Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
For which network was Chris Walby the color commentator after 1990?

### Inputs:
table_name: table, columns: ['Year', 'Network', 'Play-by-play', 'Colour commentator(s)', 'Pregame host']

### Response:
SELECT Network FROM table WHERE Year > 1990 AND Colour commentator(s) = chris walby