Question: Name the margin of victory when the number is 15
SQL: SELECT "Margin of victory" FROM "1-1569625-1" WHERE "No." = 15.0;

Question: Name the number of numbers for Howard Clark
SQL: SELECT COUNT("No.") FROM "1-1569625-1" WHERE "Runner(s)-up" = 'Howard Clark';

Question: Name the margin of victory when tournament is Algarve Open de Portugal
SQL: SELECT "Margin of victory" FROM "1-1569625-1" WHERE "Tournament" = 'Algarve Open de Portugal';

Question: Name the tournament when margin of victory is 3 strokes and winning score is 71-66-70-67=274
SQL: SELECT "Tournament" FROM "1-1569625-1" WHERE "Margin of victory" = '3 strokes' AND "Winning score" = '71-66-70-67=274';