These changes made most of the older chess culture obsolete. The slow development in the openings was replaced by gambits and rapid attacks. The relative values of the pieces are changed. The game can now only be won by mate or resignation by one of the players. Originally, this was not seen as a problem, but as technique improved, so did the number of draws. This became a matter for discussion in the early 20th century. The limited number of ways to win changed what players needed to win in the endgame; many endgames which could be won with the old rules now were drawn.