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authorMitja Felicijan <mitja.felicijan@gmail.com>2026-02-12 20:57:17 +0100
committerMitja Felicijan <mitja.felicijan@gmail.com>2026-02-12 20:57:17 +0100
commitb333b06772c89d96aacb5490d6a219fba7c09cc6 (patch)
tree211df60083a5946baa2ed61d33d8121b7e251b06 /llama.cpp/grammars/chess.gbnf
downloadllmnpc-b333b06772c89d96aacb5490d6a219fba7c09cc6.tar.gz
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+# Specifies chess moves as a list in algebraic notation, using PGN conventions
+
+# Force first move to "1. ", then any 1-2 digit number after, relying on model to follow the pattern
+root ::= "1. " move " " move "\n" ([1-9] [0-9]? ". " move " " move "\n")+
+move ::= (pawn | nonpawn | castle) [+#]?
+
+# piece type, optional file/rank, optional capture, dest file & rank
+nonpawn ::= [NBKQR] [a-h]? [1-8]? "x"? [a-h] [1-8]
+
+# optional file & capture, dest file & rank, optional promotion
+pawn ::= ([a-h] "x")? [a-h] [1-8] ("=" [NBKQR])?
+
+castle ::= "O-O" "-O"?