Author: Vasik Rajlich
Date: 05:46:32 02/28/06
Go up one level in this thread
On February 27, 2006 at 11:51:09, Miguel A. Ballicora wrote: >On February 27, 2006 at 09:41:37, Tord Romstad wrote: > >>On February 27, 2006 at 06:48:18, Tord Romstad wrote: >> >>>I'll try to write an explanation on my web page, and refer to that one >>>in the future. I hope to have it ready today or tomorrow. Stay tuned! >> >>My first draft is ready: >> >>http://www.glaurungchess.com/lmr.html >> >>Comments, corrections and suggested additions or improvements >>are welcome. > >I was away from CC 3 years and I was wondering what this technique was. Thanks >for the explanation, it was pretty clear. >Unfortunately, I tried this ~5 years ago in several ways and it did not work . >It was not my idea, it was Bob Hyatt's here at CCC. I still have in my code this >ancient lines (nodecount is moves searched): > > #if 0 > /* BH's suggestion, modified */ > if (nodecount == 15 && depth == 1) { > break; > } > #endif > > #if 0 > /* BH's suggestion */ > if (nodecount == 15 && depth == 2) { > depth--; > } > #endif > > #if 0 > /* BH's suggestion, modified */ > if (nodecount == 15 && prun_cand ) { > break; > } > #endif > Note that the method Tord describes is quite a bit different. Most important is that the late moves are reduced rather than thrown away - I see now why Tord insisted on that term :) Vas >Considering that after moves 15 the order in my case is determined by history >heuristics, one the options literally was history pruning, and I tried >reductions too. The tree decreased but my engine (gaviota) played terrible. >Maybe I should give it a try again. As you can see, the implementation was too >raw. > >Miguel > >> >>The only two engines I mention in my "Sample Code" paragraph are >>Fruit and Glaurung. This is because of ignorance, and not because >>of disrespect to other authors. If you are the author of an open source >>engine using history pruning (or whatever you prefer to call it) and >>wants it to be mentioned on my page, please let me know. >> >>Tord
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