10 PRINT\PRINT "WELCOME TO THE ORIENTAL GAME OF GOMOKU"
20 PRINT\PRINT "THE GAME IS PLAYED ON AN N BY N GRID OF A SIZE"
30 PRINT "THAT YOU SPECIFY.  DURING YOUR PLAY, YOU MAY COVER ONE GRID"
40 PRINT "INTERSECTION WITH A MARKER.  THE OBJECT OF THE GAME IS TO GET"
50 PRINT "5 ADJACENT MARKERS IN A ROW -- HORIZONTALLY, VERTICALLY, OR"
60 PRINT "ALONG EITHER DIAGONAL.  ON THE BOARD DIAGRAM, YOUR MOVES ARE"
70 PRINT "MARKED WITH A '1', AND THE COMPUTER MOVES WITH A '2'."
80 PRINT\PRINT "THE COMPUTER DOES NOT KEEP TRACK OF WHO HAS WON."
90 PRINT "TO END THE GAME, TYPE '-1,-1' FOR YOUR MOVE"\PRINT
110 PRINT "WHAT IS YOUR BOARD SIZE (MIN =7, MAX = 19)";\INPUT N
115 IF N>6 THEN 117
116 GOTO 120
117 IF N<20 THEN 300
120 PRINT "I SAID, THE MINIMUM SIZE IS 7, AND THE MAXIMUM IS 19."\GOTO 110
210 FOR I=1 TO N\FOR J=1 TO N\A(X,Y)=0\NEXT J\NEXT I
300 PRINT\PRINT "WE ALTERNATE MOVES.  YOU GO FIRST..."\PRINT
310 PRINT "YOUR PLAY (I,J)";\INPUT I,J
320 IF I=-1 THEN 980
330 X=I\Y=J\GOSUB 910\IF L=1 THEN 410
340 PRINT "ILLEGAL MOVE. TRY AGAIN..."\GOTO 310
410 IF A(I,J)=0 THEN 440
420 PRINT "SQUARE OCCUPIED. TRY AGAIN..."\GOTO 310
440 A(I,J)=1
500 REM *** COMPUTER TRIES AN 'INTELLIGENT' MOVE ***
510 FOR E=-1 TO 1\FOR F=-1 TO 1\IF E+F-E*F=0 THEN 590 
540 LET X=I+E\LET Y=J+F\GOSUB 910 
570 IF L=0 THEN 590
580 IF A(X,Y)=1 THEN 710
590 NEXT F\NEXT E
600 REM *** COMPUTER TRIES A RANDOM MOVE ***
610 LET X=INT(N*RND(0))+1\LET Y=INT(RND(0))+1\GOSUB 910\IF L=0 THEN 610
650 IF A(X,Y)<>0 THEN 610
660 A(X,Y)=2\GOSUB 810\GOTO 310
710 X=I-E\Y=J-F\GOSUB 910
750 IF L=0 THEN 610
760 GOTO 650
800 REM *** PRINT THE BOARD ***
810 FOR I=1 TO N\FOR J=1 TO N\PRINT A(I,J);
840 NEXT J\PRINT \NEXT I\PRINT \RETURN
900 REM *** CHECK WHETHER MOVE IS LEGAL ***
910 L=1\IF X<1 THEN 970
920 IF X>N THEN 970
930 IF Y<1 THEN 970
940 IF Y>N THEN 970
950 RETURN
970 LET L=0\RETURN
980 PRINT\PRINT "THANKS FOR THE GAME!!"
985 PRINT "PLAY AGAIN (1 FOR YES, 0 FOR NO)";\INPUT Q
990 IF Q=1 THEN 110
999 END