Author: Howard Exner
Date: 02:04:43 01/22/98
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On January 21, 1998 at 14:24:23, Ernst A. Heinz wrote: >Hi all, > >I am currently running the original ECM through "DarkThought" >with 90 sec per position. In addition to the inconsistencies >already pointed out by Amir, "DarkThought" begs to differ on >some more positions among the first 99 positions (even after >20 min analyses each). > >ECM #016 >original solution = [ Rxc5 ] >"DarkThought" says = [ dxe3 ] Rxd8+ Rxd8 Bb2 Qd6 ... is equally good > (score = +0.4 after iteration #13) >ECM #031 >original solution = [ Nxd4 ] >"DarkThought" says = [ Rd6, Qd5, Qa6, h6, h5, Kh8 ] are equally good > (score = 0.8 after iteration #13) >ECM #070 >original solution = [ e4 ] >"DarkThought" says = [ Rf3 ] Kh1 g5 d4 exd4 Re6 Qg7 ... > (score = +1 after iteration #13, > g5 directly seems to be a transposition) >ECM #075 >original solution = [ Nh6 ] >"DarkThought" says = [ Qh4, g6 ] are also good > (score = 1.2 after iteration #13) > >ECM #099 >original solution = [ Qxd5 ] >"DarkThought" says = [ b4 ] Rb5 Qxd5 Be5 Qb3 Bc6 ... is equally good > (changes between both with scores around +0.3) > >What do others think about these alternatives? > >=Ernst= I'm using the ECM book to check the findings of you and Amir and am finding that there are many positions in ECM that you both have discovered cooks in. Actually I will probably stop checking the book lines since every questionable move you both have exposed is the result of inaccurate defense. From your above examples here are the actual moves from ECM for 16 and 99. ECM16 Sokol'skij vs Botvinnik (may be a variation as not all ECM examples were actual game moves) 1... Rxc5 2.Bxc5 Nf3 3.gxf3 Bxf3 4.Qc2 Bxd1 5.Qxd1 Qg5 -+ This is what the book says but you can clearly see the entire line is flawed. Nf3? Qc2? ECM99: Miranovic vs Gorev 1.Qxd5! Rxd5 2.Nf6 Kh8 3.Bg5! Kg7 4.Rh7 Kf8 5.Rh8 Ke7 6.Nd5 +- Again your programs will expose the flaws in this one also. Back in 1980 when this book was printed they could have used your programs to cross check these games :-) I wonder how many books written today use computer chess software to confirm tactical lines?
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