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=KRPKR=
<span id="KRPKR"></span>While most programs rely on [[Endgame Tablebases|endgame tablebases]] , in [[https://en.wikipedia.org/wiki/Rook_and_pawn_versus_rook_endgame rook and pawn versus rook endgame], two type of positions are of particular interest whose basic features may be considered with some pattern matching to adjust the score accordantly. The [[Lucena Position|Lucena position]], finally "building the bridge" is a win for the pawn side, and the [[Philidor Position|Philidor position]] is a draw. Most rook and pawn versus rook endgames reach either the Lucena or the Philidor position if played accurately <ref>[https://en.wikipedia.org/wiki/Jes%C3%BAs_de_la_Villa Jesús de la Villa] ('''2008'''). ''100 Endgames You Must Know: Vital Lessons for Every Chess Player''. [https://en.wikipedia.org/wiki/New_in_Chess New in Chess]</ref>.
* [[Lucena Position]]
* [[Philidor Position]]
* [https://en.wikipedia.org/wiki/Grigory_Levenfish Grigory Levenfish], [https://en.wikipedia.org/wiki/Vasily_Smyslov Vasily Smyslov] ('''1971, 1989'''). ''[http://books.google.com/books/about/Rook_endings.html?id=IlgYAQAAMAAJ&redir_esc=y Rook Endings]''. [https://en.wikipedia.org/wiki/Anova_Books Batsford]
* [[Coen Zuidema]] ('''1974'''). ''Chess: How to Program the Exceptions?'' Technical Report IW21/74, Department of Informatics, [https://en.wikipedia.org/wiki/Centrum_Wiskunde_%26_Informatica Mathematical Center Amdsterdam]. [http://oai.cwi.nl/oai/asset/9480/9480A.pdf pdf]
* [[Vladimir Arlazarov]], [[Aaron L. Futer]] ('''1979'''). ''Computer Analysis of a Rook End-Game''. [http://www.doc.ic.ac.uk/~shm/MI/mi9.html Machine Intelligence 9] (eds. [[Jean Hayes Michie]], [[Donald Michie]] and L.I. Mikulich), Ellis Horwood, Chichester. Reprinted in [[Computer Chess Compendium]]
* [[Ken Thompson]] ('''1990'''). ''KQPKQ and KRPKR Endings''. [[ICGA Journal#13_4|ICCA Journal, Vol. 13, No. 4]]
* [[John Nunn]] ('''1992'''). ''Secrets of Rook Endings''. [https://en.wikipedia.org/wiki/Anova_Books Batsford], [http://www.newinchess.com/Secrets_of_Rook_Endings-p-511.html 2nd edition] ('''1999'''). [https://en.wikipedia.org/wiki/Gambit_Publications Gambit] <ref>[[Jaap van den Herik]], [[Bob Herschberg]]. ('''1993'''). ''J. Nunn: Secrets of Rook Endings''. [[ICGA Journal#16_2|ICCA Journal, Vol. 16, No. 2]]</ref>
