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Tic Tac Toe -Noughts and cross

價格:免費

更新日期:2020-01-07

檔案大小:24.9 MB

目前版本:1.1

版本需求:系統需求:iOS 9.0 或以後版本。相容裝置:iPhone、iPad、iPod touch。

支援語言:英語

Tic Tac Toe -Noughts and cross(圖1)-速報App

Synonyms of this game name:

- Tick-tack-toe, tic-tac-toe, tick-tat-toe, or tit-tat-toe (United States, Canada)

- Noughts and crosses or naughts and crosses (United Kingdom, Republic of Ireland, Australia, New Zealand, South Africa, Zimbabwe)

- Exy-ozys, xsie-osies (verbal name only) (Northern Ireland)

Tic Tac Toe -Noughts and cross(圖2)-速報App

- Xs and Os (Egypt, Republic of Ireland, Canada, Zimbabwe)

More detailedly, to guarantee a draw, O should adopt the following strategies:

If X plays corner opening move (best move for them), O should take center, and then an edge, forcing X to block in the next move. This will stop any forks from happening. When both X and O are perfect players and X chooses to start by marking a corner, O takes the center, and X takes the corner opposite the original. In that case, O is free to choose any edge as its second move. However, if X is not a perfect player and has played a corner and then an edge, O should not play the opposite edge as its second move, because then X is not forced to block in the next move and can fork.

If X plays edge opening move, O should take center, and then follow the above list of priorities, mainly paying attention to block forks.

Tic Tac Toe -Noughts and cross(圖3)-速報App

If X plays a center opening move, O should take the corner, and then follow the above list of priorities, mainly paying attention to block forks.

When X plays corner first (best move for them), and O is not a perfect player, the following may happen:

If O responds with a center mark (best move for them), a perfect X player will take the corner opposite the original. Then O should play an edge. However, if O plays a corner as its second move, a perfect X player will mark the remaining corner, blocking O's 3-in-a-row and making their own fork.

If O responds with a corner mark, X is guaranteed to win, by simply taking any of the other two corners and then the last, a fork. (since when X takes the third corner, O can only take the position between the two X's. Then X can take the only remaining corner to win)

Tic Tac Toe -Noughts and cross(圖4)-速報App

If O responds with an edge mark, X is guaranteed to win, by taking center, then O can only take the corner opposite the corner which X plays first. Then X can take a corner to win.

Tic Tac Toe -Noughts and cross(圖5)-速報App

支援平台:iPhone, iPad