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Merge pull request #6 from loopfz/troll20170708k
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Bon, l'environnement de travail reste chiant un peu...
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Gnorn authored Jul 19, 2017
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14 changes: 7 additions & 7 deletions book/RiichiBook1-ch10-grand.tex
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% Riichi Book 1, Chapter 10: Grand
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\chapter{Grand strategies} \label{ch:grand}
\chapter{Les grandes stratégies} \label{ch:grand}
\thispagestyle{empty}
The most important goal in mahjong is to win a game or generally improve the placement. I do not deny the inherent joy of winning an expensive hand with rare {\jap yaku}. However, we should always keep in mind that winning a hand is just a means to an end; sometimes dealing into an opponent's (cheap) hand can serve our purpose of winning the game.
In this chapter, I will discuss strategies to improve the placement.

\section{What do do in South-4}
\section{Que faire en Sud-4}
Most mahjong rule sets adopt some type of {\jap uma} system where players get some extra bonus / penalty points according to the placement. For example, EMA rules award $15000$ points to the first ranked player, $5000$ points to the second ranked player, $-5000$ points to the third ranked player, and $-15000$ points to the fourth ranked player. \index{european@EMA}
Such systems make it clearer that getting a better placement is generally more important than simply winning hands.

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\bigskip
That being said, assisting other players in hopes of their getting a {\jap mangan tsumo} is more like a last resort. What you should think about first and foremost is winning your own hand that is just expensive enough to improve your placement, which we will now turn to.

\subsection*{Improving the placement by {\jap ron} / {\jap tsumo}}
\subsection*{Améliorer son placement par {\jap ron} / {\jap tsumo}}
As the discussion in the previous section illustrates, you need to be extra conscious about your placement in South-4. If you are currently ahead of the game, your top priority is to maintain your placement. If you are behind, you should do your best to improve your placement as much as possible.

\bigskip
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\bigskip
You should rather keep the hand 1-away by discarding {\LARGE\wan{8}}. If you draw {\LARGE\suo{1}} or {\LARGE\suo{3}}, you can then do insta-riichi to get riichi + {\jap sanshoku} = at least 5200 (3 {\jap han}--40 minipoints). Winning it by {\jap ron} from anyone is now sufficient to improve the placement. If you draw {\LARGE\wan{5}} or {\LARGE\wan{7}}, you can also do insta-riichi to get riichi + {\jap pinfu} + {\jap dora}. Winning it either by {\jap tsumo} or {\jap ippatsu ron} is sufficient to improve the placement.\footnote{Drawing \wan{7} means you are in {\jap furiten}, but you should still do insta-riichi.}

\subsection*{Point difference induced by {\jap tsumo}}
\subsection*{L'écart de points comblé par {\jap tsumo}}
Getting the correct point differences induced by {\jap tsumo} can be a bit complicated. For example, suppose you are the North player, currently ranked second in South-4. The West player is leading the game, having 6300 more points. In this situation, would winning a 3 {\jap han}--30 minipoints hand by {\jap tsumo} be enough to improve the placement? What about winning a 3 {\jap han}--40 minipoints (= 4 {\jap han}--20 minipoints) hand by {\jap tsumo}?

\bigskip
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However, if you manage to draw {\LARGE\tong{8}} or {\LARGE\suo{7}}, you should extend the melded set to a melded quad. Doing so not only gives you a chance of {\jap rinshan tsumo} or new {\jap dora} but also enables you to improve the placement when drawing {\LARGE\suo{4}}. This is because the hand will have 50 minipoints if you {\jap tsumo}: 20 for the base minipoints + 8 for a melded Kong of {\LARGE\tong{8}} or {\LARGE\suo{7}} + 2 for a melded set of {\LARGE\suo{7}} or {\LARGE\tong{8}} + 4 for a concealed set of {\LARGE\wan{2}} + 2 for a pair of {\LARGE\fa} + 4 for a concealed set of {\LARGE\suo{4}} + 2 for {\jap tsumo} = 42, rounded up to 50 minipoints. A 2 {\jap han}--50 minipoints {\jap tsumo} induces a 4800 point difference against the dealer.

%\newpage
\subsection*{Maintaining your placement}
\subsection*{Maintenir votre placement}
If you are ahead of the game in South-4, you should do your best to maintain your current rank. Trying to win a cheap but fast hand to end the game is an option, but be extra careful not to deal into an opponent's expensive hand. For example, suppose you have 15200 more points than the second ranked player. If neither you nor the second ranked player is the dealer, he cannot defeat you even with a {\jap haneman tsumo}. Then, what you need to be wary of the most is to give him a direct hit {\jap mangan ron}. You will lose not only the 8000 points for the {\jap mangan} payment but also the 10000 bonus points for the placement, a total net loss of 18000 points.

\bigskip
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So, what should you do in such a situation?
What you should be afraid of the most is a {\jap haneman tsumo} by South or North. However, notice that South and North are in a fierce competition among themselves. Take advantage of this. If winning a fast hand yourself does not seem possible, you should try to assist the South player. Since the South player is your right player, you should discard versatile middle tiles (3--7) so that he would call {\jap chii} on them, possibly with a red five (because South needs 2 {\jap han}). Recall that even giving him a direct hit {\jap mangan ron} will secure you the first place.

\section{What to do by South-3}
\section{Que faire jusqu'en Sud-3}
It is never too early to start paying attention to your placement. If you are behind other players, the target point difference you should achieve before the beginning of South-4 is 10000 points or fewer. Overtaking with a 10000 point difference in a single hand is a tough but not unrealistic goal; you can do so either by {\jap mangan tsumo} or {\jap haneman ron}.

\bigskip
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\newpage

\section{Tables for induced point differences}
\section{Tableaux pour les écarts de points induits}

{\begin{table}[h!]
\centering\captionsetup{font=small}\small
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2 changes: 1 addition & 1 deletion book/RiichiBook1-ch11-offline.tex
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% Riichi Book 1, Chapter 11: offline
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\chapter{Manners for offline playing} \label{ch:manners}
\chapter{Les bonnes manières pour le jeu hors-ligne} \label{ch:manners}
\thispagestyle{empty}

Manners are meant to make the game of mahjong a pleasant experience.
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6 changes: 3 additions & 3 deletions book/RiichiBook1-ch12-appendix.tex
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%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
% Riichi Book 1, Appendix
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\chapter{Further readings} \label{ch:read}
\chapter{Autres suggestions de lecture} \label{ch:read}
\thispagestyle{empty}
\section{Books on riichi mahjong}
\section{Livres sur le mah-jong japonais}
\begin{wrapfigure}{r}{40mm}
\vspace{-35pt}
\begin{center}
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\newpage
\section{Online resources}
\section{Ressources en ligne}

\subsection*{Osamuko: \url{http://osamuko.com/}} \index{Osamuko}
Osamuko is one of the most extensive online mahjong blogs in English. There are quite a few blog entries there, and many of them are very good. In particular, I find the articles by a contributor named UmaiKeiki very useful.
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