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Created page with "'''Home * Evaluation * of Pieces * Rooks on (Semi) Open Files''' An open file is usually defined as a file with no pa..."
'''[[Main Page|Home]] * [[Evaluation]] * [[Evaluation of Pieces|of Pieces]] * Rooks on (Semi) Open Files'''
An [[Open File|open file]] is usually defined as a file with no pawns on it - a [[Half-open File|semi-open file]] as containing only the enemy pawns. In both cases a rook occupying such a [[Files|file]] gets greater vertical [[Mobility|mobility]] as well as a chance to penetrate the enemy camp, positioning itself on the [[Rook on Seventh|7th rank]].
Early versions of [[Fruit]] omitted this evaluation term altogether. Some programs, like [[Rebel]], have an additional bonus for doubling rooks on an open file. Some increase the bonus if the file has a bearing against the [[King Safety|enemy king]] , some make the bonus dependent on the number of own pawns. It is worth noting that [https://en.wikipedia.org/wiki/Aron_Nimzowitsch Nimzowitsch] in [https://en.wikipedia.org/wiki/Mein_System My System] used the term "(semi) open file" even for the rooks standing in front of the [[Pawn Chain|pawn chain]]. The same has been said about [[Rybka]]. Bonuses applied to a rook on an open file vary from '''8''' to '''20''' [[Centipawns|centipawns]] <ref>20 cp comes from [[Toga Log#UserManual|Toga log user manual]], after adding actual bonus and penalty for a rook on a closed file</ref>. Typical bonus for a semi-open file is half of that for a fully open file.
=See also=
* [[Half-open file]]
* [[King Safety]]
* [[Open file]]
* [[Pawns and Files (Bitboards)]]
* [[Rook on Seventh]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=55324 So same, so different] by [[Lyudmil Tsvetkov]], [[CCC]], February 12, 2015
=References=
<references />
'''[[Evaluation of Pieces|Up one Level]]'''
An [[Open File|open file]] is usually defined as a file with no pawns on it - a [[Half-open File|semi-open file]] as containing only the enemy pawns. In both cases a rook occupying such a [[Files|file]] gets greater vertical [[Mobility|mobility]] as well as a chance to penetrate the enemy camp, positioning itself on the [[Rook on Seventh|7th rank]].
Early versions of [[Fruit]] omitted this evaluation term altogether. Some programs, like [[Rebel]], have an additional bonus for doubling rooks on an open file. Some increase the bonus if the file has a bearing against the [[King Safety|enemy king]] , some make the bonus dependent on the number of own pawns. It is worth noting that [https://en.wikipedia.org/wiki/Aron_Nimzowitsch Nimzowitsch] in [https://en.wikipedia.org/wiki/Mein_System My System] used the term "(semi) open file" even for the rooks standing in front of the [[Pawn Chain|pawn chain]]. The same has been said about [[Rybka]]. Bonuses applied to a rook on an open file vary from '''8''' to '''20''' [[Centipawns|centipawns]] <ref>20 cp comes from [[Toga Log#UserManual|Toga log user manual]], after adding actual bonus and penalty for a rook on a closed file</ref>. Typical bonus for a semi-open file is half of that for a fully open file.
=See also=
* [[Half-open file]]
* [[King Safety]]
* [[Open file]]
* [[Pawns and Files (Bitboards)]]
* [[Rook on Seventh]]
=Forum Posts=
* [http://www.talkchess.com/forum/viewtopic.php?t=55324 So same, so different] by [[Lyudmil Tsvetkov]], [[CCC]], February 12, 2015
=References=
<references />
'''[[Evaluation of Pieces|Up one Level]]'''
