Author: Drexel,Michael
Date: 15:52:43 12/22/05
Go up one level in this thread
On December 22, 2005 at 16:37:25, Dann Corbit wrote: >On December 22, 2005 at 15:23:07, Dann Corbit wrote: > >>On December 22, 2005 at 14:35:56, Drexel,Michael wrote: >> >>>On December 22, 2005 at 13:26:55, Dann Corbit wrote: >>> >>>>On December 21, 2005 at 21:20:10, Uri Blass wrote: >>>> >>>>>On December 21, 2005 at 20:30:18, Dann Corbit wrote: >>>>>> >>>>>>Generally speaking, chess engines have terrible judgement in early opening >>>>>>positions and absurd judgement in gambits. >>>>>> >>>>>>For a bit of gambit fun, try this position on your chess engine: >>>>>> >>>>>>[D]r1bqk1nr/pppp1ppp/2n5/b7/2BpP3/2P2N2/P4PPP/RNBQ1RK1 b kq - am dxc3; bm Nge7; >>>>>> >>>>>>and see how long it takes to find Nge7. Most engines I tried cannot find it in >>>>>>an 8 hour search. I have not tried it lately, but I guess that they still >>>>>>cannot find it at 40/2, no matter what the hardware or program (w/o book, that >>>>>>is). >>>>> >>>>>am dxc3 is easy for rybka >>>> >>>>Not for the others, though. >>>> >>>>>bm Nge7 is an harder problem and Rybka likes Nf6 >>>>>Are you sure that Nge7 is the only move? >>>> >>>>It is clearly the best move. >>> >>>I wonder how you came to that definite conclusion? >>>You are aware of the alternative 7...Bb6 8.cxd4 d6 ? >> >>It appears to have been popular in the 1800's. In my database, I have 512 games >>from that position: >>[D]r1bqk1nr/ppp2ppp/1bnp4/8/2BPP3/5N2/P4PPP/RNBQ1RK1 w kq - >>and white scores 58.8% of the points (well above average). >> >>I am analyzing the position now. > >Rybka thinks that White is slightly better here. Considering also that White >scores only 48.8% after the Nge7 move (a ten percent swing from this >alternative) it seems to me that it is not as good for black as Nge7. Of >course, I am not a chess expert. Maybe someone like Robin Smith can offer more >insight. It is dangerous but that doesn't mean it is necessarily bad. According to my database black as won many games with this line recently. 7...Nge7 is a good move but theory says 8.cxd4 d5 9.exd5 Nxd5 10.Ba3 Be6 11.Qb3 is equal. Michael >Analysis from E:\whatabout.epd >12/22/2005 11:47:10 AM Level: 7200 Seconds >Analyzing engine: Rybka v1.0 Beta.w32 > >1) "what about .. Bb6 c > Avoid move: > Best move (Rybka v1.0 Beta.w32): Nb1-c3 > Not found in: 2:00:00 > 3 00:00 840 9.150 +0.31 Nb1c3 > 4 00:00 1.829 17.026 +0.25 Nb1c3 > 5 00:01 10.056 38.711 +0.36 Nb1c3 Nc6a5 > 6 00:01 20.915 45.665 +0.26 Nb1c3 Bc8g4 Qd1b3 > 7 00:01 51.300 48.685 +0.04 Nb1c3 Ng8f6 Bc1f4 00 > 7 00:03 140.204 57.062 +0.14 Bc4b5 a7a6 Bb5a4 Bc8d7 > 8 00:03 156.793 58.362 +0.06 Bc4b5 a7a6 Bb5a4 Bc8d7 Nb1c3 > 9 00:05 280.855 59.753 +0.05 Bc4b5 Bc8d7 Nb1c3 Ng8e7 d4d5 Nc6a5 > 10 00:09 518.777 60.704 +0.05 Bc4b5 Bc8d7 Nb1c3 Ng8e7 d4d5 Nc6a5 Bc1f4 > 11 00:18 1.054.010 65.875 +0.01 Bc4b5 Bc8d7 Nb1c3 Ng8e7 d4d5 Nc6a5 Bc1f4 >Ne7g6 > 11 00:25 1.461.362 63.537 +0.08 Nb1c3 Ng8f6 h2h3 Bb6a5 Qd1b3 00 Rf1e1 >Bc8d7 > 12 00:43 2.470.458 60.255 +0.08 Nb1c3 Ng8f6 h2h3 Bb6a5 Qd1b3 00 Rf1e1 >Bc8d7 d4d5 > 13 01:33 5.252.573 59.017 +0.11 Nb1c3 Ng8f6 h2h3 Bb6a5 Qd1b3 00 e4e5 >d6xe5 d4xe5 Ba5xc3 > 14 02:52 9.859.016 59.036 +0.05 Nb1c3 Ng8f6 h2h3 Bb6a5 Qd1b3 00 d4d5 >Nc6e7 Rf1e1 Ne7g6 > 15 06:33 22.641.701 59.271 +0.01 Nb1c3 Ng8f6 h2h3 Bb6a5 Qd1b3 Ba5xc3 >Qb3xc3 Nf6xe4 Qc3c2 d6d5 > 16 17:16 58.230.898 57.597 +0.07 Nb1c3 Ng8f6 Bc1a3 00 e4e5 Nf6g4 h2h3 >Ng4h6 Rf1e1 Nh6f5 > 17 33:06 109.814.735 56.663 +0.08 Nb1c3 Ng8f6 Bc1a3 00 e4e5 Nf6g4 h2h3 >Ng4h6 e5xd6 c7xd6 > 18 1:03:45 213.857.145 57.257 +0.08 Nb1c3 Ng8f6 Bc1a3 00 e4e5 Nf6g4 h2h3 >Ng4h6 e5xd6 c7xd6 > 12/22/2005 12:54:20 PM, Time for this analysis: 01:07:05, Rated time: 2:00:00 > >0 of 1 matching moves >12/22/2005 12:54:21 PM, Total time: 1:07:11 AM >Rated time: 2:00:00 = 7200 Seconds
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