Author: chandler yergin
Date: 18:00:03 01/17/05
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Thank you for your input! I appreciate a logical feedback; without sarcasm, ad homenims etc... I hope my response will be taken the same way.. You are right I don't know the 'jargon'; I just play chess, and want to understand the game, and positions, and use the "tools" at my disposal to the best advantage. Here is the way I see the Position you gave. New game, [D]r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w - - 0 1 Analysis by Shredder 8: 1. ± (0.79): 1.h3 Bxf3 2.gxf3 Nf7 3.f4 g6 4.Be3 Kd7 5.Kd2 Bh4 6.Ne2 Qe7 7.Qb3 Raf8 8.Raf1 Kc8 2. ² (0.37): 1.h4 Nxf3+ 2.gxf3 Bxh4 3.fxg4 Bxg3+ 4.Kd2 Bh4 5.Kc2 Kd7 6.Qe2 Qe7 7.g5 Bxg5 8.Bxg5 Qxg5 9.Rag1 Qe7 3. ² (0.56): 1.Qe2 Kd7 2.h3 Bxf3 3.gxf3 Nf7 4.Kd1 g6 5.Kc2 Bh4 6.Qg2 Qe7 7.Bf4 Raf8 8.Rag1 Kc8 9.Kb1 4. ² (0.45): 1.Be3 Rf8 2.Be2 Nxf3+ 3.gxf3 Bh3 4.Qd3 g6 5.Kd2 Bg2 6.Rhg1 Bxf3 5. ² (0.39): 1.Rf1 Kd7 2.Be3 Nxf3+ 3.gxf3 Bh3 4.Rf2 Kc8 5.Kd2 Na5 6.Qa4 c5 7.Rd1 Qc7 8.Ne2 cxd4 9.cxd4 Bh4 (, 17.01.2005) In this position, the Program has determined there are 43 Possible moves for White. It is a "Non-Forcing" Position, therefore, the ‘weighted' Static Positional Programmed Values come into play. These are based on Mobility, Space, King Safety, Pawn Position, strong & weak Squares etc.. These ‘weighted' values are shown after the Decimal Point. The Significant Digit is the 1st one! It shows 0.xx telling you it is a Balanced position, with no material advantage for either side. From these 43 possible moves, the Program will search each move in turn, one Ply deeper each iteration. Using Multiple Lines... we get a peek into what the Program is seeing, and how it evaluates what it considers to be the ‘Best" 5 moves, based on the weighted static positional values. It has searched all 43 moves to about 15 Ply almost immediately. As it goes one Ply deeper, in turn for all 43 moves.. the search depth, for the most promising moves.. i.e, the first 5 goes as deep as 40 Ply. With each iteration, searching all 43 moves to 16 ply, 17ply, 18 ply etc.. It searches the most promising moves a bit deeper also. After searching all 43 moves to a depth of 19 Ply, and the most promising moves to 46 ply,it still has not found any Material advantage for either side. Now.. At the beginning, we can set how many plies we want to see, for these 5 or 4 or 3 most promising Lines. Eight or Nine moves deep for each Line is reasonable, and that's what we show. Our Choice. Each Engine will evaluate the weighted "Static Positional Values" differently, depending on how they are programmed. Crafty, may put more emphasis on Pawn Structure, while another may consider, King Safety more important. More aggressive programs like Fritz may rate ‘Space" as being more important, and show a 0.85 or higher... What is so hard to understand here? Please remember for old EPD's listed, if you have tested your engines with them, you may find as I have, the what was considered to be the 'best' move has changed, as Programs have gotten stronger, and more games added to the Databases. Again... the number of "possible" moves in a position, determines the complexity of the search, and the time needed increases of course for each ply depth. Also, in a 'balanced' position, the Program is telling you it's a draw, unless it's a clear Material advantage of +3.xx or -3.xx Try to forget 'preconceived' notions, and out more trust in Chessbase. These guys do know what they are doing... Thanks, Chan
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