Racist fallacy

Although not always fallacious, a racist fallacy claims someone can't be something because of his race. E.g. trying to find a known person (e.g. Obama), and, when looking for him, saying this white man can't be him because he is another race than the man we are looking for, would not be a fallacy. Saying "he couldn't have won this Starcraft match because he's Black" would be a racist fallacy.
See: Fallacy; Fallacies.