Game 153468            (go)

19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
	a b c d e f g h j k l m n o p q r s t

. 'gn is not allowed in chess unless n is an integer between 1 and 8 inclusive, where 1 and 8 are to interpreted as the standard numerals standing for integers in the ordered real-closed field R, with the *canonical* ordering. (As opposed to, say, an integer in the domain Z[2+i*sqrt(5)] or an integer in some exotic Grothendieck topos). (Normajean Yates)