Author: leonid
Date: 04:59:38 01/20/01
Go up one level in this thread
On January 19, 2001 at 20:36:22, Heiner Marxen wrote: >On January 19, 2001 at 19:44:02, leonid wrote: > >>On January 19, 2001 at 17:54:10, Heiner Marxen wrote: >>> >>>Since increasing depth seems to help me as compared to you, >>>I suspect much of it is caused by the TT. My hit rate is not large, >>>8.6% normal hits and 18.2% hits for ETC (enhanced transposition cutoffs). >>>But with some depth left to go that can have quite an effect. >> >>Heiner, please don't use with me abreviation! I just don't know what it is TT. >>If you will write something in German, or even in Chinese - never mind! I have >>all dictionaries in my room to help me. I have no chance with abreviations. Only >>few I learned already by heart. > >I am sorry! Of course I should have explained that abbreviation, also. > >TT = "transposition table", also known as "hash table". >Transposition table is the more "official" name found in books and articles, >and hash table is more often used in speech and discussions. >(That is my impression, anyhow). >Hash table is not as precise as transposition table, since a transposition >table might be implemented differently (i.e. not as a hash table... >yes, I have tried that), and hash tables can be used for other purposes than a >transposition table. > > >>>To measure the effect of good move ordering, I would have to replace it >>>with another one, and re-run. I'm too lazy for this just now. >>>I suspect that you will at least also prefer check moves and captures, >>>so for this special problem we may do comparatively equal: white has >>>left quite some pieces to be agressive in that simple way. >>> >>>BTW, here are my branching factors inside the "no mate in 8": >>>mvx 8: 87 87 [ 87.000 1.000] 1 >>>mvx 7: 438 533 [ 5.034 1.217] >>>mvx 6: 1713 2259 [ 3.214 1.319] 1 >>>mvx 5: 7444 9227 [ 3.295 1.240] 154 4 >>>mvx 4: 70334 74945 [ 7.623 1.066] 2052 5 >>>mvx 3: 1469915 1314821 [ 19.613 0.894] >>>mvx 2: 33639291 23346271 [ 25.585 0.694] >>>mvx 1: 4117503 0 [ 0.176 ] >>> >>>Just implement your TT. You will love the effect! >> >>If TT have something to do with hash table then I expect to come to this sonner >>or later. Mainly when complet rewriting for Linux will start. I dream already to >>start my new system writing! But probably I must wait up to the end of Summer. > >Yes, you guessed right, I mean the hash table. > >>Today went reading about new 64 bits chip. Could never understand if this >>Intel's chip already came, or close to be produced but it give wonderful >>impression! 128 new 64 bits registers to play with. When finally it will be no >>more rumor but real chip for all of us!!!! > >Although I have not done anything related to assembly or machine language >since 10 years, I still remember the good feeling to be able to play with >just every bit that is there, and to control just every nanosecond ;-) > >Sorry again, Leonid, and have a nice day! > >Heiner Thanks very much for explantion, Heiner! Have a good week-end! Leonid.
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