Author: Russell Reagan
Date: 12:55:10 11/06/03
In this thread: http://www.chess-archive.com/ccc.php?art_id=310212 Gian-Carlo Pascutto reported that his program, Deep Sjeng (compiled for 64-bit hardware), ran 70% faster on an Opteron, clock for clock. As far as I know, Deep Sjeng is not bitboard based. In this thread: http://www.talkchess.com/forums/1/message.html?325912 Eugene Nalimov reports that Crafy (compiled for 64-bit hardware) gets 1,761,569 nps on a 1.8GHz Opteron. On my 2GHz Athlon, Crafty gets 1,230,931 nps. (2.0 / 1.8) x 1,761,569 = about 1,957,298 nps on a 2GHz Opteron So, clock for clock, Crafty is 1,957,298 / 1,230,931 = 1.59 times faster (60%) on an Opteron, while Deep Sjeng was 70% faster. I suspect Eugene was using his magic unreleased compiler also, which probably produces faster executables than gcc. But that is speculation. So either Deep Sjeng is bitboard based, or the expected advantage that bitboard engines were going to get that non-bitboard engines were not going to get does not exist. Or I'm overlooking something else. Thoughts?
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