Editing Endgame study

{{Short description|Composed chess endgame position}}
In the game of [[chess]], an '''endgame study''', or just '''study''', is a type of [[chess problem]] that starts with a composed position—i.e. one that has been made up rather than played in an actual game—where the goal is to find the essentially unique way for one side (usually White) to win or draw, as stipulated, against any moves the other side plays. If the study does not end in the end of the game, then the game's eventual outcome should be obvious, and White can have a selection of various moves. There is no limit to the number of moves which are allowed to achieve the win; this distinguishes studies from the genre of direct mate problems (e.g. "mate in 2"). Such problems also differ qualitatively from the very common genre of tactical puzzles based around the middlegame, often based on an actual game, where a decisive tactic must be found. 
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==Composed studies==
Composed studies predate the modern form of chess. [[Shatranj]] studies exist in manuscripts from the 9th century, and the earliest treatises on modern chess by the likes of [[Luis Ramirez Lucena]] and [[Pedro Damiano]] (late 15th and early 16th century) also include studies. However, these studies often include superfluous pieces, added to make the position look more "game-like", but which take no part in the actual solution (something that is never done in the modern study). Various names were given to these positions (Damiano, for example, called them "subtleties"); the first book which called them "studies" appears to be ''Chess Studies'', an 1851 publication by [[Josef Kling]] and [[Bernhard Horwitz]], which is sometimes also regarded as the starting point for the modern endgame study. The form is considered to have been raised to an art in the late 19th century, with [[A. A. Troitsky]] and [[Henri Rinck]] particularly important in this respect.

Most [[chess composer|composers]], including Troitsky, Rinck, and other famous figures such as [[Genrikh Kasparyan]], are known primarily for their studies, being little known as players. However, some famous players have also composed endgame studies, with [[Emanuel Lasker]], [[Richard Réti]], [[Vasily Smyslov]], and [[Jan Timman]] being perhaps the most notable ones.

==Examples==
{{main|Réti endgame study}}
{{Chess diagram
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|Richard Réti, <br />''Ostrauer Morgenzeitung'' Dec. 4, 1921
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|White to play and draw. One of the most famous studies of all time.
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[[Richard Réti]]'s study is one of the most famous of all time. It is White to play and draw. At first sight, this seems an impossible task: if White tries to chase after Black's pawn he can never catch it (1.Kh7 h4 2.Kh6 h3 etc. is clearly hopeless), while it is clear that Black will simply take White's pawn if he tries to promote it.

White can draw, however, by taking advantage of the fact that the king can move towards both pawns at once. The solution is '''1. Kg7{{chesspunc|!}} h4''' (1...Kb6 2. Kf6! h4 3.Ke5! transposes) '''2. Kf6! Kb6''' (if 2...h3, then 3.Ke6 h2 4.c7 Kb7 5.Kd7 allows white to promote his pawn) '''3. Ke5!''' Now, if 3...Kxc6, then 4.Kf4 stops Black's pawn after all, while if 3...h3 4.Kd6 allows White to promote his pawn. Either way, the result is a draw.  (See also {{seclink|King and pawn versus king endgame|Rule of the square}}.)
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{| align="right" 
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|+ Genrikh Kasparyan, ''Magyar Sakkélet'' 1962
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|White to play and draw. An example of a more complicated study.
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|Position after 8.Rg1 (see analysis)
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Not all studies are as simple as the above Réti example. This study (first diagram) is by [[Genrikh Kasparyan]] (first published in ''Magyar Sakkélet'', 1962). White is to play and draw. The main line of the solution is '''1. Ra1 a2 2. Ke6 Ba3 3. Bf4 Bb2 4. Be5 a3 5. Kd5 Bg6 6. Bd4 Bf7+ 7. Ke4 Bc4 8. Rg1''', but there are various alternatives for both sides. For example, White could try 1.Bf4 on his first move, with the idea 1...Bxa2 2.Bxd6 and 3.Bxa3 is a draw, but Black can defeat this idea with 1...Bxf4 2.Rxa3 Bc2, which wins. To understand why one move works and another one does not, requires quite advanced chess knowledge. Indeed, it will not be obvious to many players that the position at the end of the given line (second diagram) is a draw at all.
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{{Chess diagram
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|Leopold Mitrofanov, <br />''MT Rustaveli'' 1967 (corrected)
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|White to play and win
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One of the most notable studies is [[Leopold Mitrofanov]]'s 1967 first-prize winner.<ref>{{cite web |url= https://timkr.home.xs4all.nl/chess2/mitrofanov.htm |title= A genius' bad luck |last= Krabbé |first= Tim |author-link= Tim Krabbé |publisher= Tim Krabbé's Chess Curiosities |access-date= 2016-10-22}}</ref> Unfortunately, Mitrofanov's original study was subsequently found to have a {{chessgloss|cook}}, a miraculous defense that enabled Black either to obtain [[perpetual check]] or reach a [[Draw (chess)|drawn]] [[Chess endgame|ending]].

Solution: '''1. b6+ Ka8 2. Re1! Nxe1 3. g7 h1=Q''' (if 3...Nc4+ then 4.Kb5 h1=Q 5.g8=Q+ Bb8 6.a7 Na3+ 7.Kc6 Qh2 8.axb8=Q+ Qxb8 9.b7+ Ka7 10.Qg1+ Ka6 11.Qb6 mate) '''4. g8=Q+ Bb8 5. a7 Nc6+ 6. dxc6 Qxh5+ 7. Qg5{{chesspunc|!!}} '''(not 7.Ka6{{chesspunc|?}} Qe2+ or 7.Kb4? Qh4+ with perpetual check)''' Qxg5+ 8. Ka6''' (the queen is deflected from the white diagonal where she could give check) '''8... Bxa7''' (or 8...Qb5+ 9.Kxb5 Nc2 10.c7 and wins) '''9. c7!''' (a silent move; the double threat c8=Q+ and b7 mate forces Black to sacrifice the queen) '''9... Qa5+ 10. Kxa5 Kb7 11. bxa7''' and White wins.
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===Early example===
{{Chess diagram
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|al-Adli (~800–870), <br />''Arabic manuscript'' 1140<ref>Müller & Lamprecht, p. 257</ref>
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|White wins with either side to move
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Most old [[shatranj]] studies are not valid in modern chess because of changed rules. However, the moves of the king, rook, and knight are unchanged.  In this Arabic study White wins because the black knight is poorly placed. With White to move the best move is '''1. Rd1''', but it is not the only winning move. If Black is to move, '''1... Kb8! 2. Kc6! Na5+! 3. Kb6! Nc4+ 4. Kb5! Ne5 5. Re1! Nd7 6. Kc6!''' wins.
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==Studies and special moves==
The special moves or [[rules of chess]], such as castling, underpromotion, double-square pawn advance, and ''[[en passant]]'' are commonly a key feature of studies, as are [[sacrifice (chess)|sacrifices]].

===Castling===
{{Chess diagram
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|[[Alexey Selezniev]], <br />''Tidskrift for Schack'' 1921
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|White wins
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Castling in the [[Chess endgame|endgame]] occurs seldom and is more often seen in studies. Here is one example where White wins by privilege of castling rights.

{{chessprobgloss|Try}}: 1.0-0-0? Ra2! 2.d7 Ra1+ 3.Kc2 Rxd1 4.Kxd1 Kc7 drawn.

White needs: '''1. d7! Kc7 2. d8=Q+! Kxd8 3. 0-0-0+''' simultaneously attacking the [[King (chess)|king]] and [[Rook (chess)|rook]] that is captured next move.
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== Study engineering ==

{{Chess diagram
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|Frédéric Lazard, <br />''L’Italia, Scacchistica'' 1946 
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|White to play and draw 
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With the creation and popularization of chess-playing computer software programs, many of which have achieved [[Elo ratings]] significantly higher than top human players, many composers collaborate with them both in composing and solving compositions. Though proven to be helpful, positions have been found which cause even the strongest engines to incorrectly evaluate the outcome. Chess master [[Frédéric Lazard]]'s 1946 composition is White to play and draw.<ref>{{cite web |url= http://en.chessbase.com/post/kavalek-in-huffington-new-king-tut-puzzles |title=King Tut in Chess Puzzles |last1=Kavalek |first1=Lubomir |author-link1=Lubomir Kavalek |date=2011-02-22 |publisher=[[Chessbase]] }}</ref>

Solution: '''1. Ne4+ Kh4''' (1...dxe4 2.Be1#) '''2. Ng3! Qf8''' (2...fxg3 3.Bb6!! and black cannot advance his pawns as the bishop will take them; if he recaptures it is stalemate. Check with the queen is met by Bg8 and stalemate.) '''3. Be1 fxg3 4. Bf2! d4''' (4...Qxf2 stalemate, 4...gxf2 5.g3+ Kh3 stalemate) '''5. Bxd4 c5 6. Bxc5 Qf1+ 7. Bg1 Qf2 8. Bxf2 gxf2 9. g3+ Kxg3'''<ref>{{cite web |url=http://en.chessbase.com/news/2011/games/kavalek34cg0.htm |title=Lazard, Frederic – White draws. L'Italia Scacchistica, 1946 |last1=Kavalek |first1=Lubomir |author-link1=Lubomir Kavalek |date=2011 |publisher=[[Chessbase]] }}</ref> drawn.
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==See also==
* [[List of chess endgame study composers]]
* [[Saavedra position]]

==References==
{{Reflist}}

==Further reading==
*{{citation
|last1=Müller|first1=Karsten|author-link1=Karsten Müller
|last2=Lamprecht|first2=Frank |author-link2=Lamprecht, Frank Lamprecht
|year=2001
|title=Fundamental Chess Endings
|publisher=[[Gambit Publications]]
|isbn = 1-901983-53-6}}
*{{Citation
|last=Timmer|first=Robert|author-link=Robert Timmer 
|year=1997
|title=Startling Castling!
|publisher=Batsford
|isbn= 0-713481-37-4}}
*John Beasley and Timothy Whitworth, ''Endgame Magic'' (Batsford, 1996), an introduction to the subject
*[[A. J. Roycroft]], ''Test Tube Chess'' (Faber, 1972), a general overview of studies, including 433 examples
*''Flemish miniatures. 123 chess endgame studies'', composed, compiled and published by [[Ignace Vandecasteele]], [[Julien Vandiest]] and [[Roger Missiaen]], 1998, ARVES ‘book of the year’ 1997, {{ISBN|90-901161-2-5}}.  The best studies of the [[The Three Musketeers|three musketeers]] of the [[Flanders|Flemish]] endgame community.
*''360 Brilliant and Instructive End Games'', by [[A. A. Troitzky]], 1968, Dover Pubns. {{ISBN|0-486-21959-3}}. A collection of 360 endgame studies by Troitsky.
*''One Pawn Saves the Day: A World Champion's Favorite Studies'', by Sergei Tkachenko, 2017, Limited Liability Company Elk and Ruby Publishing House {{ISBN|5-950-04334-0}}. 100 studies whose common theme is that white ends up with just one pawn in the finale, yet manages to win or draw.
*''One Knight Saves the Day: A World Champion's Favorite Studies'', by Sergei Tkachenko, 2017, Limited Liability Company Elk and Ruby Publishing House {{ISBN|5-950-04335-9}}. 100 studies whose common theme is that white ends up with just one knight in the finale, yet manages to win or draw.
*''One Bishop Saves the Day: A World Champion's Favorite Studies'', by Sergei Tkachenko, 2017, Limited Liability Company Elk and Ruby Publishing House {{ISBN|5-950-04336-7}}. 100 studies whose common theme is that white ends up with just one bishop in the finale, yet manages to win or draw.
*''One Rook Saves the Day: A World Champion's Favorite Studies'', by Sergei Tkachenko, 2017, Limited Liability Company Elk and Ruby Publishing House {{ISBN|5-950-04337-5}}. 100 studies whose common theme is that white ends up with just one rook in the finale, yet manages to win or draw.
* {{Citation
 |surname1=Chernev
 |given1=Irving
 |author-link1=Irving Chernev
 |title=200 Brilliant Endgames
 |publisher=Dover
 |isbn=0-486-43211-4
 |year=1989
 |url-access=registration
 |url=https://archive.org/details/200brilliantendg00cher
 }}
*{{Citation
 | author1=Dvoretsky, Mark
 | author-link=Mark Dvoretsky
 | author2=Pervakov, Oleg
 | year=2009
 | title=Studies for Practical Players
 | publisher=Russell Enterprises
 | isbn=978-1-888690-64-4}}

==External links==
* [http://www.arves.org/arves/index.php/en/halloffame/biographical-data ARVES biographical data on composers]
* [https://web.archive.org/web/20120104113117/http://www.sci.fi/~stniekat/pccc/hcc5.pdf Handbook of Chess Composition]

{{Chess|state=collapsed}}

[[Category:Chess endgames]]
[[Category:Chess problems]]