This is a fully working chess program with graphics. In 1024 bytes of JS. o_0(js1k.com)

   for (B = i = y = u = b = i = 5 - 5, x = 10, I = [], l = []; l[B] = "ECDFBDCEAAAAAAAAIIIIIIIIMKLNJLKM@G@TSb~?A6J57IKJT576,+-48HLSUmgukgg OJNMLK IDHGFE".charCodeAt(B) - 64, B++ < 120; I[B - 1] = B % x ? B / x % x < 2 | B % x < 2 ? 7 : B / x & 4 ? 0 : l[i++] : 7);
   
   function X(c, h, e, s) {
       e ^= 8;
       for (var o, S, C, A, R, T, G, n, N = -1e8, O = 20; ++O < 99;) if ((o = I[T = O]) && (G = o ^ e) < 7) {
           A = G-- & 2 ? 8 : 4;
           C = o - 9 ? l[61 + G] : 49;
           do
           if (!(R = I[T += l[C]]) && !! G | A < 3 || (R + 1 ^ e) > 9 && G | A > 2) {
               if (!(R - 2 & 7)) return 78 - h << x;
               n = G | (e ? T > 29 : T < 91) ? o : 6 ^ e;
               S = (R && l[R & 7 | 32] - h - G) + (G ? 0 : n - o ? 55 : (A < 2) + 1);
               if (c > h || 1 < c & c == h && S > 2) {
                   I[T] = n;
                   I[O] = 0;
                   S -= X(c, h + 1, e, S - N);
                   if (!(h || c - 1 | B - O | T - b | S < -1e4)) return W(B = 0), e && setTimeout("X(2,0,8),X(1,0,8)", 50);
                   I[O] = o;
                   I[T] = R
               }
               if (S > N || !h & S == N && Math.random() < .5) if (N = S, c > 1) if (h ? s - S < 0 : (B = O, b = T, 0)) return S
           }
           while (!R & G > 2 || (T = O, (G || A > 2 | (e ? O > 78 : O < 41) & !R) && ++C--A))
       }
       return N
   }
   function W() {
       i = "<table>";
       for (u = 18; u < 98; i += ++u % x - 9 ? "<th width=60 height=60style='font-size:50px'bgcolor=#" + (u - B ? u.9 & 1 || 9 : "d") + "0f0e0>&#" + (I[u] ? 9808 + l[67 + I[u]] : 160) + ";" : u++ && "<tr>");
       document.body.innerHTML = i + "</table>"
   }
   W();