CREATE TABLE table_203_486 (id DECIMAL, "place" DECIMAL, "team" TEXT, "matches" DECIMAL, "won" DECIMAL, "drawn" DECIMAL, "lost" DECIMAL, "difference" TEXT, "points" DECIMAL)

during the 1951 world ice hockey championships , what was the difference between the first and last place teams for number of games won ?
SELECT (SELECT "won" FROM table_203_486 ORDER BY "place" LIMIT 1) - (SELECT "won" FROM table_203_486 ORDER BY "place" DESC LIMIT 1)
SELECT (SELECT "won" FROM "table_203_486" ORDER BY "place" NULLS FIRST LIMIT 1) - (SELECT "won" FROM "table_203_486" ORDER BY "place" DESC NULLS LAST LIMIT 1)