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Old March 14th 04, 10:26 AM
Antonio R.
 
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Default SCID (and SCID Daily)

SCID (and SCID Daily)

The author of SCID, chess database software, seems to be an
experienced chess player as well. He set up a new page in SCID
Homepage (in addition to his recent scidbase CD of one million games)
related with chess playing (openings, tactics and endgames). You can
see this at
http://scid.sourceforge.net/daily.php

Regards
Anton
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Old March 14th 04, 04:48 PM
Mikko Nummelin
 
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Default SCID (and SCID Daily)

On Sun, 14 Mar 2004, Antonio R. wrote:

SCID (and SCID Daily)

The author of SCID, chess database software, seems to be an
experienced chess player as well. He set up a new page in SCID
Homepage (in addition to his recent scidbase CD of one million games)
related with chess playing (openings, tactics and endgames). You can
see this at
http://scid.sourceforge.net/daily.php


Their endgame solution is incorrect, which can easily be verified with
SCID itself with tablebases. The position is:

1K6/8/7p/1R5P/6k1/8/6p1/8 w - - 0 1
(White to move and win)

The provided "solution" is

1.Rb7! (1.Rb1? Kxh5 2.Rg1 Kg4 3.Rxg2+ Kf4 4.Rh2 Kg5 =) 1...Kxh5 2.Rg7 Kh4
3.Rxg2 Kh3 4.Rg6 h5 5.Kc7 h4 6.Kd6 Kh2 7.Ke5 h3 8.Kf4 Kh1 9.Kg3 +-

Let's look at the "erroneous" line more carefully:

1.Rb1? Kxh5 2.Rg1 Kg4 3.Rxg2+ Kf4 4.Rh2 Kg5 =

This position is NOT draw, but according to tablebases, it is won by White
with 5. Kc7! (mate in 24), longest variation is 5.Kc7 h5 6.Kd6 Kg4
7.Ke5 h4 8. Rg2+ Kf3 9.Ra2 Kg4 10.Ra4+ Kg3 11.Kf5 h3 12.Ra3+ Kh4
13.Kf4 h2 14.Ra1 Kh3 15.Kf3 Kh4 16.Rf1 Kh3 17.Rh1 {and white wins the
pawn}


Mikko Nummelin
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Old March 14th 04, 07:00 PM
Anders Thulin
 
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Default SCID (and SCID Daily)

Mikko Nummelin wrote:

Their endgame solution is incorrect,


The solution seems to be the one given by the author of the
study in 'Schackbulletinen, 1962'.

--
Anders Thulin ath*algonet.se http://www.algonet.se/~ath
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Old March 14th 04, 10:16 PM
Mikko Nummelin
 
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Default SCID (and SCID Daily)

On Sun, 14 Mar 2004, Anders Thulin wrote:

Mikko Nummelin wrote:


Their endgame solution is incorrect,


The solution seems to be the one given by the author of the
study in 'Schackbulletinen, 1962'.


But it is weird to put it into SCID daily "as is" without checking with
SCID itself, chess engine and tablebases that the solution really is
correct.


Mikko Nummelin
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Old March 14th 04, 11:11 PM
Mikko Nummelin
 
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Default SCID (and SCID Daily)

On Sun, 14 Mar 2004, Mikko Nummelin wrote:

On Sun, 14 Mar 2004, Antonio R. wrote:


SCID (and SCID Daily)


The author of SCID, chess database software, seems to be an
experienced chess player as well. He set up a new page in SCID
Homepage (in addition to his recent scidbase CD of one million games)
related with chess playing (openings, tactics and endgames). You can
see this at
http://scid.sourceforge.net/daily.php


Their endgame solution is incorrect, which can easily be verified with
SCID itself with tablebases. The position is:


1K6/8/7p/1R5P/6k1/8/6p1/8 w - - 0 1
(White to move and win)


The provided "solution" is

1.Rb7! (1.Rb1? Kxh5 2.Rg1 Kg4 3.Rxg2+ Kf4 4.Rh2 Kg5 =) 1...Kxh5 2.Rg7 Kh4
3.Rxg2 Kh3 4.Rg6 h5 5.Kc7 h4 6.Kd6 Kh2 7.Ke5 h3 8.Kf4 Kh1 9.Kg3 +-


Let's look at the "erroneous" line more carefully:

1.Rb1? Kxh5 2.Rg1 Kg4 3.Rxg2+ Kf4 4.Rh2 Kg5 =

This position is NOT draw, but according to tablebases, it is won by White
with 5. Kc7! (mate in 24), longest variation is 5.Kc7 h5 6.Kd6 Kg4
7.Ke5 h4 8. Rg2+ Kf3 9.Ra2 Kg4 10.Ra4+ Kg3 11.Kf5 h3 12.Ra3+ Kh4
13.Kf4 h2 14.Ra1 Kh3 15.Kf3 Kh4 16.Rf1 Kh3 17.Rh1 {and white wins the
pawn}


Worse still, it appears that 1. Rb7 is a mistake which only draws. Black
is not compelled to play 1..Kxh5?, but 1..Kg3! instead, and can save
the game with exact play!!!


Mikko Nummelin
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