Considerations for a win-loss statistics

The following considerations are not yet completed, but they can give some hints in which direction one can dig further into the problem.

From a theoretical point of view one can partition the board into subfields of possibilities. The following main cases will be distinguished:

  1. Case 1: Beginner 'X' starts with the mmiddle cell (2,2);
  2. Case 2: The beginner 'X' starts not in the middle field but in one of the corners (1,1), (1,3), (3,1), (3,3)
  3. Case 3: The beginner 'X' starts not in the middle field but in one of the fields between the corners (1,2),(2,1),(3,2),(2,3)

 
Case (1)
 
!_  _  _  !
!         !
!_  X  _  !
!         !
!_  _  _  !

Case (2)
 
!X  _  _  !
!         !
!_  _  _  !
!         !
!_  _  _  !

Case (3)
 
!_  X  _  !
!         !
!_  _  _  !
!         !
!_  _  _  !

These main cases will be subdivided with the aid of the second turn as follows:

  1. Case 1.1: Beginner 'X' starts with the mmiddle cell (2,2); then the opponent moves into one of the corners.
  2. Case 1.2: Beginner 'X' starts with the mmiddle cell (2,2); then the opponent moves into one of the cells between the corners.
  3. Case 2.1: The beginner 'X' starts not in the middle field but in one of the corners (1,1), (1,3), (3,1), (3,3); then the opponent moves into the middle field.
  4. Case 2.2: The beginner 'X' starts not in the middle field but in one of the corners (1,1), (1,3), (3,1), (3,3); then the opponent moves into one of the corners.
  5. Case 2.3: The beginner 'X' starts not in the middle field but in one of the corners (1,1), (1,3), (3,1), (3,3); then the opponent moves into one of the cells between the corners.
  6. Case 3.1: The beginner 'X' starts not in the middle field but in one of the fields between the corners (1,2),(2,1),(3,2),(2,3) ; then the opponent moves into the middle field.
  7. Case 3.2: The beginner 'X' starts not in the middle field but in one of the fields between the corners (1,2),(2,1),(3,2),(2,3) ; then the opponent moves into one of the corners.
  8. Case 3.3: The beginner 'X' starts not in the middle field but in one of the fields between the corners (1,2),(2,1),(3,2),(2,3) ; then the opponent moves into one of the cells between the corners.

How can we compute the probability of these different cases?

Let us take as example case 1.



Subsections
Gerd Doeben-Henisch 2012-03-31