Author: Robert Hyatt
Date: 18:06:11 10/28/01
Go up one level in this thread
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... 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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