chessametic

From chess alphametic, chessametics are alphametics which use valid chess movements (in an older method of recording chess games, descriptive notation) rather than words or phrases.

Chessametics were invented in the 1970s by Michael Keith (the individual responsible for Keith Numbers, the world's shortest function to calculate the day of the week and Cadaeic Cadenza, a 3835 digit mnemonic for pi).

Michael Keith published this chessametic in 1975 in the Journal of Recreational Mathematics, volume 8, number 4:

     P-K4   P-K4 
     B-B4   P-R4 
     Q-B3   P-R4 
     QxP 
     ......and checkmate: White says "I win!".1 

Note that Black's two P-R4 moves are ambiguous (they ought to be identified as P-KR4 and P-QR4 respectively) although it makes no difference in the end board position. Similarly, White's final QxP should technically specify which Pawn is captured. Writing all moves in a single column, along with White's comment gives:

     P-K4
     P-K4
     B-B4
     P-R4
     Q-B3
     P-R4
      QxP
     ----
     IWIN

... which is a valid alphametic.

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¹ For completeness' sake, here are the two possible transcriptions of the above game in current algebraic notation:

     1. e4    e5
     2. Bc4   h5
     3. Qf3   a5
     4. Qxf7#

     1. e4    e5
     2. Bc4   a5
     3. Qf3   h5
     4. Qxf7#