Table: golf_results_26
Columns: date
tournament
winning_score
margin_of_victory
runner_s_up

Question: What was the margin of victory when the winning score was –10 (70-72-68-68=278)?
SQL: SELECT "margin_of_victory" FROM golf_results_26 WHERE "winning_score" = '–10 (70-72-68-68=278)'

Question: When Gary Player was the runner-up, what was the margin of victory?
SQL: SELECT "margin_of_victory" FROM golf_results_26 WHERE "runner_s_up" = 'gary player'

Question: In what tournament was the winning score –10 (68-71-69-70=278)?
SQL: SELECT "tournament" FROM golf_results_26 WHERE "winning_score" = '–10 (68-71-69-70=278)'