Author: Dann Corbit
Date: 12:43:47 01/03/06
Go up one level in this thread
On January 01, 2006 at 13:31:31, Vincent Lejeune wrote:
>On January 01, 2006 at 11:42:20, Joachim Rang wrote:
>
>>On January 01, 2006 at 11:28:40, Mike Byrne wrote:
>>
>>>http://isbn.nu/1579125549
>>>
>>>big book - buy.com has it for $10.98, 38% lower than Amazon
>>>
>>>1120 pages -- it's a big book for an $11 paperback
>>>
>>>http://www.buy.com/prod/Chess/q/loc/106/31303786.html
>>>
>>>although I have the hardcover - I may buy the paperback as my "working copy"
>>>
>>>......
>>
>>hardcopy or paperback does not matter. What I would buy is an electronic version
>>with the 5000 positions collected as FENs.
>>
>>Joachim
>
>
>I found all the positions in PGN format here :
>http://www.qno.de/schach/polgar.zip
>There 4463 mate in 1,2 or 3 moves and some very easy tactic so :
>more than 99% of them are found in less than a second by modern engines: happy
>diging !
>
>Here's one interresting :
>
>[Event "#5215 Chess: 5334 Problems, Combination"]
>[Site "Copyright 1994 Könemann"]
>[Date "1994.??.??"]
>[Round "?"]
>[White "Polgar sisters' tournament-ga"]
>[Black "White to move and win"]
>[Result "*"]
>[SetUp "1"]
>[FEN "2b1k1nr/r5b1/pp1P1pp1/2p3B1/q1P1PQ2/2P3Pp/4B2P/2NR1RK1 w k - 0 1"]
>[PlyCount "15"]
>[EventDate "1994.??.??"]
>
>1. e5 fxg5 2. Qe4 Bf5 3. Rxf5 gxf5 4. Qxf5 Ne7 5. dxe7 Rxe7 6. Qc8+ Kf7 7. Rf1+
>Kg6 8. Bd3+ {+-} *
So far, I have analyzed up through 32,300 so that one is just out of reach as of
yet.
I completed a precursory checkmate search with Chest 3.19 and found 11824
checkmates through depth 5.
I have analyzed with Crafty at 10 seconds per position through 32,300 and a few
thousand with Rybka (but Arena got hung up, does not know how to handle EPD
files with 35000 rows in it).
It seems that there are some mistakes in the file (not all moves are optimal)
but also some clever brilliancies that the programs do not see and yet are
clearly the right moves.
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