Bad+bishop

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 * Bad bishop** is a bishop whose 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 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**). //[|Learning Positional Features for Annotating Chess Games: A Case Study]//. CG 2008, [|pdf]

=Forum Posts=
 * [|Evaluating bad bishops] by Tord Romstad, Winboard Programming Forum, May 15, 2006
 * [|Bad/good bishops in R3 and IPPOLIT/IvanHoe] by Mark Watkins, Open Chess Programming Forum, November 30, 2010

=External Links=
 * [|Good bishop and bad bishop from Wikipedia]
 * [|How Bad is a Bad Bishop?] by [|Iryna Zenyuk], February 27, 2019, [|Chess.com]
 * [|The Bishow's Show: Bad Bishop] by [|Iryna Zenyuk], March 09, 2012, [|Chess.com]

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