Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_89 (tie_no INTEGER, away_team VARCHAR)
### Question:
What was the tie number for the round against visiting opponent Chelsea?
### Answer:
SELECT SUM(tie_no) FROM table_name_89 WHERE away_team = "chelsea"