Looks like descriptive notation: http://en.wikipedia.org/wiki/Descriptive_chess_notation
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I have an old chess book (1954) by I.A. Horowitz and Fred Reinfeld titled Chess Traps..pitfalls & swindles...they use notations to identify a square on the board as N-N3 or B-N3 which squares are these....I cannot find any explanation in their book