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

### Instruction:
How many rounds did the event rings: king of kings 2000 block a have with a record of 6-1?

### Inputs:
table_name: table, columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']

### Response:
SELECT Round FROM table WHERE Event = rings: king of kings 2000 block a AND Record = 6-1