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

### Instruction:
What is the smallest number of matches with Bonus Pts of 19 and Total Points greater than 421?

### Inputs:
table_name: table, columns: ['Rider', 'Matches', 'Rides', 'Bonus Pts', 'Total Points']

### Response:
SELECT MIN Matches FROM table WHERE Bonus Pts = 19 AND Total Points > 421