Need helps whit sql querry : I have this data base.

**Users**:
          
      Nick     CodCountry    BirthDate

      Chekov		1	     2001-09-15
      Kirk		    1	     1982-01-27
      McCoy		    3	     2002-02-12
      Scott		    3	     2001-03-31
      Spock		    2	     2002-02-12
      Sulu		    4	     1991-05-02
      Uhura  	    2	     1989-12-21


**Play**:

      Nick    CodTrivia   MoneyEarned

      Chekov	  2	           5         
      Kirk	      1	           500       
      Kirk	      3	           400       
      Kirk     	  4	           200       
      Kirk	      7	           300       
      McCoy	      2	           15        
      McCoy	      6	           10        
      Scott	      6	           25        
      Spock	      2	           50        
      Spock	      6	           50        
      Sulu	      1	           200       
      Sulu	      4	           500       
      Sulu	      7	           500       
      Uhura	      3	           200       
      Uhura	      7	           0         


and i need to :  List the users who reached the end of more trivia without having lost.

So far i have this:

select * 
from usuario 
where nick in ( select nick from participa where MontoAcumulado>0 group by nick having count(nick) =(select top 1 count(nick)))


But my mind go blank after that...can some one help me?

Pd: it need to show Kirk because he win 4 time
   

