Author: Ed Schröder
Date: 12:36:12 11/09/98
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>Machine is a K6-233 in Dos mode and 60 MB hash. >Combination is off and all else at default (the default mode for Rebel 10 when >playing games). >Initially it plays g5 (2:37) but without the correct followup in the eval, >namely d4. However it finds >d4 (4:47 - 15th ply) when that position is reached. >These are from the game Kotov Vs Botvinnik: >8/8/4b1p1/2Bp3p/5P1P/1pK1Pk2/8/8 b - - id end08 - Ecm98; bm g5; >8/8/4b3/2Bp2Pp/7P/1pK1Pk2/8/8 b - - id end09 - Ecm98; bm d4; >One puzzling thing is that I double checked these positions in Windows95 mode >with 28 MB hash. The d4 move was not found in the 15th or 16th ply. I thought it >was due to Windows but it turns out that the 60 Mb vs 28 Mb of hash somehow >makes a difference. Yes, this can happen. In fact it happens a lot especially in end-games. Rebel (since Rebel8) uses the hash table also for other things. The rule is the more memory for hash tables the better Rebel will play. So your observation is a correct one. On the other don't be too surprised if you occasionally see these things happen the other way around as I have seen the exceptional examples Rebel playing the good move with 28 Mb and not with 60 Mb. It's not uncommon just a negative side effect of a good algorithm. As long as they remain exceptions I can live with it. - Ed - >Why is this ? Does hash size effect the eval even when the hash is not filled >up?
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