Author: Uri Blass
Date: 23:44:40 01/31/02
Go up one level in this thread
On February 01, 2002 at 00:28:08, Robert Hyatt wrote: >On January 31, 2002 at 14:04:13, Andrew Dados wrote: > >> >> >>From their own publication, 'Deep Blue', June 2001 >>Example of search depths over one position >>r1r1q1k1/6p1/3b1p1p/1p1PpP2/1Pp5/2P4P/R1B2QP1/R5K1 w >>from DB-Kasparow game 2 from 1997, before move 37 >> >>When chips were set to minimum fullwith 4 plys: >> >>A.Iteration >>B.Minimum software depth >>C.Maximum software depth >>D.Maximum Estimated combined depth >> >>A B C D >>---------------- >>6 2 5 11-21 >>7 3 6 12-22 >>8 4 11 17-27 >>9 5 15 21-31 >>10 6 17 23-33 >>11 7 20 26-36 >>12 8 23 29-39 >> >>So iteration is clearly the sum of minimum software depth (B) and hardware depth >>(4 plys here). >> >>-Andrew- > > > >OK... but what does this have to do with the current discussion? DB doesn't >report "an iteration number". It reports things like 10(6) and directly >according to Hsu (from the email I posted) 10 is the software depth, and (6) >is the hardware depth. They are _added_ to get the total depth... I also do not understand the fixed depth of the hardware of 4 plies but it is clear thank to previous post of andrew Dados that 18 plies is impossible. He gave discussion from rgcc when one(david fotland if I remember correctly) said in march 1997 that deeper blue team decided not to search 14 plies brute force but search only 11-12 plies because they wanted to do more extensions Nobody corrected him at that time and I see no publication when hsu says that 12(6) means 18 plies brute force. Here is the logfile from the game and I do not see hint for a fixed depth of 4 plies for hardware from it --> 36. axb5 <-- 4/40:28 --------------------------------------- hash guess Pa6b5p,Guessing axb5 8(4) #[Qb6](30)[Qb6](30) 30^ T=1 qf2b6 Ra8a2r ra1a2R Bd6c7 qb6e6 Kg8h8 bc2e4 Rc8b8 ra2a6 Qe8d8 pd5d6 Bc7b6 8(6) #[Qb6](53)#################################### 53 T=4 qf2b6 Ra8a2r ra1a2R Bd6c7 qb6e6 Kg8h8 bc2e4 Rc8b8 ra2a6 Qe8d8 pd5d6 Bc7b6 9(6) #[Qb6](53)#################################### 53 T=9 qf2b6 Ra8a2r ra1a2R Bd6c7 qb6e6 Kg8h8 bc2e4 Rc8a8 kg1h2 Ra8b8 pg2g3 Qe8f8 10(6) #[Qb6](55)#################################### 55 T=33 qf2b6 Ra8a2r ra1a2R Bd6c7 qb6e6 Kg8h8 bc2e4 Qe8f8 kg1h1 Bc7d6 ra2a6 Rc8d8 ra6a7 11(6)<ch> 'ab' #[Qb6](32)########[Be4](37)############################ 37 T=182 bc2e4 Rc8b8 pg2g3 Qe8d8 ra2a6 Ra8a6r ra1a6R Bd6c7 ra6f6P 12(6)[TIMEOUT] 37 T=199 bc2e4 Rc8b8 pg2g3 Qe8d8 kg1g2 Ra8a2r ra1a2R Bd6c7 qf2a7 Bc7b6 qa7a6 Qd8d7 --------------------------------------- --> 37. Be4 <-- 3/37:56 Uri
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