stalling
I do not think it is stalling. It is a three day game, she or he can take all the time they need. If you do not want to wait for 2+ days, play dailies with shorter time control.
Edit: if the combination is obvious, you can also use conditional moves.
In my personal opinion it’s too much like cheating ;) (yes, it is stalling, destroying tempo, allowing players to go and punch things into chess computers to get solutions etc etc) so I no longer take part in any of them.
If there were 10 minute game tourneys it would be excellent!
Just my thoughts. I’m not trying to start an argument!