"He did not play well yesterday."
Translation:Včera nehrál dobře.
why cant you start with nehral? e.g.. nehrál včera dobře. nehrál dobře včera.
That is a question word order (quite similar to English in fact).
But it is possible here and natural as an answer:
Proč není dnes na soupisce? Nehrál včera dobře.
Why isn't he on the roster today? He did not play well yesterday.
I will add it.
Yes! finally Im good enough in czech to contest the standardized answers
There are generally many -- sometimes very many -- acceptable answers for each exercise, though only one can be shown at the top of the discussion page. So it usually doesn't hurt to ask about alternatives! :-) It's also a very good idea to use the Report button, if your answer was rejected and you believe it's correct, in addition to asking in the discussions.