Identifying the Winning Pitcher in Baseball: A Detailed Explanation

Question
Used three pitchers. First pitcher pitched 3 inn leaving tied 1-1. Next pitcher pitched 3 inn with the score tied 2-2. Game goes extra inning we are visitors and score 4 runs, I bring in third pitcher who allows only 2 runs, we win 6-4.
who is winning pitcher?

Answer
The winning pitcher is always the pitcher of record when you went ahead of the opposing team....So at the time that you actually went ahead in runs who was the official pitcher per the umpire's line up card?

That's your winner....

Thanks, Andy

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