3 in E4 is last in column/box
4 in G3 is last in row
6 in J6 is last in column/box
7 in A8 is last in box

3 in G8 is last in row
8 in H5 is last in box
8 in J2 is last in row

3 in D9 is last in column

Naked Pair 1/2 on cells {B5|G5} means
- 2 can be removed from C5

Hidden Pair 3/6 in Row C, on cells {C3|C7}
- removes 2/5/9 from C3
- removes 2 from C7

Hidden Pair 5/9 in Box 4, on cells {E2|F3}
- removes 2/4 from E2
- removes 1/7 from F3

Hidden Pair 7/9 in Box 8, on cells {H4|J4}
- removes 1/2 from H4
- removes 1/5 from J4

Naked Pair 7/9 on cells {H4|J4} means
- 9 can be removed from A4
- 7/9 can be removed from C4
- 7/9 can be removed from F4

9 in F3 is last in row

Last candidate 5 in E2 changed to solution

5 in B3 is last in column/box

Hidden Pair 5/8 in Box 6, on cells {F7|F8}
- removes 4 from F7

Pair: between Box 3 and Col 7:
- 6 can be removed from D7
- 6 can be removed from H7

Pair: between Box 6 and Row E:
- 6 can be removed from E1

If +1[A4] then -1[F4] forcing +1[F1] which removes all 1s from box 1, so A4 cannot be 1

If +4[F1] then -4[B1] forcing +4[B6] which removes all 4s from box 5, so F1 cannot be 4

If +4[D6] then -4[B6] forcing +4[B1] which removes all 4s from box 4, so D6 cannot be 4

length=5, chain ends: A4 and D7
This proves 2 is the solution at one or possibly both ends of the chain
-2[A4]+4[A4]-4[F4]+1[F4]-1[F1]+7[F1]-7[F9]+4[F9]-4[D7]+2[D7]
- 2 can be removed from A7

Pair: between Box 3 and Row B:
- 2 can be removed from B1
- 2 can be removed from B5
Last candidate 1 in B5 changed to solution Last candidate 2 in G5 changed to solution

length=6, chain ends: A4 and H2
This proves 2 is the solution at one or possibly both ends of the chain
-2[A4]+4[A4]-4[B6]+8[B6]-8[B8]+2[B8]-2[E8]+6[E8]-6[H8]+1[H8]-1[H2]+2[H2]
- 2 can be removed from A2

(RULE 5): Uncoloured candidate 4 in A2 can see coloured 4 elsewhere and an oppositely coloured 9 in its own cell. It can be removed.

4 in D2 is last in column

Last candidate 8 in F8 changed to solution Last candidate 2 in H2 changed to solution Last candidate 7 in H3 changed to solution Last candidate 9 in H4 changed to solution Last candidate 4 in H7 changed to solution Last candidate 6 in H9 changed to solution Last candidate 7 in J4 changed to solution Last candidate 9 in J7 changed to solution Last candidate 2 in B8 changed to solution Last candidate 9 in C2 changed to solution Last candidate 7 in C5 changed to solution Last candidate 5 in C6 changed to solution Last candidate 9 in E5 changed to solution Last candidate 5 in F7 changed to solution Last candidate 1 in G6 changed to solution

Last candidate 1 in A2 changed to solution Last candidate 2 in C4 changed to solution Last candidate 7 in D6 changed to solution Last candidate 4 in E6 changed to solution Last candidate 7 in E9 changed to solution Last candidate 1 in F4 changed to solution Last candidate 4 in F9 changed to solution Last candidate 5 in G4 changed to solution Last candidate 4 in A4 changed to solution Last candidate 8 in B6 changed to solution Last candidate 3 in B7 changed to solution Last candidate 6 in C7 changed to solution Last candidate 2 in E1 changed to solution Last candidate 7 in F1 changed to solution

Last candidate 6 in A1 changed to solution Last candidate 2 in A3 changed to solution Last candidate 9 in A6 changed to solution Last candidate 8 in A7 changed to solution Last candidate 4 in B1 changed to solution Last candidate 3 in C3 changed to solution Last candidate 1 in D1 changed to solution Last candidate 6 in D3 changed to solution Last candidate 3 in J1 changed to solution Last candidate 1 in J3 changed to solution