Author: Drexel,Michael
Date: 06:36:02 01/01/03
Go up one level in this thread
On January 01, 2003 at 08:48:39, Omid David Tabibi wrote: >[D] r1bqk1nr/pppp1ppp/2n5/2b1p3/1PB1P3/5N2/P1PP1PPP/RNBQK2R b KQkq b3 0 4 > >The Evans Gambit, arising after 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4, is a good >example of positional material sacrifice. By sacrificing his b pawn, white gains >a number if precious tempos, thus seizing the opening initiative. While the 4.b4 >gambit might not be better than the other 4th moves here, it usually reaches a >balanced position in which white has enough compensation for the sacrificed >pawn. usually? important are only chess games with a good defence by black. this gambit is probably at least slightly better for black (according to latest theory). I give you some examples: Gikas,B (2254) - Kosashvili,Y (2543) [C52] Curacao 40th anniv op Curacao (3), 02.11.2002 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 [4...Bb6 5.a4 a6 6.Nc3 (6.0-0 Nf6 7.d3 d6 8.c3 0-0 9.Be3 Bxe3 10.fxe3 Ne7 11.Qe1 Ng6 12.Nbd2 Qe7 13.Nh4 Be6 14.Nf5 Qd7 15.g4 Bxc4 16.dxc4 Nxg4 17.Qg3 Nh6 18.h4 Kh8 19.Kh2 Rg8 20.h5 Ne7 21.Nf3 Nexf5 22.Qh3 g5 23.exf5 g4 24.Qh4 Qxf5 25.e4 Qf4+ 0-1 Bueno Abalo,M-Korneev,O/Ferrol 2002) 6...d6 7.Nd5 Nf6 8.Nxb6 cxb6 9.d3 0-0 10.c3 d5 11.exd5 Nxd5 12.Ng5 f6 13.Ne4 Kh8 14.0-0 Be6 15.Rb1 Qd7 16.Re1 Bg8 17.Bd2 Rfd8 18.Qf3 Nce7 19.Bb3 Qf5 20.Qxf5 Nxf5 21.Bd1 Nd6 22.Nxd6 Rxd6 23.Bf3 Rd7 24.Bg4 Rd6 25.Bf3 Rd7 26.d4 exd4 27.cxd4 Bf7 28.Bg4 Rdd8 29.Rbd1 h5 30.Be2 Rac8 31.Rc1 Kg8 32.Kf1 g6 33.g3 Kg7 34.h3 Rxc1 35.Rxc1 Rd7 36.b5 a5 37.g4 hxg4 38.hxg4 Nc7 39.f3 Bb3 40.Bd1 Bxd1 41.Rxd1 Kf7 42.Rc1 Nd5 43.Ke2 Rc7 44.Rxc7+ Nxc7 45.Kd3 Nd5 46.Be3 Ke6 47.Bc1 Kd6 48.Bh6 ½-½ Comp Deep Shredder-Milov,V/Biel 2002] 5.c3 Ba5 [5...Bd6 6.d4 Nf6 7.0-0 0-0 8.Re1 h6 9.Nbd2 Re8 10.Bd3 exd4 11.cxd4 Bf8 12.e5 Nd5 13.Bc4 Nb6 14.Bb3 d6 15.Qc2 dxe5 16.Nxe5 Nxe5 17.dxe5 Be6 18.Bb2 Nd5 19.Qe4 Nb4 20.Rad1 Qc8 21.a3 Bxb3 22.Nxb3 Nc6 23.f4 Qe6 24.Qc2 Qg4 25.f5 Rad8 26.Rxd8 Rxd8 27.e6 f6 28.Rf1 Qa4 29.Qc3 Qb5 30.Qg3 Rd3 31.Qg6 Rxb3 32.Qf7+ Kh7 0-1 Sermek,D-Mikhalchishin,A/Bled 2002; 5...Be7 6.Qb3 Nh6 7.d4 Na5 8.Qb5 Nxc4 9.Bxh6 gxh6 10.Qxc4 exd4 11.cxd4 c6 12.d5 Bf6 13.e5 Bg7 14.d6 b5 15.Qg4 0-0 16.Nbd2 f6 17.0-0 fxe5 18.Rae1 Qf6 19.Qb4 a5 20.Qc5 Qe6 21.a4 bxa4 22.Nxe5 Qd5 23.Qxd5+ cxd5 24.f4 Ra6 25.Ra1 Rxd6 26.Rxa4 Ra6 27.Nb3 d6 28.Nf3 Bd7 29.Rxa5 Rxa5 30.Nxa5 Rxf4 31.Rd1 d4 32.Nb3 Ba4 33.Rd3 Bb5 34.Rd2 d3 35.Nc1 Bc3 36.Rd1 d2 37.Nxd2 Bxd2 0-1 Pirrot,D-Jenni,F/Cappelle la Grande 2002/CBM 87 ext (37)] 6.d4 d6 7.Qb3 Nxd4 8.Nxd4 exd4 9.Bxf7+ Kf8 10.Bxg8 Rxg8 11.0-0 d3 12.Qd5 Bb6 13.e5 Qd7 14.exd6 Qf5 15.Qxf5+ Bxf5 16.dxc7 Rc8 17.Na3 Rxc7 18.Nb5 Rd7 19.Ba3+ Kf7 20.Nd6+ Kg6 21.Rad1 h5 22.Rfe1 Rgd8 23.Nc4 Bc7 24.Bc5 b5 25.Nd2 Ba5 26.Be7 Rc8 27.Bb4 Bxb4 28.cxb4 Rc2 29.Nf3 d2 30.Ne5+ Kh7 31.Rf1 Rd5 32.f4 Rxa2 33.Kf2 Bc2 0-1 4...Bb6 is known to be save. black can play for a win in the complicated lines after 4...Bxb4. > >Now let us see how the top engines evaluate this position. There is not much >tactics involved here, so this gives us a good opportunity to compare the >programs' evaluation (their chess knowledge). > >In the table below, the evaluation of each engine is recorded after 1 minute >analysis (since the evaluation is largely positional, no significant score >change was noticed from one ply to another, so most probably even deeper >searches will not change the result): > > >Engine Score >------ ----- >Junior 7 0.06 >Fritz 7 -0.41 >Shredder 6.02 -0.33 >Chess Tiger 14 -0.82 (Gambit Tiger 2 also produced the same score) >Hiarcs 8 -0.84 >Crafty 19.1 -0.81 Shredder 7 -0.21 > > >Interesting points: > > - Junior 7 was the only program who evaluated the position realistically. > I think junior evaluates this position too optimistic. > - Gambit Tiger 2 which is tuned for sacrificial play, did not evaluate > the position differently from Chess Tiger 14. > > - Hiarcs 8 which is said to incorporate the most chess knowledge, displays > the least chess understanding in this position! (Conclusion: more chess > knowledge does not necessarily mean better evaluation.) > >Omid. > >P.S. An analysis of Fritz 8 and Shredder 7 will be appreciated. btw Happy New Year
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