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14 lines
565 B
Text
14 lines
565 B
Text
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# Specifies chess moves as a list in algebraic notation, using PGN conventions
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# Force first move to "1. ", then any 1-2 digit number after, relying on model to follow the pattern
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root ::= "1. " move " " move "\n" ([1-9] [0-9]? ". " move " " move "\n")+
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move ::= (pawn | nonpawn | castle) [+#]?
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# piece type, optional file/rank, optional capture, dest file & rank
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nonpawn ::= [NBKQR] [a-h]? [1-8]? "x"? [a-h] [1-8]
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# optional file & capture, dest file & rank, optional promotion
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pawn ::= ([a-h] "x")? [a-h] [1-8] ("=" [NBKQR])?
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castle ::= "O-O" "-O"?
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