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DEFINT A-Z
DECLARE SUB SQUARE (A, B, C)
DECLARE SUB SHOWMAN (A, B, FLAG)
DECLARE SUB SHOWBD ()
DECLARE SUB IO (A, B, X, Y, RESULT)
DECLARE FUNCTION INCHECK (X)
DECLARE SUB MAKEMOVE (A, B, X, Y)
DECLARE SUB KNIGHT (A, B, XX(), YY(), NDX)
DECLARE SUB KING (A, B, XX(), YY(), NDX)
DECLARE SUB QUEEN (A, B, XX(), YY(), NDX)
DECLARE SUB ROOK (A, B, XX(), YY(), NDX)
DECLARE SUB BISHOP (A, B, XX(), YY(), NDX)
DECLARE SUB MOVELIST (A, B, XX(), YY(), NDX)
DECLARE SUB PAWN (A, B, XX(), YY(), NDX)
DECLARE FUNCTION EVALUATE (ID, PRUNE)
DIM SHARED BOARD(0 TO 7, 0 TO 7)
DIM SHARED BESTA(0 TO 7), BESTB(0 TO 7), BESTX(0 TO 7), BESTY(0 TO 7)
DIM SHARED LEVEL, MAXLEVEL, SCORE, CFLAG
CFLAG = 0
LEVEL = 0
MAXLEVEL = 5
DATA -500,-270,-300,-900,-7500,-300,-270,-500
DATA -100,-100,-100,-100, -100,-100,-100,-100
DATA 0, 0, 0, 0, 0, 0, 0, 0
DATA 0, 0, 0, 0, 0, 0, 0, 0
DATA 0, 0, 0, 0, 0, 0, 0, 0
DATA 0, 0, 0, 0, 0, 0, 0, 0
DATA 100, 100, 100, 100, 100, 100, 100, 100
DATA 500, 270, 300, 900, 5000, 300, 270, 500
FOR X = 0 TO 7
  FOR Y = 0 TO 7
    READ Z
    BOARD(X, Y) = Z
  NEXT Y
NEXT X
A = -1
RESULT = 0
DO
  SCORE = 0
  CALL IO(A, B, X, Y, RESULT)
  CLS
  CALL SHOWBD
  RESULT = EVALUATE(-1, 10000)
  A = BESTA(1)
  B = BESTB(1)
  X = BESTX(1)
  Y = BESTY(1)
LOOP

SUB BISHOP (A, B, XX(), YY(), NDX)
  ID = SGN(BOARD(B, A))
  FOR DXY = 1 TO 7
    X = A - DXY
    Y = B + DXY
    IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
    GOSUB 3
    IF BOARD(Y, X) THEN EXIT FOR
  NEXT
  FOR DXY = 1 TO 7
    X = A + DXY
    Y = B + DXY
    IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
    GOSUB 3
    IF BOARD(Y, X) THEN EXIT FOR
  NEXT
  FOR DXY = 1 TO 7
    X = A - DXY
    Y = B - DXY
    IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
    GOSUB 3
    IF BOARD(Y, X) THEN EXIT FOR
  NEXT
  FOR DXY = 1 TO 7
    X = A + DXY
    Y = B - DXY
    IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
    GOSUB 3
    IF BOARD(Y, X) THEN EXIT FOR
  NEXT
  EXIT SUB
3 REM
  IF ID <> SGN(BOARD(Y, X)) THEN
    NDX = NDX + 1
    XX(NDX) = X
    YY(NDX) = Y
  END IF
  RETURN
END SUB

FUNCTION EVALUATE (ID, PRUNE)
  DIM XX(0 TO 26), YY(0 TO 26)
  LEVEL = LEVEL + 1
  BESTSCORE = 10000 * ID
  FOR B = 7 TO 0 STEP -1
    FOR A = 7 TO 0 STEP -1
      IF SGN(BOARD(B, A)) <> ID THEN GOTO 1
      IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 8)
      CALL MOVELIST(A, B, XX(), YY(), NDX)
      FOR I = 0 TO NDX
        X = XX(I)
        Y = YY(I)
        IF LEVEL = 1 THEN
          LOCATE 1, 1
          PRINT "TRYING: "; CHR$(65 + A); 8 - B; "-"; CHR$(65 + X); 8 - Y
          CALL SHOWMAN(X, Y, 8)
        END IF
        OLDSCORE = SCORE
        MOVER = BOARD(B, A)
        TARGET = BOARD(Y, X)
        CALL MAKEMOVE(A, B, X, Y)
        IF (LEVEL < MAXLEVEL) THEN SCORE = SCORE + EVALUATE(-ID, BESTSCORE - TARGET + ID * (8 - ABS(4 - X) - ABS(4 - Y)))
        SCORE = SCORE + TARGET - ID * (8 - ABS(4 - X) - ABS(4 - Y))
        IF (ID < 0 AND SCORE > BESTSCORE) OR (ID > 0 AND SCORE < BESTSCORE) THEN
          BESTA(LEVEL) = A
          BESTB(LEVEL) = B
          BESTX(LEVEL) = X
          BESTY(LEVEL) = Y
          BESTSCORE = SCORE
          IF (ID < 0 AND BESTSCORE >= PRUNE) OR (ID > 0 AND BESTSCORE <= PRUNE) THEN
            BOARD(B, A) = MOVER
            BOARD(Y, X) = TARGET
            SCORE = OLDSCORE
            IF (LEVEL = 1) THEN CALL SHOWMAN(X, Y, 0)
            IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 0)
            LEVEL = LEVEL - 1
            EVALUATE = BESTSCORE
            EXIT FUNCTION
          END IF
        END IF
        BOARD(B, A) = MOVER
        BOARD(Y, X) = TARGET
        SCORE = OLDSCORE
        IF (LEVEL = 1) THEN CALL SHOWMAN(X, Y, 0)
1   NEXT
      IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 0)
   NEXT
    NEXT
    LEVEL = LEVEL - 1
    EVALUATE = BESTSCORE
  END FUNCTION

FUNCTION INCHECK (X)
  DIM XX(0 TO 26), YY(0 TO 26), NDX
  FOR B = 0 TO 7
    FOR A = 0 TO 7
      IF BOARD(B, A) >= 0 THEN GOTO 6
      CALL MOVELIST(A, B, XX(), YY(), NDX)
      FOR I = 0 TO NDX STEP 1
        X = XX(I)
        Y = YY(I)
        IF BOARD(Y, X) = 5000 THEN
          PRINT "YOU ARE IN CHECK!"
          PRINT " "
          PRINT " "
          INCHECK = 1
          EXIT FUNCTION
        END IF
      NEXT
6 NEXT
    NEXT
    INCHECK = 0
  END FUNCTION

SUB IO (A, B, X, Y, RESULT)
  DIM XX(0 TO 26), YY(0 TO 26)
  CLS
  IF A >= 0 THEN
    IF RESULT < -2500 THEN
      PRINT "I RESIGN"
      SLEEP
      SYSTEM
    END IF
    PIECE = BOARD(Y, X)
    CALL MAKEMOVE(A, B, X, Y)
    PRINT "MY MOVE: "; CHR$(65 + A); 8 - B; "-"; CHR$(65 + X); 8 - Y
    IF PIECE THEN
      PRINT "I TOOK YOUR ";
      IF PIECE = 100 THEN PRINT "PAWN"
      IF PIECE = 270 THEN PRINT "KNIGHT"
      IF PIECE = 300 THEN PRINT "BISHOP"
      IF PIECE = 500 THEN PRINT "ROOK"
      IF PIECE = 900 THEN PRINT "QUEEN"
      IF PIECE = 5000 THEN PRINT "KING"
    END IF
    NULL = INCHECK(0)
  END IF
  DO
    CALL SHOWBD
    LOCATE 24, 1
    INPUT "YOUR MOVE: ", IN$
    IF UCASE$(IN$) = "QUIT" THEN CLS : END
    IF UCASE$(IN$) = "O-O" OR IN$ = "0-0" THEN
      IF CFLAG THEN GOTO 16
      IF BOARD(7, 7) <> 500 THEN GOTO 16
      IF BOARD(7, 6) OR BOARD(7, 5) THEN GOTO 16
      BOARD(7, 6) = 5000
      BOARD(7, 4) = 0
      BOARD(7, 5) = 500
      BOARD(7, 7) = 0
      CFLAG = 1
      EXIT SUB
    END IF
    IF UCASE$(IN$) = "O-O-O" OR IN$ = "0-0-0" THEN
      IF CFLAG THEN GOTO 16
      IF BOARD(7, 0) <> 500 THEN GOTO 16
      IF BOARD(7, 1) OR BOARD(7, 2) OR BOARD(7, 3) THEN GOTO 16
      BOARD(7, 2) = 5000
      BOARD(7, 4) = 0
      BOARD(7, 3) = 500
      BOARD(7, 0) = 0
      CFLAG = 1
      EXIT SUB
    END IF
    IF LEN(IN$) < 5 THEN GOTO 16
    B = 8 - (ASC(MID$(IN$, 2, 1)) - 48)
    A = ASC(UCASE$(MID$(IN$, 1, 1))) - 65
    X = ASC(UCASE$(MID$(IN$, 4, 1))) - 65
    Y = 8 - (ASC(MID$(IN$, 5, 1)) - 48)
    IF B > 7 OR B < 0 OR A > 7 OR A < 0 OR X > 7 OR X < 0 OR Y > 7 OR Y < 0 THEN GOTO 16
    IF BOARD(B, A) <= 0 THEN GOTO 16
    CALL MOVELIST(A, B, XX(), YY(), NDX)
    FOR K = 0 TO NDX STEP 1
      IF X = XX(K) AND Y = YY(K) THEN
        MOVER = BOARD(B, A)
        TARGET = BOARD(Y, X)
        CALL MAKEMOVE(A, B, X, Y)
        LOCATE 1, 1
        IF INCHECK(0) = 0 THEN EXIT SUB
        BOARD(B, A) = MOVER
        BOARD(Y, X) = TARGET
        GOTO 16
      END IF
    NEXT
16 CLS
  LOOP
END SUB

SUB KING (A, B, XX(), YY(), NDX)
  ID = SGN(BOARD(B, A))
  FOR DY = -1 TO 1
    IF B + DY < 0 OR B + DY > 7 THEN GOTO 12
    FOR DX = -1 TO 1
      IF A + DX < 0 OR A + DX > 7 THEN GOTO 11
      IF ID <> SGN(BOARD(B + DY, A + DX)) THEN
        NDX = NDX + 1
        XX(NDX) = A + DX
        YY(NDX) = B + DY
      END IF
11 NEXT
12 NEXT
    END SUB

SUB KNIGHT (A, B, XX(), YY(), NDX)
  ID = SGN(BOARD(B, A))
  X = A - 1
  Y = B - 2
  GOSUB 5
  X = A - 2
  Y = B - 1
  GOSUB 5
  X = A + 1
  Y = B - 2
  GOSUB 5
  X = A + 2
  Y = B - 1
  GOSUB 5
  X = A - 1
  Y = B + 2
  GOSUB 5
  X = A - 2
  Y = B + 1
  GOSUB 5
  X = A + 1
  Y = B + 2
  GOSUB 5
  X = A + 2
  Y = B + 1
  GOSUB 5
  EXIT SUB
5 IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN RETURN
  IF ID <> SGN(BOARD(Y, X)) THEN NDX = NDX + 1: XX(NDX) = X: YY(NDX) = Y
  RETURN
END SUB

SUB MAKEMOVE (A, B, X, Y)
  BOARD(Y, X) = BOARD(B, A)
  BOARD(B, A) = 0
  IF Y = 0 AND BOARD(Y, X) = 100 THEN BOARD(Y, X) = 900
  IF Y = 7 AND BOARD(Y, X) = -100 THEN BOARD(Y, X) = -900
END SUB

SUB MOVELIST (A, B, XX(), YY(), NDX)
  PIECE = INT(ABS(BOARD(B, A)))
  NDX = -1
  IF PIECE = 100 THEN
    CALL PAWN(A, B, XX(), YY(), NDX)
  ELSEIF PIECE = 270 THEN CALL KNIGHT(A, B, XX(), YY(), NDX)
  ELSEIF PIECE = 300 THEN CALL BISHOP(A, B, XX(), YY(), NDX)
  ELSEIF PIECE = 500 THEN CALL ROOK(A, B, XX(), YY(), NDX)
  ELSEIF PIECE = 900 THEN CALL QUEEN(A, B, XX(), YY(), NDX)
  ELSE CALL KING(A, B, XX(), YY(), NDX)
  END IF

END SUB

SUB PAWN (A, B, XX(), YY(), NDX)
  ID = SGN(BOARD(B, A))
  IF (A - 1) >= 0 AND (A - 1) <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
    IF SGN(BOARD((B - ID), (A - 1))) = -ID THEN
      NDX = NDX + 1
      XX(NDX) = A - 1
      YY(NDX) = B - ID
    END IF
  END IF
  IF (A + 1) >= 0 AND (A + 1) <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
    IF SGN(BOARD((B - ID), (A + 1))) = -ID THEN
      NDX = NDX + 1
      XX(NDX) = A + 1
      YY(NDX) = B - ID
    END IF
  END IF
  IF A >= 0 AND A <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
    IF BOARD((B - ID), A) = 0 THEN
      NDX = NDX + 1
      XX(NDX) = A
      YY(NDX) = B - ID
      IF (ID < 0 AND B = 1) OR (ID > 0 AND B = 6) THEN
        IF BOARD((B - ID - ID), A) = 0 THEN
          NDX = NDX + 1
          XX(NDX) = A
          YY(NDX) = B - 2 * ID
        END IF
      END IF
    END IF
  END IF

END SUB

SUB QUEEN (A, B, XX(), YY(), NDX)
  CALL BISHOP(A, B, XX(), YY(), NDX)
  CALL ROOK(A, B, XX(), YY(), NDX)
END SUB

SUB ROOK (A, B, XX(), YY(), NDX)
  ID = SGN(BOARD(B, A))
  FOR X = A - 1 TO 0 STEP -1
    IF ID <> SGN(BOARD(B, X)) THEN
      NDX = NDX + 1
      XX(NDX) = X
      YY(NDX) = B
    END IF
    IF (BOARD(B, X)) THEN EXIT FOR
  NEXT
  FOR X = A + 1 TO 7 STEP 1
    IF ID <> SGN(BOARD(B, X)) THEN
      NDX = NDX + 1
      XX(NDX) = X
      YY(NDX) = B
    END IF
    IF (BOARD(B, X)) THEN EXIT FOR
  NEXT
  FOR Y = B - 1 TO 0 STEP -1
    IF ID <> SGN(BOARD(Y, A)) THEN
      NDX = NDX + 1
      XX(NDX) = A
      YY(NDX) = Y
    END IF
    IF (BOARD(Y, A)) THEN EXIT FOR
  NEXT
  FOR Y = B + 1 TO 7 STEP 1
    IF ID <> SGN(BOARD(Y, A)) THEN
      NDX = NDX + 1
      XX(NDX) = A
      YY(NDX) = Y
    END IF
    IF (BOARD(Y, A)) THEN EXIT FOR
  NEXT
END SUB

SUB SHOWBD
  LOCATE 3, 30
  COLOR 7, 0
  PRINT "A  B  C  D  E  F  G  H"
  FOR K = 0 TO 25
    LOCATE 4, 28 + K
    COLOR 6, 0
    PRINT CHR$(220)
  NEXT
  FOR B = 0 TO 7
    LOCATE 2 * B + 5, 26
    COLOR 7, 0
    PRINT CHR$(56 - B)
    LOCATE 2 * B + 5, 28
    COLOR 6, 0
    PRINT CHR$(219)
    LOCATE 2 * B + 6, 28
    COLOR 6, 0
    PRINT CHR$(219)
    FOR A = 0 TO 7
      IF ((A + B) MOD 2) THEN
        COLOUR = 8
      ELSE COLOUR = 12
      END IF
      CALL SQUARE(3 * A + 31, 2 * B + 5, COLOUR)
    NEXT
    LOCATE 2 * B + 5, 53
    COLOR 6, 0
    PRINT CHR$(219)
    LOCATE 2 * B + 6, 53
    COLOR 6, 0
    PRINT CHR$(219)
    LOCATE 2 * B + 6, 55
    COLOR 7, 0
    PRINT CHR$(56 - B)
  NEXT
  FOR K = 0 TO 25
    LOCATE 21, 28 + K
    COLOR 6, 0
    PRINT CHR$(223)
  NEXT
  LOCATE 22, 30
  COLOR 7, 0
  PRINT "A  B  C  D  E  F  G  H"
  FOR B = 0 TO 7
    FOR A = 0 TO 7
      CALL SHOWMAN(A, B, 0)
    NEXT
  NEXT
  COLOR 7, 0
END SUB

SUB SHOWMAN (A, B, FLAG)
  IF BOARD(B, A) < 0 THEN BACK = 0
  IF BOARD(B, A) > 0 THEN BACK = 7
  FORE = 7 - BACK + FLAG
  IF BOARD(B, A) = 0 THEN
    IF (A + B) AND 1 THEN BACK = 8 ELSE BACK = 12
    FORE = BACK - (FLAG > 0)
  END IF
  N$ = " "
  PIECE = INT(ABS(BOARD(B, A)))
  IF PIECE = 0 THEN N$ = CHR$(219)
  IF PIECE = 100 THEN N$ = "P"
  IF PIECE = 270 THEN N$ = "N"
  IF PIECE = 300 THEN N$ = "B"
  IF PIECE = 500 THEN N$ = "R"
  IF PIECE = 900 THEN N$ = "Q"
  IF PIECE = 5000 OR PIECE = 7500 THEN N$ = "K"
  LOCATE 2 * B + 5 - (BOARD(B, A) > 0), 3 * A + 30
  COLOR FORE, BACK
  PRINT N$
  LOCATE 1, 1
  COLOR 7, 0
END SUB

SUB SQUARE (A, B, C)
  MT$ = CHR$(219)
  MT$ = MT$ + MT$ + MT$
  LOCATE B, A - 2
  COLOR C, C
  PRINT MT$
  LOCATE B + 1, A - 2
  COLOR C, C
  PRINT MT$
  COLOR 7, 0
END SUB

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