There are two good ways to take out 41.

1 — D20 = 41

9 — D16 = 41

I recommend going 9 — D16. For the most part, you want to leave 32 as often as possible. This is because you never end up on an odd score during the whole progression. Meaning if you miss inside the double on 32 you will leave 16, then 8, then 4, then 2.

Going 1 — D20 is also acceptable, you just run the risk of wasting a dart later on. If you miss inside the D20 you will leave 20, then 10, then 5. Once you get to 5 you have to waste a dart to get your score back to even. That’s why going 9 — D16 is slightly better percentage wise.

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You will see that most of the time you are going to end up on D16 or D20 for most outs. There are a few exceptions where the math doesn’t work, or the layout of the board can give you a higher % shot. But for the most part these are going to be your most used doubles. Here’s why:

D16: Clean progression, never have to waste a dart on an odd number.
D20: Worth the most points while still being a full size double. Sometimes you will not be able to get to D16 as easy as you can get to D20. A good example is the scores 53-60. You can hit a big single to get to D20, while getting to D16 from that range is a lot more complicated and less % chance to hit.