Author: Chessfun
Date: 12:31:24 09/26/02
Go up one level in this thread
On September 26, 2002 at 15:27:05, Eduard Nemeth wrote: >Hello Sarah, > >Fritz 7002 have an 0-0-0 BUG: Yes I know. >(with opening books you can this not seen): > >Here my Article: > >Bug in the Fritz 7.002 engine Read the article previously, the whole thing and enjoyed it. >My little middle game test got feedback from a couple of testers. In >one game the following position arose after move 13 (see diagram): > >Gandalf_432h - Fritz 7.002 > >1.e4 c5 2.g3 d5 3.exd5 Dxd5 4.Df3 Dxf3 5.Sxf3 Lf5 6.Lg2 Sc6 7.d3 g6 8.Le3 Lg7 >9.Sc3 c4 10.Sh4 Le6 11.d4 Sxd4 12.Lxb7 Tb8 13.Le4 > >1r2k1nr/p3ppbp/4b1p1/8/2pnB2N/2N1B1P1/PPP2P1P/R3K2R b KQk - 0 13 > >13. ... Txb2? 14.0-0-0 Se2+ 15.Sxe2 Ld7 16.Ld5 Txa2 17.Lxc4 Ta5 18.Sf3 Lc6 >19.Sed4 Lxd4 20.Lxd4 f6 21.Le2 e5 22.Lc3 Td5 23.Txd5 Lxd5 24.Td1 Se7 25.Lb4 Le6 >26.Lc5 Kf7 27.Td6 Tc8 28.Lxa7 Sc6 29.Lc5 Se7 30.Lb4 Sd5 31.La5 Sc3 32.Lxc3 Txc3 >33.Ld3 Ke7 34.Ta6 Tc7 35.Le4 Tc4 36.Ta7+ Kd6 37.Ld3 Tc7 38.Txc7 Kxc7 39.Kb2 Kd6 >40.Kc3 Kc5 41.Sd2 f5 42.Sb3+ Kd6 43.Kb4 h6 44.c4 Kc7 45.Lc2 Lc8 46.Kc5 Le6 >47.Sd2 g5 48.Sf3 e4 49.Sd4 Lc8 50.Kd5 g4 51.Ke5 h5 52.Sxf5 Lb7 53.Lxe4 La6 >54.Se3 Kd7 55.Lg6 1-0 > >After Fritz 7.002 played 13...Rxb2, Gandalf 4.32h simply won the >exchange by queenside castling! > >People tried to guess the reason. In the meantime we know a bit more >about it. In most cases where queenside castling is possible, Fritz >7.002 considers one move less than all the possible ones. I could >produce numerous examples. Using the multiple variation mode it can be >proven easily; here is a simple example: > >8/8/8/8/2p5/2pkp1N1/8/R3K2R w KQ - 0 1 >White to move and mate in 1! > >And here the multiple variation analysis (!) by Fritz 7.002: > >1. +- (#6): 1.Td1+ >2. +- (#9): 1.Se2 >3. +- (#10): 1.Th4 >4. +- (#12): 1.Ta8 >5. +- (#14): 1.Th6 >6. +- (#11): 1.Th8 >7. +- (#11): 1.Th7 >8. +- (#12): 1.Th5 >9. +- (#12): 1.Ta7 >10. +- (#13): 1.Ta3 >11. +- (15.57): 1.Ta5 >12. +- (13.44): 1.Th3 >13. +- (13.41): 1.Tc1 >14. +- (13.41): 1.Th2 >15. +- (13.35): 1.Tb1 >16. +- (13.19): 1.Tf1 >17. +- (13.19): 1.Tg1 >18. +- (13.19): 1.Ta4 >19. +- (13.13): 1.Sf1 >20. +- (13.07): 1.Ta2 >21. +- (13.07): 1.Ta6 >22. +- (12.79): 1.Kd1 >23. +- (12.60): 1.Kf1 >24. +- (12.54): 1.Sf5 >25. +- (12.47): 1.Sh5 >26. +- (11.00): 1.0-0 >27. +- (10.04): 1.Se4 > >Fritz 7.002 recognizes only 27 possible moves... however there are 28, >and the best move (O-O-O#) is missing. What now? > >Hence, there had to be a new update, as such a bug couldn't be left >in. For a serious tournament player such an engine has only a limited >use, since queenside castling occurs in a lot of games. > >The next Fritz 7 update I remeber as follows: On 01/07/02 I was online >at the F7 server Schach.de for a couple of hours, when suddenly a new >update was announces. After the setup I immediately looked into the >folder ChessBase\Engines, where I found a new engine dated >01/07/02. The version number was 7.006! > >At this point I would like to list all Fritz 7 engines published so >far, in order to not lose track in what follows. > >Fritz 7.001 = Datum 13.10.01 (420 kB) >Fritz 7.002 = Datum 05.11.01 (424 kB) >Fritz 7.006 Beta = Datum 07.01.02 (424 kB) >Fritz 7.006 = Datum 11.01.02 (424 kB) >Fritz 7.007 = Datum 23.03.02 (424 kB) > >As somebody related to the message board, the version released on >01/07/02 was a 7.006 beta version that went into the update by >mistake. The update was available on the Fritz 7 server only for a >couple of hours, hence not everybody has this new engine. A couple of >days later there was a new update with the final version of the Fritz >7.006 engine - date: 01/11/02. > >Why a BUG-Engine in a Ratinglist? Because at the time Fritz 7 002 came out the bug was unknown and since it led I saw no reason to remove it. Besides which have you analyzed all positions with 008 and 002 or run a testsuite to confirm that they would play the same move in all positions?. Because an engine has a bug don't mean it can't play and most games are played with opening books. Sarah. >Eduard
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