count winning games

/**
 * winCount
 * returns the count of all games that the human player won.  
 *
 * @returns int
 */
+(int) winCount {
	NSError *error;
	NSManagedObjectContext *context = [(BFHeartsAppDelegate *)[UIApplication sharedApplication].delegate managedObjectContext];
	NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"GameFinalScore" inManagedObjectContext:context];
	NSFetchRequest *req = [[NSFetchRequest alloc] init];
	[req setEntity:entityDesc];
	
	NSPredicate *onlywins = [NSPredicate predicateWithFormat:@"playerWon == YES"];
	[req setPredicate:onlywins];
	NSUInteger cnt = [context countForFetchRequest:req error:&error];
	[req release];
	return cnt;
}