rule of thumb to determine whether a king can prevent an enemy pawn from promoting English
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British English
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    method English
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    /g/1231g353
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    /g/121y0fzb
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    schematic English
    example of the rule of the square: since the black king is within the 4×4 square of the white pawn, it can prevent the white pawn’s promotion (or capture the promoted piece immediately afterwards) (English)
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    example of the rule of the square: since the black king is outside the 4×4 square of the white pawn, it can’t prevent the white pawn’s promotion (English)
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