Author: Uri Blass
Date: 16:26:59 10/16/05
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On October 16, 2005 at 18:56:56, Robert Hyatt wrote: >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 believe this is the wrong way to tune any program. Otherwise you either see >piece for two pawn sacs all the time, and they are generally bad, even if it is >a piece for three pawns. Hence the "bad trade" code in Crafty, that simply >directly addresses this problem to prevent it for all cases... unless the trade >can lead to a draw... Interesting that fruit does not like to trade piece for 2 pawns all the time(otherwise it could not be so strong). In the game against Junior in WCCC it was Deep Junior that played the trade and lost. Interesting to find now that surprisingly Fruit also likes the trade and has positive score some moves later so maybe the error of Junior was later in the game and the trade was not so bad(it may be interesting if programs can beat Fruit with black after the trade). some analysis by Fruit(history threshold=50 that seems to be even stronger than original fruit) 59: Deep Junior - Fruit, 13th WCCC Reykjavik 2005 [D]r2q1rk1/pp2npp1/1bn1b2p/3p2BQ/8/1NNB4/PPP2PPP/2KR3R w - - 0 1 Analysis by Fruit 2.2: 13.Be3 Bxe3+ 14.fxe3 ² (0.29) Depth: 1/11 00:00:00 13.Be3 Bxe3+ 14.fxe3 Ng6 15.Bxg6 fxg6 16.Qxg6 ² (0.32) Depth: 2/11 00:00:00 13.Kb1 Bxf2 ² (0.42) Depth: 2/11 00:00:00 13.Kb1 Bxf2 14.Rhf1 = (0.21) Depth: 3/11 00:00:00 13.Kb1 Nb4 14.Be4 Bxf2 ² (0.26) Depth: 4/12 00:00:00 13.Kb1 Nb4 14.Be4 Bxf2 15.Nxd5 Nbxd5 16.Bxd5 Bxd5 17.Bxe7 Qxe7 18.Rxd5 = (0.11) Depth: 5/13 00:00:00 13.Kb1 Nb4 14.Qh4 Bxf2 15.Qxb4 hxg5 16.Qxb7 ² (0.32) Depth: 6/23 00:00:01 73kN 13.Kb1 Nb4 14.Be4 Re8 15.Bh4 Qc7 16.Bg3 ² (0.33) Depth: 7/23 00:00:01 166kN 13.Kb1 Qd7 14.Bxe7 Nxe7 15.Bb5 Qc8 16.Rd2 Bf5 17.Re1 = (0.13) Depth: 8/24 00:00:01 552kN 13.Kb1 Qd7 14.Bxe7 Nxe7 15.Qh4 Rae8 16.Rhe1 Bg4 17.f3 Bf5 18.Bxf5 Nxf5 = (0.23) Depth: 9/31 00:00:03 1603kN 13.Kb1 Qd7 14.Bxe7 Nxe7 15.Bb5 Qd6 16.Nd4 Nc6 17.Nxe6 fxe6 18.Ne4 Qf4 = (0.14) Depth: 10/31 00:00:06 3362kN 13.Kb1 Qd7 14.Bxe7 Nxe7 15.Bb5 Qc7 16.Qf3 Qd6 17.h4 a6 18.Bd3 f6 = (0.15) Depth: 11/39 00:00:14 8269kN 13.Kb1 Qd7 14.Bxe7 Nxe7 15.Qh4 Rfe8 16.Rhe1 Rac8 17.Nd4 Bg4 18.Be2 Bxd4 19.Rxd4 Bxe2 20.Rxe2 = (0.10) Depth: 12/42 00:00:29 17874kN 13.Bxh6 gxh6 14.Qxh6 Bf5 15.Bxf5 Nxf5 16.Qf4 Qf6 17.Rxd5 Nce7 18.g4 Nxd5 19.Nxd5 Qh6 20.gxf5 Qxf4+ 21.Nxf4 Bxf2 ² (0.39) Depth: 12/48 00:00:49 30956kN 13.Bxh6 gxh6 14.Qxh6 Bf5 15.Bxf5 Nxf5 16.Qf4 Qf6 17.Rxd5 Nce7 18.g4 Nxd5 19.Nxd5 Qh6 20.gxf5 Qxf4+ 21.Nxf4 Bxf2 22.Kb1 = (0.19) Depth: 13/50 00:01:13 46849kN 13.Bxh6 gxh6 14.Qxh6 Bf5 15.Bxf5 Nxf5 16.Qf4 Qf6 17.g4 Qh6 18.g5 Qh3 19.Nxd5 Rfd8 20.Kb1 Rac8 21.Rhe1 ² (0.39) Depth: 14/52 00:03:00 117073kN (, 17.10.2005) Uri
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