Author: Bruce Moreland
Date: 10:19:49 02/02/98
Go up one level in this thread
On February 01, 1998 at 18:20:48, Don Dailey wrote: >Hi People, > >I have gone through all the posts on the ECM test set for the first >100 problems. Basically we are trying only to correct the problems >and discover side solutions or cooks. We are throwing out a few and >changing a few. If I missed someones post please forgive me but this >is not an easy task. A lot of your comments were weak, ambigious etc, >so I had to take some guesses. Yes. This is not a very good place to do this work, since it isn't convenient to download all of the pertinent stuff. I'm going to risk being redundant by commenting on some of these, since it's so hard to go back and figure out what others have said. >DELETE > > 14 - most thought it very vague > 19 - seems to have at least 3 solutions, vague > 28 - consensous on vagueness > 63 - conflicting. Positonal and changing solutions. > 68 - Amir and Bob both want dropped. > 82 - vague problem. > 84 - vague > 91 - too many solutions 14) Nd5 (the key) wins the exchange for a pawn. Mine finds this initially in a few seconds, with a score of +0.3 or so. Other stuff gets in the way but after an hour and twelve minutes mine sticks with this for good at around +0.6, ending up at +0.73 after four hours. 19) There is more than one way to win big in this position. 28) Mine lines Nf6+ gxf6 Rxf4 after an hour, at -0.51. This one stll might be correct, since Rxf4 is the key, but I haven't let it go for longer. 63) Ncxd5 (the key) is +2.6 after 20 seconds, but I haven't run it longer. 68) Don't know, only ran it for an hour. 82) I get exf6 (the key) in 38 seconds +3.36, which replaced the previous move, Qg3, which had been at +2.56. I let it go for four hours. The last PV I got was at two hours and eighteen minutes, and was +6.46. So if this was vague, it's also crushing. 84) Mine finds Bxg6 (the key) in about a minute and a half, at +2.19, and still has it after an hour at +2.30. Other moves might also win, I don't know. 91) I think there is more than one way to win big here, too. >CHANGE > > 11 - Change key to (Nxg4) > 17 - Add Nf6+ as a solution (Rxd5 Nf6+) > 60 - Change solution to (Qh6) > 81 - Add Bxc6 as side solution I think that, in general, if someone wants to add a new move, they should either get a really big score or run for a really long time and end up with a score that is still obviously winning. In some of these cases, mine gets the proposed new move initially, then switches. 11) The key is already Nxg4. 17) No opinion. 60) No opinion. Mine also selects Qh6. 81) The key seems to get you into a B vs N ending with an extra outside passer. I assume that the proposed new move wins a pawn but leaves more material on. Unless it also leads to a position a strong player (not us) would like as much, I wouldn't like to add it as a new solution to anything, since it wouldn't be as good as the original key. But on the other hand, this isn't a positional test, so perhaps it would be best to remove it from any test sets that are derived from ECM. This one is easy, anyway, you'll get either Qb1+ or Bxc6 in a very short time. >There are still 4 problems in the first 100 that I cannot resolve. I >would like 1 more pass at these with more committal decisions. If I >get no more comments I will just drop them. > > >29 Rgxg6 ; Amir wants Rxa6 as side solution. >29 Rgxg6 ; Bob thinks Rgxg6 might be best move despite Amirs side. >29 Rgxg6 ; Ernst thinks Rf4 might be best. >29 Rgxg6 ; Don says Cilkchess likes Rf4 with score jump I think Rf4 might end up better, too, but I only ran it for 3 minutes. >43 Bxg2+ ; Amir wants Qxc2 as side solution. >43 Bxg2+ ; Bob gets solid Bxg2+ and sticks. Amir thinks there is a >side. >43 Bxg2+ ; Don says cc2 oscillates between Qxc2 and Bxg2 for an >hour No opinion. >51 Rxh2 ; Amir isn't sure it's correct >51 Rxh2 ; Bob and Amir are both not sure. >51 Rxh2 ; Don thinks Qc5 might be worth looking at. >51 Rxh2 ; Ernst get's fail high with Rxh2 thinks best. >51 Rxh2 ; Don says CC2 likes Qc5 after 1 hour I still have Qxc5 after an hour, but I think Ernst's line should get people looking at Rxh2 for longer, possibly. > >76 fxg6 ; Amir wants fxe6 as side solution. >76 fxg6 ; Bob seems to believe fxg6 is clearly better than Amirs >side. >76 fxg6 ; Ernst agree's to side solution of fxe6 >76 fxg6 ; Don says fxe6 played by CC2 after 1 hour but fxg6 is >close. fxg6 and fxe6 are both > +5 in a very short time. bruce
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