Say they throw a punch to my midsection, I would block with the elbow, by striking the top of the hand. I would keep my elbow there, controlling where the move their hand. It effectively keeps them from striking, because the second they break contact toward me I can easily trap and break the are with the elbow by pulling it down and in.I hope that description helps.
I've always enjoyed thinking that if we are not fighting for survival, we are still fighting for a reason. Fighting without it has no direction. Winning is not an apt enough word to me, but when sparring I have found, between equals, the expression is of one's will through the physical chessmatch. There's a space where you really flow with the strikes, and see each other. I am very good at reading body language, which also helps to give the feeling of knowing the other in combat.
I would like to think the person who triumps, does so not only through technique, but also strength of will.