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Subject: Re: Nobody's perfect: Ruffian accepts illegal move!

Author: Uri Blass

Date: 01:44:37 11/18/02

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On November 18, 2002 at 04:02:36, Severi Salminen wrote:

>>What GUI were you using while playing this game? As far as I know the
>>recognination of illegal moves is done inside the GUI.
>
>I think it can be disabled at least in WinBoard.

Yes but an engine should not accept an illegal move in the first place.

Movei always generates a list of the legal moves and accept a move of the
opponent only if a move is in the list.

Ruffian only accept illegal move with the knights and the pawns but it is enough
to win against it in 2 moves.


[Event "Computer chess game"]
[Site "URI-PC"]
[Date "2002.11.18"]
[Round "-"]
[White "Administrator"]
[Black "Ruffian 1.0.1"]
[Result "1-0"]
[TimeControl "60"]

1. d2xh8=Q Nf6 2. Ng1xg7#
{White mates} 1-0

[Event "Computer chess game"]
[Site "URI-PC"]
[Date "2002.11.18"]
[Round "-"]
[White "Administrator"]
[Black "Ruffian 1.0.1"]
[Result "1-0"]
[TimeControl "60"]

1. Ng1e5 d5 2. f2xf7#
{White mates} 1-0



Uri



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