553-marek-f.js

({argv:[,,e,c],stdout:v}=process)
p=c.split`,`.map(([x,y,s,q])=>({x:+x,y:+y,s,q,n:(x<<2)^7*(y<<3)^5,d:14}))
u=n=>n<0?7:n%8
t=(r,l)=>[u(r-1),r,u(r+1)].includes(l)
f='S'
for(j=+e;j;j--)p.map(m=>{({x,y,s,n}=m)
s==f&&m.d--
m.d||(m.s='R')
n=BigInt(n)
n^=n<<13n
n^=n>>17n
n^=n<<5n
!+m.q&&([a,b]=[[x+1,y],[x-1,y],[x,y+1],[x,y-1]][(m.n=Number(n)%(1<<30))%4].map(x=>u(x)),p.every(c=>a^c.x||b^c.y)&&(m.x=a,m.y=b))
s=='H'&&p.some(p=>p.s==f&&t(m.x,p.x)&&t(m.y,p.y))&&(m.s=f)})
for(x=0;x<64;)v.write((p.find(o=>o.x==x%8&&o.y==~~(x/8))||{s:'.'}).s+(x++%8==7?"\n":''))