Author: Ed Schröder
Date: 02:54:28 01/02/98
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>Posted by Ernst Walet on January 01, 1998 at 16:58:25: >I have analyzed the end position of the second game of the rematch >between Kasparov and Deep Blue with Rebel9 and had some strange results. >When i use power analyze on Qb6xc6 and Qb6-e3 separately it gives the >following score on the PV: >PLY Qb6xc6 Qb6-e3 >10 -0.82 -2.34 >11 -1.00 -1.76 >12 -1.23 -1.52 >13 -1.37 -1.41 >14 -1.38 -1.18 >15 -1.56 -1.76 >When i use power analyze on Qb6xc6 and Qb6-e3 together it gives the >following score on the PV: >PLY move >10 Qb6xc6 -0.81 >11 Qb6xc6 -1.00 >12 Qb6xc6 -1.23 >13 Qb6xc6 -1.37 >14 Qb6xc6 -1.43 >15 Didn't wait because i expected it to switch PV on ply 14 >With normal analyze it swiches from Qb6xc6, score -1.56 to Qb6-e3,score >-1.53 on the 15th ply. >Why not the same score and ply depth switching between these two moves? >has it to do with hash-tables? Your guess is right. Besides transpositions the hash table is also used to guide the search. Whenever you change the "move order" of a search this may cause different moves and/or scores. Not much but still... This is even true if you only make some minor changes to the move generator to improve sorting or so. Result: other moves, other scores. However no big differences. - Ed - >beste regards, Ernst.
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