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Created page with "'''Home * Chess * Tactics * Skewer''' FILE:Tercio piquiers.jpg|border|right|thumb|Disposición de los piqueros <ref>[https://es.wikipedia.org/wiki/Piq..."
'''[[Main Page|Home]] * [[Chess]] * [[Tactics]] * Skewer'''
[[FILE:Tercio piquiers.jpg|border|right|thumb|Disposición de los piqueros <ref>[https://es.wikipedia.org/wiki/Piquero Piquero - Wikipedia, la enciclopedia libre] (Spanish)</ref> ]]
A '''Skewer''' (thrust, reverse [[Pin|pin]]) is a [[X-ray]] related chess tactic where a [[Sliding Pieces|sliding piece]], a [[Bishop|bishop]], a [[Rook|rook]] or a [[Queen|queen]] [[Double Attack|double attacks]] two opponent pieces on the same [[Rays|ray]] similar to a pin, except the more valuable piece, often the [[Check|checked]] [[King|king]] (absolute skewer), the queen or a rook (relative skewer) is attacked directly and compelled to move to parry the check or to avoid its [[Captures|capture]], therefor exposing a less valuable piece which might be [[En prise|en prise]]. Some programs perform not only checks at the top of their [[Quiescence Search|quiescence search]], but also attacks to the queen by either bishop and rook, or attacking a rook by a bishop, if an exposed piece behind might be en prise.
=Composition=
Following composition by [https://en.wikipedia.org/wiki/Ado_Kraemer Ado Kraemer] and [https://en.wikipedia.org/wiki/Walther_von_Holzhausen Walther von Holzhausen], Magdeburger Zeitung, 1930 <ref>[http://de.wikipedia.org/wiki/Ado_Kraemer#Schachkomposition Schachkomposition] by [https://en.wikipedia.org/wiki/Ado_Kraemer Ado Kraemer] and [https://en.wikipedia.org/wiki/Walther_von_Holzhausen Walther von Holzhausen], Magdeburger Zeitung, 1930</ref> covers a skewer. The threat 1... b1=Q can be parried with the skewer b8=Q+, which safes white game and forces [[Stalemate|stalemate]] after 1.Ka8 Bh2 and sacrificing all pawns:
<fentt border="double" style="font-size:24pt">1K6/1P6/1kP5/3P4/4P3/5P2/1p4P1/6b1</fentt>
1K6/1P6/1kP5/3P4/4P3/5P2/1p4P1/6b1 w - -
=See also=
* [[Battery]]
* [[Double Attack]]
* [[Pin]]
* [[Sliding Piece Attacks]]
* [[X-ray]]
* [[X-ray Attacks (Bitboards)]]
* [[Zwischenzug]]
=External Links=
* [https://en.wikipedia.org/wiki/Skewer_%28chess%29 Skewer (chess) from Wikipedia]
* [http://www.top10chess.com/2008/09/tactic-motif-v-skewer.html Top 10 chess: Tactic Motif V: Skewer]
* [http://www.chess-game-strategies.com/chess-skewer.html The Chess Skewer Attack]
=References=
<references />
'''[[Tactics|Up one Level]]'''
[[FILE:Tercio piquiers.jpg|border|right|thumb|Disposición de los piqueros <ref>[https://es.wikipedia.org/wiki/Piquero Piquero - Wikipedia, la enciclopedia libre] (Spanish)</ref> ]]
A '''Skewer''' (thrust, reverse [[Pin|pin]]) is a [[X-ray]] related chess tactic where a [[Sliding Pieces|sliding piece]], a [[Bishop|bishop]], a [[Rook|rook]] or a [[Queen|queen]] [[Double Attack|double attacks]] two opponent pieces on the same [[Rays|ray]] similar to a pin, except the more valuable piece, often the [[Check|checked]] [[King|king]] (absolute skewer), the queen or a rook (relative skewer) is attacked directly and compelled to move to parry the check or to avoid its [[Captures|capture]], therefor exposing a less valuable piece which might be [[En prise|en prise]]. Some programs perform not only checks at the top of their [[Quiescence Search|quiescence search]], but also attacks to the queen by either bishop and rook, or attacking a rook by a bishop, if an exposed piece behind might be en prise.
=Composition=
Following composition by [https://en.wikipedia.org/wiki/Ado_Kraemer Ado Kraemer] and [https://en.wikipedia.org/wiki/Walther_von_Holzhausen Walther von Holzhausen], Magdeburger Zeitung, 1930 <ref>[http://de.wikipedia.org/wiki/Ado_Kraemer#Schachkomposition Schachkomposition] by [https://en.wikipedia.org/wiki/Ado_Kraemer Ado Kraemer] and [https://en.wikipedia.org/wiki/Walther_von_Holzhausen Walther von Holzhausen], Magdeburger Zeitung, 1930</ref> covers a skewer. The threat 1... b1=Q can be parried with the skewer b8=Q+, which safes white game and forces [[Stalemate|stalemate]] after 1.Ka8 Bh2 and sacrificing all pawns:
<fentt border="double" style="font-size:24pt">1K6/1P6/1kP5/3P4/4P3/5P2/1p4P1/6b1</fentt>
1K6/1P6/1kP5/3P4/4P3/5P2/1p4P1/6b1 w - -
=See also=
* [[Battery]]
* [[Double Attack]]
* [[Pin]]
* [[Sliding Piece Attacks]]
* [[X-ray]]
* [[X-ray Attacks (Bitboards)]]
* [[Zwischenzug]]
=External Links=
* [https://en.wikipedia.org/wiki/Skewer_%28chess%29 Skewer (chess) from Wikipedia]
* [http://www.top10chess.com/2008/09/tactic-motif-v-skewer.html Top 10 chess: Tactic Motif V: Skewer]
* [http://www.chess-game-strategies.com/chess-skewer.html The Chess Skewer Attack]
=References=
<references />
'''[[Tactics|Up one Level]]'''
