Table schema:
CREATE TABLE table_1506950_9 (player VARCHAR, us_open VARCHAR, pga_ch VARCHAR, masters VARCHAR)

Question: Which player's results were T6 in the PGA Ch., T4 in the Masters and T8 at the U.S. Open?
SQL: SELECT player FROM table_1506950_9 WHERE pga_ch = "T6" AND masters = "T4" AND us_open = "T8"