Strategy lessons based on the games of a chess legend The training material is based on 80 games of the legendary positional genius Ulf Andersson, a world elite player from Sweden who reached number four on the FIDE rating list. Kaufeld and Kern have made Andersson s crystal-clear middlegame and endgame technique accessible for club players by grouping them in 15 thematic lessons and pinpointing exactly how Andersson made the difference.