5 in D1 is last in column/box
5 in E8 is last in row
6 in A8 is last in column/box
7 in F7 is last in column/box

2 in E5 is last in row
5 in A9 is last in column
7 in A4 is last in column
9 in F9 is last in box

7 in C3 is last in row/column/box
8 in A5 is last in row
8 in F4 is last in column

8 in D2 is last in row/box

Naked Pair 1/3 on cells {F1|F8} means
- 1/3 can be removed from F2
- 1/3 can be removed from F5

Naked Pair 4/6 on cells {F5|H5} means
- 6 can be removed from B5
- 4 can be removed from C5
- 4 can be removed from D5
- 4/6 can be removed from G5
- 4 can be removed from J5

4 in C6 is last in row/box

4 in D3 is last in row
4 in F5 is last in box

Last candidate 4 in H4 changed to solution Last candidate 1 in G4 changed to solution

6 in G3 is last in row/column/box

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

(Col->Row) 2 taken off G1, based on BH19
(Col->Row) 2 taken off C9, based on BH19
(Col->Row) 2 taken off D9, based on BH19

2 in D8 is last in row/box

If +3[B1] then -3[B4] forcing +3[E4] which removes all 3s from box 4, so B1 cannot be 3

If +3[B9] then -3[D9] forcing +3[D5] which removes all 3s from box 2, so B9 cannot be 3

Line/Box Reduction: 3s in box 2 remove the following in the same box:
- 3 can be removed from C5

length=6. This XY-Chain is continuous and one value in each cell must be the solution, so all off-chain candidates can be removed
-9[B1]+2[B1]-2[B9]+1[B9]-1[D9]+3[D9]-3[F8]+1[F8]-1[F1]+3[F1]-3[G1]+9[G1]-9[B1]
- 1 can be removed from C9
- 3 can be removed from J1
- 9 can be removed from J1

If +1[B6] then -1[B9] forcing +1[D9] which removes all 1s from box 5, so B6 cannot be 1

Pair: between Box 2 and Col 5:
- 1 can be removed from D5

If +9[G5] then -9[G1] forcing +9[B1] which removes all 9s from box 2, so G5 cannot be 9
Last candidate 5 in G5 changed to solution

5 in J7 is last in row/column/box

Naked Pair 7/9 on cells {J5|J6} means
- 9 can be removed from J2
- 9 can be removed from J3

Y-Wing pattern. Hinge: H9 (2/8), wings C9 G7, therefore
- 3 can be removed from A7
- 3 can be removed from C7
Last candidate 9 in A7 changed to solution Last candidate 2 in C7 changed to solution Last candidate 3 in G7 changed to solution Last candidate 4 in G8 changed to solution Last candidate 8 in J8 changed to solution

Last candidate 1 in B9 changed to solution Last candidate 3 in C8 changed to solution Last candidate 8 in C9 changed to solution Last candidate 3 in D9 changed to solution Last candidate 1 in F8 changed to solution Last candidate 9 in G1 changed to solution Last candidate 2 in G2 changed to solution Last candidate 8 in H1 changed to solution Last candidate 2 in H9 changed to solution Last candidate 1 in J1 changed to solution Last candidate 3 in J3 changed to solution Last candidate 1 in A3 changed to solution Last candidate 2 in B1 changed to solution Last candidate 9 in C2 changed to solution Last candidate 1 in C5 changed to solution Last candidate 7 in D5 changed to solution Last candidate 1 in D6 changed to solution Last candidate 9 in E3 changed to solution Last candidate 6 in E6 changed to solution Last candidate 3 in F1 changed to solution Last candidate 4 in J2 changed to solution Last candidate 9 in J5 changed to solution Last candidate 7 in J6 changed to solution

Last candidate 3 in A2 changed to solution Last candidate 3 in B5 changed to solution Last candidate 9 in B6 changed to solution Last candidate 1 in E2 changed to solution Last candidate 3 in E4 changed to solution Last candidate 6 in B4 changed to solution