Pawn+Rams+(Bitboards)

all pawns that are blocked by the opponent's pawns. A ram is a mutual mechanical obstruction. If the rammed pawn is no lever pawn, it becomes member of the immobile pawns. Specially if other properties match, e.g. there is no or no mutual lever-possibility against the opponent counterpart, rams are a **symptom** of **congealment**. The term Ram or [|Widder] in German ([|Ovis], [|Aries]) was coined by Hans Kmoch. Rammed none lever pawns in the center or extended center are most important to decide about bad bishops. || toc =Blocked Positions= Three or four isolated rams are a perfect barrier - no path for either king to enter to opposite area. code . . . . . . . . . . . . . . . . . . . . . . . . . b. . b. . b . w. . w. . w .. . . . . . . . . . . . . . . . . . . . . . . code =Code= //Working in the bitboard centric world to determine pawn related pattern set-wise.// //The code snippets rely on shifting bitboards, specially by one step only.//
 * Home * Board Representation * Bitboards * Pawn Pattern and Properties * Pawn Rams**
 * [[image:Locked.jpg width="200" link="http://www.chgs.umn.edu/museum/responses/bak/chess.html"]] ||~   || **Pawn Rams**,
 * Samuel Bak - Locked ||~  ||^   ||

code format="cpp" U64 wRam(U64 wpawns, U64 bpawns) {return soutOne(bpawns) & wpawns;} U64 bRam(U64 wpawns, U64 bpawns) {return nortOne(wpawns) & bpawns;} code Obviously the number of white rammed pawns is equal to the number of black rammed pawns.

=Mutual Mechanical Obstruction=
 * [[image:Widder.jpg width="580" height="389" link="http://flickr.com/photos/olaf_k/2079888707/"]] ||
 * Mutual Mechanical Obstruction ||

=See also=
 * Backward Pawn
 * Blockade
 * Blockage Detection

=Forum Posts=
 * [|Pawn ram code in gnuchess] by Chua Kong Sian, gnu.chess, June 18, 1994

=External Links=
 * [|Pawn Power in Chess by Hans Kmoch - Glossary of Terms - Chess Forums] - [|Chess.com]
 * [|Monsoon/Typhoon Homepage] by Scott Gasch

=References= =What links here?= include page="Pawn Rams (Bitboards)" component="backlinks" limit="30"
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