Author: Mark Young
Date: 17:19:36 02/23/00
Go up one level in this thread
On February 23, 2000 at 13:17:28, Dann Corbit wrote: >On February 23, 2000 at 10:37:07, Mark Young wrote: > >>On February 22, 2000 at 23:23:40, Dann Corbit wrote: >> >>>On February 22, 2000 at 22:42:37, Mark Young wrote: >>>[snip] >>>>1...b3-b2+! >>>> -+ (-2.59) Depth: 25/50 01:55:10 2426474kN, tb=95806 >>> >>>Interesting that the right move is chosen, but the eval is going more and more >>>negative all the time. Is the test problem actually wrong? Is there a defense? >> >>-+(standard chess notation) means Black stands much better, - scores are good >>for black in chessbase, + scores are good for white. Dan take your head out of your computer. This has nothing to do with PGN anything. > >It's non-standard and incorrect. The PGN Standard by Steven J. Edwards says >that centipawn evaluations are integers with the following constraints: > >"Values are restricted to integers that are equal to or greater than -32767 and >are less than or equal to 32766. > >A value greater than 32000 indicates the availability of a forced mate to the >active player. The number of plies until mate is given by subtracting the >evaluation from the value 32767. Thus, a winning mate in N fullmoves is a mate >in ((2 * N) - 1) halfmoves (or ply) and has a corresponding centipawn >evaluation of (32767 - ((2 * N) - 1)). For example, a mate on the move (mate >in one) has a centipawn evaluation of 32766 while a mate in five has a >centipawn evaluation of 32758. > >A value less than -32000 indicates the availability of a forced mate to the >passive player. The number of plies until mate is given by subtracting the >evaluation from the value -32767 and then negating the result. Thus, a losing >mate in N fullmoves is a mate in (2 * N) halfmoves (or ply) and has a >corresponding centipawn evaluation of (-32767 + (2 * N)). For example, a mate >after the move (losing mate in one) has a centipawn evaluation of -32765 while >a losing mate in five has a centipawn evaluation of -32757. > >A value of -32767 indicates an illegal position. A stalemate position has a >centipawn evaluation of zero as does a position drawn due to insufficient >mating material. Any other position known to be a certain forced draw also has >a centipawn evaluation of zero." > >What standard states that negative values indicate black has an advantage?
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.