CREATE TABLE table_203_536 (id NUMBER, "#" NUMBER, "date" CLOB, "opponent" CLOB, "score" CLOB, "win" CLOB, "loss" CLOB, "save" CLOB, "crowd" NUMBER, "record" CLOB)

which opponent did they play against before the play date of april 12 ?
SELECT "opponent" FROM table_203_536 WHERE id = (SELECT id FROM table_203_536 WHERE "date" = 'apr 12') - 1
SELECT "opponent" FROM "table_203_536" WHERE "id" = (SELECT "id" FROM "table_203_536" WHERE "date" = 'apr 12') - 1