Editing Glossary of chess problems (section)

== B ==
{{glossary}}

{{term|term= Babson task |content = [[Babson task]] {{anchor|Babson task|Babson tasks}} }}
{{defn|defn= A problem in which black promotion defences to all possible pieces are answered by a promotion of the same white piece—an extreme form of [[#Allumwandlung|Allumwandlung]].}}

{{term|term= battery |content = battery {{anchor|Battery|batteries}} }}
{{defn|defn= A pair of pieces, where the front piece moves away to discover an attack from the back piece.  For example, if a white knight stands between a white rook and the black king, moving the knight – that is, "firing" the battery – results in check.}}

{{term|term= block |content = block {{anchor|Block|blocks}} }}
{{defn|defn= A problem in which the [[#key|key]] provides no [[#threat|threat]], but instead puts Black in a position of [[zugzwang]], where every move leads to a mate. In a ''complete block'', all of Black's moves have mates provided in the [[#set play|set play]] and the key is simply a waiting move; in an ''incomplete block'', not all black moves are provided with mates in the set play – the key provides for those that do not; in a [[#mutate|mutate]], some of the mates provided in the set play are changed following the key.}}

{{term|term= by-play |content = by-play {{anchor|By-play|by-plays}} }}
{{defn|defn= Variations not directly connected to the problem's [[#theme|theme]].}}

{{glossary end}}