unable to play my move

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unable to play my move!

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Aniruddha Duttagupta    (2018-04-07)
unable to play my move!

In game 102995 I can't play my move as Black.Any move played by me is shown as INVALID MOVE by the server!What to do???

Aniruddha Duttagupta    (2018-04-07 12:07:17)
unable to play my move!

Now I have observed that there are mismatch in the moves played in the game and recorded in the server.Will Mr Thibault kindly look into the matter urgently so that I can move in the game??

Ilmars Cirulis    (2018-04-07 16:40:39)
unable to play my move!

<< Incorrect move : 7. ...Ng1, from player black. >>

Aniruddha Duttagupta    (2018-04-07 17:15:38)
unable to play my move!

But the game actually continued 7...0-0 8.Nge2 Rb8 9.bxc5 dxc5 10.0-0 b6 11.f4 the server allowed all these moves but now not permitting Black playing his 11th move.What is the solution?

Thibault de Vassal    (2018-04-07 20:01:26)
unable to play my move!

Hello Aniruddha, well that's the first time I see that strange bug. I don't understand yet how it happened but you probably entered it (meaning Ng4 I guess) in the text field rather than clicking the pieces.

I'll investigate to avoid this in the future. Meanwhile & unfortunately, according to the rules, this game must be declared as a win for your opponent. Very sorry about that.

Ilmars Cirulis    (2018-04-07 20:27:44)
unable to play my move!

A bit wtf about rules. :O

Ilmars Cirulis    (2018-04-07 20:29:08)
unable to play my move!

Maybe refunding rating points?

Like "you lost to software bug, so there's your compensation".

Thibault de Vassal    (2018-04-07 20:51:10)
unable to play my move!

That could seem to be a fair solution at a first sight, but of course that would create ways to "save" lost games (and/or complexify rules quite a lot).

This kind of cases is well specified in the rules, it is also up to the players to check their moves to avoid such situations (that could be much more complicate according to the situation).

Aniruddha Duttagupta    (2018-04-07 20:53:38)
unable to play my move!

Dear Mr Thibault,
First time this thing happened to me.I will be careful but kindly see non occurance of this type of software bug further.I lost some rating points unnecesarily in a game which was equal.Definitely it hurts!

Thibault de Vassal    (2018-04-07 21:01:35)
unable to play my move!

I understand but the way I coded the moves verification more than a decade ago, it is unlikely that all cases can be fixed :/ Fortunately, problems are rare now, but I recommend to click the pieces rather than using the text field to avoid it.

Ilmars Cirulis    (2018-04-07 21:47:11)
unable to play my move!

<< That could seem to be a fair solution at a first sight, but of course that would create ways to "save" lost games (and/or complexify rules quite a lot). >>

Even better, you get testers for free. :P

Thibault de Vassal    (2018-04-09 03:44:13)
unable to play my move!

Hello again Aniruddha,

While talking with another player about this strange case, an important question raised: what was the 7th move you intended to play? 7. ... Ng4 as I suggested, 7. ...O-O as the game showed, or another one?

And just to be sure, how did you make the move? What did you type if you used the text field? (or did you click the pieces?) Many thanks for your answers.

Aniruddha Duttagupta    (2018-04-09 16:36:15)
unable to play my move!

Dear Mr Thibault, I am sure I played 7...0-0 as the game showed.Ng4 was my intended move after White played 11.f4.But my move was not permitted by the server.I am sure I used the text field.But now I click the pieces as I play my moves on my mobile.I wonder if my 7th move was wrong how the game continued upto 11th move of White!

Thibault de Vassal    (2018-04-09 17:30:02)
unable to play my move!

So, for your 7th move you typed "0-0" or "7...0-0" ? (with zero-zero, not O-O) Sorry, I have to be absolutely sure to be able to reproduce exactly what happened.

Thank you again.

Aniruddha Duttagupta    (2018-04-09 19:47:59)
unable to play my move!

I feel I had written e8-g8 for the move.
I had never typed 0-0 for kingside castling.

Thibault de Vassal    (2018-04-14 01:14:32)
unable to play my move!

Finally, after some investigation & tests I was able to reproduce the situation & find what most probably happened...

I think that the move you entered was e1-g1 (instead of e8-g8), this is the only one that was able to produce Ng1.

The bug is now fixed, it will not happen again but unfortunately, the rules prevail in this situation as the move was illegal.

My apologies anyway for this unexpected bug.

My best wishes,





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