Late in Yahtzee, the remaining empty boxes determine the value of each die. Before a final reroll, compare the score you can bank now with the chance of improving a specific open category. Check whether a modest upper-section entry protects a larger bonus opportunity or whether a difficult lower-section box must be sacrificed. Do not treat a dramatic roll as automatically better than a reliable score. The endgame decision depends on your actual scorecard and remaining rolls, not a universal 'always hold this pair' rule.