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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Tic-Tac-Toe</span></h1>
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<p><b>Tic-Tac-Toe</b> oder <b>Drei gewinnt</b> (auch <a href="Kreis_(Geometrie)" class="mw-redirect" title="Kreis (Geometrie)">Kreis</a> und <a href="Kreuz_(Symbol)" title="Kreuz (Symbol)">Kreuz</a>, Dodelschach) ist ein klassisches, einfaches Zweipersonen-<a href="Strategiespiel" title="Strategiespiel">Strategiespiel</a>, dessen Geschichte sich bis ins 12. Jahrhundert v. Chr. zurückverfolgen lässt.
</p>
<div class="mw-heading mw-heading2"><h2 id="Spielverlauf">Spielverlauf</h2></div>
<p>Auf einem quadratischen, 3×3 Felder großen Spielfeld setzen die beiden Spieler abwechselnd ihr Zeichen (ein Spieler Kreuze, der andere Kreise) in ein freies Feld. Der Spieler, der als Erster drei Zeichen in eine Zeile, Spalte oder Diagonale setzen kann, gewinnt. Wenn allerdings beide Spieler optimal spielen, kann keiner gewinnen, und es kommt zu einem Unentschieden. Das heißt, alle neun Felder sind gefüllt, ohne dass ein Spieler die erforderlichen Zeichen in einer Reihe, Spalte oder Diagonalen setzen konnte.
</p>
<div class="mw-heading mw-heading2"><h2 id="Beispielpartien">Beispielpartien</h2></div>
<p>Erster Spieler (X) gewinnt, weil Spieler zwei (O) beim ersten Zug einen Fehler macht:
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<annotation encoding="application/x-tex">{\displaystyle {\begin{array}{c|c|c}\,\,&\,\,&\,\,\\\hline \,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\times \!&\!\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\color {green}\times \!&\!\times \!&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\times \!&\!\times \!&\,\,\\\hline \!\color {green}\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\times \!&\!\times \!&\!\color {green}\times \!\\\hline \!\circ \!&\,\,&\!\circ \!\\\end{array}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/13c5d57ee3b41eccb447ce62fb781e9f80818574.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.505ex; width:84.353ex; height:10.176ex;" alt="{\displaystyle {\begin{array}{c|c|c}\,\,&\,\,&\,\,\\\hline \,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\times \!&\!\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\color {green}\times \!&\!\times \!&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\times \!&\!\times \!&\,\,\\\hline \!\color {green}\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\circ \!&\,\,\\\hline \!\times \!&\!\times \!&\!\color {green}\times \!\\\hline \!\circ \!&\,\,&\!\circ \!\\\end{array}}}" loading="lazy"></span>
<br><br>
</p><p>Erster Spieler (X) verliert, weil er beim zweiten Zug einen Fehler macht:
</p><p><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\color {green}\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\!\color {green}\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\color {green}\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\color {green}\circ \!&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\times \!\\\end{array}}}">
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<mo>×<!-- × --></mo>
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<annotation encoding="application/x-tex">{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\color {green}\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\!\color {green}\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\color {green}\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\color {green}\circ \!&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\times \!\\\end{array}}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f92324098cc3db600b659ae0718964ead84c8318.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.505ex; width:95.608ex; height:10.176ex;" alt="{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\color {green}\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\!\color {green}\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\color {green}\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\color {green}\circ \!&\!\circ \!&\,\,\\\hline \!\circ \!&\!\times \!&\!\times \!\\\end{array}}}" loading="lazy"></span>
<br><br>
</p><p>Erster Spieler (X) verliert, weil er beim zweiten Zug einen Fehler macht:
</p><p><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\times \!&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\color {green}\circ \!\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\color {green}\times \!\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\times \!\\\hline \!\color {green}\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\color {green}\times \!&\!\times \!\\\hline \!\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\times \!&\!\times \!\\\hline \!\circ \!&\!\color {green}\circ \!&\!\circ \!\\\end{array}}}">
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<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
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<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
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<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
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</mtd>
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<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
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</mrow>
<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
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<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
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</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
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<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
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<mtd>
<mspace width="thinmathspace"></mspace>
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<mo>∘<!-- ∘ --></mo>
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<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
<mtr>
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<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mstyle>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="thinmathspace"></mspace>
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</mtd>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
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</mrow>
<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
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<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mstyle>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
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<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
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</mtable>
</mrow>
<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mstyle>
</mtd>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
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<mo>∘<!-- ∘ --></mo>
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</mtd>
</mtr>
</mtable>
</mrow>
<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="thinmathspace"></mspace>
<mspace width="thinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mstyle>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
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</mtd>
<mtd>
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</mtd>
<mtd>
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<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
</mtable>
</mrow>
<mspace width="1em"></mspace>
<mrow class="MJX-TeXAtom-ORD">
<mtable columnalign="center center center" rowspacing="4pt" columnspacing="1em" rowlines="solid solid" columnlines="solid solid">
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="thinmathspace"></mspace>
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</mtd>
<mtd>
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<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>×<!-- × --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
</mtr>
<mtr>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mstyle mathcolor="green">
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
</mstyle>
</mtd>
<mtd>
<mspace width="negativethinmathspace"></mspace>
<mo>∘<!-- ∘ --></mo>
<mspace width="negativethinmathspace"></mspace>
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</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\times \!&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\color {green}\circ \!\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\color {green}\times \!\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\times \!\\\hline \!\color {green}\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\color {green}\times \!&\!\times \!\\\hline \!\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\times \!&\!\times \!\\\hline \!\circ \!&\!\color {green}\circ \!&\!\circ \!\\\end{array}}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/071c825c46995c4a851da186d00f2f8229351612.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.505ex; width:97.552ex; height:10.176ex;" alt="{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\times \!&\!\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\color {green}\circ \!\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\color {green}\times \!\\\hline \,\,&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\,\,&\!\times \!\\\hline \!\color {green}\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\color {green}\times \!&\!\times \!\\\hline \!\circ \!&\,\,&\!\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\times \!&\!\circ \!\\\hline \,\,&\!\times \!&\!\times \!\\\hline \!\circ \!&\!\color {green}\circ \!&\!\circ \!\\\end{array}}}" loading="lazy"></span>
<br><br>
Kein Spieler gewinnt, da beide fehlerfrei spielen:
</p><p><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{array}{c|c|c}\!\color {green}\times \!&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\circ \!&\!\color {green}\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\color {green}\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \!\color {green}\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\color {green}\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\color {green}\times \!&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\circ \!\\\end{array}}}">
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<mo>×<!-- × --></mo>
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<annotation encoding="application/x-tex">{\displaystyle {\begin{array}{c|c|c}\!\color {green}\times \!&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\circ \!&\!\color {green}\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\color {green}\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \!\color {green}\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\color {green}\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\color {green}\times \!&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\circ \!\\\end{array}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/bc41d280aea7502c6645c3f5f57fc636c8c88fce.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.505ex; width:109.712ex; height:10.176ex;" alt="{\displaystyle {\begin{array}{c|c|c}\!\color {green}\times \!&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\,\,\\\hline \,\,&\!\circ \!&\!\color {green}\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\color {green}\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \,\,&\!\circ \!&\!\times \!\\\hline \!\color {green}\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\color {green}\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\color {green}\times \!&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\,\,&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\color {green}\circ \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\times \!&\!\color {green}\times \!&\!\circ \!\\\hline \!\circ \!&\!\circ \!&\!\times \!\\\hline \!\times \!&\!\times \!&\!\circ \!\\\end{array}}}" loading="lazy"></span>
<br><br>
Kein Spieler gewinnt, da beide fehlerfrei spielen:
</p><p><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{array}{c|c|c}\,\,&\!\color {green}\times \!&\,\,\\\hline \,\,&\,\,&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\,\,\\\hline \,\,&\!\color {green}\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\,\,&\!\times \!&\!\color {green}\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\color {green}\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\,\,&\,\,\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\,\,\\\hline \,\,&\,\,&\!\color {green}\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \,\,&\!\circ \!&\!\color {green}\circ \!\\\hline \,\,&\,\,&\!\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\color {green}\times \!&\!\circ \!&\!\circ \!\\\hline \,\,&\,\,&\!\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\times \!&\!\circ \!&\!\circ \!\\\hline \,\,&\!\color {green}\circ \!&\!\times \!\\\end{array}}\quad {\begin{array}{c|c|c}\!\circ \!&\!\times \!&\!\times \!\\\hline \!\times \!&\!\circ \!&\!\circ \!\\\hline \!\color {green}\times \!&\!\circ \!&\!\times \!\\\end{array}}}">
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</p>
<div class="mw-heading mw-heading2"><h2 id="Strategie_und_Taktik">Strategie und Taktik</h2></div>
<p>Für Tic-Tac-Toe gibt es 255.168 verschiedene Spielverläufe, von denen 131.184 mit einem Sieg des ersten Spielers enden, 77.904 mit einem Sieg des zweiten Spielers und 46.080 mit einem Unentschieden. (Bei diesen Zahlenangaben wird die erste Konfiguration mit drei X oder drei O in einer Reihe, Spalte oder Diagonale oder ein vollständig ausgefülltes Spielfeld, aber nicht bereits die Situation, ab der der Ausgang feststeht, als Ende des Spiels betrachtet.)
</p><p>Viele Spielverläufe sind gleich in dem Sinne, dass sie sich durch Drehungen oder Spiegelungen des Spielfelds ineinander überführen lassen. Gleiche Verläufe zusammengefasst, vermindert sich die Zahl der verschiedenen Spielverläufe auf ein Achtel: insgesamt 31.896, wobei 16.398 vom ersten und 9.738 vom zweiten Spieler gewonnen werden und 5.760 unentschieden ausgehen. (Aus jedem Spielverlauf erhält man durch Rotationen und Spiegelungen sieben weitere Spielverläufe, denn da am Ende immer mindestens fünf Felder belegt sind, ist kein Spielverlauf symmetrisch bezüglich einer Rotation oder Spiegelung.)
</p><p>Es gibt 5.478 verschiedene Spielsituationen, ohne Rotation oder Spiegelung 765. Im Vergleich zu Spielen wie <a href="Go_(Spiel)" title="Go (Spiel)">Go</a>, <a href="Damespiel" class="mw-redirect" title="Damespiel">Dame</a> oder <a href="Schach" title="Schach">Schach</a> ist die Anzahl der Spielverläufe und Spielsituationen verschwindend gering. Wegen dieser geringen Komplexität lässt sich leicht zeigen, dass beide Spieler ein Unentschieden erzwingen können.
</p><p>Der erste Spieler kann nicht bereits im ersten Zug verlieren. Der zweite Spieler hält nur in 24 von den 72 Möglichkeiten für die beiden ersten Züge ein Unentschieden.
</p><p>Erster Spieler (X) beginnt, zweiter Spieler (O) hält ein Unentschieden (gespiegelte und rotierte Möglichkeiten sind nicht dargestellt):
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<br><br>
Es gibt 16 Unentschieden-Positionen, die aus folgenden drei durch Spiegelung oder Rotation erhalten werden können:
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<br><br>
Meist setzt der erste Spieler (X) in die Mitte. Der zweite Spieler muss, um ein Unentschieden zu erzwingen, in die Ecke setzen, sonst kann Spieler 1 mühelos einen Sieg erringen:
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</p>
<div class="mw-heading mw-heading2"><h2 id="Weitere_Informationen">Weitere Informationen</h2></div>
<p>Der britische Informatiker und <a href="K%C3%BCnstliche_Intelligenz" title="Künstliche Intelligenz">KI</a>-Forscher <a href="Donald_Michie" title="Donald Michie">Donald Michie</a> entwickelte 1960 mit MENACE („Machine Educable Noughts And Crosses Engine“) einen „Computer“ auf Basis hunderter <a href="Streichholzschachtel" title="Streichholzschachtel">Streichholzschachteln</a>, der Tic-Tac-Toe lernen konnte. In den Schächtelchen, die jeweils einen möglichen Spielstand repräsentierten, waren durch verschiedenfarbige Perlen die möglichen Züge gespeichert. Je nachdem, ob ein Spiel verloren ging oder gewonnen wurde, wurden die entsprechenden Perlen entfernt oder gleichfarbige dazugelegt. Dadurch lernte das System erfolgreiche Züge und war nach einigen hundert Partien unbesiegbar.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>Tic-Tac-Toe war auch eines der ersten Spiele, die auf Computern (bereits vor <a href="Tennis_for_Two" title="Tennis for Two">Tennis for Two</a>, 1958) erschienen (Spiel <a href="OXO_(Computerspiel)" title="OXO (Computerspiel)">OXO</a> auf einem <a href="EDSAC" class="mw-redirect" title="EDSAC">EDSAC</a>-Computer, 1952).
</p><p>Eine entscheidende Rolle spielt Tic-Tac-Toe auch im Film <i><a href="WarGames_%E2%80%93_Kriegsspiele" title="WarGames – Kriegsspiele">WarGames – Kriegsspiele</a></i>.
</p><p>Der Toilettenreiniger Hirayama im Film <i><a href="Perfect_Days" title="Perfect Days">Perfect Days</a></i> beginnt ein Tic-Tac-Toe Spiel mit einem Fremden, nachdem er ein in einem Schlitz verstecktes Papierstück in einer Kabine findet. Das Spiel wird im Laufe des Films fortgesetzt.
</p><p><span id="TicTacToe"></span> Tic-Tac-Toe lief 1992 als tägliche Gameshow <i>TicTacToe</i> (wie die ältere <a href="ARD" title="ARD">ARD</a>-Show <i><a href="Tick-Tack-Quiz" title="Tick-Tack-Quiz">Tick-Tack-Quiz</a></i> nach dem US-Vorbild <i>Tic-Tac-Dough</i>) auf <a href="RTL_Television" title="RTL Television">RTL</a>. Moderator war <a href="Michael_F%C3%B6rster_(Moderator)" title="Michael Förster (Moderator)">Michael Förster</a>. Dort verbarg sich hinter jedem der Felder eine in vier Sekunden zu beantwortende Frage; es gewann, wer als Erster eine Dreierreihe von Feldern erobert hatte. In den Folgen 31 bis 33 hatte der Quizspieler <a href="Thomas_Kinne" title="Thomas Kinne">Thomas Kinne</a> einen seiner ersten Fernsehauftritte.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p><p>Das Spiel war auch die Basis für die US-Gameshow <i>Hollywood Squares</i>, die in Deutschland in den 1990er Jahren als <i>XXO – Fritz und Co</i> auf Sat.1 lief.
</p><p>Man kann es im Browser auf mehreren verschiedenen Schwierigkeitsgraden oder gegen einen Freund spielen.
</p>
<div class="mw-heading mw-heading2"><h2 id="Ähnliche_Spiele"><span id=".C3.84hnliche_Spiele"></span>Ähnliche Spiele</h2></div>
<ul><li><a href="Teeko" title="Teeko">Teeko</a>, <a href="Vier_gewinnt" title="Vier gewinnt">Vier gewinnt</a>, <a href="F%C3%BCnf_in_eine_Reihe" title="Fünf in eine Reihe">Fünf in eine Reihe</a></li>
<li><a href="Meta-Tic-Tac-Toe" title="Meta-Tic-Tac-Toe">Meta-Tic-Tac-Toe</a>, ein Tic-Tac-Toe aus neun Tic-Tac-Toe-Feldern</li>
<li>Erweiterungen auf drei Dimensionen: <a href="Qubic" title="Qubic">Qubic</a>, <a href="Sogo" title="Sogo">Sogo</a></li>
<li><a href="Tick-Tack-Quiz" title="Tick-Tack-Quiz">Tick-Tack-Quiz</a>, ein Tic-Tac-Toe das per Quiz gefüllt wird</li>
<li>Tick oaT Two: Die Spieler setzen abwechselnd waagerechte und senkrechte Striche in ein 3x3-Feld, wodurch auf manchen Feldern Kreuze entstehen. Der Spieler, der zuerst drei Kreuze in einer Reihe bildet, gewinnt.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Literatur">Literatur</h2></div>
<ul><li>Norman Do: <i><a rel="nofollow" class="external text" href="https://austms.org.au/wp-content/uploads/Gazette/2005/Jul05/Jul05.pdf">How to Win at TicTacToe</a></i> (PDF; 2,5 MB), The Australian Mathematical Society, Gazette, Volume 32 Number 3, July 2005, S. 151–161</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<div class="sisterproject" style="margin:0.1em 0 0 0;"><div class="noresize noviewer" style="display:inline-block; line-height:10px; min-width:1.6em; text-align:center;" aria-hidden="true" role="presentation"><span class="mw-default-size" typeof="mw:File"><span title="Commons"></span></span></div><b><span class=""><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Tic_Tac_Toe?uselang=de"><span lang="en">Commons</span>: Tic Tac Toe</a></span></b> – Sammlung von Bildern, Videos und Audiodateien</div>
<ul><li>Folge <a href="https://oeis.org/A008907" class="extiw external" title="oeis:A008907">A008907</a> in <a href="On-Line_Encyclopedia_of_Integer_Sequences" title="On-Line Encyclopedia of Integer Sequences">OEIS</a> (englisch; Anzahl der möglichen Stellungen im Spielverlauf bis auf Rotation oder Spiegelung)</li>
<li><a rel="nofollow" class="external text" href="https://xkcd.com/832/">(englisch) Anleitung zum Spiel ohne Niederlage</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="cite">Oliver Child: <a rel="nofollow" class="external text" href="https://chalkdustmagazine.com/features/menace-machine-educable-noughts-crosses-engine/"><i>Menace: the Machine Educable Noughts And Crosses Engine.</i></a> 13. März 2016,<span class="Abrufdatum"> abgerufen am 19. Dezember 2017</span> (englisch).</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3ATic-Tac-Toe&rft.title=Menace%3A+the+Machine+Educable+Noughts+And+Crosses+Engine&rft.description=Menace%3A+the+Machine+Educable+Noughts+And+Crosses+Engine&rft.identifier=https%3A%2F%2Fchalkdustmagazine.com%2Ffeatures%2Fmenace-machine-educable-noughts-crosses-engine%2F&rft.creator=Oliver+Child&rft.date=2016-03-13&rft.language=en"> </span></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><span class="cite"><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=CT0yRnCQvKc&feature=youtu.be"><i><i>TicTacToe</i> 33 1992-03-30.</i></a> In: <i>YouTube.</i> 24. Juli 2018,<span class="Abrufdatum"> abgerufen am 3. August 2018</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3ATic-Tac-Toe&rft.title=%27%27TicTacToe%27%27+33+1992-03-30&rft.description=%27%27TicTacToe%27%27+33+1992-03-30&rft.identifier=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DCT0yRnCQvKc%26feature%3Dyoutu.be&rft.date=2018-07-24"> </span></span>
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