Author: Chrilly Donninger
Date: 06:19:53 12/12/05
Go up one level in this thread
On December 12, 2005 at 09:05:22, Alessandro Scotti wrote:
>On December 12, 2005 at 07:18:32, Chrilly Donninger wrote:
>
>>The code from where I know that Rybka uses PVS:
>>
>>.text:0040D156 call sub_40D1B0
>>.text:0040D15B mov esi, eax
>>.text:0040D15D lea eax, [esp+278h+var_238]
>>.text:0040D161 push eax
>>.text:0040D162 push edi
>>.text:0040D163 neg esi
>>.text:0040D165 call sub_40A780
>>.text:0040D16A add esp, 18h
>>.text:0040D16D cmp esi, [esp+268h+var_25C]
>>.text:0040D171 jle short loc_40D183
>>.text:0040D173 cmp esi, ebx
>>.text:0040D175 mov [esp+268h+var_25C], esi
>>.text:0040D179 jle short loc_40D183
>>.text:0040D17B cmp esi, [ebp+arg_4]
>>.text:0040D17E mov [ebp+arg_0], esi
>>.text:0040D181 jge short loc_40D13A
>
>Hi Chrilly,
>this part doesn't look much PVS'ish...
In Pseudo-C it is:
val=-QuiescenceSearch()
UndoMove()
if(val>BestVal) { BestVal=val; }
if(val>Alpha) { Alpha=val; }
if(val>Beta) { return val; }
You are right. It looks more than plain ALpha-Beta than PVS. My main point was:
Its not MTD(). In a Null-Window-Search Updating of Alpha makes no sense. Also
one paramter sufficies (either Alpha or Beta, but not both).
Chrilly
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