CREATE TABLE table_203_750 (id NUMBER, "#" NUMBER, "date" CLOB, "venue" CLOB, "opponent" CLOB, "score" CLOB, "result" CLOB, "competition" CLOB)

number of different teams listed on the chart
SELECT COUNT(DISTINCT "opponent") FROM table_203_750
SELECT COUNT(DISTINCT "opponent") FROM "table_203_750"