You just run multi-PV analysis and play moves to keep the intrinsic performance rating[1][2] at the desired level.<p>[1] <a href="http:&#x2F;&#x2F;www.cse.buffalo.edu&#x2F;~regan&#x2F;papers&#x2F;pdf&#x2F;ReHa11c.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cse.buffalo.edu&#x2F;~regan&#x2F;papers&#x2F;pdf&#x2F;ReHa11c.pdf</a><p>[2] <a href="http:&#x2F;&#x2F;www.cse.buffalo.edu&#x2F;~regan&#x2F;papers&#x2F;pdf&#x2F;Reg12IPRs.pdf" rel="nofollow">http:&#x2F;&#x2F;www.cse.buffalo.edu&#x2F;~regan&#x2F;papers&#x2F;pdf&#x2F;Reg12IPRs.pdf</a>