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Created page with "'''Home * Engines * Horizon''' FILE:SkyView2.PNG|border|right|thumb| Horizon - Sky View <ref>[http://commons.wikimedia.org/wiki/File:SkyView2.PNG Sky View..."
'''[[Main Page|Home]] * [[Engines]] * Horizon'''
[[FILE:SkyView2.PNG|border|right|thumb| Horizon - Sky View <ref>[http://commons.wikimedia.org/wiki/File:SkyView2.PNG Sky View 2] by gierszewski, 2005, Sunrise at [https://en.wikipedia.org/wiki/Calgary Calgary], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Horizon''', (Horizon Chess)<br/>
a [[WinBoard]] compatible chess engine by primary author [[Ron Murawski]] and chess advisor and book author [[Jim Monaghan]].
Written in [[C]], the programming started in July 2001, first release was already in October 2001.
Initially running atop a much-modified version of [[Colin Frayn|Colin Frayn's]] open-source [[Beowulf]] infrastructure, there's very little of Beowulf that remains within Horizon and less with each release <ref>[http://www.horizonchess.com/pmwiki.php?n=Main.HomePage Horizon Chess - Main - Acknowledgements]</ref>.
=Search=
<ref>Features from [http://www.horizonchess.com/pmwiki.php?n=Main.EngineTechnicalDescription Horizon Chess - Main - EngineTechnicalDescription]</ref>
==Features==
* [[Iterative Deepening]]
* [[Aspiration Windows]] (Asymmetric on [[Side to move]])
* [[Principal Variation Search]]
* [[Move Ordering]]
** [[Internal Iterative Deepening]]
** [[Killer Heuristic]] with two [[Killer Move|Killers]] and one [[Mate Killers|Mate Killer]] per [[Ply]]
* [[Selectivity]]
** [[Extensions#FractionalExtensions|Fractional Extensions / Reductions]]
** [[Mate Threat Extensions]]
** [[One Reply Extensions]]
** [[Check Extensions]] ([[Discovered Check]])
** [[Recapture Extensions]]
** [[Passed Pawn Extensions|Passed Pawn Extensions (7th Rank)]]
** [[Quiescence Search]] with [[Check Extensions]]
** [[Null Move Pruning#AdaptiveNullMovePruning|Adaptive Null Move Pruning]] ([[Depth Reduction R|R]] 2-4.5, Up to 3 [[Null Move|Null Noves]] per Line)
** [[Null Move Pruning#ZugzwangVerification|Null Move Verification]]
** [[Futility Pruning]]
** [[Razoring|Adaptive Razoring]]
** [[Reductions]] (for non-dangerous moves)
=Tournament Play=
Horizon played the [[WCRCC 2007]] and [[WCRCC 2008]] Annual ACCA World Computer Rapid Chess Championship.
=Selected Games=
[[WCRCC 2008]], round 14, [[Horizon]] - [[Tornado]] <ref>[http://compchess.org/ACCAWCRCC/2008ACCAWCRCC/2008WCRCCResults.html 2008 Second Annual ACCA World Computer Chess Championships - Results - PGN-Download]</ref>
<pre>
[Event "WCRCC 2008"]
[Site "Internet Chess Club"]
[Date "2008.06.22"]
[Round "14"]
[White "Horizon"]
[Black "Tornado"]
[Result "1-0"]
1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7
9.O-O a6 10.a4 b4 11.Nb1 c5 12.Nbd2 cxd4 13.exd4 Be7 14.Nc4 O-O 15.Be3 Ng4
16.h3 Nxe3 17.fxe3 Rc8 18.Qe2 Qc7 19.e4 Kh8 20.Rac1 f6 21.Nfd2 e5 22.Nb3 exd4
23.Nca5 Qb8 24.Nxb7 Rxc1 25.Rxc1 Qxb7 26.Bxa6 Qa7 27.Bb5 d3+ 28.Qf2 Qxf2+
29.Kxf2 f5 30.Bxd7 fxe4+ 31.Kg1 e3 32.Bb5 d2 33.Rb1 Bf6 34.Be2 g6 35.a5 Be5
36.Bf3 Bxb2 37.a6 Rf7 38.a7 Rxa7 39.Rxb2 Rd7 40.Rb1 Rd3 41.Kf1 h5 42.Bd1 Rc3
43.Ke2 h4 44.Nd4 Rc5 45.Nc2 Rg5 46.Nxe3 Rb5 47.Rb3 Rb8 48.Bc2 Kg7 49.Kxd2 Rb5
1-0
</pre>
=See also=
* [[Horizon Effect]]
* [[Horizon Node]]
=External Links=
==Chess Engine==
* [http://www.horizonchess.com/pmwiki.php?n=Main.HomePage Horizon Chess - Main - Horizon Chess]
: [http://www.horizonchess.com/pmwiki.php?n=Main.EngineTechnicalDescription Horizon Chess - Main - EngineTechnicalDescription]
==Misc==
* [https://en.wikipedia.org/wiki/Horizon Horizon from Wikipedia]
* [https://en.wikipedia.org/wiki/Horizon_%28disambiguation%29 Horizon (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Horizon_effect Horizon effect from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:WinBoard]]
[[FILE:SkyView2.PNG|border|right|thumb| Horizon - Sky View <ref>[http://commons.wikimedia.org/wiki/File:SkyView2.PNG Sky View 2] by gierszewski, 2005, Sunrise at [https://en.wikipedia.org/wiki/Calgary Calgary], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Horizon''', (Horizon Chess)<br/>
a [[WinBoard]] compatible chess engine by primary author [[Ron Murawski]] and chess advisor and book author [[Jim Monaghan]].
Written in [[C]], the programming started in July 2001, first release was already in October 2001.
Initially running atop a much-modified version of [[Colin Frayn|Colin Frayn's]] open-source [[Beowulf]] infrastructure, there's very little of Beowulf that remains within Horizon and less with each release <ref>[http://www.horizonchess.com/pmwiki.php?n=Main.HomePage Horizon Chess - Main - Acknowledgements]</ref>.
=Search=
<ref>Features from [http://www.horizonchess.com/pmwiki.php?n=Main.EngineTechnicalDescription Horizon Chess - Main - EngineTechnicalDescription]</ref>
==Features==
* [[Iterative Deepening]]
* [[Aspiration Windows]] (Asymmetric on [[Side to move]])
* [[Principal Variation Search]]
* [[Move Ordering]]
** [[Internal Iterative Deepening]]
** [[Killer Heuristic]] with two [[Killer Move|Killers]] and one [[Mate Killers|Mate Killer]] per [[Ply]]
* [[Selectivity]]
** [[Extensions#FractionalExtensions|Fractional Extensions / Reductions]]
** [[Mate Threat Extensions]]
** [[One Reply Extensions]]
** [[Check Extensions]] ([[Discovered Check]])
** [[Recapture Extensions]]
** [[Passed Pawn Extensions|Passed Pawn Extensions (7th Rank)]]
** [[Quiescence Search]] with [[Check Extensions]]
** [[Null Move Pruning#AdaptiveNullMovePruning|Adaptive Null Move Pruning]] ([[Depth Reduction R|R]] 2-4.5, Up to 3 [[Null Move|Null Noves]] per Line)
** [[Null Move Pruning#ZugzwangVerification|Null Move Verification]]
** [[Futility Pruning]]
** [[Razoring|Adaptive Razoring]]
** [[Reductions]] (for non-dangerous moves)
=Tournament Play=
Horizon played the [[WCRCC 2007]] and [[WCRCC 2008]] Annual ACCA World Computer Rapid Chess Championship.
=Selected Games=
[[WCRCC 2008]], round 14, [[Horizon]] - [[Tornado]] <ref>[http://compchess.org/ACCAWCRCC/2008ACCAWCRCC/2008WCRCCResults.html 2008 Second Annual ACCA World Computer Chess Championships - Results - PGN-Download]</ref>
<pre>
[Event "WCRCC 2008"]
[Site "Internet Chess Club"]
[Date "2008.06.22"]
[Round "14"]
[White "Horizon"]
[Black "Tornado"]
[Result "1-0"]
1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7
9.O-O a6 10.a4 b4 11.Nb1 c5 12.Nbd2 cxd4 13.exd4 Be7 14.Nc4 O-O 15.Be3 Ng4
16.h3 Nxe3 17.fxe3 Rc8 18.Qe2 Qc7 19.e4 Kh8 20.Rac1 f6 21.Nfd2 e5 22.Nb3 exd4
23.Nca5 Qb8 24.Nxb7 Rxc1 25.Rxc1 Qxb7 26.Bxa6 Qa7 27.Bb5 d3+ 28.Qf2 Qxf2+
29.Kxf2 f5 30.Bxd7 fxe4+ 31.Kg1 e3 32.Bb5 d2 33.Rb1 Bf6 34.Be2 g6 35.a5 Be5
36.Bf3 Bxb2 37.a6 Rf7 38.a7 Rxa7 39.Rxb2 Rd7 40.Rb1 Rd3 41.Kf1 h5 42.Bd1 Rc3
43.Ke2 h4 44.Nd4 Rc5 45.Nc2 Rg5 46.Nxe3 Rb5 47.Rb3 Rb8 48.Bc2 Kg7 49.Kxd2 Rb5
1-0
</pre>
=See also=
* [[Horizon Effect]]
* [[Horizon Node]]
=External Links=
==Chess Engine==
* [http://www.horizonchess.com/pmwiki.php?n=Main.HomePage Horizon Chess - Main - Horizon Chess]
: [http://www.horizonchess.com/pmwiki.php?n=Main.EngineTechnicalDescription Horizon Chess - Main - EngineTechnicalDescription]
==Misc==
* [https://en.wikipedia.org/wiki/Horizon Horizon from Wikipedia]
* [https://en.wikipedia.org/wiki/Horizon_%28disambiguation%29 Horizon (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Horizon_effect Horizon effect from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:WinBoard]]
