user: Question: How many group legs were won with player Mark Dudbridge?
Columns: ['Player', 'Group Legs won', 'Play-Off Legs won', 'Winners Group Legs won', 'Winners Play-Off Legs won', 'Final position money won*', 'Total money won']
Types: ['text', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: ['Mervyn King', 100.0, 20.0, 23.0, 1.0, '£2,500', '£11,900']
SQL:

assistant: SELECT "Winners Group Legs won" FROM "Table" WHERE "Player" = 'Mark Dudbridge';