Author: Uri Blass
Date: 05:08:16 05/12/04
Go up one level in this thread
On May 12, 2004 at 07:44:47, martin fierz wrote: >On May 12, 2004 at 02:15:52, Uri Blass wrote: > >>[D]r1bq1rk1/ppp2ppp/2n2b2/3Pp3/8/3P1N2/PPP1BPPP/RN1Q1RK1 b - - 0 1 >> >>In this position I considered the move e4 that wins material but rejected it. >> >>I calculated e4 dxe4 Bxb2 dxc6 Bxa1 c3 and I did not like my trapped bishop at >>a1 so I decided to keep the pair of bishops and played Ne7 with the idea to take >>the pawn with the knight(the alternative c4 e4 dxe4 Bxb2 is bad for white). >> >>I later analyzed it with chess programs and I found that the decision if to play >>e4 is a positional decision but they are not afraid of c3 >> >>The problem is that the line e4 dxe4 Bxb2 Nd1 Bxa1 Qxa1 is evaluated as only >>small advantage for black or even advantage for white by part of the programs. >> >>New game - Fritz 8, 40'/40 eim >>r1bq1rk1/ppp2ppp/2n5/3P4/4P3/5N2/P1PNBPPP/Q4RK1 b - - 0 1 >> >>Analysis by Quark: >> >>11...Ne7 12.Qd4 Re8 13.Bd3 Bg4 14.Rb1 >> ² (0.46) Depth: 6 00:00:00 31kN >>11...Ne7 12.Qd4 Re8 13.Bd3 Bg4 14.Rb1 >> ² (0.46) Depth: 6 00:00:00 41kN >>11...Ne7 12.Qd4 Ng6 13.e5 Bf5 14.Ne4 Qe7 >> ² (0.35) Depth: 7 00:00:00 109kN >>11...Ne7 12.Qd4 Ng6 13.e5 Bf5 14.Ne4 Qe7 >> ² (0.35) Depth: 7 00:00:00 220kN >>11...Ne7 12.Qd4 f6 13.c4 Bd7 14.Rb1 Qb8 15.e5 >> ² (0.47) Depth: 8 00:00:01 523kN >>11...Ne7 12.Qd4 f6 13.c4 Bd7 14.Rb1 Qb8 15.e5 >> ² (0.47) Depth: 8 00:00:02 612kN >>11...Ne7 12.Qd4 b6 13.c4 Qd6 14.e5 Qa3 15.d6 Nc6 >> ² (0.27) Depth: 9 00:00:08 2033kN >>11...Ne7 12.Qd4 b6 13.c4 Qd6 14.e5 Qa3 15.d6 Nc6 >> ² (0.27) Depth: 9 00:00:08 2120kN >>11...Ne7 12.Qd4 b6 13.c4 Ba6 14.Bd3 Qd7 15.Ne5 Qd6 16.Rc1 >> ² (0.33) Depth: 10 00:00:19 4864kN >>11...Ne7 12.Qd4 b6 13.c4 Ba6 14.Bd3 Qd7 15.Ne5 Qd6 16.Rc1 >> ² (0.33) Depth: 10 00:00:22 5765kN >>11...Ne7 12.c4 Qd6 13.Qc3 b6 14.e5 Qg6 15.Nd4 Bg4 16.Rb1 a5 >> = (0.17) Depth: 11 00:01:12 18617kN >>11...Ne7 12.c4 Qd6 13.Qc3 b6 14.e5 Qg6 15.Nd4 Bg4 16.Rb1 a5 >> = (0.17) Depth: 11 00:01:13 19029kN >>11...Ne7 12.Qd4 b6 13.Rb1 a5 14.c4 Qd6 15.e5 Qa3 16.Ra1 Bf5 17.Ng5 >> ² (0.28) Depth: 12 00:03:05 49439kN >>11...Ne7 12.Qd4 b6 13.Rb1 a5 14.c4 Qd6 15.e5 Qa3 16.Ra1 Bf5 17.Ng5 >> ² (0.28) Depth: 12 00:03:28 55826kN >> >>(blass, eim 12.05.2004) >> >> >>I think that this line is clearly better for black. > >i don't understand which line you mean - the one with ...Ne7 or the one with >...e4? The analysis by quark is after e4 dxe4 Bxb2 Nbd2 Bxa1 Qxa1 and it gives advantage for white. > >>I also think that I was wrong to be afraid of c3 but in the game I decided not >>to take risks in a line that I was not sure if I can calculate and keep my small >>advantage. > >i think it's clear that after ...e4 dxe4 Bxb2 Nbd2 Bxa1 Qxa1 white is on top >(unless i'm missing a tactical shot here). Black has material advantage of rook for piece and a pawn so I do not understand why white is on top. about being afraid of c3: if i see >that a piece of mine is trapped and i don't see how to get it out but also don't >see how it can be captured, i tend to avoid such a line because i might have >miscalculated or missed something - like you obviously did because you don't >seem to have considered the exchange sac for pawn+dominant center. I considered both lines in the game. Both of them were the reason that I rejected e4 but the main reason was the line of c3 that I evaluated as unclear. Without the line of c3 I evaluated e4 as the best move. Without the line e4 dxe4 Bxb2 Nbd2 Bxa1 Qxa1 I could probably decide to use more time to analyze e4 because without that line the potential profit from e4 is bigger. In the game I decided that it is not a good idea to think more about it and to have less time for the rest of the game and the possibility of e4 dxe4 Bxb2 Nbd2 Bxa1 Qxa1 influenced me inspite of the fact that I evaluated it as a clear advantage for black because I still did not evaluated it as winning. In case that the line with c3 was the only line for white I could probably decide to think more time because in this case the profit that I can get if the bishop is not trapped is bigger. It is possible that Qxd5 was better than both Ne7 and e4 but I rejected that move because I did not want to move again with the queen after Nc3 and decided that it is better if I can get the pawn without wasting time with the queen. I may be wrong about it and after all Ne7 with Nxd5 also waste time with the knight. Uri
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.