Author: Joachim Rang
Date: 14:05:47 10/15/05
Go up one level in this thread
On October 15, 2005 at 16:40:42, Uri Blass wrote: >I played a blitz game. > >I did not play well in the opening and got the following position >It was obvioud for me that I have to play Ne8 > >surprisingly Fruit default never considers that move and prefer sacrificing a >piece for 2 pawns. > >I wonder if the sacrifice is good. >This sacrifice also change my opinion about fruit and now I am not sure if >increasing the value of pawns and pawn structure to 102 is really productive for >fruit. > >I thought that it should evaluate pawns more but it seems that fruit evaluate >pawns too much here(otherwise I do not udnerstand how it can give black the >advantage at small depth). > >6...Nxd4 7.Qd3 Bc5 8.exf6 Qxf6 > ³ (-0.59) Depth: 3/11 00:00:00 > > >Note that it is possible that my evaluation is wrong and fabien has better >evaluation function than my knowledge. > >I am also interested in your opinion about the position. > >What is the best practical chance of black? >6...Ne8 based on my human knowlede or 6...d5 based on fruit's choice when fruit >even does not expect white to play the obvious exf6. > >1161: SpriD - Uri_Blass, Rated game, 5m + 0s 2005 >[D]r1bq1rk1/pppp1ppp/2n1pn2/4P3/1bPP4/2N5/PPQ2PPP/R1B1KBNR b KQ - 0 1 > >Analysis by Fruit 2.2: > >6...Nxd4 > -+ (-2.17) Depth: 1/5 00:00:00 >6...Nxd4 7.Qd3 > -+ (-2.59) Depth: 2/11 00:00:00 >6...Nxd4 7.Qd3 Bc5 8.exf6 Qxf6 > ³ (-0.59) Depth: 3/11 00:00:00 >6...Nxd4 7.Qd3 Bc5 8.exf6 Qxf6 > ³ (-0.59) Depth: 4/11 00:00:00 >6...Nxd4 7.Qd3 Nf5 8.exf6 Qxf6 9.Nf3 > = (0.09) Depth: 5/16 00:00:00 >6...Ng4 7.Nf3 f5 8.Bf4 b6 > ³ (-0.31) Depth: 5/16 00:00:00 >6...Ng4 7.Nf3 Be7 8.Bd3 f5 9.0-0 > = (0.09) Depth: 6/19 00:00:00 42kN >6...d5 7.Nf3 Ne4 8.Bd3 f5 9.exf6 Nxf6 > ³ (-0.28) Depth: 6/22 00:00:00 90kN >6...d5 7.exf6 Nxd4 8.Qd1 Qxf6 9.Nf3 Nxf3+ 10.Qxf3 Qe5+ 11.Be2 dxc4 > = (0.04) Depth: 7/22 00:00:00 125kN >6...Nxd4 7.Qd3 Nc6 8.exf6 Ne5 9.Qd4 Qxf6 > = (0.01) Depth: 7/22 00:00:00 146kN >6...Nxd4 7.Qd3 Nc6 8.exf6 Ne5 9.Qe4 Qxf6 10.Nf3 > = (0.14) Depth: 8/22 00:00:00 214kN >6...d5 7.exf6 Nxd4 8.Qd1 Qxf6 9.Nf3 Nxf3+ 10.Qxf3 Qe5+ 11.Be2 dxc4 > = (0.04) Depth: 8/22 00:00:01 261kN >6...d5 7.Nf3 Ne4 8.Bd3 f5 9.exf6 Nxf6 10.Bg5 h6 11.Bh7+ Kh8 > = (0.24) Depth: 9/26 00:00:01 599kN >6...d5 7.Nf3 Ne4 8.Bd3 f5 9.exf6 Nxf6 10.Bg5 h6 11.cxd5 exd5 12.Bh7+ Kh8 > = (-0.02) Depth: 10/26 00:00:02 1330kN >6...d5 7.Nf3 Ne4 8.Bd3 f5 9.exf6 Nxf6 10.Bg5 h6 11.Be3 dxc4 12.Bxc4 Nd5 > = (0.00) Depth: 11/30 00:00:03 2131kN >6...d5 7.Nf3 Ne4 8.Bd3 f5 9.exf6 Nxf6 10.cxd5 exd5 11.0-0 Kh8 12.a3 Bd6 13.Re1 > = (0.15) Depth: 12/30 00:00:06 3992kN >6...d5 7.Nf3 Ne4 8.Be2 b6 9.cxd5 exd5 10.0-0 Bxc3 11.bxc3 Bg4 12.Bf4 Qd7 13.Rab1 >Bxf3 14.Bxf3 > = (0.21) Depth: 13/32 00:00:15 10143kN >6...d5 7.Nf3 Ne4 8.a3 Bxc3+ 9.bxc3 b6 10.Bd3 Ba6 11.Bxe4 dxe4 12.Qxe4 Na5 13.Ng5 >g6 14.0-0 Bxc4 15.Qh4 > ² (0.41) Depth: 14/36 00:00:30 20793kN >6...Nxd4 7.Qd3 c5 8.exf6 Qxf6 9.Be3 d6 10.0-0-0 Bxc3 11.Qxc3 e5 12.Bd3 Bg4 13.f3 >Bf5 14.Kb1 Bxd3+ 15.Qxd3 > ² (0.32) Depth: 14/36 00:00:40 28051kN >6...Nxd4 7.Qd3 c5 8.exf6 Qxf6 9.Be3 d6 10.0-0-0 Bxc3 11.Qxc3 e5 12.Bd3 Bf5 >13.Kb1 Qg6 14.g3 Bxd3+ 15.Qxd3 e4 > ² (0.54) Depth: 15/36 00:01:03 44340kN >6...d5 7.Nf3 Ne4 8.a3 Bxc3+ 9.bxc3 b6 10.Bd3 Ba6 11.Bxe4 dxe4 12.Qxe4 Na5 13.Ng5 >g6 14.0-0 Bxc4 15.Qh4 h5 > ² (0.42) Depth: 15/37 00:01:13 51251kN >6...d6 7.exf6 Nxd4 8.Qe4 Qxf6 9.Bd3 g6 10.Nge2 Nxe2 11.Kxe2 Bxc3 12.bxc3 Qxc3 >13.Bd2 Qg7 14.Rhb1 f5 15.Qh4 > ² (0.27) Depth: 15/37 00:01:40 70293kN >6...d6 7.exf6 Nxd4 8.Qe4 Qxf6 9.Bd3 g6 10.Nge2 Nxe2 11.Kxe2 Bxc3 12.bxc3 Qxc3 >13.Bd2 Qa3 14.Rhb1 f5 15.Qd4 e5 > ² (0.40) Depth: 16/43 00:02:00 84899kN >6...d6 7.exf6 Nxd4 8.Qe4 Qxf6 9.Bd3 g6 10.Nge2 Nxe2 11.Kxe2 Bxc3 12.bxc3 Qxc3 >13.Bd2 Qf6 14.h4 e5 15.h5 Bf5 16.Qxb7 Bxd3+ 17.Kxd3 > ² (0.34) Depth: 17/43 00:03:30 146157kN >6...d6 7.exf6 Nxd4 8.Qe4 Qxf6 9.Bd3 g6 10.Nge2 Nxe2 11.Kxe2 Bxc3 12.bxc3 Qxc3 >13.Bd2 Qf6 14.h4 e5 15.Qf3 Qe7 16.Kf1 Rd8 > ² (0.53) Depth: 18/45 00:06:02 253112kN >6...d6 7.exf6 Nxd4 8.Qe4 Qxf6 9.Bd3 g6 10.Nge2 Nxe2 11.Kxe2 Bxc3 12.bxc3 Qxc3 >13.Bd2 Qf6 14.h4 e5 15.Qf3 Qe7 16.Kf1 Rd8 17.Kg1 > ² (0.56) Depth: 19/55 00:24:28 1018718kN >6...d5 7.Nf3 Ne4 8.a3 Bxc3+ 9.bxc3 b6 10.cxd5 exd5 11.Bd3 Bf5 12.Ng5 g6 13.Nxe4 >dxe4 14.Bb5 e3 15.Qa4 exf2+ 16.Kxf2 Na5 17.Rf1 a6 18.Be2 Re8 > ² (0.43) Depth: 19/55 00:31:13 1292271kN > >(, 15.10.2005) indeed an unclear position. After 6...Ne8 white has with 7.Nf3 a very fine game. Fruit 2.2 gives here +0.66 and Shredder 9 already 1.28. After 6...d5 7.exf6 black gets at least active pieces and can create some threats against the white king. However it is not sufficient to achive equality. My tests suggest rather to lower the value of a pawn than to increase it but I don't think we will find a better value than we have right now. Joachim
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