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 Reversi

Reversi (Othello) and variants.


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19. april 2003, 23:55:09
goofball38 
Ämne: re: Correct opening rules
Hi Gary, I do know what you are talking about and understand completely. I do not know the basis or where the rules came from for these versions of reversi. You may want to put this request into the feature request board to give a heads up to Fencer about this. He may have a solution that will make all dissatisfied players happy with the rules of this game.

As far as your question if it is player 1 or 2 that wins by force it totally depends on the moves of the game. I've found with reveri games that have the same rules of the othello board game that sometimes you are still forced to pass and this can sometimes allow the other person to win. The best example i have is like checkers...if say black has one or two pieces left and they are stuck then the games ends in a forefit by black. It is the same thing with the forced move in reversi. It all depends on what moves are played. But as far as changing the beginning rules, you should relay this to Fencer and see what he can do :) :)

20. april 2003, 01:28:21
Gary Barnes 
Ämne: Opening rules & explanation of 'forced win'
Goofball -

This is not quite what I was after. I did not state that I was dissatisfied with the game due to opening rules because I know too little about it to be dissatisfied or satisfied one way or another.

Let me re-explain as follows:

Request:
That top players speak up about what the CORRECT opening rules for the game are. That way beginning players are aware that they are the official rules and they will learn strategy with the correct rules. It is learning the correct rules that allows FAR more players to compete equally with one another.

I would not request this myself because I do NOT know how OFFICIAL those rules are. I just want to make sure that IF they ARE official and have been decided upon by a large governing body of the game (such as FIDE in Chess) that they are put in place so that everyone in on the same page.

It is NOT my place to request or dictate that the OFFICIAL rules be followed in a game that I don't know much about. It is up to high-level players such as Blaickner and ChessTiger.

Explanation of 'forced win':
In Chess or Pente, when someone says that he wins by force in 3 moves, it means EXACTLY that. By FORCE means that it DOES NOT MATTER how the defense moves. With BEST defense, the offense wins in 3 moves. In Chess, it would be referred to as a 'Mate in 3'.

Further specifics:
I will refer you back to ChessTiger's post from 1/15/03 that stated the following:

"Just thought (in case it is not known) that you might like to know that the 6x6 version of reversi has been solved (assuming optimal play from the opponent.
This is the work Dr Joel Feinstein from University of Nottingham, and former British champion of othello. White wins 20-16 with the diagonal setup, and 19-17 with the horizontal/vertical setup. This is of course when both play optimally!"

What he is stating is amazing but not unprecendented. GoMoku has been proven as a forced win in 24 moves for player 1! THAT is JUST as amazing if not more so.

I will explain what this means in more detail. What Dr. Feinstein has proven is that it doesn't matter HOW black moves, if he plays the VERY BEST defense possible, the best he can do is LOSE 20-16 or 19-17 to white if white plays PERFECT lines. It may sound strange that ANYONE could play PERFECT lines, but as you advance up the ranks and study ANY game, you will quickly be able to see a LARGE portion of the BEST lines as you play games with your opponents, especially in simpler version of the game like the 6x6 version of Reversi.

So to quote your statement, it does NOT depend on how Black moves, white will ALWAYS win AT LEAST 19-17 or 20-16 (depending on the opening setup) on the 6x6 board, IF he plays PERFECTLY.

If this is not clear, try the following:
Play tic-tac-toe on a 9x9 board, but do not change the rules. Both sides must STILL get 3 in a row to win. Now have player 1 play his first move in the center. You will quickly see that he wins in 3 moves, no matter how player 2 moves and it is easy to see PERFECT moves for him. So that is referred to as a forced win in 3 moves by player 1.

Now try the slightly more diffult same thing but make the winner the first to get FOUR in a row. The first player wins by force in 7 moves. Although it's not easy to see PERFECT moves for player 1 at first glance, VERY simple patterns can be demonstrated and shown VERY easily to players of all skill levels.

The same applies to MANY games of skill, albeit on a MUCH more complex level. It's just FAR more difficult to see. But high-level players and mathematicians will sometimes come up with a proof for a game sooner or later like they have done in 6x6 Reversi. What this means is that if you played a 6x6 Reversi playing computer that made PERFECT moves as white and you played black, you would lose 100% of the time, even if you were the BEST Reversi player in the world!

So I hope that clears that up. So what I am asking players such as Blaickner and ChessTiger, is the following:
Is it player 1 or player 2 that wins by force 19-17 or 20-16 in 6x6 Reversi?

I am asking this because I am a 'student' of other games of skill, especially Pente, and am ALWAYS interested in the PROOF of any game.


Thank you,
Gary Barnes

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