What is the fine-grained topic of the following text: Neph has taught or is currently teaching a multitude of players from all over the Houston area (Spring, Medical Center, Southwest, Katy, Sugar Land, etc) for over 10 years ranging from brand-new beginners to serious contenders who have not only won small scholastic tournaments, but also MAJOR ones, such as the North American Open, netting them several thousand dollar$! Only return the topic.
Neph's Chess Teaching Career in Houston