100 REM CHESS 960
110 PRINT "SPID (-1 FOR RANDOM):";
120 OPEN 1,0:INPUT#1, SP$:CLOSE 1
130 SP=VAL(SP$)
140 IF SP<0 THEN SP=INT(RND(.)*960)
150 PRINT
160 IF SP>959 THEN SP=SP-960: GOTO 160
170 AR$="--------"
180 P=SP
190 N=P AND 3:P=INT(P/4)
200 AR$=LEFT$(AR$,2*N+1)+"B"+MID$(AR$,2*N+3)
210 N=P AND 3:P=INT(P/4)
220 AR$=LEFT$(AR$,2*N)+"B"+MID$(AR$,2*N+2)
230 N=P-6*INT(P/6):P=INT(P/6)
240 P$="Q":GOSUB 420
250 N=P-10*INT(P/10):P=INT(P/10)
260 FOR N1=0 TO 3
270 : FOR N2=N1+1 TO 4
280 :   IF N<>0 THEN 340
290 :     P$="N":N=N1:GOSUB 420
300 :     P$="N":N=N2-1:GOSUB 420
310 :     N1=3
320 :     N2=4
340 :   N=N-1
350 : NEXT N2
360 NEXT N1
370 P$="R":N=0:GOSUB 420
380 P$="K":N=0:GOSUB 420
390 P$="R":N=0:GOSUB 420
400 PRINT STR$(SP);":";AR$
410 END
420 FOR I=1 TO LEN(AR$)
430 : IF MID$(AR$,I,1)<>"-" THEN 510
440 : IF N<>0 THEN 480
450 : AR$=LEFT$(AR$,I-1)+P$+MID$(AR$,I+1)
460 : I=LEN(AR$)
470 : GOTO 510
480 : N=N-1
510 NEXT I
520 RETURN