Pairing system invented by Dr. J. Muller of Brugg, Switzerland, and first used in a chess tournament at Zurich in 1895. George Koltanowski introduced the Swiss System in the United States. The first use of the Swiss system in the United States was the Texas Championship in 1942. The first national event to use the Swiss system was the 1945 U.S. Intercollegiate Championship followed by the 1947 U.S. Open in Corpus Christi. Since 1947 every U.S. Open has been conducted under the Swiss System. The first Swiss System Olympiad was Buenos Aires in 1978.