CREATE TABLE table_203_126 (id DECIMAL, "date" TEXT, "opponent#" TEXT, "rank#" TEXT, "site" TEXT, "result" TEXT, "attendance" DECIMAL)

who did ohio state play before indiana on october 23 ?
SELECT "opponent#" FROM table_203_126 WHERE id = (SELECT id FROM table_203_126 WHERE "date" = 'october 23' AND "opponent#" = 'indiana') - 1
SELECT "opponent#" FROM "table_203_126" WHERE "id" = (SELECT "id" FROM "table_203_126" WHERE "date" = 'october 23' AND "opponent#" = 'indiana') - 1