NUM1:=IF(A2 C7 AND A2 C8 AND A1 B5 AND A1 B6,0,1);
NUM2:=IF(B2 C7 AND B2 C8 AND B1 A5 AND B1 A6,0,1);
DIF1:=A1-A2;
DIF2:=B1-B2;
REII:=(DIF1+DIF2)NUM1NUM2;
REIA:=SQRT(DIF1DIF1)+SQRT(DIF2DIF2);
REI:SUM(REII,8)/SUM(REIA,8),COLORWHITE,LINETHICK2;