In which country do most players have the 'slow left-arm chinaman' bowling style?
'slow left-arm chinaman' bowling style refers to Bowling_skill = 'Slow left-arm chinaman'; most players  refers to max(count(Country_Id))
SELECT T3.Country_Name FROM Bowling_Style AS T1 INNER JOIN Player AS T2 ON T1.Bowling_Id = T2.Bowling_skill INNER JOIN Country AS T3 ON T2.Country_Name = T3.Country_Id WHERE T1.Bowling_skill = 'Slow left-arm chinaman'