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truefriends
Member since Nov-28-06 · Last seen Dec-21-14
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   truefriends has kibitzed 2379 times to chessgames   [less...]
   Dec-17-14 truefriends chessforum
 
truefriends: < AylerKupp: <truefriends> I am no spacebar master either but it is difficult to answer your question without some questions of my own.: 1. What do you mean when you say that engine A is slightly stronger than engine B? That in an engine vs. engine competition engine A
 
   Dec-17-14 The World vs Naiditsch, 2014 (replies)
 
...
 
   Dec-14-14 AylerKupp chessforum (replies)
 
...
 
   Nov-23-14 Carlsen vs Anand, 2014 (replies)
 
truefriends: We should applaud Anand for trying at the pressconference. Think it's well deserved!
 
   Nov-23-14 Analysis Forum chessforum (replies)
 
...
 
   Nov-21-14 Anand vs Carlsen, 2014 (replies)
 
truefriends: Just like Yesterday... Anand is following the mainlines in Correspondence Chess instead of the most played OTB moves.
 
   Nov-20-14 Carlsen vs Anand, 2014 (replies)
 
truefriends: With the inclusion of 14. b3 Be7 this was all played before...
 
   Aug-27-14 M Vachier-Lagrave vs Carlsen, 2014 (replies)
 
truefriends: The official site gives: <-1.22 14. Nxb4 d5 15. Qf4 dxc4 16. O-O bxc2 17. Bxb6 cxb6 18. Nxc2> But after <18. Nd5!> white should be fine... (Sorry had to fix a typo ;-) ) Seems like they are not using the latest DV of SF... Maybe SF5
 
   Aug-21-14 hoodrobin chessforum (replies)
 
...
 
   Aug-21-14 chessgames.com chessforum (replies)
 
truefriends: In the <Chessgames Challenge> there are 4 votes for the incorrect <Exd5> (instead of <exd5>). Could you please correct this and add them to the number of <exd5> votes? Many thanks in advance!
 
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   Jan-26-14 R Rapport vs Aronian, 2014
   Nov-21-13 Anand - Carlsen World Championship (2013) (replies)
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   Oct-29-13 bigpeta66 chessforum (replies)
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   Jan-15-12 The World vs G Timmerman, 2007 (replies)
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   Jan-23-11 Carlsen vs Nakamura, 2011 (replies)
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TRUEFRIENDS Chessforum

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 34 OF 34 ·  Later Kibitzing>
Oct-13-13  DcGentle: <truefriends> *hmmm* Pity, but you would have won anyways, this is what I believe.
Dec-10-14
Premium Chessgames Member
  truefriends:


click for larger view

Can White still win this?
Probably not...

If not...
What is the best way to try to trick black into making a mistake?

Dec-10-14
Premium Chessgames Member
  hoodrobin: Welcome back to your forum, <truefriends>. How is the <reversed opening> doing? ;-)
Dec-10-14  cormier: <truefriends> ... i wish you well .... like you possibly know, my faith is universal ..... but i hope the best for you ...... hope of a better tomorrow .......
Dec-11-14
Premium Chessgames Member
  truefriends: <hoodrobin> If you mean my surgery. It took a bit more steps towards it than I anticipated. And the hospital doesn't seem to be in a hurry ;-) For example had to wait almost 2 months to make the 3 necesarry scans. And now with the holidays coming... So it is sceduled for january 2015.
Dec-11-14
Premium Chessgames Member
  hoodrobin: <truefriends> So you must be patient and hopeful. I'm rooting for you, if I may say so.
Dec-11-14
Premium Chessgames Member
  truefriends: Today I started the Final of the 2014 Winter Championship (A) on the site I play Correspondence Chess.

If anyone is interested...

http://www.chesshere.com/championsh...

Dec-11-14
Premium Chessgames Member
  hoodrobin: Are you <truefriends> at <chesshere.com> too? You must be a strong CC player to have reached the Final. I wish I were strong at CC or OTB... Well I suppose I like chess and that's all.
Dec-12-14
Premium Chessgames Member
  hoodrobin: There's only one player from the U.S. and one from Australia. I guess you are the former.
Dec-12-14
Premium Chessgames Member
  truefriends: I am neither... But my flag has the same colors as both ;-)
Dec-12-14
Premium Chessgames Member
  hoodrobin: Are you from Netherlands? I was prepared to say that your English sounds very American. lol. (or does it really sound American...?)
Dec-13-14
Premium Chessgames Member
  truefriends: Nope... born and raised in Holland :-)
Dec-13-14
Premium Chessgames Member
  hoodrobin: Hello, fellow European !
:-)
Dec-13-14
Premium Chessgames Member
  truefriends: Ciao :-)

But that's about all my Italian ;-)

Dec-13-14
Premium Chessgames Member
  hoodrobin: I do not even know a word of Dutch but I'm very fond of (at least) two Dutch <products>, namely V. van Gogh and Philips (electronics).
Dec-14-14
Premium Chessgames Member
  truefriends: And I like almost everything out of your kitchen... even a simple pizza ;-)
Dec-14-14
Premium Chessgames Member
  hoodrobin: Yes a pizza is a simple device, as simple as a board of 8x8 squares. But the possible combinations of flavors is almost infinite! ;-)
Dec-15-14
Premium Chessgames Member
  hoodrobin: BTW do you know this one?

https://www.youtube.com/watch?v=TN6...

Dec-16-14
Premium Chessgames Member
  cro777: Hi <truefriends>

Can White still win this? Probably not...


click for larger view

This position is a theoretical draw. Black has to play ...Kf4. (Of course, after ...Kd4 or ...Kf6 Black is lost).

The main line is:

1...Kf4 2.Kd3 Rd1+ 3.Kc4 Kg5

Dec-17-14
Premium Chessgames Member
  truefriends: I know... I already offered a draw in that game and my opponent agreed ;-)
Dec-17-14
Premium Chessgames Member
  truefriends: If you have 2 simular engines, let's call them A and B.

Engine A is sligthly stronger than engine B, but only supports 1 core. Engine B supports multiple cores.

If you have multiple cores (let's say 2)... Which engine produces the most accurate analysis in the same amount of time?

Dec-17-14
Premium Chessgames Member
  MuzioFan: My guess would be the engine that supports multiple cores - running on 2 cores instead of 1 really does mean a speedup of almost 100%, which should outweigh the slight difference in strength. But important is that this is true only if the test of strength was done on a single core for both engines - if somebody else has tested the performance of engine A on one core against engine B on two cores and found A stronger then of course that answers your question.

So: if the strength was tested on as many cores as possible then engine A, if it was tested on a single core then engine B.

P.S.: You asked for advice from spacebar masters, which I am far from. But I hope that they agree with what I have written above.

Dec-17-14
Premium Chessgames Member
  truefriends: < MuzioFan: My guess would be the engine that supports multiple cores - running on 2 cores instead of 1 really does mean a speedup of almost 100%, which should outweigh the slight difference in strength.>

I did a little test an the speedup is about 50%...

Dec-17-14
Premium Chessgames Member
  AylerKupp: <truefriends> I am no spacebar master either but it is difficult to answer your question without some questions of my own.:

1. What do you mean when you say that engine A is slightly stronger than engine B? That in an engine vs. engine competition engine A has a slightly higher winning percentage in a statistically significant number of games? And I would assume that if this is the case, this determination was done with engine A running on one core and engine B running on two cores, and that they are running on identical hardware.

2. What do you mean by the most accurate results? That one engine's evaluation of a statistically significant number of positions is more accurate than the other engine's? And how would you determine that the results are more accurate?

I elaborated in The World vs Naiditsch, 2014 that there is a difference between relative and absolute evaluations. There I indicated that to play a strong game it is only necessary that an engine produce accurate <relative> evaluations, but that for the type of analyses that we need in a game like the current game against GM Naiditsch we need an engine that produces accurate <absolute> evaluations in order to make correct voting decisions. But if engine A is considered to be stronger than engine B, that was probably the result of engine vs. engine competitions so engine A need not generate accurate <absolute> evaluations at all.

It is also difficult to determine how accurate an <absolute> evaluation is because the only judges we have are top-level human grandmasters (a different engine would not be of any use because we don't know how accurate its evaluations are, etc.). But human grandmasters don't think in terms of "equivalent centipawns" and, if they did, I doubt that their "resolution" would be better than 0.50 or so (half a pawn). So, if a an engine's evaluations <consistently> differ significantly from the evaluation of a top level grandmaster by a somewhat large amount (say more than one pawn), then that engine's evaluations can be considered to be somewhat inaccurate. But if the evaluations of 2 engines differ by less than 0.50 (assuming that my assumption about a grandmaster's effective evaluation resolution is correct), then a top-level human grandmaster could not determine which of the 2 engines produce the more accurate evaluation). At, at any rate, you would probably need a team of top-level grandmasters rather than just one to have confidence in the human evaluation.

The above is a very round about way of saying, as is usual for me, that I don't know how to answer your question. But I did want to point out that very often an engine running on one core is stronger than an engine running on 4 cores, as the engine ratings in, say, the CCRL engine tournaments indicate. See for example http://computerchess.org.uk/ccrl/40..., Complete list (Dec-14-14), where single-core 64-bit Komodo 8 and Stockfish 5 were ranked in 3rd place with ratings of 3221 and 3205 respectively while Gull 3.0 4CPU 64-bit was ranked in 4th place with a rating of 3189 along with Houdini 4 single-core 64-bit with a rating of 3187. 4CPU 64bit Komodo 8 was ranked #1 with a rating of 3303 and 4CPU 64-bit Stockfish 5 was ranked #2 with a rating of 3283, indicating that quadrupling the number of cores does not increase rating points all that much (about 80 Elo rating points), at least for these 2 engines, although this rating differential amounts to a P(Win) of about 61% which I consider significant.

Dec-17-14
Premium Chessgames Member
  truefriends: < AylerKupp: <truefriends> I am no spacebar master either but it is difficult to answer your question without some questions of my own.:

1. What do you mean when you say that engine A is slightly stronger than engine B? That in an engine vs. engine competition engine A has a slightly higher winning percentage in a statistically significant number of games? And I would assume that if this is the case, this determination was done with engine A running on one core and engine B running on two cores, and that they are running on identical hardware.>

Just to keep it simple.

Let's asume engine A is a later version of engine B with just a few improvements.

So all other variables are exactly the same, including the hardware used.

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