Author: Sune Fischer
Date: 03:15:27 11/23/02
Go up one level in this thread
On November 23, 2002 at 06:03:50, Uri Blass wrote: >On November 23, 2002 at 05:52:51, Sune Fischer wrote: > >>On November 23, 2002 at 05:48:25, Uri Blass wrote: >> >>>On November 23, 2002 at 05:45:19, Sune Fischer wrote: >>> >>>>On November 23, 2002 at 05:02:40, Uri Blass wrote: >>>> >>>>>The repetition is tactics but the fact that you do not see a positive score for >>>>>other moves is evaluation. >>>>> >>>>>Movei see positive score for other moves. >>>> >>>>Other moves, you mean c3? >>>>I guess c3 is only considered at low depth where it can't see the tactics. >>>> >>>>-S. >>> >>>I mean that movei gives positive score for moves like 1...Rb8 or 1...Rb7 so it >>>is not going to be happy with 1...Rxb2 in case of a draw score. >> >>I don't see why 1..Rb8 or Rb7 should give a positive score, if you don't intend >>Rxb2! then I see no way forward for black. What is the PV? > >Here is the pv of movei without verifyied null move pruning before finding Rxb2 > >depth=14 +0.59 b3b8 e3e4 f5e4 f3e4 b8e8 e4d4 e8e2 d4c3 e2d2 c3d2 h7h6 h2h4 h6h5 >d2e3 f6e6 e3d2 e6d5 >Nodes: 12019985 NPS: 188341 >Time: 00:01:03.82 > >depth=14 +0.61 b3b6 h2h4 h7h5 d2g2 b6b7 g2d2 b7g7 e3e4 g7g1 e4e5 f6e6 d2h2 e6d5 >f3e3 g1g3 e3d2 >Nodes: 22524141 NPS: 184881 >Time: 00:02:01.83 I gave the position after Rb6, it can only see a draw now. Remember black can still play Rxb2, so white has to "do something about it". So I think h4 looks a bit odd. 7 28 11 22671 1.e4 fxe4+ 2.Kxe4 Re6+ 3.Kf3 Kf5 4.Rg2 Rg6 5.Rg3 8 26 21 56608 1.e4 fxe4+ 2.Kxe4 Re6+ 3.Kf3 Kf5 4.Rg2 Rg6 5.Rf2 Rg1 9 0 47 146578 1.e4 fxe4+ 2.Kxe4 Re6+ 3.Kf3 Kf5 4.Rg2 Re2 5.Rg5+ Kf6 6.Rg2 Kf5 9 0 120 416379 1.h3 Re6 2.Rg2 Rd6 3.Rd2 Rh6 10 0 222 800215 1.h3 Rxb2 2.Rxb2 c3 3.Rb6+ Ke7 4.Rb7+ Kd6 5.Rb6+ Ke7 11 0 495 1832059 1.h3 Re6 2.Rg2 Rd6 3.Rd2 Re6 4.e4 Rh6 12 -4 1153 4256456 1.h3 Re6 2.Rd1 Kg6 3.Rc1 Rd6 4.Rd1 Kh5 5.Rd2 Kh4 6.Kg2 Rb6 12 -3 1547 5745396 1.Rg2 12 0 1745 6498785 1.Kf2 Rb3 2.Ke1 13 0 4217 15612657 1.Kf2 Rb3 2.Kf3 Rc6 14 0 12196 43569716 1.Kf2 Rb3 2.Kf3 Kg6 3.Kf3 >>Staticly I don't see a reason to give a high score for black, the only passed >>pawn is blocked. > >protected passed pawn by a pawn is a good reason to give bonus for black even if >it is blocked. yes that is true, a small bonus, but not a high score for black IMO. >The reason for movei are different > >h2 f4 get the same score as h7 f5 by piece square table >a4 c4 d3 get better score than a3 e3 b2 based on piece square table > >The black king can get into the center so it get better score than the white >king based pievce square table. > >The black rook has better mobility than the white rook so black get a bonus for >better mobility. Well black has terrain, but it's hard to say if the pawns are weakened or strong, afterall white's king is closer, so staticly... -S. >Uri
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