The Rule of 2, 3 and 4

<BODY> <H1>The rule of two, rule of three and rule of four</H1> <P>Here is the <A href="Rule234_main.htm"> non-frame based version of the Rules of two, three and four</A>. The rules of two, three and four are used to determine if you should open with a pre-emptive depending upon the prevailing vulnerability. </P> </BODY>