Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Tournament | Winning score | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- |
| Nov 22, 1964 | Cajun Classic Open Invitational | –7 (72-70-68-67=277) | 5 strokes | Gay Brewer , Jack Nicklaus |
| May 28, 1967 | Oklahoma City Open Invitational | –10 (70-72-68-68=278) | Playoff | Gary Player |
| Apr 28, 1968 | Byron Nelson Golf Classic | –10 (67-68-65-70=270) | 1 stroke | Kermit Zarley |
| Jan 20, 1969 | Kaiser International Open Invitational | –9 (68-67=135) | 1 stroke | Bruce Devlin |
| Apr 20, 1970 | Greater New Orleans Open Invitational | –10 (68-71-69-70=278) | Playoff | Bob Charles , Howie Johnson |
| Jan 24, 1971 | Phoenix Open Invitational | –23 (65-64-67-65=261) | 2 strokes | Billy Casper , Dan Sikes |
| Jan 23, 1972 | Dean Martin Tucson Open | –15 (68-73-67-65=273) | Playoff | George Archer |
| Nov 17, 1973 | World Open Golf Championship | +2 (68-74-73-74-67-73-72-69=570) | 3 strokes | Ben Crenshaw |
| Sep 22, 1974 | Ohio Kings Island Open | –7 (68-68-69-72=277) | 3 strokes | George Johnson |
| Oct 2, 1977 | Anheuser-Busch Golf Classic | –16 (71-66-70-65=272) | 2 strokes | George Archer |
| Jan 15, 1978 | Phoenix Open | –12 (68-69-70-65=272) | 1 stroke | Jerry Pate , Lee Trevino |
Question:
What was the margin of victory when the winning score was –10 (70-72-68-68=278)?
Answer:
Playoff