Can entire prosecution case be based on whatsapp chat only, 420 case

Hi. I have a whatsapp chat in a group where some people were talking about cheating and promised money was transferred between the two people but I don't exactly know if they really cheated or not. Can I win a case against them only on the basis of whatsapp chat without any other evidence and actually, even I am not sure if cheating happened or not, but as they have shared money, it must have happened. Do I have any chance in this case? I have nothing except whatsapp chat. The case is related to cheating in an event where some award was to be given. I want to file the case because someone close to me could not win and the winner might have won by impersonation cheating but I have only whatsapp chat.