newest pente variant: s-pente

[Mark and Sharon Mammel <msmammel@starpower.net>]

Here is the newest variant of pente opening rules: s-pente
challenge me to s-pente or any other variant:
d-pente, g-pente, pente+-

-Mark

S-Pente is the same as 2- player Pente except for the following
opening rules suggested by Oleg Stepanov:

  Players are initially referred to as "tentative Ohs" and "tentative
Eks".

   Move#1
          Ohs first move of the game is automatically made to the center
K10.
   Move#2.
          tentative Eks has to make the second move into the central
zone 3x3
            (J-L, 9-11)
   Move#3.
          tentative Ohs has to make the third move into the central zone
5x5
            (H-M, 8-12)
   Move#4a. Tentative Eks may swap sides after the 3rd move.

If no swap was made after the 3rd move, no further opening rules are
applied.

If the swap was made:
   Move#4b. Tentative Ohs (now Eks) makes an unrestricted move.
   Move#5a. Now, Tentative Eks (now Ohs) may swap sides.
   Move#5b. Ohs makes an unrestricted move and no more opening rules are

   applied.