2.Making a move A stone is played quickly as near as possible to its intended intersection. Once the stone touches the board, there should be minimal physical movement required to place the stone on its intended intersection, and then it should be released straightaway. Once the stone is played, any removal of the opponent's stones is carried out. A move is completed by pressing the clock with the same hand that played the move. Once the clock is pressed, the hand used must promptly be removed from the clock.

4: Position disturbance If the position is disturbed accidently, or if a position was recorded incorrectly during an adjournment, and the players cannot simply correct it, then the referee can apply the following procedures, in order:
correct the position.
continue with the position as is.
unwind the game to a previous agreed position.
award a loss to the player who disturbed the position.
cancel the game and start afresh with possibly reduced time limits.

In future important on-line games maybe a solution will be to introduce an additional "press the clock" step which will make it more similar with in-person play and should help with these contentious situations.

The mouse-issue was unfortunate. In a way, it's good for Shin Jinseo to lose in the end, because maybe it could help lead to better preparation for these kinds of issues.

We said this a few months ago with Park Junghwan's mouse problems and timeout in the Nongshim cup!

We said this a few months ago with Park Junghwan's mouse problems and timeout in the Nongshim cup!

Just relaying part of the post-match interviews with Shin Jinseo and Ke Jie, on the subject of Game 1 (my personal thoughts in the comments below):

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SHIN JINSEO: I wasn't aware of the (trackpad sensitivity) issue which caused the misclick - I only realized the problem after it happened, which was already too late. I feel that both the Hankuk Kiwon and myself should have foreseen this before the match.

I was shocked at first, but ultimately decided to carry on without lodging any disputes. After all, misclicks are considered as mistakes on the goban.

I really fancied clinching this title, having prepared myself rigorously since the Round of 32 - so I do want to apologize to my fans for the eventual outcome. I am now in a difficult position, but I'll have plenty of other chances for which I'll work hard.

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KE JIE: I became fairly surprised when I saw the misclick. I thought he would ask for a pause or lodge a dispute, so I waited for quite a while before making my next move. I didn't know what was going on, and no one in the room reacted or talked to me, so in the end I decided to continue the game.
Even though that misclick turned out to be a very bad move, the game was far from being a done deal. I played some slack moves afterwards, but eventually I managed to keep applying pressure on him. Since he didn't lodge a dispute, I just carried on and tried my best in the remainder of the game.
I found the misclick itself quite funny, but I would have probably accepted an undo had he asked for it - not a total rematch, but an undo. But this is only hypothetical, since I didn't know how or why the incident occurred. I even turned around to see if there was any word in the room, but since no one approached me, I just carried on with the game.

I really didn't know what's going on...If I got up and said something, what if I got forfeited? So I just kept on playing. It was still very early stages in the game, and his winning chances got up to around 30%, but perhaps he wasn't feeling too well mentally. I just thought that I could not afford to lose that game, especially if my opponent had made a misclick. The pressure on me would be very difficult to overcome.

이미 일어난 일이니까 지금은 어쩔 수 없고 선수나 한국기원이 신경 써야 할 것 같다

It already happened, so there's nothing we can do about it; it's something that players and/or the Hanguk Kiwon will have to pay attention to going forward.

Magnus was still bewildered afterwards when Kaja Snare asked him what had happened with the mouse-slip.

The truth is I don’t really know. Usually I will know it’s one of two things. Either you just try to make the move and then you move it too far or not far enough, or the other one is that you think about making a move and then you drop the piece back on the wrong square, and frankly I don’t even remember which one it was, which is very strange. Regardless of what happens it was kind of sudden. I was choosing between many strong continuations there and all of a sudden I have to resign.

He didn't necessarily have to resign, but when Nepo hesitated Magnus stepped in to avoid any repeat of the kind of magnanimity he’d shown himself when Ding Liren lost on time against him in the Chessable Masters.

Maybe because he was in shock of what happened and I decided that one thing I don’t want to happen is him to think, 'should I offer a draw since he slipped in a winning position?' and so on, so I just resigned so he wouldn’t have to make any of those decisions.

Magnus feels mouse-slips are just part and parcel of the online game.

There are functions that you can choose like confirm move, that you have to confirm every move, but this can take away mouse-slips, but it slows the game down and takes away precious seconds. I think mouse-slips are part of the game, but obviously when it happens that’s really the worst way to lose the game!