CREATE TABLE table_203_531 (id NUMBER, "date" CLOB, "tournament" CLOB, "location" CLOB, "winner" CLOB, "score" CLOB, "1st prize  ( $ ) " NUMBER)

phil mickelson 's score at the bob hope chrysler minus chris smith 's score at the buick classic .
SELECT (SELECT "score" FROM table_203_531 WHERE "tournament" = 'bob hope chrysler classic') - (SELECT "score" FROM table_203_531 WHERE "tournament" = 'buick classic')
SELECT (SELECT "score" FROM "table_203_531" WHERE "tournament" = 'bob hope chrysler classic') - (SELECT "score" FROM "table_203_531" WHERE "tournament" = 'buick classic')