I can tell you what has been already discussed about stamina, anyway I'd like me too to read some BBs answers.
If your player starts to play with 100% of efficency, he can close the game with the 50% of efficency if stamina is low, it means that if you've a player prominent in stamina he can play all the game better than the same player with lower stamina. Of course the last quarter is the most important for that skill cause your players are more tired.
Don't care about the % written, it was just for example, which is excatly the % is unknow.
1990-2022 Stalinorgel - https://www.youtube.com/watch?v=pV-Xppl6h8Et