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Stuck move bug.

This happened to me couple of time, so I'm certain it's a bug.

Lag on my side, I'm getting that canceled move bug, that happens when it lags sometime. I premove, but game will cancel it, not a big problem normally, but in rare cases, game will sometime not allow me to make the same move again. It appears as in the cases when it's an invalid move. Like opening a check, for example.
Can you give the link to the game and tell me where the bugs are, I am very interested in your case, it sounds peculiar and weird.
You won't see much in a replay. I'd need to get a video to really show it, but it happened last in this game:

http://en.lichess.org/3rnhTtAa#16

My move 9. I couldn't move my Queen to c2. As you can see from move times, I spent 10 seconds trying to do that.

It was a laggy game as I was loosing seconds on premoves even before that. Ping was high, around 500ms, but it dropped late in the game, and cause of lag was most probably on my side also. I was just downloading something. No point in searching other cases, as I certainly don't remember exactly in which game they were, and they are quite rare, but all happened in laggy games.
Thanks for the details, can you remember if this has happened any time when you did not make a premove?

If it happens again you can reload the page (F5) to fix it.
I managed to replicate it. Started a game, filled my connection with down-traffic, and it happened again.

In this game: http://en.lichess.org/dHhwnf8y#18 on my move 10 I couldn't move my bishop to b2. Why would I by trying to move him there is another story.

You see as it appeared on my board, there was a knight on c3! I guessed it stayed there from one of the premoves previously. I really didn't notice that I had an extra knight as only thing bothering me was trying to get my bishop to b2.

Only when I refreshed the page, board reset and I probably could move my bishop to b2 if I so wanted.

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