No, it is not possible to win a competitive chess game by completing a knight's tour. A knight's tour is a sequence of moves made by a knight on a chessboard in which the knight visits every square on the board exactly once. 
However, a knight's tour is not a valid strategy for winning a game of chess, as the objective of chess is to checkmate your opponent's king, not to visit every square on the board.

In fact, attempting to complete a knight's tour during a competitive chess game would likely be a disadvantageous strategy, as it would take many moves and leave your pieces vulnerable to attack from your opponent. It is much more effective to focus on developing your pieces, controlling the center of the board, and preparing a coordinated attack on your opponent's king. These are the strategies that will give you the best chance of winning a game of chess.
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