CREATE TABLE "table1_1506950_9" (
  "nationality" text,
  "player" text,
  "year" real,
  "wins" real,
  "masters" text,
  "u_s_open" text,
  "open_ch" text,
  "pga_ch" text
);

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 "table1_1506950_9" WHERE "pga_ch"='T6' AND "masters"='T4' AND "u_s_open"='T8';

Question: What is the result at the Masters for the player who finished R16 at the PGA Ch.?
SQL: SELECT "masters" FROM "table1_1506950_9" WHERE "pga_ch"='R16';

Question: What was the player's result at the U.S. Open of the player who finished 6th at the Open Ch?
SQL: SELECT "u_s_open" FROM "table1_1506950_9" WHERE "open_ch"='6th';