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Simply put: Those who 'trust to luck'... lose.

As a nihilist, Nietzsche believed that the weak deserve their fate, because they were not strong enough to take what they wanted. By limiting themselves to outdated morals and religions, the weak crippled themselves. The strong, then, prospered, because they had no such limitations. Because he saw life as a zero-sum game, Nietzsche believed the strong would always be victorious over the weak. Thus, whether you succeeded or not depended not on luck, but whether you chose to be strong or weak.

All of these answers are at least partially wrong. "No victor believes in chance" means that victors prefer to believe that victory was the result of their preparation, their skill, or divine providence, and discount the role that luck (i.e., unearned fortune) played in victory. Victory is validation of their skill, cunning, courage, and worth, his moral superiority. To acknowledge the role of chance in victory puts that sense of superiority into question.

The one that wins did not trust in luck, or the stars, or fate. The one who wins leaves nothing to chance. They observe, they calculate, they plan and they execute with precison and exactitude.

Champions rely on strategy and individual ability, and not luck.