Author: Robert Hyatt
Date: 07:29:26 10/29/01
Go up one level in this thread
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... >>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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