Vera Menchik is the longest-reigning women's world chess champion in history, having held the title for 17 years. Her dominance over her contemporaries can be seen in her matches against Sonja Graf. Graf was the second strongest women's player in the world at the time and had been coached by the legendary Siegbert Tarrasch, but looking at both the games and the final result, their playing levels were completely different. In the two matches, Menchik won twelve games to three, with five draws. The fourth world champion, Alekhine, wrote after one of her victories against Sonja Graf in 1939 that "it is totally unfair to persuade a player of an acknowledged superclass like Miss Menchik to defend her title year after year in tournaments composed of very inferior players", the specific tournament in question being the seventh Women's World Chess Championship.