added play_chess.c

play_chess.c

+
+void play_chess(){
+
+	    // storing user input (format: e2e4, queening is automatical)
+	
+	int side = WHITE;    // user starts first with the color white
+	
+	char move[5];
+	show_board();
+	while(1)  
+	{
+	memset(&move[0], 0, sizeof(move));   
+	if(!fgets(move, 5, stdin)) continue;   
+	if(move[0] == '\n') continue;    
+	
+	for(int square = 0; square < 128; square++)    // loop over board squares
+	{
+	    if(!(square & 0x88))    // if square is onboard
+	    {
+		if(!strncmp(move, algebraic_board[square], 2))    
+		    source = square;                         
+
+		if(!strncmp(move + 2, algebraic_board[square], 2))    
+		    destination = square;                            
+	    }
+	}
+
+	 
+        // make user move
+        board[destination] = board[source];
+        board[source] = 0;
+
+        // if pawn promotion
+        if(((board[destination] == 9) && (destination >= 0 && destination <= 7)) ||
+           ((board[destination] == 18) && (destination >= 112 && destination <= 119)))
+            board[destination] |= 7;
+
+        show_board();
+
+        side = 24 - side;   // change side
+              
+        int score = alpha_beta_search(side, depth, -10000, 10000);
+
+        // make AI move
+        board[best_dst] = board[best_src];
+        board[best_src] = 0;
+
+        // if pawn promotion
+        if(((board[best_dst] == 9) && (best_dst >= 0 && best_dst <= 7)) ||
+           ((board[best_dst] == 18) && (best_dst >= 112 && best_dst <= 119)))
+            board[best_dst] |= 7;
+
+        side = 24 - side;   
+
+        show_board();
+        if(score == 10000 || score == -10000) {printf("Checkmate!\n"); break;}
+        
+
+    }
+
+}