Unable to parse coordinate error message not specific enough

[yingx9]

Steps to reproduce:

1. Enter b for black* to choose colour
2. Enter 1 to choose difficulty
3. Enter move a1

Expected:

Error message telling me I am missing the second coordinate

Actual:

Unable to parse coordinate!

Error messages that are not specific enough can be a feature flaw

[nus-pe-bot]

Your response not required for this bug as the team has accepted the bug as it is.