user: Question: Which tournament had a runner-up of Val Skinner?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sep 7, 1987', 'Rail Charity Golf Classic', '–8 (69-74-67-69=279)', '1 stroke', 'Nancy Lopez']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Runner(s)-up" = 'Val Skinner';