1 #include <stdlib.h> /* malloc, free, rand */ 2 3 extern int rows, columns, vnum; 4 extern int row_col, row_1_col, row_2_col; 5 extern int *brett, *weiss, *schwarz, **freip, **doublesp; 6 extern int frei[], reihenfolge[], doubles[]; 7 extern int (*pu)[4]; 8 extern int *_p_h_, **pp; 9 extern struct oldv { 10 int *pos, value; 11 } *stack, *sp, **zugstack; 12