  We have undertaken a long-term project, Planets in Stellar Clusters Extensive
Search (PISCES), to search for transiting planets in open clusters. In this
paper we present the results for NGC 188, an old, rather populous cluster. We
have monitored the cluster for more than 87 hours, spread over 45 nights. We
have not detected any good transiting planet candidates. We have discovered 18
new variable stars in the cluster, bringing the total number of identified
variables to 46, and present for them high precision light curves, spanning 15
months.
