CREATE TABLE table_204_836 (id DECIMAL, "#" DECIMAL, "date" TEXT, "opponent" TEXT, "score" TEXT, "result" TEXT, "competition" TEXT)

who was the opponent after guinea in 1989 ?
SELECT "opponent" FROM table_204_836 WHERE "#" = (SELECT "#" FROM table_204_836 WHERE "opponent" = 'guinea' AND "date" = 1989) + 1
SELECT "opponent" FROM "table_204_836" WHERE "#" = (SELECT "#" FROM "table_204_836" WHERE "date" = 1989 AND "opponent" = 'guinea') + 1