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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.13&nbsp; Pousse --- Tic-Tac-Toe-like Game</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9658;</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Games:<span class="mywbr"> &nbsp;</span> Fun Examples</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="bundled.html" class="tocviewselflink" data-pltdoc="x">Bundled Games</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="new-games.html" class="tocviewlink" data-pltdoc="x">Implementing New Games</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="Showing_Scribbled_Help.html" class="tocviewlink" data-pltdoc="x">Showing Scribbled Help</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="Showing_Text_Help.html" class="tocviewlink" data-pltdoc="x">Showing Text Help</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_1&quot;);">&#9660;</a></td><td>1&nbsp;</td><td><a href="bundled.html" class="tocviewlink" data-pltdoc="x">Bundled Games</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1&nbsp;</td><td><a href="aces.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="aces.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Aces</span> &#8212;<wbr></wbr> Solitaire Card Game</a></td></tr><tr><td align="right">1.2&nbsp;</td><td><a href="gofish.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gofish.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Go Fish</span> &#8212;<wbr></wbr> Kid&rsquo;s Card Game</a></td></tr><tr><td align="right">1.3&nbsp;</td><td><a href="crazy8s.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="crazy8s.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Crazy 8s</span> &#8212;<wbr></wbr> Card Game</a></td></tr><tr><td align="right">1.4&nbsp;</td><td><a href="blackjack.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="blackjack.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Blackjack</span> &#8212;<wbr></wbr> 21 Card Game</a></td></tr><tr><td align="right">1.5&nbsp;</td><td><a href="ginrummy.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="ginrummy.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Rummy</span> &#8212;<wbr></wbr> Card Game</a></td></tr><tr><td align="right">1.6&nbsp;</td><td><a href="spider.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="spider.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Spider</span> &#8212;<wbr></wbr> Solitaire Card Game</a></td></tr><tr><td align="right">1.7&nbsp;</td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="memory.png" alt="" width="26" height="32"/></span> <span class="ssansserif">Memory</span> &#8212;<wbr></wbr> Kid&rsquo;s Game</a></td></tr><tr><td align="right">1.8&nbsp;</td><td><a href="slidey.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="slidey.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Slidey</span> &#8212;<wbr></wbr> Picture Puzzle</a></td></tr><tr><td align="right">1.9&nbsp;</td><td><a href="same.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="same.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Same</span> &#8212;<wbr></wbr> Dot-<wbr></wbr>Removing Game</a></td></tr><tr><td align="right">1.10&nbsp;</td><td><a href="mines.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="mines.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Minesweeper</span> &#8212;<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.11&nbsp;</td><td><a href="paint-by-numbers.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="paint-by-numbers.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Paint By Numbers</span> &#8212;<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.12&nbsp;</td><td><a href="lights-out.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="lights-out.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Lights Out</span> &#8212;<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.13&nbsp;</td><td><a href="" class="tocviewselflink" data-pltdoc="x"><span class="noborder"><img src="pousse.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Pousse</span> &#8212;<wbr></wbr> Tic-<wbr></wbr>Tac-<wbr></wbr>Toe-<wbr></wbr>like Game</a></td></tr><tr><td align="right">1.14&nbsp;</td><td><a href="gobblet.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gobblet.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Gobblet</span> &#8212;<wbr></wbr> Strategy Game</a></td></tr><tr><td align="right">1.15&nbsp;</td><td><a href="jewel.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="jewel.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Jewel</span> &#8212;<wbr></wbr> 3-<wbr></wbr>D Skill Game</a></td></tr><tr><td align="right">1.16&nbsp;</td><td><a href="parcheesi.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="parcheesi.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Parcheesi</span> &#8212;<wbr></wbr> Board Game</a></td></tr><tr><td align="right">1.17&nbsp;</td><td><a href="checkers.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="checkers.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Checkers</span> &#8212;<wbr></wbr> Board Game</a></td></tr><tr><td align="right">1.18&nbsp;</td><td><a href="chat-noir.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="chat-noir.png" alt="" width="40" height="19"/></span> <span class="ssansserif">Chat Noir</span> &#8212;<wbr></wbr> Puzzle Game</a></td></tr><tr><td align="right">1.19&nbsp;</td><td><a href="tally-maze.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="tally-maze.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Tally Maze</span> &#8212;<wbr></wbr> Maze Enumeration Game</a></td></tr><tr><td align="right">1.20&nbsp;</td><td><a href="gcalc.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gcalc.png" alt="" width="32" height="32"/></span> <span class="ssansserif">GCalc</span> &#8212;<wbr></wbr> Visual λ-<wbr></wbr>Calculus</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<a href="lights-out.html" title="backward to &quot;1.12  Lights Out --- Logic Game&quot;" data-pltdoc="x">&larr; prev</a>&nbsp;&nbsp;<a href="bundled.html" title="up to &quot;1 Bundled Games&quot;" data-pltdoc="x">up</a>&nbsp;&nbsp;<a href="gobblet.html" title="forward to &quot;1.14  Gobblet --- Strategy Game&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h4 x-source-module="(lib &quot;games/scribblings/games.scrbl&quot;)" x-part-tag="&quot;pousse&quot;">1.13<tt>&nbsp;</tt><a name="(part._pousse)"></a><span class="noborder"><img src="pousse.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Pousse</span> &#8212;<wbr></wbr> Tic-Tac-Toe-like Game</h4><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p>To play <span class="ssansserif">Pousse</span>, run the <span class="stt">PLT Games</span> program. (Under Unix, it&rsquo;s called <span class="stt">plt-games</span>).</p></blockquote></blockquote></blockquote><p><span class="ssansserif">Pousse</span> (French for &ldquo;push,&rdquo; pronounced &ldquo;poo-ss&rdquo;) is a 2
person game, played on an <span style="font-style: italic">N</span> by <span style="font-style: italic">N</span> board (usually 4 by 4).
Initially the board is empty, and the players take turns inserting one
marker of their color (<span class="ssansserif">X</span> or <span class="ssansserif">O</span>) on the board.
The color <span class="ssansserif">X</span> always goes first.  The columns and rows are
numbered from 1 to <span style="font-style: italic">N</span>, starting from the top left, as in:</p><p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt">1 2 3 4</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;</span><span class="stt">+-+-+-+-+</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt">1 | | | | |</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;</span><span class="stt">+-+-+-+-+</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt">2 | | | | |</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;</span><span class="stt">+-+-+-+-+</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt">3 | | | | |</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;</span><span class="stt">+-+-+-+-+</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt">4 | | | | |</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;</span><span class="stt"></span><span class="hspace">&nbsp;&nbsp;</span><span class="stt">+-+-+-+-+</span></p></td></tr></table></p><p>A marker can only be inserted on the board by sliding it onto a
particular row from the left or from the right, or onto a particular
column from the top or from the bottom.  So there are <span style="font-style: italic"></span>4<span style="font-style: italic">*N</span>
possible &ldquo;moves&rdquo; (ways to insert a marker).  They are named
L<span style="font-style: italic">i</span>, R<span style="font-style: italic">i</span>, T<span style="font-style: italic">i</span>, and B<span style="font-style: italic">i</span> respectively, where
<span style="font-style: italic">i</span> is the number of the row or column where the insertion takes
place.</p><p>When a marker is inserted, there may be a marker on the square where
the insertion takes place.  In this case, all markers on the insertion
row or column from the insertion square up to the first empty square
are moved one square further to make room for the inserted marker.
Note that the last marker of the row or column will be pushed off the
board (and must be removed from play) if there are no empty squares on
the insertion row or column.</p><p>A row or a column is a <span style="font-style: italic">straight</span> of a given color if it
contains <span style="font-style: italic">N</span> markers of the given color.</p><p>The game ends either when an insertion</p><ul><li><p>repeats a previous configuration of the board; in this case the
player who inserted the marker LOSES.</p></li><li><p>creates a configuration with more straights of one color than
straights of the other color; the player whose color is dominant
(in number of straights) WINS.</p></li></ul><p>A game always leads to a win by one of the two players.  Draws are
impossible.</p><p>This game is from the 1998 ICFP programming contest.</p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<a href="lights-out.html" title="backward to &quot;1.12  Lights Out --- Logic Game&quot;" data-pltdoc="x">&larr; prev</a>&nbsp;&nbsp;<a href="bundled.html" title="up to &quot;1 Bundled Games&quot;" data-pltdoc="x">up</a>&nbsp;&nbsp;<a href="gobblet.html" title="forward to &quot;1.14  Gobblet --- Strategy Game&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div></div></div><div id="contextindicator">&nbsp;</div></body></html>