Author: Severi Salminen
Date: 03:44:05 12/21/01
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>1. this one only consider the first move cufoff, which can be a problem, for >example, if I have a great hashtable, and so hastable move will be searched >first. any improvement i made in other part of move ordering will not be >refelected in here. That's true. It is hard to say which is better, a program that fails high 90% of first moves and 20% second, or another which fails high 80% on the first and 60% on the second move. But the first figure gives a good estimate. A lot better way is to check the number of nodes: if it decreases, the ordering has improved. >2. seems to me this is bias to use SEE, or any other techniques that will pick >the first move in case the hashmove doesnot exist. It will not help for any >other techniques, such as >a. quality of your history table. >b. second killer move >c. killer move in 2 plies above >d. capture last moved piece, etc. > >while these techniques will certainly help the move ordering, it will not >increase the percentage much, if at all. Check the nodes, it will tell more. >2. the cost, how much more calculation you want to spend here, will these extra >calculations slow down your program too much? > >For myself, i had some cases where i increase this number by a few percent >without slowdown the program, but still, the new version lost the matchs against >old versions. I wouldn't rely on test games on this kind of things. Usually many improvements (such as a small improvement on move ordering) will show difference in strenght only after thousands of games. I'd rely on instincts (and a few test position...). >I was thinking this is almost like the mobility, while good program trend to >have higher number, maximize it will not necessary result a better program. Well, better move ordering allways is better (counting the speed of it, of course), but better mobility is not necessarely. Severi
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