English Translation
Victory is unlikely but not impossible.
Robotic unnatural translation… My alternative translation is:
勝算は低いが、ゼロではない。（しょうさんはひくいが、…）
勝算（しょうさん）means “a chance to win”. You can find example sentences with 勝算 here. 算数 means “mathematics”, so you may easily catch the nuance of “calculation” behind the term 勝算.
We usually spell “zero” as ゼロ in Katakana rather than 0 in Arabic number in this context because ゼロ is compared with 低い (low; an adjective).