[Chess] Simplify legal_underpromotions (#1236)
#4030
| Job | Run time |
|---|---|
| 10m 36s | |
| 13m 27s | |
| 24m 3s |
legal_underpromotions (#1236)
#4030
| Job | Run time |
|---|---|
| 10m 36s | |
| 13m 27s | |
| 24m 3s |