Cash in User Games Odd Rows

CREATE FUNCTION ufn_CashInUsersGames(@gameName NVARCHAR(50))
RETURNS TABLE
AS
RETURN SELECT(SELECT SUM([Cash]) AS [SumCash]
                FROM
                    (SELECT ROW_NUMBER() OVER (PARTITION BY [g].[Name] ORDER BY [ug].[Cash] DESC) AS [Row]
                            ,[g].[Name] AS [Game Name]
                            ,[ug].[Cash]
                        FROM [UsersGames] AS [ug]
                        JOIN [Games] AS [g] ON [ug].[GameId] = [g].[Id]
                        WHERE [g].[Name] = @gameName
                     ) AS [Rows]
                WHERE [Row] % 2 <> 0
              ) AS [SumCash]