Author: Uri Blass
Date: 15:01:41 02/02/06
Go up one level in this thread
On February 02, 2006 at 17:52:20, Uri Blass wrote: >On February 02, 2006 at 17:44:30, Uri Blass wrote: > >>On February 02, 2006 at 16:07:20, George Tsavdaris wrote: >> >>> I noticed a strange behaviour and definitely a bad one from latest Rybka, and >>>for Winfinder so that means it should be a general bad behaviour of Rybka >>>family:-) Possible bug that prevents correct analysis..... >>> >>> This behaviour is noticed at Fritz 8 GUI(i haven't tried Arena yet). It is also >>>happening at Deep Fritz 8 GUI. It must be a hashproblem or something..... >>> Conditions(I'll describe the procedure i followed--Keep in mind that the values >>>for the seconds i've made analysing between the moves should not play any role >>>at all and different values would produce the problem again): >>> >>>Set the following game: >>> >>>[Event "??"] >>>[Site ""] >>>[Date "2005.01.03"] >>>[Round "?"] >>>[White "Tsavdaris"] >>>[Black "????"] >>>[Result "1-0"] >>>[PlyCount "54"] >>>[EventDate "2005.??.??"] >>> >>>1. e4 e5 2. f4 d5 3. exd5 exf4 4. Nf3 Nf6 5. c4 c6 6. Nc3 cxd5 7. d4 Bb4 8. Be2 >>>Ne4 9. O-O Bxc3 10. bxc3 Nxc3 11. Qc2 Nxe2+ 12. Qxe2+ Be6 13. Ba3 dxc4 14. d5 >>>Qxd5 15. Rad1 Qb5 16. Nd4 Qb6 17. Kh1 Nd7 18. Rxf4 O-O-O 19. Nxe6 Qxe6 20. >>>Rxc4+ Kb8 21. Qxe6 fxe6 22. Rcd4 b5 23. Rxd7 Rxd7 24. Rxd7 Rc8 25. Bd6+ Ka8 26. >>>Bc7 a6 27. Rxg7 Rf8 1-0 >>> >>>-Set Rybka as an engine, clear hashtables and set it to let's say 256 MB. >>>-Go to move 14 for black and start analysis with Rybka(multivariation with 4 >>>lines i had) for some seconds(4-5). >>>-It displays the move Rad1 as best. Press the "Right Key" button from the >>>keyboard in order the next move to be executed while the analysis will continue. >>>-Press the "Right Key" button again after 1-2 seconds so the move Qb5 will be >>>played. >>>-Press the "Right Key" button again after 4-5 seconds so the move Nd4 will be >>>played. >>>-Press the "Right Key" button again after 1-2 seconds. >>>Now Rybka displays 17.Rxf4 as the best move with -2.00 evaluation! >>>So what? Well if we clear at that point the hashtables then Rybka displays the >>>correct evaluation and correct move which is 17.Kh1 with a positive score. >>> >>> Also if we put the position with white at move 17 to play, to Rybka to analyse >>>then we get the correct analysis. But if we have the analysis open from move 15 >>>and continue up to move 17 for white we get 17.Rxf4???? >>> >>> >>>Can anyone reproduce this.....? >> >>I could reproduce it in 3 option mode >> >>Here is the pv at depth 14 >> >>Tsavdaris, 2005 >>rn2k2r/pp3ppp/1q2b3/8/2pN1p2/B7/P3Q1PP/3R1RK1 w kq - 0 1 >> >>Analysis by Rybka 1.01 Beta 13b 32-bit: >> >>1. -+ (-2.38): 17.Rxf4 >>2. -+ (-2.38): 17.Kh1 >>3. -+ (-2.53): 17.Bb2 >> >>(, 03.02.2006) >> >>depth 15: >> >>Tsavdaris, 2005 >>rn2k2r/pp3ppp/1q2b3/8/2pN1p2/B7/P3Q1PP/3R1RK1 w kq - 0 1 >> >>Analysis by Rybka 1.01 Beta 13b 32-bit: >> >>1. -+ (-2.44): 17.Rxf4 >>2. -+ (-2.44): 17.Kh1 >>3. -+ (-2.59): 17.Bb2 >> >>(, 03.02.2006) >> >>one of the strenge things is that there is no pv for none of the lines >> >>Uri > >A simpler way to reproduce it is to start from the position after 15.Rad1 and >make the game moves 15...Qa5 16.Nd4 Qb6 fast. > >I get the following analysis at depth 14: > >Tsavdaris, 2005 >rn2k2r/pp3ppp/1q2b3/8/2pN1p2/B7/P3Q1PP/3R1RK1 w kq - 0 1 > >Analysis by Rybka 1.01 Beta 13b 32-bit: > >1. -+ (-2.44): 17.Bb2 >2. -+ (-2.45): 17.Rxf4 >3. -+ (-2.45): 17.Kh1 > >(, 03.02.2006) > > > > >Uri I tried to reproduce it under shredder gui Here is what I get As you can see Rybka cannot see Kh1 with a positive score in a reasonable time. I gave up at depth 16 CPU0: AuthenticAMD x86 Family 15 Model 4 Stepping 8 2009 MHz GUI: Tablebases with 5 pieces found! [Cache: 16 MB + internal 13.67 MB] Engine: Rybka 1.01 Beta 13b 32-bit (256 MB) by Vasik Rajlich best move: Qd5-b5 time: 0:00.234 minnodes: 72 ----- 8 0:00 +1.42 15...Qa5 16.Nd4 Qb6 17.Rxf4 O-O-O (37.932) 45 8 0:01 +0.47 15...Qb5 16.Ne5 Nc6 17.Nxf7 Kxf7 18.Rxf4+ Bf5 (64.828) 43 7 0:00 0.00 15...Qf5 16.Qb2 Nd7 17.Rxd7 (26.202) 42 ----- 8 0:00 +1.42 15...Qa5 16.Nd4 Qb6 17.Rxf4 O-O-O (37.932) 45 8 0:01 +0.47 15...Qb5 16.Ne5 Nc6 17.Nxf7 Kxf7 18.Rxf4+ Bf5 (64.828) 43 8 0:01 -1.63 15...Qf5 16.Qb2 Nd7 17.Rxd7 Bxd7 18.Qxb7 (73.424) 44 ----- 8 0:00 +1.42 15...Qa5 16.Nd4 Qb6 17.Rxf4 O-O-O (37.932) 45 8 0:01 +0.47 15...Qb5 16.Ne5 Nc6 17.Nxf7 Kxf7 18.Rxf4+ Bf5 (64.828) 43 8 0:01 -0.64 15...Qc6 16.Rd6 Qc8 17.Ng5 O-O (79.820) 43 best move: Qd5-a5 time: 0:01.875 min n/s: 44.717 nodes: 81.924 ----- 8 0:01 -0.32 16.Ne5 Nc6 17.Nxf7 Kxf7 18.Rxf4+ Bf5 19.Rd7+ Kg8 (68.426) 53 8 0:02 -1.16 16.Qd2 Qb6+ 17.Rf2 Nd7 18.Qxf4 O-O-O (105.017) 53 8 0:01 -1.64 16.Nd4 Qb6 17.Rxf4 O-O-O 18.Kh1 (73.063) 51 best move: Nf3-e5 time: 0:02.422 min n/s: 52.279 nodes: 122.887 ----- 9 0:01 +1.71 16...Qb6 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 (78.673) 47 8 0:01 -4.40 16...Qa6 17.Nxe6 fxe6 18.Rd6 Qxd6 19.Bxd6 Kd7 (53.269) 46 8 0:01 -4.56 16...Qd5 17.Nxe6 Qxe6 18.Rfe1 Nc6 19.Qh5 (54.604) 46 best move: Qb5-b6 time: 0:01.782 min n/s: 47.051 nodes: 81.927 ----- 9 0:01 -2.10 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Re4 Qa6 (62.284) 52 9 0:01 -2.10 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Re4 Qa6 (72.312) 54 9 0:01 -2.39 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rhe8 (97.020) 53 ----- 10 0:03 -2.05 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Re4 (164.900) 52 9 0:01 -2.10 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Re4 Qa6 (72.312) 54 9 0:01 -2.39 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rhe8 (97.020) 53 ----- 10 0:03 -2.05 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Re4 (164.900) 52 10 0:03 -2.05 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Re4 (183.013) 53 9 0:01 -2.39 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rhe8 (97.020) 53 ----- 10 0:03 -2.05 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Re4 (164.900) 52 10 0:03 -2.05 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Re4 (183.013) 53 10 0:04 -2.54 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rd5 20.Qd2 (220.827) 53 ----- 11 0:07 -2.09 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (368.606) 52 10 0:03 -2.05 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Re4 (183.013) 53 10 0:04 -2.54 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rd5 20.Qd2 (220.827) 53 ----- 11 0:07 -2.09 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (368.606) 52 11 0:07 -2.09 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (406.871) 53 10 0:04 -2.54 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kh1 Rd5 20.Qd2 (220.827) 53 ----- 11 0:07 -2.09 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (368.606) 52 11 0:07 -2.09 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (406.871) 53 11 0:09 -2.49 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kf1 Rhe8 20.Bc3 Nxd4 (495.440) 54 ----- 12 0:19 -2.40 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (984.848) 52 11 0:07 -2.09 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qc2 g5 20.Rb1 Qa6 (406.871) 53 11 0:09 -2.49 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kf1 Rhe8 20.Bc3 Nxd4 (495.440) 54 ----- 12 0:19 -2.40 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (984.848) 52 12 0:20 -2.40 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (1.073.358) 52 11 0:09 -2.49 17.Bb2 O-O-O 18.Rxf4 Nc6 19.Kf1 Rhe8 20.Bc3 Nxd4 (495.440) 54 ----- 12 0:19 -2.40 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (984.848) 52 12 0:20 -2.40 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (1.073.358) 52 12 0:25 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 (1.354.419) 54 ----- 13 0:39 -2.42 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.042.860) 52 12 0:20 -2.40 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h4 Qa5 20.Qb2 Na6 21.Kh2 (1.073.358) 52 12 0:25 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 (1.354.419) 54 ----- 13 0:39 -2.42 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.042.860) 52 13 0:41 -2.42 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.182.164) 53 12 0:25 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 (1.354.419) 54 ----- 13 0:39 -2.42 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.042.860) 52 13 0:41 -2.42 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.182.164) 53 13 0:45 -2.53 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 22.Qc5+ Kb8 (2.472.325) 55 ----- 14 1:13 -2.45 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (3.777.025) 52 13 0:41 -2.42 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.h3 g5 20.Re4 Nc6 21.Nxe6 Rxd1+ 22.Qxd1 Rxe6 (2.182.164) 53 13 0:45 -2.53 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 22.Qc5+ Kb8 (2.472.325) 55 ----- 14 1:13 -2.45 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (3.777.025) 52 14 1:17 -2.45 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (4.050.143) 53 13 0:45 -2.53 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Nxd4 20.Bxd4 Qd6 21.Bxg7 Qxd1 22.Qc5+ Kb8 (2.472.325) 55 ----- 14 1:13 -2.45 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (3.777.025) 52 14 1:17 -2.45 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (4.050.143) 53 14 1:29 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Rxd4 20.Bxd4 Nxd4 21.Rxd4 g5 22.Rfd1 h5 23.g3 Rg8 (4.817.805) 55 ----- 15 2:07 -2.53 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (6.986.426) 56 14 1:17 -2.45 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 (4.050.143) 53 14 1:29 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Rxd4 20.Bxd4 Nxd4 21.Rxd4 g5 22.Rfd1 h5 23.g3 Rg8 (4.817.805) 55 ----- 15 2:07 -2.53 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (6.986.426) 56 15 2:19 -2.53 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (7.780.652) 57 14 1:29 -2.47 17.Bb2 O-O-O 18.Bc3 Nc6 19.Qf2 Rxd4 20.Bxd4 Nxd4 21.Rxd4 g5 22.Rfd1 h5 23.g3 Rg8 (4.817.805) 55 ----- 15 2:07 -2.53 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (6.986.426) 56 15 2:19 -2.53 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (7.780.652) 57 15 3:04 -2.58 17.Bb2 O-O-O 18.Kh1 Rhe8 19.Bc3 Qc7 20.Nxe6 Rxd1 21.Rxd1 Rxe6 22.Qh5 g6 23.Qxh7 (10.449.420) 58 ----- 16 4:41 -2.53 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 23.Rf6 (16.003.574) 58 15 2:19 -2.53 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 (7.780.652) 57 15 3:04 -2.58 17.Bb2 O-O-O 18.Kh1 Rhe8 19.Bc3 Qc7 20.Nxe6 Rxd1 21.Rxd1 Rxe6 22.Qh5 g6 23.Qxh7 (10.449.420) 58 ----- 16 4:41 -2.53 17.Rxf4 O-O-O 18.Kh1 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 23.Rf6 (16.003.574) 58 16 4:55 -2.53 17.Kh1 O-O-O 18.Rxf4 Rhe8 19.Qf1 Qa6 20.Bb2 Bd5 21.Rf2 g6 22.a3 Nc6 23.Rf6 (16.984.246) 58 15 3:04 -2.58 17.Bb2 O-O-O 18.Kh1 Rhe8 19.Bc3 Qc7 20.Nxe6 Rxd1 21.Rxd1 Rxe6 22.Qh5 g6 23.Qxh7 (10.449.420) 58
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