The 24/21 13/9 Backgammon Opening
There are a lot of options for the four-three opening roll in backgammon. An interesting part about this backgammon opening roll is that there isn't a consensus among backgammon players regarding which play is the best one. There is no clear favorite among the candidate opening plays. Each play will have advantages and disadvantages. The same will be true for the 24/21 13/9 opening play in backgammon.
The 24/21 13/9 play for this opening roll is another balanced method when considering the possibilities available. We say it is a balanced approach to this opening roll in that the 24/21 13/9 play develops both sides of the backgammon board. The unique thing about this backgammon play is that you give preference to your builder from the bar-point.
Doing 24/21 13/9 also opens up two options for you after the opening roll. You can either strengthen your position on your opponent's side of the backgammon board or build your own home board in your next turn. This is pretty much the natural method of split and build plays. In this case, the 24/21 13/9 opening play is no exception.
By playing 24/21 13/9 in the opening roll, you use the three to split your back checkers. The position of this checker on the backgammon board is comparatively safer. The 20-point is indeed a riskier position, but offers better coverage and is more strategic. When you make the 21-point on the backgammon board you are avoiding a bit of trouble, but remember that the 21-point is also an important point. That alone would also invite some trouble along the way in a backgammon game.
Other than being a bit safer, positioning your checker on the 21-point can give you a good come back if your blot gets hit. Even if your opponent does get a chance to make the 21-point after hitting your backgammon checker you still have an ample chance to anchor on the 20-point (a better position on the backgammon board). And if ever your opponent fails to make the 21-point after hitting, you can always hit back.
If ever your opponent doesn't make the 21-point you can enter either by a four or a five on the dice. If you enter on the 20-point (getting a five on the dice to enter) you present your opponent a tough choice. Your opponent either should cover the blot on the 21-point or hit your checker on the 20-point. If your opponent hits, there'll now be two blots that you can hit when you enter (both enemy blots are key positions).
The backgammon checker on the nine-point is an excellent piece you can use to build home board points. This works pretty well with the backgammon checkers on the six- and eight-points.
The 24/21 13/9 backgammon split play presents you wonderful opportunities either to build your home board or to make an advanced anchor.