Author: Robert Hyatt
Date: 10:17:45 10/11/04
Go up one level in this thread
On October 11, 2004 at 08:53:30, Rick Bischoff wrote: >Hello, > >I have been trying to get my move ordering right, and am running into the >following anomalies-- was wondering if your engine has the same rates; >basically, if the score is above alpha (even if it is above beta), I increment a >counter for the type of move. > >I currently count hash moves, winning captures, =captures, losing captures, >killers, history and everything else. > >I ran the full WAC test at a fixed depth of 6 and the following happens; > >for every position: > >hash cutoffs are around 15-40% >winning captures are around 40-73% >even captures are ALWAYS 0% (but I still have some, just not enough to be >= 1%) >losing captures are around 10% >killers are around 1% >history are around 0% >and other are 3% > >I *must* have a bug-- it makes sense to me that hash cutoffs should be much >bigger than winning captures shoud be much bigger than even captures should be >bigger than losing captures, etc. > >One scenario that I could think of was that the search kept changing its mind >during the next iteration, but surely this shouldn't happen enough to account >for the large difference. > >From the opening position with a fixed depth of 8 with material only eval: > >1,197,470 nodes >242162 cutoffs >9% hash (23260) >34% winning captures (82780) >0% even captures (61) >22% losing captures (54077) >31% killers (75561) >0% history (71) >2% other (6352) > >with full eval: > >1,492,098 nodes >295234 cutoffs >8% hash (25776) >37% winning captures (111206) >0% even captures (109) >24% losing captures (70898) >25% killers (76224) >0% history (290) >3% other (10731) I don't see anything strange in your numbers. Winning captures will always be at the top, since a full-width search drops pieces everywhere and the best refutation is to simply take the piece. losing captures seems odd but I haven't given it much thought. Killers looks reasonable. Hash will always be low as there are so few hash hits where the entry has a best move...
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