https://www.chessprogramming.org/index.php?title=Bad_Bishop&feed=atom&action=history
Bad Bishop - Revision history
2024-03-28T17:08:08Z
Revision history for this page on the wiki
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https://www.chessprogramming.org/index.php?title=Bad_Bishop&diff=23815&oldid=prev
GerdIsenberg at 16:51, 25 February 2021
2021-02-25T16:51:53Z
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:51, 25 February 2021</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://en.wikipedia.org/wiki/Bishop_%28chess%29#Good_bishop_and_bad_bishop Good bishop and bad bishop from Wikipedia]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://en.wikipedia.org/wiki/Bishop_%28chess%29#Good_bishop_and_bad_bishop Good bishop and bad bishop from Wikipedia]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [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], <del class="diffchange diffchange-inline">February 27, 2019, </del>[<del class="diffchange diffchange-inline">http://www.chess.com/ </del>Chess.com]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [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], [<ins class="diffchange diffchange-inline">[</ins>Chess.com]<ins class="diffchange diffchange-inline">], February 27, 2019</ins></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [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], <del class="diffchange diffchange-inline">March 09, 2012, </del>[<del class="diffchange diffchange-inline">http://www.chess.com/ </del>Chess.com]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [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], [<ins class="diffchange diffchange-inline">[</ins>Chess.com]<ins class="diffchange diffchange-inline">], March 09, 2012</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Evaluation of Pieces|Up one Level]]'''</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Evaluation of Pieces|Up one Level]]'''</div></td></tr>
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Bad_Bishop&diff=2043&oldid=prev
GerdIsenberg: Created page with "'''Home * Evaluation * Evaluation of Pieces * Bad bishop''' '''Bad bishop''',<br/> a bishop whose mobility is restricted by own pawns. As o..."
2018-05-16T09:16:55Z
<p>Created page with "'''<a href="/Main_Page" title="Main Page">Home</a> * <a href="/Evaluation" title="Evaluation">Evaluation</a> * <a href="/Evaluation_of_Pieces" title="Evaluation of Pieces">Evaluation of Pieces</a> * Bad bishop''' '''Bad bishop''',<br/> a bishop whose <a href="/Mobility" title="Mobility">mobility</a> is restricted by own pawns. As o..."</p>
<p><b>New page</b></p><div>'''[[Main Page|Home]] * [[Evaluation]] * [[Evaluation of Pieces]] * Bad bishop'''<br />
<br />
'''Bad bishop''',<br/><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.<br />
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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.<br />
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=See also= <br />
* [[Pawn Rams (Bitboards)]]<br />
* [[Bishops of Opposite Colors]]<br />
* [[Color of a Square]]<br />
* [[Color Weakness]]<br />
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=Publications=<br />
* [[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]<br />
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=Forum Posts=<br />
* [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<br />
* [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<br />
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=External Links=<br />
* [https://en.wikipedia.org/wiki/Bishop_%28chess%29#Good_bishop_and_bad_bishop Good bishop and bad bishop from Wikipedia]<br />
* [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]<br />
* [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]<br />
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'''[[Evaluation of Pieces|Up one Level]]'''</div>
GerdIsenberg