Firstly, i remember that lv da xia's time is running out towards the middle-end of the game. Maybe that can explain the negligence of that obvious one fatal move at the end.

As for the other moves from the start, i am thinking maybe he has been very busy these days so that he did not even have time to think about chess. Therefore the time taken to think for his moves are quite long. Or maybe from the other hand maybe there are also not much motivation for him to win this game like its a national competition which can be resulting from personal reasons too.

Putting that aside, Haiyu...just my opinion..i do also believe that both sides did not play their best. *No offence to the players as i give my two cents worth*. For example, at the opening, black is opening like he is red + he is against red's dan ti ma (which i think loses speed especially when he used the exact few starting moves like he is red?). And at move 4, red's r1+1 may be abit of redundant too. At move 5 when red p3+1, maybe black can consider c8.5 to disrupt the coordination of red's formation first then followed by r2+5. Otherwise i feel that for the actual battle, the remaining black's attack has made red's pieces open up while his own pieces have abit of problem coming out to fight. What do you think, Haiyu?

just my opinion, no offence :)