Author: Tony Werten
Date: 07:43:35 10/29/01
Go up one level in this thread
On October 29, 2001 at 10:29:26, Robert Hyatt wrote: >On October 29, 2001 at 04:05:08, Tony Werten wrote: > >>On October 28, 2001 at 21:06:11, Robert Hyatt wrote: >> >>>On October 28, 2001 at 18:20:43, Bas Hamstra wrote: >>> >>>>Again many bizar events. While discussing how boring and anti-positional Tiger >>>>usually plays, with Jeroen Noomen, during the game Tao-CT, CT shot a h-pawn >>>>through Tao's left eye. End of discussion. Well, let's call the thing an >>>>idiot-savant, that's as far as I can go. Newcomer is EEC that does not use any >>>>form of AlphaBeta at all. The author tried to explain the concept to me, but I'm >>>>not sure I understand. Each move it plays a couple of shallow "matches" against >>>>itsself and some kind of pattern matching is involved. Eventually that leads to >>>>"votes" for different moves. The author says it has won some Blitz games against >>>>GNU. >>>> >>>>Also new is "Gadget" from Hans Zijdenbos, written in Basic. Since it is brand >>>>new, it has many things *not*. It has no hashtable, no pondering, no nullmove >>>>and believe it or not, no quiescence search. Very little evaluation. Now can >>>>that play chess? Amazingly, it does. Imagine Gadget searching 6-7 ply and Tao >>>>12-13 ply, basically twice as deep. Yet it kept Tao negative for over twenty >>>>moves, with sound play. Cock de Gorter said the same happened during >>>>Crafty-Gadget. You would almost expect non nullmovers find positional holes in >>>>the nullmove search or something. >>>> >>>>During a deep technical discussion with Johan de Koning whether to analyze mates >>>>and countermates in the evaluation function or not, Jeroen Noomen drops by: >>>>"aha, a rabbit". Apparently an enemy knight at h7, that can't move, is a rabbit. >>>>We didn't get it, what do rabbits usually do? We could think of two things: a) >>>>multiply and b) disappear in a hole. Since there were no minor promotions >>>>possible in the foreseeable future and the rabbit finally disappeared in h7 I >>>>wouldn't be surprised if b) has something to do with it. >>>> >>>>Well, Tao scored 3 out of 6 so far, on a PIII-500. Should have won against Ant, >>>>which was positionally manoevred into a corner quite nicely, but alas, fell into >>>>the "impotent pair" trap which I have no code for: bishop+unpromotable pawn, and >>>>it became a draw. >>>> >>>>Finally: what's the matter with Crafty? It has the fastest hardware of all, but >>>>seems to do relatively poorly, what's the matter? The new SE stuff, or what? >>>> >>>>TooTheLoo, >>>>Bas. >>> >>>1. Does Crafty _really_ have the fastest hardware there? That's hard to >>>believe with lots of 1.4 gig Dual AMD machines cheaply available. But in any >>>case, it is possible. A dual 1.4 is faster than a quad-700 for Crafty, however, >>>as the quad loses a bit more to overhead... >> >>Crafty doesn't have the fastest hardware but it's still quite fast. In the >>endgame Crafty - XiniX I was outsearching Crafty several times by 3 to 5 ply on >>a celeron 700 ! Unfortunately it wasn't enough to win, but it does seem to >>indicate something is wrong in Crafty's endgame. XiniX had no problem searching >>the same depth. >> >>Tony >> >>> > > >I don't think the bug shows up like that. If there is a bug at all. Are you >using the 3-4-5 piece EGTBs? That definitely affects the search speed. >Otherwise, no ideas here... Yes. I probe 3-4-5 tables from disk in the search (not in quiescence ) XiniX was not faster than Crafty in nps (but 4 times slower). In the positions the branchingfactor is so small that 20 plies should not be a problem. Tony > > > >>>2. Crafty may well have a serious bug. Michel has reported that it will crash >>>on a deep think, which is odd. There is no SE code in it, but it is possible >>>that something in recent versions has left a bad array subscript or something. >>>I am trying to get it to repeat a crash, but so far, nothing... >>> >>> y
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