Private replies to public questions.

Would it be ok to ask a player a question in the game chat but request the reply as a PM. In my scenerio a player could have realitively easily finished the game but instead has let it progress to the point where he has no advantage.
Now, as I see it, either he is purposefully trying to make it a longer game which increases his chances of losing(seems unlikely) or he just never saw that he had a donimant advantage.
My question would be: (color)You had what seemed to me, to be a easily won game in the early rounds. Why didn't you use it and finish the game?(just wondering)reply as PM
I would gain no advantage from the question except some insight into the reasoning for not making the moves.
Your thoughts on this topic are appreciated. Thanks Players
Now, as I see it, either he is purposefully trying to make it a longer game which increases his chances of losing(seems unlikely) or he just never saw that he had a donimant advantage.
My question would be: (color)You had what seemed to me, to be a easily won game in the early rounds. Why didn't you use it and finish the game?(just wondering)reply as PM
I would gain no advantage from the question except some insight into the reasoning for not making the moves.
Your thoughts on this topic are appreciated. Thanks Players