I prayed for certain victory at a shrine.
I saw a person wearing a headband that said "Sure Victory" at the karate match.
If tigers were to go to war against turkeys, it would mean certain victory for the tigers. Chicken farmers would be happy, as well.
A certain win sounds like a great thing. When these two kanji are put together, a certain victory is inevitable.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Take note that the つ in ひつ is turned into a small っ, though.