Author: Robert Hyatt
Date: 20:13:27 10/11/02
Go up one level in this thread
On October 10, 2002 at 16:37:32, Jeremiah Penery wrote: >On October 10, 2002 at 12:03:08, Gian-Carlo Pascutto wrote: > >>On October 10, 2002 at 07:05:49, Jeremiah Penery wrote: >> >>If you use null-move R=3, your minimum software depth for iteration i will be >at least i-3. Does this mean I can say you're searching 9 ply when you report >12 plies of output? >> >>They didn't nullmove, so this does not apply. Their minimal depth was >>their nominal depth. > >In Chessmaster, you can sometimes see depths of 1/12 or something. Supposedly, >the 1 is something akin to the 'minimum software depth', where 12 is the >'minimum extension depth' (whatever that means). Do you say Chessmaster gets a >nominal depth of 1 ply in that case? > >Here is an example lifted from another thread: > >Time Depth Score Positions Moves >0:22 1/10 0.18 2019899 1...Bg7 2.Nd5 Nb4 3.Nxb4 cxb4 4.Re1 > Kb8 5.c5 f6 6.exf6 Bxf6 7.cxb6 >0:28 1/10 0.02 2616465 1...Nb4 2.Rc1 Bg7 3.a3 Nd3+ 4.Bxd3 > Rxd3 5.Ke2 Rdd8 6.Rhd1 Kb7 7.Kf3 > Rhe8 >0:44 2/11 0.05 4009153 1...Nb4 2.Rc1 Bg7 3.a3 Nd3+ 4.Bxd3 > Rxd3 5.Ke2 Rdd8 6.Nd5 Bxd5 7.cxd5 > Rxd5 8.Rhd1 Rhd8 9.Rxd5 Rxd5 >1:37 3/12 -0.02 9618144 1...Nb4 2.Rc1 Bg7 3.a3 Nd3+ 4.Bxd3 > Rxd3 5.Ke2 Rdd8 6.Rhd1 f6 7.exf6 > Bxf6 8.Nd5 Bg7 >4:36 4/13 -0.19 29219198 1...Nb4 2.Rc1 Bg7 3.a3 Nd3+ 4.Bxd3 > Rxd3 5.Rhd1 Rxd1 6.Rxd1 f6 7.exf6 > Bxf6 8.Nd5 Rd8 9.Ke2 > >The point is, you can't easily compare depths of programs where you don't know >EXACTLY what they are doing. Searching to depth 10 in Chessmaster and Fritz >will give a huge disparity in results, because their searches are nothing alike. > The same goes for DB and Fritz. This is why I believe you can't compare >reported search depths between programs (I can again use Junior as an example) >and say that one 'outsearches' the other by some margin of plies. Of course that is correct. But it isn't going to stop the "comparisons" so it is going to be a "correct but moot point". :) The DB haters will _remain_ DB haters and take pot shots at every opportunity. Not much can be done. Perhaps DB will return at some point and the debate can be replaced by real results...
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