 in C1 changed to solution Last candidate 3 in C3 changed to solution Last candidate 3 in G9 changed to solution Last candidate 8 in H1 changed to solution Last candidate 6 in H3 changed to solution Last candidate 3 in H6 changed to solution Last candidate 4 in H9 changed to solution Last candidate 5 in J1 changed to solution Last candidate 4 in J3 changed to solution

Last candidate 6 in G6 changed to solution