user: Question: What is the distance for the Unnamed race with 3 runners at Newcastle?
Columns: ['Race name', 'Dist (miles)', 'Course', 'Prize', 'Jockey', 'Odds', 'Runners']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Great Subscription Purse', '4', 'York', '£160 5s', 'Christopher Jackson', '1/2', '3']
SQL:

assistant: SELECT "Dist (miles)" FROM "Table" WHERE "Race name" = 'Unnamed race' AND "Runners" = '3' AND "Course" = 'Newcastle';