In a tournament, a team plays \( 10 \) matches with probabilities of winning and losing each match as \( \tfrac{1}{3} \) and \( \tfrac{2}{3} \) respectively. Let \( x \) be the number of matches that the team wins, and \( y \) be the number of matches that team loses. If the probability \( P(|x-y|\le 2) \) is p , then \( 3^{9}p \) equals __________.
