Write SQL query to solve given problem: What is the average winning rate of the Buffalo Sabres in 2000?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(CAST(T2.W AS REAL) / T2.G) / COUNT(T1.oppID) FROM TeamVsTeam AS T1 INNER JOIN Teams AS T2 ON T1.year = T2.year AND T1.tmID = T2.tmID WHERE T2.name = 'Buffalo Sabres' AND T1.year = 2000