Jarecki was the Chief Arbiter at the PCA World Chess Championship match in 1995 between World Chess Champion Garry Kasparov and challenger Viswanathan Anand, which was held in New York City at the top of the World Trade Center. Jarecki was the arbiter and referee for the second match between Kasparov and the IBM supercomputer program Deep Blue in 1997 in New York City, as well as the two Intel Grand Prix matches held there. She was the head arbiter for the HB Global Chess Challenge, Minneapolis 2005, which had the richest prize fund ($500,000) for an Open tournament in chess history.