Checking out 123

The standard route

T20 T13 D12

After the first dart

leaves 63 — T13 D12

After the second dart: leaves 24 — D12

If the first dart misses

• T20 T17 D6
• T20 T19 D3
• T20 T15 D9

With two darts

There is no two-dart finish from here.