| 5
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| 10
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| 15
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| 17
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| 18 SET 11,1
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| 20 PRINT "THIS IS THE GAME OF CHECKERS. THE COMPUTER IS X,"
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| 25 PRINT "AND YOU ARE O. THE COMPUTER WILL MOVE FIRST."
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| 30 PRINT "SQUARES ARE REFERRED TO BY A COORDINATE SYSTEM."
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| 35 PRINT "(0,0) IS THE LOWER LEFT CORNER"
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| 40 PRINT "(0,7) IS THE UPPER LEFT CORNER"
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| 45 PRINT "(7,0) IS THE LOWER RIGHT CORNER"
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| 50 PRINT "(7,7) IS THE UPPER RIGHT CORNER"
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| 55 PRINT "THE COMPUTER WILL TYPE '+TO' WHEN YOU HAVE ANOTHER"
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| 60 PRINT "JUMP. TYPE TWO NEGATIVE NUMBERS IF YOU CANNOT JUMP."
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| 65 PRINT:PRINT:PRINT
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| 80 DIM R(4+1),S(7+1,7+1):G=-1:R(0+1)=-99
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| 90 DATA 1,0,1,0,0,0,-1,0,0,1,0,0,0,-1,0,-1,15
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| 120 FOR X=0 TO 7:FOR Y=0 TO 7:READ J:IF J=15 THEN 180
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| 160 S(X+1,Y+1)=J:GOTO 200
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| 180 RESTORE:READ S(X+1,Y+1)
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| 200 NEXT Y: NEXT X
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| 230 FOR X=0 TO 7:FOR Y=0 TO 7:IF S(X+1,Y+1)>-1 THEN 350
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| 310 IF S(X+1,Y+1)=-1 THEN FOR A=-1 TO 1 STEP 2:B=G:GOSUB 650:NEXT A
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| 330 IF S(X+1,Y+1)=-2 THEN FOR A=-1 TO 1 STEP 2:FOR B=-1 TO 1 STEP 2:GOSUB 650:NEXT B: NEXT A
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| 350 NEXT Y: NEXT X:GOTO 1140
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| 650 U=X+A:V=Y+B:IF U<0 OR U>7 OR V<0 OR V>7 THEN 870
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| 740 IF S(U+1,V+1)=0 THEN GOSUB 910:GOTO 870
|
| 770 IF S(U+1,V+1)<0 THEN 870
|
| 790 U=U+A:V=V+B:IF U<0 OR V<0 OR U>7 OR V>7 THEN 870
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| 850 IF S(U+1,V+1)=0 THEN GOSUB 910
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| 870 RETURN
|
| 910 IF V=0 AND S(X+1,Y+1)=-1 THEN Q=Q+2
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| 920 IF ABS(Y-V)=2 THEN Q=Q+5
|
| 960 IF Y=7 THEN Q=Q-2
|
| 980 IF U=0 OR U=7 THEN Q=Q+1
|
| 1030 FOR C=-1 TO 1 STEP 2:IF U+C<0 OR U+C>7 OR V+G<0 THEN 1080
|
| 1035 IF S(U+C+1,V+G+1)<0 THEN Q=Q+1:GOTO 1080
|
| 1040 IF U-C<0 OR U-C>7 OR V-G>7 THEN 1080
|
| 1045 IF S(U+C+1,V+G+1)>0 AND(S(U-C+1,V-G+1)=0 OR(U-C=X AND V-G=Y))THEN Q=Q-2
|
| 1080 NEXT C:IF Q>R(0+1)THEN R(0+1)=Q:R(1+1)=X:R(2+1)=Y:R(3+1)=U:R(4+1)=V
|
| 1100 Q=0:RETURN
|
| 1140 IF R(0+1)=-99 THEN 1880
|
| 1230 PRINT "FROM ";R(1+1),R(2+1);" TO ";R(3+1),R(4+1);:R(0+1)=-99
|
| 1240 IF R(4+1)=0 THEN S(R(3+1)+1,R(4+1)+1)=-2:GOTO 1420
|
| 1250 S(R(3+1)+1,R(4+1)+1)=S(R(1+1)+1,R(2+1)+1)
|
| 1310 S(R(1+1)+1,R(2+1)+1)=0:IF ABS(R(1+1)-R(3+1))<>2 THEN 1420
|
| 1330 S((R(1+1)+R(3+1))/2+1,(R(2+1)+R(4+1))/2+1)=0
|
| 1340 X=R(3+1):Y=R(4+1):IF S(X+1,Y+1)=-1 THEN B=-2:FOR A=-2 TO 2 STEP 4:GOSUB 1370
|
| 1350 IF S(X+1,Y+1)=-2 THEN FOR A=-2 TO 2 STEP 4:FOR B=-2 TO 2 STEP 4:GOSUB 1370:NEXT B
|
| 1360 NEXT A:IF R(0+1)<>-99 THEN PRINT"TO ";R(3+1),R(4+1);:R(0+1)=-99:GOTO 1240
|
| 1365 GOTO 1420
|
| 1370 U=X+A:V=Y+B:IF U<0 OR U>7 OR V<0 OR V>7 THEN 1400
|
| 1380 IF S(U+1,V+1)=0 AND S(X+A/2+1,Y+B/2+1)>0 THEN GOSUB 910
|
| 1400 RETURN
|
| 1420 PRINT:PRINT:PRINT:FOR Y=7 TO 0 STEP-1:FOR X=0 TO 7:I=5*X: TAB I
|
| 1430 IF S(X+1,Y+1)=0 THEN PRINT".";
|
| 1470 IF S(X+1,Y+1)=1 THEN PRINT"O";
|
| 1490 IF S(X+1,Y+1)=-1 THEN PRINT"X";
|
| 1510 IF S(X+1,Y+1)=-2 THEN PRINT"X*";
|
| 1530 IF S(X+1,Y+1)=2 THEN PRINT"O*";
|
| 1550 NEXT X:PRINT" ":PRINT:NEXT Y:PRINT
|
| 1552 FOR L=0 TO 7
|
| 1554 FOR M=0 TO 7
|
| 1556 IF S(L+1,M+1)=1 OR S(L+1,M+1)=2 THEN Z=1
|
| 1558 IF S(L+1,M+1)=-1 OR S(L+1,M+1)=-2 THEN T=1
|
| 1560 NEXT M
|
| 1562 NEXT L
|
| 1564 IF Z<>1 THEN 1885
|
| 1566 IF T<>1 THEN 1880
|
| 1570 Z=0: T=0
|
| 1590 PRINT "FROM";: GOSUB 5000: E=TX: H=TY: X=E:Y=H:IF S(X+1,Y+1)<=0 THEN 1590
|
| 1670 PRINT "TO";: GOSUB 5000: A=TX: B=TY:X=A:Y=B
|
| 1680 IF S(X+1,Y+1)=0 AND ABS(A-E)<=2 AND ABS(A-E)=ABS(B-H)THEN 1700
|
| 1690 GOTO 1670
|
| 1700 I=46
|
| 1750 S(A+1,B+1)=S(E+1,H+1):S(E+1,H+1)=0:IF ABS(E-A)<>2 THEN 1810
|
| 1800 S((E+A)/2+1,(H+B)/2+1)=0
|
| 1802 PRINT "+TO";: GOSUB 5000: A1=TX: B1=TY:IF A1<0 THEN 1810
|
| 1804 IF S(A1+1,B1+1)<>0 OR ABS(A1-A)<>2 OR ABS(B1-B)<>2 THEN 1802
|
| 1806 E=A:H=B:A=A1:B=B1:I=I+15:GOTO 1750
|
| 1810 IF B=7 THEN S(A+1,B+1)=2
|
| 1830 GOTO 230
|
| 1880 PRINT: PRINT "YOU WIN.": END
|
| 1885 PRINT: PRINT "I WIN.": END
|
| 5000
|
| 5010
|
| 5020 INPUT N$ : IF N$="#" THEN END
|
| 5030 @S=0: TX=VAL(N$): IF @S<>0 THEN PRINT "ERROR": GOTO 5020
|
| 5040 TC=INSTR(N$, ","): IF TC=0 THEN PRINT "ERROR": GOTO 5020
|
| 5050 TY=VAL(N$(TC+1)): IF @S<>0 THEN PRINT "ERROR": GOTO 5020
|
| 5060 RETURN
|
|
|
