int dx_TORRE[4] = { -1, 0, 1, 0 };
int dy_TORRE[4] = { 0, 1, 0, -1 };
int dx_ALFIL[4] = { -1, -1, 1, 1 };
int dy_ALFIL[4] = { 1, -1, 1, -1 };
int dx_CAVALL[8] = { -1, -1, 1, 1, -2,-2,2,2 };
int dy_CAVALL[8] = { 2, -2, 2, -2, 1, -1, 1, -1};

struct jugada {
    int x, y,xx,yy;
    bool kill;
    int val; //com valorem una jugada
};

int rival(char a, char b) {
    if (isupper(b)) swap(a,b);
    return ((a>='A' and a<='Z') and (b>='a' and b<='z'));
}