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81 lines
4.1 KiB
QBasic
81 lines
4.1 KiB
QBasic
1 ! BY JEFF DALTON, CLASS OF '74, NORTHFIELD MOUNT HERMON SCHOOL
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2 ! THIS PROGRAM PLAYS THE GAME 'HEXAPAWN' BY A METHOD OUTLINED IN
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'MATHEMATICAL GAMES' IN MARCH 1962 SCIENTIFIC AMERICAN.
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3 ! THE PROGRAM LEARNS BY ELIMINATION OF BAD MOVES. ALL POSITIONS
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ENCOUNTERED BY THE PROGRAM AND THE ACCEPTABLE MOVES FROM THEM
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ARE STORED IN P$(I%)
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4 ! WHEN THE PROGRAM ENCOUNTERS AN UNFAMILIAR POSITION, THE POSITION
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AND ALL LEGAL MOVES FROM IT ARE ADDED TO THE LIST.
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5 ! IF THE PROGRAM LOSES A GAME, IT ERASES THE MOVE THAT LED TO DEFEAT.
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IF IT HITS A POSITION FROM WHICH ALL MOVES HAVE BEEN DELETED
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( THEY ALL LED TO DEFEAT ), IT ERASES THE MOVE THAT GOT
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IT HERE AND RESIGNS.
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10 INPUT "INSTRUCTIONS"; C$: IF LEFT(C$,1%)<>"Y" THEN 110
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20 &: &,"THIS PROGRAM PLAYS THE GAME OF HEXAPAWN.":&
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"HEXAPAWN IS PLAYED WITH CHESS PAWNS ON A 3 BY 3 BOARD. THE PAWNS ARE":&
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"MOVED AS IN CHESS - ONE SPACE FORWARD TO AN EMPTY SPACE OR ONE SPACE"
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30 &"FORWARD AND DIAGONALLY TO CAPTURE AN OPPOSING MAN.":&:&CHR$(9%);
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"O THE BOARD, YOUR PAWNS ARE 'O', THE COMPUTER'S PAWNS ARE '*'":&
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"AND EMPTY SQUARES ARE '-'. TO ENTER A MOVE, TYPE THE NUMBER OF THE"
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40 &"SQUARE YOU WILL MOVE FROM FOLLOWED BY THE NUMBER OF THE SQUARE":&
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"YOU WILL MOVE TO. (THE NUMBERS ARE SEPARATED BY A COMMA.)":&
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50 &" THE PROGRAM STARTS A SERIS OF GAMES KNOWING ONLY WHEN THE":&
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"GAME IS WON (A DRAW IS IMPOSSIBLE) AND HOW TO MOVE. IT HAS NO":&
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"STRATEGY AT FIRST AND JUST MOVES RANDOMLY. HOWEVER, IT LEARNS"
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60 &"FROM EACH GAME. THUS, DEFEATING IT BECOMES MORE AND MORE":&
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"DIFFICULT. ALSO, TO HELP OFFSET YOUR INITIAL ADVANTAGE, YOU WILL":&
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"NOT BE TOLD HOW TO WIN THE GAME BUT MUST LEARN THIS BY PLAYING":&
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100 DEF FNC$(X$,X%,Y$)=LEFT(X$,X%-1%)+Y$+RIGHT(X$,X%+LEN(Y$))
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105 DEF FNN$(X%): X$=NUM$(X%): FNN$=MID(X$,2%,LEN(X$)-2%): FNEND
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110 DIM P$(50%): RANDOMIZE: Q%=0%:
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PRINT "SINCE I'M A GOOD SPORT, YOU'LL ALWAYS GO FIRST
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120 P%=0%: P$="***---OOO": &: &"NUMBERING:":
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&"123": &"456": &"789": &
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190 D%=-1%: Q$="O": GOSUB 2000: IF M$="" THEN
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PRINT "YOU CAN'T MOVE. I WIN.": GOTO 510
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200 &: &"BOARD:": &LEFT(P$,3%): &MID(P$,4%,3%): &RIGHT(P$,7%): &
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210 INPUT "WHAT IS YOUR MOVE"; A%,B%:
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IF INSTR(1%,M$,FNN$(A%)+FNN$(B%))=0% THEN
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PRINT "ILLEGAL MOVE.": GOTO 210
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230 P$=FNC$(FNC$(P$,A%,"-"),B%,"O"):
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IF INSTR(1%,P$,"*")=0% OR INSTR(1%,P$,"O")<4% THEN
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PRINT "YOU WIN.": GOTO 500
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300 P%=P%+2% ! COMPUTER'S MOVE
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310 FOR C%=1% TO Q%: C$=P$(C%): IF VAL(LEFT(C$,1%))=P% AND
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MID(C$,2%,9%)=P$ THEN M$=RIGHT(C$,11%) GOTO 400
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320 NEXT C%: Q$="*": D%=1%: GOSUB 2000: C%=Q%:
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IF M$="" THEN PRINT "I CAN'T MOVE, YOU WIN.": GOTO 500
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400 IF M$="" THEN PRINT "I RESIGN.": GOTO 500
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410 K$=LEFT(M$,2%): M$=RIGHT(M$,3%):
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IF RND>.33333333 AND M$<>"" THEN 410
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420 K%=C%: A%=VAL(LEFT(K$,1%)): B%=VAL(RIGHT(K$,2%)):
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P$=FNC$(FNC$(P$,A%,"-"),B%,"*")
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430 IF INSTR(1%,P$,"O")=0% OR INSTR(7%,P$,"*") THEN
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PRINT "I WIN!": GOTO 510
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440 PRINT "I MOVE FROM" A% "TO" B%: GOTO 190
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500 W2%=W2%+1%: I%=INSTR(11%,P$(K%),K$):
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P$(K%)=LEFT(P$(K%),I%-1%)+RIGHT(P$(K%),I%+2%) IF I%: GOTO 520
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510 W1%=W1%+1%
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520 &: &"BOARD:": &LEFT(P$,3%): &MID(P$,4%,3%): &RIGHT(P$,7%): &:
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& "I HAVE WON" W1% "AND YOU HAVE WON" W2% "OF" W1%+W2% "GAMES"
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530 INPUT "ANOTHER GAME"; C$: IF C$="NO" THEN 9999 ELSE 120
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900 ! DATA**= <- OF MOVE IN GAME><POSITION><LIST OF MOVES>
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IN <POSITION>, -=BLANK, *=COMPUTER'S PAWN, O=PLAYERS'S PAWN
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<LIST OF MOVES> IS <- MOVE FROM><- MOVE TO><LIST OF MOVES>
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2000 M$=""
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2010 FOR J%=1% TO 9%: IF MID(P$,J%,1%)<>Q$ THEN 2050
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2015 T%=J%+D%*3%: IF T%<1% OR T%>9% THEN 2025
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2020 IF MID(P$,T%,1%)="-" THEN
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M$=M$+FNN$(J%)+FNN$(T%)
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2025 T%=J%+D%*2%: IF T%<1% OR T%>9% OR
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(D%=1% AND (J%=1% OR J%=4% OR J%=7%)) OR
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(D%=-1% AND (J%=3% OR J%=6% OR J%=9%)) THEN 2035
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2030 IF INSTR(1%,Q$+"-",MID(P$,T%,1%))=0% THEN
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M$=M$+FNN$(J%)+FNN$(T%)
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2035 T%=J%+D%*4%: IF T%<1% OR T%>9% OR J%=3% OR J%=7% THEN 2050
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2040 IF INSTR(1%,Q$+"-", MID(P$,T%,1%))=0% THEN
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M$=M$+FNN$(J%)+FNN$(T%)
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2050 NEXT J%: IF D%=1% AND M$<>"" THEN Q%=Q%+1%: P$(Q%)=FNN$(P%)+P$+M$
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2060 RETURN
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9999 END
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