My prog passes all 307 tests from the forum and gets WA6, help me please... )

I had the same problem.
I was inputting data as follows.
char x, y;
cin>>x>>y;
WhitePawn.x = x-'a'+1;
WhitePawn.y = y-'0';

What I should have done was
char x;
int y;
cin>>x>>y;
WhitePawn.x = x-'a'+1;
WhitePawn.y = y;

Got the point? That's why your prog passes all f*illion tests on this forum- they all have n=8.

GoodLuck!