Samuel was not physically gifted with size, speed, or even looks. He was short and of awkward body. He was not especially coordinate. He was fairly strong, although in a herky-jerky sort of way.
But his mind was powerful. When he was nine years old, he discovered an old chess program on Eli's salvaged computer, and he began playing. Perhaps he did so because he was lonely; he didn't have many friends. But whatever his reasons for starting to play, he took to the game brilliantly - its combination of careful attention to detail, logical chains of reason, and a big picture neatly divided into opening, middle game, and end game. By the time he was twelve, he could beat his computer, and found it very difficult to find anyone to play his favorite game with.