var chess_board_with_letters = [
['R','N','B','Q','K','B','N','R'],
['P','P','P','P','P','P','P','P'],
[' ',' ',' ',' ',' ',' ',' ',' '],
[' ',' ',' ',' ',' ',' ',' ',' '],
[' ',' ',' ',' ',' ',' ',' ',' '],
[' ',' ',' ',' ',' ',' ',' ',' '],
['p','p','p','p','p','p','p','p'],
['r','n','b','q','k','b','n','r'] ];
console.log(chess_board_with_letters.join('\n'));
/*
run:
R,N,B,Q,K,B,N,R
P,P,P,P,P,P,P,P
, , , , , , ,
, , , , , , ,
, , , , , , ,
, , , , , , ,
p,p,p,p,p,p,p,p
r,n,b,q,k,b,n,r
*/