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'''[[Main Page|Home]] * [[Engines]] * LarsenVB'''
'''LarsenVB''',<br/>
a [[WinBoard]] compliant [[Open Source Engines|open source chess engine]] written by [[Luca Dormio]] in [[Basic|Visual Basic]], inspired by the [[C]] program [[Faile]] by [[Adrien Regimbald]], and first released in October 1999 <ref>[http://www.reocities.com/TimesSquare/Chaos/9481/indexOld.html Golem's Page] by [[Gianluigi Masciulli]] ([http://www.reocities.com/ reocities])</ref>. LarsenVB participated at various [[Italian Computer Chess Championship|Italian Computer Chess Championships]], from [[CIPS 2001|2001]] until [[CCC 2008|2008]] .
=Description=
LarsenVB has a [[Mailbox]] board representation, and features most "classics" algorithms like [[Alpha-Beta|alpha-beta]], [[Iterative Deepening|iterative deepening]], and [[Quiescence Search|quiescence search]], while it still lacks a [[Transposition Table|transposition table]] and [[Null Move Pruning|null move pruning]]. The [[Evaluation|evaluation function]] is quite simple and considers [[Pawn Structure|pawn structure]], [[Center Control|basic centralization]] of minor pieces and [[King Centralization|King]] (in the [[Endgame|endgame]]), basic [[King Safety|King safety]] related to [[Castling|castling]], pawn structure and [[Open file|open files]] <ref>[http://xoomer.virgilio.it/ludormio/download_e.htm Downloads], Source code ver. 0.04.07, readme.txt</ref>.
=Selected Games=
[[CCC 2008]], round 3, [[LarsenVB]] - [[Raffaela]] <ref>[http://www.scaccomasco.com/tornei/2008/wwwCCC3/crosstbl.html Chess Computer Cup 2008 (PGN)]</ref>
<pre>
[Event "Chess Computer Cup 2008"]
[Site "Turin"]
[Date "2008.12.06"]
[Round "3"]
[White "LarsenVB"]
[Black "Raffaela"]
[Result "1-0"]
1.d4 d5 2.Nf3 Bf5 3.Bf4 f6 4.Nc3 Nc6 5.Nh4 Bg4 6.h3 Bh5 7.Nf3 e5 8.dxe5 d4
9.Nb5 g5 10.Bxg5 fxg5 11.g4 Bg6 12.Nbxd4 Qd5 13.Nxc6 Qxc6 14.Bg2 Bxc2 15.Qd2
Rd8 16.Qxg5 Qb5 17.O-O Qxb2 18.Nh4 Bh6 19.Qh5+ Kf8 20.e6 Ke7 21.Qf7+ Kd6
22.Rad1+ Bxd1 23.Rxd1+ Bd2 24.Nf5+ Kc5 25.Qxc7+ Kb4 26.Qxb7+ Kc3 27.Qc7+ Kb4
28.Qxd8 Ka3 29.e7 Nxe7 30.Qxe7+ Qb4 31.Rxd2 Qxe7 32.Nxe7 Rb8 33.Rd5 Rb1+
34.Bf1 Kxa2 35.Rh5 Rb7 36.Rxh7 Rb5 37.e4 Ra5 38.Nc6 Rc5 39.Rxa7+ Kb2 40.Rb7+
Ka3 41.Ra7+ Kb2 42.Ra6 Rg5 43.e5 Rg6 44.f4 Re6 45.Kh1 Re8 46.f5 Kc2 47.Ra2+
Kb3 48.Ra6 Kc3 49.Ra3+ Kb2 50.Ra7 Kc2 51.Rd7 Kc3 52.e6 Ra8 53.e7 Kc2 54.Ra7
Rc8 55.Nd8 Kb3 56. e8=Q Rc4 57.Qe6 Kc3 58.Qxc4+ Kd2 59.Qd3+ Kc1 60.Qc3+ Kd1
61.Ra1# 1-0
</pre>
=See also=
* [[ChessBrainVB]]
* [[Various Classifications#ChessLegend|Chess Legends]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30831 WinBoard Engine LarsenVB by Luca Dormio, Italy !] by [[Frank Quisinsky]], [[Computer Chess Forums|Winboard Forum]], February 05, 2000
* [https://www.stmintz.com/ccc/index.php?id=98792 LarsenVb wins the first italian computerchess tournament] by [[Gianluigi Masciulli]], [[CCC]], February 23, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=36319 LarsenVB 0.05 out] by [[Luca Dormio]], [[Computer Chess Forums|Winboard Forum]], March 04, 2002
* [https://www.stmintz.com/ccc/index.php?id=491794 LarsenVB download] by [[Michael Diosi]], [[CCC]], March 07, 2006
=External Links=
==Chess Engine==
* [http://xoomer.virgilio.it/ludormio/home_e.htm LarsenVB Home page]
: [http://xoomer.virgilio.it/ludormio/download_e.htm Downloads]
==Misc==
* [https://en.wikipedia.org/wiki/Larsen Larsen from Wikipedia]
* [https://en.wikipedia.org/wiki/Visual_Basic Visual Basic from Wikipedia]
* [https://en.wikipedia.org/wiki/Bent_Larsen Bent Larsen from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
'''LarsenVB''',<br/>
a [[WinBoard]] compliant [[Open Source Engines|open source chess engine]] written by [[Luca Dormio]] in [[Basic|Visual Basic]], inspired by the [[C]] program [[Faile]] by [[Adrien Regimbald]], and first released in October 1999 <ref>[http://www.reocities.com/TimesSquare/Chaos/9481/indexOld.html Golem's Page] by [[Gianluigi Masciulli]] ([http://www.reocities.com/ reocities])</ref>. LarsenVB participated at various [[Italian Computer Chess Championship|Italian Computer Chess Championships]], from [[CIPS 2001|2001]] until [[CCC 2008|2008]] .
=Description=
LarsenVB has a [[Mailbox]] board representation, and features most "classics" algorithms like [[Alpha-Beta|alpha-beta]], [[Iterative Deepening|iterative deepening]], and [[Quiescence Search|quiescence search]], while it still lacks a [[Transposition Table|transposition table]] and [[Null Move Pruning|null move pruning]]. The [[Evaluation|evaluation function]] is quite simple and considers [[Pawn Structure|pawn structure]], [[Center Control|basic centralization]] of minor pieces and [[King Centralization|King]] (in the [[Endgame|endgame]]), basic [[King Safety|King safety]] related to [[Castling|castling]], pawn structure and [[Open file|open files]] <ref>[http://xoomer.virgilio.it/ludormio/download_e.htm Downloads], Source code ver. 0.04.07, readme.txt</ref>.
=Selected Games=
[[CCC 2008]], round 3, [[LarsenVB]] - [[Raffaela]] <ref>[http://www.scaccomasco.com/tornei/2008/wwwCCC3/crosstbl.html Chess Computer Cup 2008 (PGN)]</ref>
<pre>
[Event "Chess Computer Cup 2008"]
[Site "Turin"]
[Date "2008.12.06"]
[Round "3"]
[White "LarsenVB"]
[Black "Raffaela"]
[Result "1-0"]
1.d4 d5 2.Nf3 Bf5 3.Bf4 f6 4.Nc3 Nc6 5.Nh4 Bg4 6.h3 Bh5 7.Nf3 e5 8.dxe5 d4
9.Nb5 g5 10.Bxg5 fxg5 11.g4 Bg6 12.Nbxd4 Qd5 13.Nxc6 Qxc6 14.Bg2 Bxc2 15.Qd2
Rd8 16.Qxg5 Qb5 17.O-O Qxb2 18.Nh4 Bh6 19.Qh5+ Kf8 20.e6 Ke7 21.Qf7+ Kd6
22.Rad1+ Bxd1 23.Rxd1+ Bd2 24.Nf5+ Kc5 25.Qxc7+ Kb4 26.Qxb7+ Kc3 27.Qc7+ Kb4
28.Qxd8 Ka3 29.e7 Nxe7 30.Qxe7+ Qb4 31.Rxd2 Qxe7 32.Nxe7 Rb8 33.Rd5 Rb1+
34.Bf1 Kxa2 35.Rh5 Rb7 36.Rxh7 Rb5 37.e4 Ra5 38.Nc6 Rc5 39.Rxa7+ Kb2 40.Rb7+
Ka3 41.Ra7+ Kb2 42.Ra6 Rg5 43.e5 Rg6 44.f4 Re6 45.Kh1 Re8 46.f5 Kc2 47.Ra2+
Kb3 48.Ra6 Kc3 49.Ra3+ Kb2 50.Ra7 Kc2 51.Rd7 Kc3 52.e6 Ra8 53.e7 Kc2 54.Ra7
Rc8 55.Nd8 Kb3 56. e8=Q Rc4 57.Qe6 Kc3 58.Qxc4+ Kd2 59.Qd3+ Kc1 60.Qc3+ Kd1
61.Ra1# 1-0
</pre>
=See also=
* [[ChessBrainVB]]
* [[Various Classifications#ChessLegend|Chess Legends]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30831 WinBoard Engine LarsenVB by Luca Dormio, Italy !] by [[Frank Quisinsky]], [[Computer Chess Forums|Winboard Forum]], February 05, 2000
* [https://www.stmintz.com/ccc/index.php?id=98792 LarsenVb wins the first italian computerchess tournament] by [[Gianluigi Masciulli]], [[CCC]], February 23, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=36319 LarsenVB 0.05 out] by [[Luca Dormio]], [[Computer Chess Forums|Winboard Forum]], March 04, 2002
* [https://www.stmintz.com/ccc/index.php?id=491794 LarsenVB download] by [[Michael Diosi]], [[CCC]], March 07, 2006
=External Links=
==Chess Engine==
* [http://xoomer.virgilio.it/ludormio/home_e.htm LarsenVB Home page]
: [http://xoomer.virgilio.it/ludormio/download_e.htm Downloads]
==Misc==
* [https://en.wikipedia.org/wiki/Larsen Larsen from Wikipedia]
* [https://en.wikipedia.org/wiki/Visual_Basic Visual Basic from Wikipedia]
* [https://en.wikipedia.org/wiki/Bent_Larsen Bent Larsen from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
