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.
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#