A shot that is six or few points away.
When a checker can be hit by a number on a single die (1-6). A direct shot will be hit more frequently than an indirect one.
A checker that can be hit by your opponent with a roll of 6 or less.
When a number that needed to hit a checker is 1-6, it is more likely to get it on a single die and direct shot than from indirect shot. – combination of the dice.
The opportunity to hit one's opponent's blot with the roll of but one die.