CREATE TABLE "1990s_chiefs_18_3" (
  "year" real,
  "date" text,
  "winner" text,
  "result" text,
  "loser" text,
  "location" text
);

Question: Who was the winner of the game in 1999 with Kansas City Chiefs as the loser?
SQL: SELECT "winner" FROM "1990s_chiefs_18_3" WHERE "year"=1999 AND "loser"='kansas city chiefs';

Question: What is the average year of the games with the date December 26?
SQL: SELECT AVG("year") FROM "1990s_chiefs_18_3" WHERE "date"='december 26';