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'''[[Main Page|Home]] * [[Evaluation]] * [[Game Phases]] * [[Endgame]] * Queen versus Pawn'''
The '''Queen versus Pawn Endgame''' (KQKP) is usually won by the queen side, in particular if the queen can occupy the pawn's [[Pawn Spans|frontspan]].
Even if the pawn is ready to [[Promotions|promote]], supported by its own king, the technique is to come closer with the attacking king, after the defending king was forced to block the [[Promotion Square|promotion square]] due to a queen check.
However, with rook and bishop pawns on the seventh (second) rank, [[stalemate|stalemate]] is looming with the defending king in the corner.
There are even some rare cases with center and knight pawns where the attacking king hinders its own queen to give check <ref>[https://en.wikipedia.org/wiki/Queen_versus_pawn_endgame#Central_pawn_or_knight_pawn Queen versus pawn endgame - Central pawn or knight pawn | Wikipedia]</ref>.
<span id="RookPawn7"></span>
=Rook Pawn on 7th=
The [[Draw|draw]] motive is a [[stalemate|stalemate]] threat, after the defending king blocks its own pawn after a queen check on the neighbouring knight file, so that the attacking king can't come closer.
A [[Distance|Chebyshev Distance]] of at least four to the [[Promotion Square|promotion square]] with a [[Manhattan-Distance|Manhattan distance]] less than eight for the attacking king is necessary to win that game (<span style="background-color: #c0ffc0;">green area below</span>).
While implementing this pattern inside a [[Interior Node Recognizer|interior node recognizer]], one has to take care that with the king in the corner (i.e. black king on a1), the queen has no mate in one (i.e. on c1).
<fentt border="double" style="font-size:24pt">...Q..../....K.../......../(....)..../(.....).../(.....).../(pk...).../(kk...)...</fentt>
<span id="BishopPawn7"></span>
=Bishop Pawn on 7th=
A similar draw motive occurs here with [[stalemate|stalemate]] after the queen captured the bishop pawn.
The winning area of the attacking king requires a bit more calculation.
Critical squares for the [[Distance|Chebyshev Distance]] are the neighbouring square on the same rank on the luff-side (i.e. for black pawn on c2, [[Distance|ϑ(♔,d2)]]),
and the diagonal neighbouring square on the lee-side one rank back (i.e. for black pawn on c2, [[Distance|ϑ(♔,b3)]]).
<ref>[[Interior Node Recognizer]] implemented in [[IsiChess]]</ref>
* With a <span style="background-color: #c0ffc0;">distance below two</span> to any of these critical squares, the game is won.
* A <span style="background-color: #cc80cc;">distance of two</span> to any of these critical squares is required to win the game if the defending king blocks its pawn
* Even a distance of two is not sufficient, if the defending king occupies the corner square (i.e. a1), or the 7th/8th (1st/2nd) rank on the neighbouring knight file (i.e. b1, b2).
<fentt border="double" style="font-size:24pt">...Q..../....K.../......../{....}..../(...){...}../(.+...){.}../(.kp+.){.}../kk{k}(..){.}..</fentt>
=See also=
* [[Draw Evaluation]]
* [[Interior Node Recognizer]]
=Publications=
* [https://en.wikipedia.org/wiki/Reuben_Fine Reuben Fine] ('''1941'''). ''[https://archive.org/details/basicchessending00reub Basic Chess Endings]''. [https://en.wikipedia.org/wiki/George_Bell_%26_Sons Bell & Sons]
* [[Karsten Müller]], [https://en.wikipedia.org/wiki/Frank_Lamprecht Frank Lamprecht] ('''2001'''). ''[http://www.gambitbooks.com/books/Fundamental_Chess_Endings.html Fundamental Chess Endings]''. [https://en.wikipedia.org/wiki/Gambit_Publications Gambit Publications]
* [https://en.wikipedia.org/wiki/Reuben_Fine Reuben Fine], [https://en.wikipedia.org/wiki/Pal_Benko Pal Benko] ('''2003'''). ''[https://en.wikipedia.org/wiki/Basic_Chess_Endings Basic Chess Endings]''. [https://en.wikipedia.org/wiki/David_McKay_Publications McKay]
* [https://en.wikipedia.org/wiki/Yasser_Seirawan Yasser Seirawan] ('''2003'''). ''[https://dl.acm.org/doi/book/10.5555/1200939 Winning Chess Endings]''. [https://en.wikipedia.org/wiki/Everyman_Chess Everyman Chess]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=66640 Marcel Duchamp endgame "splits" engines / hash phenomenon] by [[Kenneth W. Regan|Kenneth Regan]], [[CCC]], February 19, 2018 » [[Chess Problems, Compositions and Studies]], [[:Category:Marcel Duchamp|Marcel Duchamp]], [[Transposition Table]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=70827 KQKP and the like] by [[Harm Geert Muller]], [[CCC]], May 25, 2019
=External Links=
* [https://en.wikipedia.org/wiki/Queen_versus_pawn_endgame Queen versus pawn endgame from Wikipedia]
* [https://www.chess.com/article/view/queen-vs-pawn-on-7th Queen vs. Pawn on 7th] by TonightOnly, [https://en.wikipedia.org/wiki/Chess.com Chess.com], July 12, 2008
=References=
<references />
'''[[Endgame|Up one Level]]'''
The '''Queen versus Pawn Endgame''' (KQKP) is usually won by the queen side, in particular if the queen can occupy the pawn's [[Pawn Spans|frontspan]].
Even if the pawn is ready to [[Promotions|promote]], supported by its own king, the technique is to come closer with the attacking king, after the defending king was forced to block the [[Promotion Square|promotion square]] due to a queen check.
However, with rook and bishop pawns on the seventh (second) rank, [[stalemate|stalemate]] is looming with the defending king in the corner.
There are even some rare cases with center and knight pawns where the attacking king hinders its own queen to give check <ref>[https://en.wikipedia.org/wiki/Queen_versus_pawn_endgame#Central_pawn_or_knight_pawn Queen versus pawn endgame - Central pawn or knight pawn | Wikipedia]</ref>.
<span id="RookPawn7"></span>
=Rook Pawn on 7th=
The [[Draw|draw]] motive is a [[stalemate|stalemate]] threat, after the defending king blocks its own pawn after a queen check on the neighbouring knight file, so that the attacking king can't come closer.
A [[Distance|Chebyshev Distance]] of at least four to the [[Promotion Square|promotion square]] with a [[Manhattan-Distance|Manhattan distance]] less than eight for the attacking king is necessary to win that game (<span style="background-color: #c0ffc0;">green area below</span>).
While implementing this pattern inside a [[Interior Node Recognizer|interior node recognizer]], one has to take care that with the king in the corner (i.e. black king on a1), the queen has no mate in one (i.e. on c1).
<fentt border="double" style="font-size:24pt">...Q..../....K.../......../(....)..../(.....).../(.....).../(pk...).../(kk...)...</fentt>
<span id="BishopPawn7"></span>
=Bishop Pawn on 7th=
A similar draw motive occurs here with [[stalemate|stalemate]] after the queen captured the bishop pawn.
The winning area of the attacking king requires a bit more calculation.
Critical squares for the [[Distance|Chebyshev Distance]] are the neighbouring square on the same rank on the luff-side (i.e. for black pawn on c2, [[Distance|ϑ(♔,d2)]]),
and the diagonal neighbouring square on the lee-side one rank back (i.e. for black pawn on c2, [[Distance|ϑ(♔,b3)]]).
<ref>[[Interior Node Recognizer]] implemented in [[IsiChess]]</ref>
* With a <span style="background-color: #c0ffc0;">distance below two</span> to any of these critical squares, the game is won.
* A <span style="background-color: #cc80cc;">distance of two</span> to any of these critical squares is required to win the game if the defending king blocks its pawn
* Even a distance of two is not sufficient, if the defending king occupies the corner square (i.e. a1), or the 7th/8th (1st/2nd) rank on the neighbouring knight file (i.e. b1, b2).
<fentt border="double" style="font-size:24pt">...Q..../....K.../......../{....}..../(...){...}../(.+...){.}../(.kp+.){.}../kk{k}(..){.}..</fentt>
=See also=
* [[Draw Evaluation]]
* [[Interior Node Recognizer]]
=Publications=
* [https://en.wikipedia.org/wiki/Reuben_Fine Reuben Fine] ('''1941'''). ''[https://archive.org/details/basicchessending00reub Basic Chess Endings]''. [https://en.wikipedia.org/wiki/George_Bell_%26_Sons Bell & Sons]
* [[Karsten Müller]], [https://en.wikipedia.org/wiki/Frank_Lamprecht Frank Lamprecht] ('''2001'''). ''[http://www.gambitbooks.com/books/Fundamental_Chess_Endings.html Fundamental Chess Endings]''. [https://en.wikipedia.org/wiki/Gambit_Publications Gambit Publications]
* [https://en.wikipedia.org/wiki/Reuben_Fine Reuben Fine], [https://en.wikipedia.org/wiki/Pal_Benko Pal Benko] ('''2003'''). ''[https://en.wikipedia.org/wiki/Basic_Chess_Endings Basic Chess Endings]''. [https://en.wikipedia.org/wiki/David_McKay_Publications McKay]
* [https://en.wikipedia.org/wiki/Yasser_Seirawan Yasser Seirawan] ('''2003'''). ''[https://dl.acm.org/doi/book/10.5555/1200939 Winning Chess Endings]''. [https://en.wikipedia.org/wiki/Everyman_Chess Everyman Chess]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=66640 Marcel Duchamp endgame "splits" engines / hash phenomenon] by [[Kenneth W. Regan|Kenneth Regan]], [[CCC]], February 19, 2018 » [[Chess Problems, Compositions and Studies]], [[:Category:Marcel Duchamp|Marcel Duchamp]], [[Transposition Table]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=70827 KQKP and the like] by [[Harm Geert Muller]], [[CCC]], May 25, 2019
=External Links=
* [https://en.wikipedia.org/wiki/Queen_versus_pawn_endgame Queen versus pawn endgame from Wikipedia]
* [https://www.chess.com/article/view/queen-vs-pawn-on-7th Queen vs. Pawn on 7th] by TonightOnly, [https://en.wikipedia.org/wiki/Chess.com Chess.com], July 12, 2008
=References=
<references />
'''[[Endgame|Up one Level]]'''
