3 in A8 is last in column
4 in F2 is last in column
4 in H1 is last in row/box
5 in A9 is last in column
7 in A6 is last in column

7 in C1 is last in row/box
8 in D8 is last in column
8 in H3 is last in row/box

7 in G3 is last in column/box
7 in H7 is last in row
8 in A7 is last in row
8 in B2 is last in box

4 in A5 is last in row
5 in J7 is last in column/box
9 in G5 is last in row

6 in G9 is last in row/box

Naked Pair 1/2 on cells {H4|H8} means
- 1/2 can be removed from H5

Naked Pair 3/5 on cells {H5|H6} means
- 3 can be removed from J5
- 3 can be removed from J6
Last candidate 6 in J6 changed to solution

Hidden Pair 7/8 in Box 5, on cells {E5|F5}
- removes 5 from E5
- removes 6 from F5

5 in E3 is last in row

Hidden Pair 3/7 in Box 6, on cells {E9|F9}
- removes 2 from E9
- removes 1 from F9

Pair: between Box 1 and Col 3:
- 6 can be removed from D3
- 6 can be removed from F3

If +1[J3] then -1[A3] forcing +1[A4] which removes all 1s from Box 8, so J3 cannot be 1

X-Cycle Rule 1:-1[A3]+1[A4]-1[H4]+1[J5]-1[J2]+1[C2]-1[A3]
- Off-chain 1 taken off B4 - weak link: (1)A4 - to (1)H4 =
- Off-chain 1 taken off J1 - weak link: (1)J5 - to (1)J2 =
- Off-chain 1 taken off B3 - weak link: (1)C2 - to (1)A3 =

length=4, chain ends: C9 and E7
This proves 2 is the solution at one or possibly both ends of the chain
-2[C9]+1[C9]-1[C2]+3[C2]-3[E2]+9[E2]-9[E7]+2[E7]
- 2 can be removed from B7
- 2 can be removed from C7
- 2 can be removed from D9

1 cannot be set in the yellow cells {B1,B2,B3} and with the Remote Pair in A4 and C7 it means:
- 6 can be removed from C5

6 in C7 is last in row

length=4, chain ends: D5 and B3
This proves 6 is the solution at one or possibly both ends of the chain
-6[D5]+5[D5]-5[D6]+9[D6]-9[B6]+3[B6]-3[B3]+6[B3]
- 6 can be removed from B5

6 in D5 is last in column

Last candidate 9 in F4 changed to solution

Last candidate 5 in D6 changed to solution
Last candidate 1 in F7 changed to solution

Last candidate 4 in B7 changed to solution
Last candidate 4 in D9 changed to solution
Last candidate 3 in F3 changed to solution
Last candidate 3 in H6 changed to solution

Last candidate 6 in B3 changed to solution
Last candidate 9 in B6 changed to solution
Last candidate 9 in E2 changed to solution
Last candidate 7 in F9 changed to solution
Last candidate 5 in H5 changed to solution

Last candidate 1 in A3 changed to solution
Last candidate 2 in B4 changed to solution
Last candidate 2 in E7 changed to solution
Last candidate 3 in E9 changed to solution
Last candidate 8 in F5 changed to solution

Last candidate 6 in A4 changed to solution
Last candidate 1 in B9 changed to solution
Last candidate 3 in C2 changed to solution
Last candidate 2 in D3 changed to solution
Last candidate 9 in D7 changed to solution
Last candidate 8 in E1 changed to solution
Last candidate 7 in E5 changed to solution
Last candidate 6 in F1 changed to solution
Last candidate 1 in H4 changed to solution

Last candidate 3 in B5 changed to solution
Last candidate 1 in C5 changed to solution
Last candidate 2 in C9 changed to solution
Last candidate 1 in D1 changed to solution
Last candidate 2 in H8 changed to solution
Last candidate 1 in J2 changed to solution
Last candidate 9 in J3 changed to solution
Last candidate 2 in J5 changed to solution

Last candidate 2 in G1 changed to solution
Last candidate 1 in G8 changed to solution
Last candidate 3 in J1 changed to solution