For Steinitz chess was a science. Positional laws could be identified and learned. He didn't believe in creativity or intuition. There were only hypotheses and proofs. He was concerned with the development of his pieces, strong and weak squares, control of the center, good and bad bishops, pawn structure and other such positional considerations. Steinitz came up with the profound idea that if you have a positional advantage you must attack or risk losing the advantage. After defeating Andersson in a match in 1866, Steinitz announced to the world that he was World Champion. Steinitz was "officially" recognized as World Champion in 1886 when he won the first World Championship match ever to be held, against Johann Zukertort of Poland. Steinitz lost his World Championship title to Lasker in 1894. After a poor performance in London in 1899, Steinitz went insane and died a year later.