Oso wrote:
Now, If I propose to talk about "why people needs undo?", I will discover 80% of cases for "mistakes of players". In my house playing chess we have a rule, "touched piece = you should move this piece"
That's already a rule.
As for "mistakes," so what? I don't play with anyone in person that won't let you take back a move, assuming you didn't expose anything, and that you do it immediately. If I place a worker on the wood, and then immediately pick it up and go "oh, no I want the stone," I don't know anyone who would take issue with that. I even know one lady that'll let you take back a move if you were mistaken about a rule, even if other players have already taken moves, like actually undoing their moves so you can back up, which I think is absolutely ludicrous.
I'm also very visual, so for instance, in Chinagold I like to be able to sit back and visualize what my move is doing - fortunately in that game I can unclick what I did so I get away with it.
I think it makes a difference whether you're taking games pretty seriously, or whether you're just playing casually. Perhaps in tournament play I could see not ever being able to change something, but I'm mostly just not playing quite that seriously to care.