A key to winning in Rummy Game 51 is knowing when to declare and when to hold. When declaring "Rummy" and ending the round is advantageous, players must carefully weigh this agarummy dhaninst continuing to build their hand in order to form stronger sets and melds. It's critical to evaluate your hand's strength and consider the advantages and disadvantages of declaring vs holding. Evaluation of Hand Power. Players can improve their decision-making regarding when to declare "Rummy" and raise their chances of winning by honing this skill.