Author: Dann Corbit
Date: 10:17:28 02/23/00
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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. 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?
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