Real Sociedad moved closer to a Champions League spot by defeating Las Palmas 1-0 after a blunder by the home side’s goalkeeper in the Spanish league on Friday. Veteran midfielder Xabi Prieto scored the 74th-minute winner from just outside the area after Las Palmas goalie Geronimo Rulli made a mistake and passed the ball right to Prieto’s feet when under pressure from another Real Sociedad player inside the box.