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'''[[Main Page|Home]] * [[Evaluation]] * [[Game Phases]] * [[Endgame]] * Mop-up Evaluation'''
'''Mop-up Evaluation''' might be applied at decided late endgame positions without any [[Pawn|pawns]], where one side has a winning advantage to [[Checkmate|checkmate]] and likely a [[Rook|rook]] or [[Queen|queen]] (or even two different colored [[Bishop|bishops]]). The winning side wants to drive the losing [[King|king]] to the edges and corners, and has therefor a bonus for [[Center Distance|Center distance]] ([[Center Manhattan-Distance|Center Manhattan-distance]]) of the losing king, and a bonus for a minimum distance of both kings. In practice one often uses some term based on the (weighted) sum of the [[Distance|Chebyshev distance]] and the [[Manhattan-Distance|Manhattan distance]], to have a higher bonus for the corners and straight rather than diagonal [[Opposition|opposition]].
=Chess 4.x=
For instance, [[Chess (Program)|Chess 4.x]] Mop-up evaluation was based on sum of absolute [[Ranks#RankDistance|rank-]] and [[Files#FileDistance|file-distances]] <ref>[[David Slate]], [[Larry Atkin]] ('''1977'''). ''CHESS 4.5 - The Northwestern University Chess Program.'' [[Chess Skill in Man and Machine]], reprinted ('''1988''') in [[Computer Chess Compendium]]</ref>, something like this (ignoring knights, which were equally considered like the king) from the stronger side of view:
<span style="font-size: 140%;">PosEval = 4.7 * CMD + 1.6 * (14 - MD)</span>
CMD is the Center Manhattan distance of the losing king and MD the Manhattan distance between both kings. Of course part of such terms might be covered by [[Piece-Square Tables|piece-square tables]] of that very late game stage, and most of these positions are handled by [[Interior Node Recognizer|interior node recognizer]] nowadays.
=See also=
* [[Center Distance]]
* [[Center Manhattan-Distance]]
* [[KBNK Endgame]]
* [[KRK]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=62257 Simple method for simple mates for programs without TBs] by [[J. Wesley Cleveland]], [[CCC]], November 25, 2016 ยป [[Center Manhattan-Distance]], [[KBNK Endgame]]
=References=
<references />
'''[[Endgame|Up one Level]]'''
