SIATech Pico-Union High School Chess Tournament The Pico-Union High School Chess tournament's goal is to expose students to one of the best games to develop critical thinking skills. It's also an opportunity for students to test their critical thinking skills with their peers through friendly completion. Pico-Union student Yulissa Lopez-Perez playing chess with Mr. N. SIATech Pico-Union High School Student, Andrew Lopez, planning his next move. SIATech CHARTER HIGH SCHOOLS EARN YOUR HIGH SCHOOL DIPLOMA SIATech is a tuition-free high school where students have the opportunity to earn a standard high school diploma. If you are interested in earning a high school diploma, find a SIATech Charter High School near you. Search Schools!