Author: William Penn
Date: 11:52:28 12/11/00
The signs of scores are confused in CM8000. Previously it was confirmed there is a problem with omitting the minus sign when the score number is in the range of -0.01 to -0.99. Now, here is an example of the signs being wrong when the score number is larger than 1.00. BR -- -- BQ BK -- BN BR -- BP BP BB -- -- -- -- -- BB -- -- BP BP -- BP BP WP -- BP WP -- BP -- WP -- -- WP -- -- -- WN -- WN WP WB -- -- -- WP -- -- -- -- -- WP WP -- WR -- WB WQ WR -- WK -- White: a custom personality Black: human Black to move if Chessmaster box checked in Thinking Lines window Time Depth Score Positions Moves 0:07 7 5.25 210887 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Qc2 0:27 8 5.01 716123 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Qd2 1:11 9 5.46 2169809 h5 Ng6 Rh6 Bxg5 fxg5 Qf3 Bxb5 Bxb5+ ... 3:46 10 5.71 7208736 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 h4 ... 21:56 11 6.15 42116395 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Nf3 ... if White box checked in Thinking Lines window Time Depth Score Positions Moves 0:04 7 -5.25 210887 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Qc2 0:13 8 -5.01 716123 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Qd2 0:35 9 -5.46 2169809 h5 Ng6 Rh6 Bxg5 fxg5 Qf3 Bxb5 Bxb5+ ... 1:52 10 -5.71 7208736 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 h4 ... 10:49 11 -6.15 42116395 h5 Ng6 Rh7 exf6 Qxf6 Ne5 Rh6 Nf3 ... Everything is the same in these two charts except the signs of the scores and the times. That's because the custom personality is identical to Chessmaster, just with a different name. The first chart takes twice as much time because another engine was running in the background, unknown to me (inadvertently, i.e. that's another major problem with CM8000!?). Although it would be possible to define a special protocol to make these results acceptable, that would complicate things unnecessarily, and will cause mass confusion because it departs from what almost everyone expects. Again, the standard protocol is that the score is positive when white has an advantage, and is negative when black has an advantage -- independent of who has the move. It should also be independent of which box(es) is checked in the Thinking Lines window! Obviously white is winning in this position, so the signs of the scores should be positive in all cases. WP
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.