Author: Eduard Nemeth
Date: 12:27:05 09/26/02
Go up one level in this thread
Hello Sarah, Fritz 7002 have an 0-0-0 BUG: (with opening books you can this not seen): Here my Article: Bug in the Fritz 7.002 engine 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? Eduard
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.