Players with an early lead like to be rewarded for their efforts, but other players don't like to be too far behind.

Many games have a small number (often 3) of rounds, each of which contains a substantial portion of the game play. When a certain condition occurs, the round ends and a set of special events occurs. Usually these events include game scoring. Doing scoring at the end of rounds instead of only at the end of the game breaks up both game play and scoring, to help maintain player interest, and also rewards players for their performance at all stages of the game, not only the end. Doing the scoring in rounds instead of continuously prevents the scoring from interrupting normal game play.

The round ending condition should fit within the game. The examples should illustrate

Therefore, break the game into a small number of significant rounds, to provide some variation to game play and break up scoring.