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'''[[Main Page|Home]] * [[Evaluation]] * [[Evaluation of Pieces]] * Bad bishop'''
'''Bad bishop''',<br/>
a bishop whose [[Mobility|mobility]] is restricted by own pawns. As opposed to normal mobility problems, this situation is semi-permanent (more so if the position is blocked), which fact justifies singling it out as another evaluation term. Bad bishop is not such a liability if it is placed outside the pawn chain (Bf5 in the Slav). For that reason some programs, like [[Crafty]], score a bishop as bad only if its forward mobility is impaired.
For a [[Bitboards|bitboard-based]] program a feasible approach would be to create an array of 64 bitboards, indexed by a Bishop's position, and marking the pawn positions which would make our bishop bad.
=See also=
* [[Pawn Rams (Bitboards)]]
* [[Bishops of Opposite Colors]]
* [[Color of a Square]]
* [[Color Weakness]]
=Publications=
* [[Matej Guid]], [[Martin Možina]], [[Jana Krivec]], [[Aleksander Sadikov]], [[Ivan Bratko]] ('''2008'''). ''[http://link.springer.com/chapter/10.1007/978-3-540-87608-3_18 Learning Positional Features for Annotating Chess Games: A Case Study]''. [[CG 2008]], [http://www.ailab.si/matej/doc/Learning_Positional_Features-Case_Study.pdf pdf]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=4815 Evaluating bad bishops] by [[Tord Romstad]], [[Computer Chess Forums|Winboard Programming Forum]], May 15, 2006
* [http://www.open-chess.org/viewtopic.php?f=5&t=785 Bad/good bishops in R3 and IPPOLIT/IvanHoe] by [[Mark Watkins]], [[Computer Chess Forums|Open Chess Programming Forum]], November 30, 2010
=External Links=
* [https://en.wikipedia.org/wiki/Bishop_%28chess%29#Good_bishop_and_bad_bishop Good bishop and bad bishop from Wikipedia]
* [http://www.chess.com/article/view/how-bad-is-a-bad-bishop How Bad is a Bad Bishop?] by [http://www.chess.com/members/view/energia Iryna Zenyuk], February 27, 2019, [http://www.chess.com/ Chess.com]
* [http://www.chess.com/article/view/the-bishows-show-bad-bishop The Bishow's Show: Bad Bishop] by [http://www.chess.com/members/view/energia Iryna Zenyuk], March 09, 2012, [http://www.chess.com/ Chess.com]
'''[[Evaluation of Pieces|Up one Level]]'''
'''Bad bishop''',<br/>
a bishop whose [[Mobility|mobility]] is restricted by own pawns. As opposed to normal mobility problems, this situation is semi-permanent (more so if the position is blocked), which fact justifies singling it out as another evaluation term. Bad bishop is not such a liability if it is placed outside the pawn chain (Bf5 in the Slav). For that reason some programs, like [[Crafty]], score a bishop as bad only if its forward mobility is impaired.
For a [[Bitboards|bitboard-based]] program a feasible approach would be to create an array of 64 bitboards, indexed by a Bishop's position, and marking the pawn positions which would make our bishop bad.
=See also=
* [[Pawn Rams (Bitboards)]]
* [[Bishops of Opposite Colors]]
* [[Color of a Square]]
* [[Color Weakness]]
=Publications=
* [[Matej Guid]], [[Martin Možina]], [[Jana Krivec]], [[Aleksander Sadikov]], [[Ivan Bratko]] ('''2008'''). ''[http://link.springer.com/chapter/10.1007/978-3-540-87608-3_18 Learning Positional Features for Annotating Chess Games: A Case Study]''. [[CG 2008]], [http://www.ailab.si/matej/doc/Learning_Positional_Features-Case_Study.pdf pdf]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=4815 Evaluating bad bishops] by [[Tord Romstad]], [[Computer Chess Forums|Winboard Programming Forum]], May 15, 2006
* [http://www.open-chess.org/viewtopic.php?f=5&t=785 Bad/good bishops in R3 and IPPOLIT/IvanHoe] by [[Mark Watkins]], [[Computer Chess Forums|Open Chess Programming Forum]], November 30, 2010
=External Links=
* [https://en.wikipedia.org/wiki/Bishop_%28chess%29#Good_bishop_and_bad_bishop Good bishop and bad bishop from Wikipedia]
* [http://www.chess.com/article/view/how-bad-is-a-bad-bishop How Bad is a Bad Bishop?] by [http://www.chess.com/members/view/energia Iryna Zenyuk], February 27, 2019, [http://www.chess.com/ Chess.com]
* [http://www.chess.com/article/view/the-bishows-show-bad-bishop The Bishow's Show: Bad Bishop] by [http://www.chess.com/members/view/energia Iryna Zenyuk], March 09, 2012, [http://www.chess.com/ Chess.com]
'''[[Evaluation of Pieces|Up one Level]]'''
