25,161
edits
Changes
Created page with "'''Home * Evaluation * Game Phases * Endgame * King Pawn Tropism''' '''King Pawn Tropism''', an endgame evaluation feature concerning the Distance..."
'''[[Main Page|Home]] * [[Evaluation]] * [[Game Phases]] * [[Endgame]] * King Pawn Tropism'''
'''King Pawn Tropism''',
an endgame evaluation feature concerning the [[Distance|distance]] of a [[King|king]] to [[Pawn|pawns]], with the motivation to either defend or support own ones, or to attack or block opponent ones - in both cases, the closer the better.
=Implementation=
A common way to implement tropism is to calculate the average [[Manhattan-Distance|Manhattan-distance]] of the king square to all pawn squares, weighted by some factor to consider [[Passed Pawn|passed]] and [[Weak Pawns|weak pawns]] (i.e. 6:3:2 for passers, [[Backward Pawn|backward]] and remaining pawns as applied in [[Bobby]] and also [[Hans-Joachim Kraas|Kraas']] and [[Günther Schrüfer|Schrüfer's]] didactic [[Basic]] program [[Demoschach]], described in ''Das große Computerschachbuch'' <ref>[http://www.rainerbartel.de/ Rainer Bartel], [[Hans-Joachim Kraas]], [[Günther Schrüfer]] ('''1985'''). ''[http://www.c64-wiki.de/index.php/Das_grosse_Computerschachbuch Das große Computerschachbuch]''. [https://en.wikipedia.org/wiki/Data_Becker Data Becker], ISBN 3-89011-117-3 (German), [http://www.amazon.de/Das-gro%C3%9Fe-Computerschachbuch-Rainer-Bartel/dp/3890111173 amazon.de], pp. 258, Verfahren zur Bewertung der Königsaktivität, 2. Mittlerer Abstand zwischen König und Bauern</ref>). Two accumulators are used to aggregate all the Manhattan-distances times weight, and all the weights as well, to finally divide the weighted sum of distances by the number of pawn weights for an average distance
[[FILE:KingPawnTropism.jpg|none|border|text-bottom]]
in the 1..14 Manhattan range, somehow interpreted as penalty for the king side.
=See also=
* [[King Centralization]]
* [[Pawn Endgame]]
* [[Réti Endgame Study]]
* [[Rule of the Square]]
* [[King Safety#KingTropism|King Piece Tropism]]
* [[Unstoppable Passer]]
=External Links=
* [http://en.wiktionary.org/wiki/tropism tropism - Wiktionary]
* [https://en.wikipedia.org/wiki/Tropism Tropism from Wikipedia]
=References=
<references />
'''[[Endgame|Up one Level]]'''
'''King Pawn Tropism''',
an endgame evaluation feature concerning the [[Distance|distance]] of a [[King|king]] to [[Pawn|pawns]], with the motivation to either defend or support own ones, or to attack or block opponent ones - in both cases, the closer the better.
=Implementation=
A common way to implement tropism is to calculate the average [[Manhattan-Distance|Manhattan-distance]] of the king square to all pawn squares, weighted by some factor to consider [[Passed Pawn|passed]] and [[Weak Pawns|weak pawns]] (i.e. 6:3:2 for passers, [[Backward Pawn|backward]] and remaining pawns as applied in [[Bobby]] and also [[Hans-Joachim Kraas|Kraas']] and [[Günther Schrüfer|Schrüfer's]] didactic [[Basic]] program [[Demoschach]], described in ''Das große Computerschachbuch'' <ref>[http://www.rainerbartel.de/ Rainer Bartel], [[Hans-Joachim Kraas]], [[Günther Schrüfer]] ('''1985'''). ''[http://www.c64-wiki.de/index.php/Das_grosse_Computerschachbuch Das große Computerschachbuch]''. [https://en.wikipedia.org/wiki/Data_Becker Data Becker], ISBN 3-89011-117-3 (German), [http://www.amazon.de/Das-gro%C3%9Fe-Computerschachbuch-Rainer-Bartel/dp/3890111173 amazon.de], pp. 258, Verfahren zur Bewertung der Königsaktivität, 2. Mittlerer Abstand zwischen König und Bauern</ref>). Two accumulators are used to aggregate all the Manhattan-distances times weight, and all the weights as well, to finally divide the weighted sum of distances by the number of pawn weights for an average distance
[[FILE:KingPawnTropism.jpg|none|border|text-bottom]]
in the 1..14 Manhattan range, somehow interpreted as penalty for the king side.
=See also=
* [[King Centralization]]
* [[Pawn Endgame]]
* [[Réti Endgame Study]]
* [[Rule of the Square]]
* [[King Safety#KingTropism|King Piece Tropism]]
* [[Unstoppable Passer]]
=External Links=
* [http://en.wiktionary.org/wiki/tropism tropism - Wiktionary]
* [https://en.wikipedia.org/wiki/Tropism Tropism from Wikipedia]
=References=
<references />
'''[[Endgame|Up one Level]]'''
