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Topic started by condor on 21 Jan 2009, 20:29:41
condor
Elite Member
United States Minor Outlying Islands
Posts: 16
Reply
21 Jan 2009, 20:29:41
 
en Passant in 960? or is this a glitch
I have an active corr960 game:
 
Game ID: NFR1232051051006033013704
 
I tried to execute en Passant and it let me move my pawn diagonal but did not capture the other pawn. In the move history it shows that my pawn took a piece, but lists it on the wrong square. If 960 recognizes passar bataglie, then I don't think it would allow me to move my pawn diagonal, and I don't think it would show a captured piece in the move history.
 
I haven't made the move yet because I don't want to give my opponet a free pawn, and I would not make the move if the pawn were not captured. Has anyone seen this glitch before? I sent admin a notice but they haven't responded yet.
 
Also, I may not fully understand the rules of en passant. The pawn that I am trying to execute with has already captured on piece through normal attack, but it is in position to claim en passant. If it were not eligible then why will it let me move diagonally and document a capture? Wierd.
 
condor
 

[Event "Challenge"]
[Site "Caissa's Web"]
[Date "2009.01.15"]
[White "condor"]
[Black "eatitson"]
[WhiteELO "1745"]
[BlackELO "1350"]
[Variant "Chess960"]
[SetUp "1"]
[FEN "rknqrbbn/pppppppp/8/8/8/8/PPPPPPPP/RKNQRBBN w KQkq - 0 1"]
 
1. d4 d5 2. e4 e6 3. e5 Nb6 4. Nd3 Ng6 5. g3 c6 6. f4 Qc8 7. Nhf2 a5 8. Nc5 Bxc5
9. dxc5 Nd7 10. Nd3 f6 11. Qd2 fxe5 12. fxe5 Rf8 13. Bg2 Rf5 14. Bh3 Rh5 15. Bg4
Rh6 16. Be3 b5

AdminBrian
Administrator
Posts: 514
Reply
21 Jan 2009, 22:43:10
In reply to condor
Re: en Passant in 960? or is this a glitch
In your current position, it is legal to capture en passant by moving the pawn on c5 to b6. The move will appear in the move list as cxb6, which might be confusing since the pawn being captured is on b5. But this is the standard algebraic notation for such captures, so that all moves show the final destination square of the moving piece.
 
The opponent's pawn will not disappear from the board until after you complete the move. This is perhaps confusing as well. We'll look into either removing it or marking it in some way to make it more clear that it will be captured as part of the completed move.
condor
Elite Member
United States Minor Outlying Islands
Posts: 16
Reply
22 Jan 2009, 15:11:07
In reply to AdminBrian
Re: en Passant in 960? or is this a glitch
Thank you Brian, I will go ahead and make the move. It is a rare move, but according to my memory, doesn't the piece usually disappear right away?
AdminBrian
Administrator
Posts: 514
Reply
23 Jan 2009, 09:31:07
In reply to condor
Re: en Passant in 960? or is this a glitch
On the old interface which refreshed the entire screen on each click, the opposing pawn would disappear when the screen was re-drawn to show your pawn on its destination square. The new interface makes things much faster by only moving the piece graphic instead of refreshing the whole board. Since en passant is a fairly rare move, I think it was never really noticed that in this case it now causes some confusion. We need some extra code to specifically clear the opposing pawn, since it is the only time a piece is ever captured without being "landed" on. I don't think it should be very complicated to modify, now that we realize it needs improvement. I think it's safe to say it will work like it used to, by the next time you have the opportunity to use it!