#1 Castling rights bug transcribed from the Computer Chess Club

[Dann Corbit]

Subject: winboard feature

Posted by Will Singleton (Profile) on November 16, 2004
at 21:26:01:

I never noticed this before, but winboard apparently
converts a position that
has no king castling rights into a position with castling
rights.

Try this:

Paste position to clipboard:
r1b1k2r/1p4pp/p2ppp2/6B1/4P3/2N2QP1/PqP3BP/5R1K b -
-

now Copy position from clipboard, and you get this:
r1b1k2r/1p4pp/p2ppp2/6B1/4P3/2N2QP1/PqP3BP/5R1K b
kq -

I guess winboard thinks that the black king hasn't
moved. Ok, so how about
pasting the pgn into winboard, then doing Copy position
to clipboard. You would
think that winboard would get it right now, but...

[Event "ICC 45 10"]
[Site "Internet Chess Club"]
[Date "2004.11.16"]
[Round "-"]
[White "Zappa"]
[Black "Amateur"]
[Result "1-0"]
[ICCResult "Black resigns"]
[WhiteElo "2655"]
[BlackElo "2462"]
[Opening "Sicilian: Taimanov (Bastrikov) variation"]
[ECO "B47"]
[NIC "SI.40"]
[Time "19:51:56"]
[TimeControl "2700+10"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Qc7 6.
g3 a6 7. Bg2 Nf6 8.
O-O Be7 9. Re1 Nxd4 10. Qxd4 Bc5 11. Qd1 d6 12. Bg5
Qb6 13. Qf3 Ng4 14. Qxg4
Bxf2+ 15. Kh1 Bxe1 16. Rxe1 Qxb2 17. Qf3 f6 18. Qh5+
Kf8 19. Qf3 Ke8 20. Rf1
Rf8 21. e5 dxe5 22. Qh5+ Kd7 23. Qxh7 Qb4 24. Rd1+
Ke8 25. Ne4 Rf7 26. Nd6+
Qxd6 27. Rxd6 fxg5 28. Qg8+ {Black resigns} 1-0

Paste the game, advance to move 20 (after 19...Ke8),
then copy position to
clipboard. You get:

r1b1k2r/1p4pp/p2ppp2/6B1/4P3/2N2QP1/PqP3BP/4R2K w
kq - 0 20

Not very helpful behavior. If you try pasting the correct
fen into winboard:

r1b1k2r/1p4pp/p2ppp2/6B1/4P3/2N2QP1/PqP3BP/4R2K
w - - 0 20

winboard passes the incorrect fen to the engine. So, in
order to analyze the
above position correctly, you have to paste the pgn in,
go to move 20, then
select analyze. Zappa's move, 20.Rf1, is pretty good
here. In fact, all
Zappa's moves seem to be pretty good these days,
especially when running on his
dual. Tough to beat.

Will