Here you will need two chains that link together. If you have cells same coloured cells in the same chain that liked directly with two cells of a different chain that is not the same colour.
In this example Reds of the chain are in a row with light Grey/green and in a block with Light blue off chain(2). This mean that the numbers can be eliminate in the first chain with the Red colour.
In This example the one red is liked to chain 2 (Light Grey/Green) and chain 2 (Light Bleu)and therefore can not be 3.
Eliminations marked in brown.