Checking out 121

The standard route

T20 T7 D20

After the first dart

leaves 61 — T7 D20

After the second dart: leaves 40 — D20

If the first dart misses

• T20 T15 D8
• T20 T19 D2
• T20 T17 D5

With two darts

There is no two-dart finish from here.