The world's first chess tournament was held at the Royal Court in Madrid in 1575. Polerio and Leonardo defeated Ruy Lopez and Ceron in a series of matches arranged by King Phillip II. The first national tournament held in the U.S. was the American Chess Congress, held in New York in 1857 and won by Paul Morphy. First prize was a silver service valued at $300. The most grueling international tournament ever held was at Jurata, Poland in 1937. The 22 masters had to play 21 games in 14 days with no adjournments. In 2005, 1,514 players entered the HB Global Chess Challenge in Minneapolis, the most players ever to compete in one tournament at the master level. In 2004, the UK Challenge Tournament had over 71,000 chessplayers, the largest tournament in the world Over 2,000 schools participated.