Editing Two knights endgame (section)

===Two knights===
====In the corner====
{{Chess diagram small
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| Keres, diagram 7
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| Two knights cannot force checkmate.
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The player with the lone king has to make a [[blunder (chess)|blunder]] to be checkmated. In this position, 1.Ne7 or 1.Nh6 immediately [[stalemate]]s Black. White can try instead:

: '''1. Nf8 Kg8'''
: '''2. Nd7 Kh8'''
: '''3. Nd6 Kg8'''
: '''4. Nf6+''' 
and now if Black moves 4...Kh8?? then 5.Nf7# is checkmate, but if Black moves
: '''4... Kf8!'''
then White has made no progress.<ref>{{Harvcol|Keres|2018|p=10}}</ref>
{{clear}}

{{Chess diagram
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| Berger
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| Draw with either side to move
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[[Johann Berger]] gave this position, a draw with either side to move. With White to move:
: '''1. Nf5 Kh8'''
: '''2. Ng5 Kg8'''
: '''3. Ne7+ Kf8!''' (Black just avoids 3...Kh8? which leads to a checkmate on the next move with 4.Nf7#)
: '''4. Kf6 Ke8'''
and White has made no progress. With Black to move:
: '''1... Kh8'''
: '''2. Nf7+ Kg8'''
: '''3. Nh6+ Kh8'''
: '''4. Ng5''' 
gives stalemate.<ref>{{Harvcol|Guliev|2003|p=74}}</ref>
{{clear}}

====On the edge====
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| White can also try for a mate on the edge of the board
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There are also checkmate positions with the inferior side's king on the edge of the board (instead of the corner), but again they cannot be forced.<ref>{{cite web|url=http://www.geocities.com/rba_schach2000/overview_english.htm |title=Chess program Wilhelm |url-status=unfit |archive-url=https://web.archive.org/web/20081208015339/http://www.geocities.com/rba_schach2000/overview_english.htm |archive-date=December 8, 2008 }} + {{cite web|url=http://auto-chess.blogspot.ch/2012/11/download-nalimov-end-game-tablebases-2.html|title=Nalimov Engame Tablebases|website=AutoChess|date=11 November 2012 }}</ref> In the position at right, White can try '''1. Nb6+''', hoping for 1...Kd8?? 2.Ne6#. Black can easily avoid this with, for example, '''1... Kc7'''. This possible checkmate is the basis of some problems (see below).
{{clear}}

====Examples from games====
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| Benko vs. Bronstein, 1949

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| Position before 104... f1=N+
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In this position from a 1949 game<ref>[http://www.chessgames.com/perl/chessgame?gid=1033751 Benko–Bronstein]</ref> between [[Pal Benko]] and [[David Bronstein]], Black [[promotion (chess)|underpromoted]] to a knight. Black did not [[promotion (chess)|promote]] to a queen or any other piece because White could [[fork (chess)|fork]] Black's king and his newly promoted piece (e.g. 104...f1=Q 105.Ne3+) immediately after the promotion. 
:'''104...f1=N+'''
:'''105. Kc3 Kf3'''.
White made the humorous move 
:'''106. Nh2+'''
forking Black's king and knight, but [[sacrifice (chess)|sacrificing]] the knight. Black responded
:'''106... Nxh2''' 
and a [[draw by agreement|draw was agreed]].<ref>{{Harvcol|Benko|2007|p=133}}</ref> (A draw by [[threefold repetition]] could have been claimed on move 78 and at other times.)
{{clear}}

{{Chess diagram small
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| Karpov vs. Korchnoi, 1981

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| Position after 80. Nf5
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Another example is the eighth game of the 1981 [[World Chess Championship 1981|World Chess Championship]] match between [[Anatoly Karpov]] and [[Viktor Korchnoi]].<ref>[http://www.chessgames.com/perl/chessgame?gid=1068236 Karpov vs. Korchnoi]</ref>
Black forces a draw by 
:'''80... Nf7!'''
:'''81. h7 Ng5!'''
:'''82. Ne7+ Kb7'''
:'''83. Nxg6 Nxh7'''
:'''84. Nxh7 draw'''<ref>{{Harvcol|Mednis|1996|p=41}}</ref>
{{clear}}