CREATE TABLE table_204_157 (id DECIMAL, "date" TEXT, "opponent#" TEXT, "rank#" TEXT, "site" TEXT, "result" TEXT)

how many games did the irish win by at least 30 points ?
SELECT COUNT(*) FROM table_204_157 WHERE "result" - "result" >= 30
SELECT COUNT(*) FROM "table_204_157" WHERE "result" - "result" >= 30