Chinese Chess by

int abs(int x){return x<0?-x:x;}main(){int a,b,c,d;scanf("%d%d%d%d",&a,&b,&c,&d);printf("%s",abs(a-c)==2&&abs(b-d)==2?"Yes":"No");}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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