Why does Ender Wiggin win all the time? He is always outmatched, and yet he always wins. His strategy seems to be based on completely destroying the opponent, but that strategy is usually used by those who have the advantage. How does Ender win even when he is at a disadvantage, especially when he fights like someone who has the advantage?
The blurb for the novel basically tells you everything that you need to know about Ender. He's a genetically-engineered genius super-soldier that has been raised to fear failure, to the point where he is willing to 'think the unthinkable' in order to win; Studying his enemy's tactics, bending the rules of combat to their breaking point, and offering his opponents (human and alien) unimagined levels of violence.
In order to develop a secure defense against a hostile alien race's next attack, government agencies breed child geniuses and train them as soldiers. A brilliant young boy, Andrew "Ender" Wiggin lives with his kind but distant parents, his sadistic brother Peter, and the person he loves more than anyone else, his sister Valentine. Peter and Valentine were candidates for the soldier-training program but didn't make the cut--young Ender is the Wiggin drafted to the orbiting Battle School for rigorous military training. Ender's skills make him a leader in school and respected in the Battle Room, where children play at mock battles in zero gravity.
Is Ender the general Earth needs? But Ender is not the only result of the genetic experiments. The war with the Buggers has been raging for a hundred years, and the quest for the perfect general has been underway for almost as long. Ender's two older siblings are every bit as unusual as he is, but in very different ways. Between the three of them lie the abilities to remake a world. If the world survives, that is.