mirror of
https://github.com/QB64Official/qb64.git
synced 2024-08-22 04:25:08 +00:00
543 lines
No EOL
14 KiB
QBasic
543 lines
No EOL
14 KiB
QBasic
DEFINT A-Z
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DECLARE SUB SQUARE (A, B, C)
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DECLARE SUB SHOWMAN (A, B, FLAG)
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DECLARE SUB SHOWBD ()
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DECLARE SUB IO (A, B, X, Y, RESULT)
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DECLARE FUNCTION INCHECK (X)
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DECLARE SUB MAKEMOVE (A, B, X, Y)
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DECLARE SUB KNIGHT (A, B, XX(), YY(), NDX)
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DECLARE SUB KING (A, B, XX(), YY(), NDX)
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DECLARE SUB QUEEN (A, B, XX(), YY(), NDX)
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DECLARE SUB ROOK (A, B, XX(), YY(), NDX)
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DECLARE SUB BISHOP (A, B, XX(), YY(), NDX)
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DECLARE SUB MOVELIST (A, B, XX(), YY(), NDX)
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DECLARE SUB PAWN (A, B, XX(), YY(), NDX)
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DECLARE FUNCTION EVALUATE (ID, PRUNE)
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DIM SHARED BOARD(0 TO 7, 0 TO 7)
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DIM SHARED BESTA(0 TO 7), BESTB(0 TO 7), BESTX(0 TO 7), BESTY(0 TO 7)
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DIM SHARED LEVEL, MAXLEVEL, SCORE
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DIM SHARED WCKSFLAG, WCQSFLAG, INTFLAG
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DIM SHARED WCKSOLD, WCQSOLD
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LEVEL = 0
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MAXLEVEL = 5 'change this to higher to make it think ahead more
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DATA -500,-270,-300,-900,-7500,-300,-270,-500
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DATA -100,-100,-100,-100, -100,-100,-100,-100
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DATA 0, 0, 0, 0, 0, 0, 0, 0
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DATA 0, 0, 0, 0, 0, 0, 0, 0
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DATA 0, 0, 0, 0, 0, 0, 0, 0
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DATA 0, 0, 0, 0, 0, 0, 0, 0
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DATA 100, 100, 100, 100, 100, 100, 100, 100
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DATA 500, 270, 300, 900, 5000,300, 270, 500
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FOR X = 0 TO 7
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FOR Y = 0 TO 7
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READ Z
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BOARD(X, Y) = Z
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NEXT Y
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NEXT X
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A = -1
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RESULT = 0
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CLS
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LOCATE , 34
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PRINT "QBASIC CHESS"
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PRINT
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PRINT " CHESS is a game played between two players on a board of 64 squares."
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PRINT " Chess was first invented in its current form in Europe during the late"
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PRINT " fifteenth century. It evolved from much earlier forms invented in India"
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PRINT " and Persia."
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PRINT " The pieces are divided into Black and White. Each player has 16 pieces:"
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PRINT " 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns. White makes"
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PRINT " the first move. The players alternate moving one piece at a time. Pieces"
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PRINT " are moved to an unoccupied square, or moved onto a square occupied by an"
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PRINT " opponent's piece, capturing it. When the king is under attack, he is in"
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PRINT " CHECK. The player cannot put his king in check. The object is to CHECKMATE"
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PRINT " the opponent. This occurs when the king is in check and there is no way to"
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PRINT " remove the king from attack."
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PRINT " To move the pieces on the chessboard, type in your move in coordinate"
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PRINT " notation, e.g. E2-E4 (not in English notation like P-K4). To castle, type O-O"
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PRINT " to castle kingside or O-O-O to castle queenside like in English notation."
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PRINT " To exit the game, type QUIT."
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PRINT
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PRINT "Press any key to continue."
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Z$ = INPUT$(1)
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DO
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SCORE = 0
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CALL IO(A, B, X, Y, RESULT)
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CLS
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CALL SHOWBD
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RESULT = EVALUATE(-1, 10000)
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A = BESTA(1)
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B = BESTB(1)
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X = BESTX(1)
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Y = BESTY(1)
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LOOP
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SUB BISHOP (A, B, XX(), YY(), NDX)
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ID = SGN(BOARD(B, A))
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FOR DXY = 1 TO 7
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X = A - DXY
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Y = B + DXY
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IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
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GOSUB 3
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IF BOARD(Y, X) <> 0 THEN EXIT FOR
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NEXT
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FOR DXY = 1 TO 7
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X = A + DXY
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Y = B + DXY
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IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
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GOSUB 3
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IF BOARD(Y, X) <> 0 THEN EXIT FOR
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NEXT
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FOR DXY = 1 TO 7
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X = A - DXY
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Y = B - DXY
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IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
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GOSUB 3
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IF BOARD(Y, X) <> 0 THEN EXIT FOR
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NEXT
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FOR DXY = 1 TO 7
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X = A + DXY
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Y = B - DXY
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IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN EXIT FOR
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GOSUB 3
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IF BOARD(Y, X) <> 0 THEN EXIT FOR
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NEXT
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EXIT SUB
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3 REM
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IF ID <> SGN(BOARD(Y, X)) THEN
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NDX = NDX + 1
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XX(NDX) = X
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YY(NDX) = Y
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END IF
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RETURN
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END SUB
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FUNCTION EVALUATE (ID, PRUNE)
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DIM XX(0 TO 26), YY(0 TO 26)
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LEVEL = LEVEL + 1
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BESTSCORE = 10000 * ID
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FOR B = 7 TO 0 STEP -1
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FOR A = 7 TO 0 STEP -1
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IF SGN(BOARD(B, A)) <> ID THEN GOTO 1
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IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 8)
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CALL MOVELIST(A, B, XX(), YY(), NDX)
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FOR I = 0 TO NDX
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X = XX(I)
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Y = YY(I)
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IF LEVEL = 1 THEN
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LOCATE 1, 1
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PRINT "TRYING: "; CHR$(65 + A); 8 - B; "-"; CHR$(65 + X); 8 - Y
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CALL SHOWMAN(X, Y, 8)
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END IF
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OLDSCORE = SCORE
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MOVER = BOARD(B, A)
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TARGET = BOARD(Y, X)
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CALL MAKEMOVE(A, B, X, Y)
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IF (LEVEL < MAXLEVEL) THEN SCORE = SCORE + EVALUATE(-ID, BESTSCORE - TARGET + ID * (8 - ABS(4 - X) - ABS(4 - Y)))
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SCORE = SCORE + TARGET - ID * (8 - ABS(4 - X) - ABS(4 - Y))
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IF (ID < 0 AND SCORE > BESTSCORE) OR (ID > 0 AND SCORE < BESTSCORE) THEN
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BESTA(LEVEL) = A
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BESTB(LEVEL) = B
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BESTX(LEVEL) = X
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BESTY(LEVEL) = Y
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BESTSCORE = SCORE
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IF (ID < 0 AND BESTSCORE >= PRUNE) OR (ID > 0 AND BESTSCORE <= PRUNE) THEN
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BOARD(B, A) = MOVER
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BOARD(Y, X) = TARGET
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SCORE = OLDSCORE
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IF (LEVEL = 1) THEN CALL SHOWMAN(X, Y, 0)
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IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 0)
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LEVEL = LEVEL - 1
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EVALUATE = BESTSCORE
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EXIT FUNCTION
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END IF
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END IF
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BOARD(B, A) = MOVER
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BOARD(Y, X) = TARGET
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SCORE = OLDSCORE
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IF (LEVEL = 1) THEN CALL SHOWMAN(X, Y, 0)
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NEXT
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IF (LEVEL = 1) THEN CALL SHOWMAN(A, B, 0)
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1 NEXT
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NEXT
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LEVEL = LEVEL - 1
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EVALUATE = BESTSCORE
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END FUNCTION
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FUNCTION INCHECK (X)
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DIM XX(27), YY(27), NDX
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FOR B = 0 TO 7
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FOR A = 0 TO 7
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IF BOARD(B, A) >= 0 THEN GOTO 6
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CALL MOVELIST(A, B, XX(), YY(), NDX)
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FOR I = 0 TO NDX STEP 1
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X = XX(I)
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Y = YY(I)
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IF BOARD(Y, X) = 5000 THEN
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PRINT "YOU ARE IN CHECK!"
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PRINT " "
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PRINT " "
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INCHECK = 1
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EXIT FUNCTION
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END IF
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NEXT
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6 NEXT
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NEXT
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INCHECK = 0
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END FUNCTION
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SUB IO (A, B, X, Y, RESULT)
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DIM XX(0 TO 26), YY(0 TO 26)
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CLS
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IF A >= 0 THEN
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IF RESULT < -2500 THEN
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PRINT "I RESIGN"
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SLEEP
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SYSTEM
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END IF
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PIECE = BOARD(Y, X)
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CALL MAKEMOVE(A, B, X, Y)
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PRINT "MY MOVE: "; CHR$(65 + A); 8 - B; "-"; CHR$(65 + X); 8 - Y
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IF PIECE <> 0 THEN
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PRINT "I TOOK YOUR ";
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IF PIECE = 100 THEN PRINT "PAWN"
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IF PIECE = 270 THEN PRINT "KNIGHT"
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IF PIECE = 300 THEN PRINT "BISHOP"
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IF PIECE = 500 THEN PRINT "ROOK"
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IF PIECE = 900 THEN PRINT "QUEEN"
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IF PIECE = 5000 THEN PRINT "KING"
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END IF
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NULL = INCHECK(0)
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END IF
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DO
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CALL SHOWBD
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VIEW PRINT 24 TO 24
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INPUT "YOUR MOVE: ", IN$
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IF UCASE$(IN$) = "QUIT" THEN CLS : END
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IF UCASE$(IN$) = "O-O" OR IN$ = "0-0" THEN
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IF WCKSFLAG <> 0 THEN GOTO 16
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IF BOARD(7, 7) <> 500 THEN GOTO 16
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IF BOARD(7, 6) <> 0 OR BOARD(7, 5) <> 0 THEN GOTO 16
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BOARD(7, 6) = 5000
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BOARD(7, 4) = 0
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BOARD(7, 5) = 500
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BOARD(7, 7) = 0
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WCKSFLAG = -1
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EXIT SUB
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END IF
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IF UCASE$(IN$) = "O-O-O" OR IN$ = "0-0-0" THEN
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IF WCQSFLAG <> 0 THEN GOTO 16
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IF BOARD(7, 0) <> 500 THEN GOTO 16
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IF BOARD(7, 1) <> 0 OR BOARD(7, 2) <> 0 OR BOARD(7, 3) <> 0 THEN GOTO 16
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BOARD(7, 2) = 5000
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BOARD(7, 4) = 0
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BOARD(7, 3) = 500
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BOARD(7, 0) = 0
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WCQSFLAG = -1
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EXIT SUB
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END IF
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IF LEN(IN$) < 5 THEN GOTO 16
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B = 8 - (ASC(MID$(IN$, 2, 1)) - 48)
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A = ASC(UCASE$(MID$(IN$, 1, 1))) - 65
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X = ASC(UCASE$(MID$(IN$, 4, 1))) - 65
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Y = 8 - (ASC(MID$(IN$, 5, 1)) - 48)
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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
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IF BOARD(B, A) <= 0 THEN GOTO 16
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IF Y = 2 AND B = 3 AND (X = A - 1 OR X = A + 1) THEN
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IF BOARD(B, A) = 100 AND BOARD(Y, X) = 0 AND BOARD(Y + 1, X) = -100 THEN
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IF BESTB(1) = 1 AND BESTA(1) = X THEN
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MOVER = BOARD(B, A)
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TARGET = BOARD(Y, X)
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CALL MAKEMOVE(A, B, X, Y)
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BOARD(Y + 1, X) = 0
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ENPASSANT = -1
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GOTO 15
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END IF
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END IF
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END IF
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CALL MOVELIST(A, B, XX(), YY(), NDX)
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FOR K = 0 TO NDX STEP 1
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IF X = XX(K) AND Y = YY(K) THEN
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MOVER = BOARD(B, A)
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TARGET = BOARD(Y, X)
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INTFLAG = -1
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CALL MAKEMOVE(A, B, X, Y)
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IF MOVER = 5000 THEN
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WCQSOLD = WCQSFLAG
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WCKSOLD = WCKSFLAG
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WCKSFLAG = -1
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WCQSFLAG = -1
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END IF
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IF (A = 0) AND (B = 7) AND (MOVER = 500) THEN
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WCQSOLD = WCQSFLAG
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WCQSFLAG = -1
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END IF
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IF (A = 7) AND (B = 7) AND (MOVER = 500) THEN
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WCKSOLD = WCKSFLAG
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WCKSFLAG = -1
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END IF
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INTFLAG = 0
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15 IF INCHECK(0) = 0 THEN EXIT SUB
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BOARD(B, A) = MOVER
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BOARD(Y, X) = TARGET
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IF ENPASSANT THEN BOARD(Y + 1, X) = -100: ENPASSANT = 0
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IF (A = 0) AND (B = 7) AND (MOVER = 500) THEN WCQSFLAG = WCQSOLD
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IF (A = 7) AND (B = 7) AND (MOVER = 500) THEN WCKSFLAG = WCKSOLD
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IF MOVER = 5000 THEN WCQSFLAG = WCQSOLD
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GOTO 16
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END IF
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NEXT
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16 CLS
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LOOP
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END SUB
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SUB KING (A, B, XX(), YY(), NDX)
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ID = SGN(BOARD(B, A))
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FOR DY = -1 TO 1
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IF B + DY < 0 OR B + DY > 7 THEN GOTO 12
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FOR DX = -1 TO 1
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IF A + DX < 0 OR A + DX > 7 THEN GOTO 11
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IF ID <> SGN(BOARD(B + DY, A + DX)) THEN
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NDX = NDX + 1
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XX(NDX) = A + DX
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YY(NDX) = B + DY
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END IF
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11 NEXT
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12 NEXT
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END SUB
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SUB KNIGHT (A, B, XX(), YY(), NDX)
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ID = SGN(BOARD(B, A))
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X = A - 1
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Y = B - 2
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GOSUB 5
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X = A - 2
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Y = B - 1
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GOSUB 5
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X = A + 1
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Y = B - 2
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GOSUB 5
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X = A + 2
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Y = B - 1
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GOSUB 5
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X = A - 1
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Y = B + 2
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GOSUB 5
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X = A - 2
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Y = B + 1
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GOSUB 5
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X = A + 1
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Y = B + 2
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GOSUB 5
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X = A + 2
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Y = B + 1
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GOSUB 5
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EXIT SUB
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5 REM
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IF X < 0 OR X > 7 OR Y < 0 OR Y > 7 THEN RETURN
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IF ID <> SGN(BOARD(Y, X)) THEN NDX = NDX + 1: XX(NDX) = X: YY(NDX) = Y
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RETURN
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END SUB
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SUB MAKEMOVE (A, B, X, Y)
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BOARD(Y, X) = BOARD(B, A)
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BOARD(B, A) = 0
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IF Y = 0 AND BOARD(Y, X) = 100 THEN
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IF INTFLAG THEN
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DO
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VIEW PRINT 24 TO 24
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INPUT "PROMOTE TO: ", I$
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SELECT CASE UCASE$(I$)
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CASE "KNIGHT", "N", "Kt", "Kt.", "N."
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PROMOTE = 270
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CASE "BISHOP", "B", "B."
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PROMOTE = 300
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CASE "ROOK", "R", "R."
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PROMOTE = 500
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CASE "QUEEN", "Q", "Q."
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PROMOTE = 900
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END SELECT
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LOOP UNTIL PROMOTE <> 0
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BOARD(Y, X) = PROMOTE
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ELSE
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BOARD(Y, X) = -900
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END IF
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END IF
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IF Y = 7 AND BOARD(Y, X) = -100 THEN BOARD(Y, X) = -900
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END SUB
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SUB MOVELIST (A, B, XX(), YY(), NDX)
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PIECE = INT(ABS(BOARD(B, A)))
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NDX = -1
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IF PIECE = 100 THEN
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CALL PAWN(A, B, XX(), YY(), NDX)
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ELSEIF PIECE = 270 THEN CALL KNIGHT(A, B, XX(), YY(), NDX)
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ELSEIF PIECE = 300 THEN CALL BISHOP(A, B, XX(), YY(), NDX)
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ELSEIF PIECE = 500 THEN CALL ROOK(A, B, XX(), YY(), NDX)
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ELSEIF PIECE = 900 THEN CALL QUEEN(A, B, XX(), YY(), NDX)
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ELSE CALL KING(A, B, XX(), YY(), NDX)
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END IF
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END SUB
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SUB PAWN (A, B, XX(), YY(), NDX)
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ID = SGN(BOARD(B, A))
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IF (A - 1) >= 0 AND (A - 1) <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
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IF SGN(BOARD((B - ID), (A - 1))) = -ID THEN
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NDX = NDX + 1
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XX(NDX) = A - 1
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YY(NDX) = B - ID
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END IF
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END IF
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IF (A + 1) >= 0 AND (A + 1) <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
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IF SGN(BOARD((B - ID), (A + 1))) = -ID THEN
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NDX = NDX + 1
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XX(NDX) = A + 1
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YY(NDX) = B - ID
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END IF
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END IF
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IF A >= 0 AND A <= 7 AND (B - ID) >= 0 AND (B - ID) <= 7 THEN
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IF BOARD((B - ID), A) = 0 THEN
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NDX = NDX + 1
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XX(NDX) = A
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YY(NDX) = B - ID
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IF (ID < 0 AND B = 1) OR (ID > 0 AND B = 6) THEN
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IF BOARD((B - ID - ID), A) = 0 THEN
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NDX = NDX + 1
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XX(NDX) = A
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YY(NDX) = B - ID - ID
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END IF
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END IF
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END IF
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END IF
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END SUB
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SUB QUEEN (A, B, XX(), YY(), NDX)
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CALL BISHOP(A, B, XX(), YY(), NDX)
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CALL ROOK(A, B, XX(), YY(), NDX)
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END SUB
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SUB ROOK (A, B, XX(), YY(), NDX)
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ID = SGN(BOARD(B, A))
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FOR X = A - 1 TO 0 STEP -1
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IF ID <> SGN(BOARD(B, X)) THEN
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NDX = NDX + 1
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XX(NDX) = X
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YY(NDX) = B
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END IF
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IF (BOARD(B, X)) <> 0 THEN EXIT FOR
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NEXT
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FOR X = A + 1 TO 7 STEP 1
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IF ID <> SGN(BOARD(B, X)) THEN
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NDX = NDX + 1
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XX(NDX) = X
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YY(NDX) = B
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END IF
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IF (BOARD(B, X)) <> 0 THEN EXIT FOR
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NEXT
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FOR Y = B - 1 TO 0 STEP -1
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IF ID <> SGN(BOARD(Y, A)) THEN
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NDX = NDX + 1
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XX(NDX) = A
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YY(NDX) = Y
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END IF
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IF (BOARD(Y, A)) <> 0 THEN EXIT FOR
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NEXT
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FOR Y = B + 1 TO 7 STEP 1
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IF ID <> SGN(BOARD(Y, A)) THEN
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NDX = NDX + 1
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XX(NDX) = A
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YY(NDX) = Y
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END IF
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IF (BOARD(Y, A)) <> 0 THEN EXIT FOR
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NEXT
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END SUB
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SUB SHOWBD
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VIEW PRINT
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LOCATE 3, 30
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COLOR 7, 0
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PRINT "A B C D E F G H"
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FOR K = 0 TO 25
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LOCATE 4, 28 + K
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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) <> 0 THEN
|
|
COLOUR = 2
|
|
ELSE COLOUR = 15
|
|
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) MOD 2) <> 0 THEN BACK = 2 ELSE BACK = 15
|
|
FORE = BACK + -1 * (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 |