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Created page with "'''Home * People * Stef Keetman''' FILE:StefKeetman.jpg|border|right|thumb|link=https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se..."
'''[[Main Page|Home]] * [[People]] * Stef Keetman'''
[[FILE:StefKeetman.jpg|border|right|thumb|link=https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12| Stef Keetman <ref>[https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]</ref> ]]
'''Stef Keetman''',<br/>
a Dutch computer scientist, Draughts programmer and software developer in the [https://en.wikipedia.org/wiki/Systematic_trading systematic trading] field,
where he applies techniques of [[Artificial Intelligence|AI]]. He holds a M.Sc. in computer science from the [https://en.wikipedia.org/wiki/University_of_Amsterdam University of Amsterdam]
<ref>[https://www.bloomberg.com/profile/person/18869762 Stef Keetman, HiQ Invest: Profile and Biography - Bloomberg Markets]</ref>.
=Draughts=
During the late 80s and early 90s, while affiliated with the [[Maastricht University|University of Limburg]] and its upcoming ''Games and AI Group'' headed by [[Jaap van den Herik]], also as [[Draughts]] player <ref>[https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]</ref>,
he wrote the Draughts program [https://www.game-ai-forum.org/icga-tournaments/program.php?id=346 Truus]
<ref>[http://windames.free.fr/truus_e.html Truus]</ref> <ref>[https://nl.wikipedia.org/wiki/Truus_(dammen) Truus (dammen) - Wikipedia.nl] (Dutch)</ref>, winner of the Silver medal at the [[1st Computer Olympiad#Draughts|1st Computer Olympiad, London 1989]], and the Gold medal at the [[3rd Computer Olympiad#Draughts|3rd Computer Olympiad, Maastricht 1991]].
Along with [[Ard van Bergen]], he developed the Draughts engine for [[Oxford Softworks|Oxford Softworks']] ''Intelligent Strategy Games 10'' <ref>[https://www.mobygames.com/game/dos/intelligent-strategy-games-10/credits Intelligent Strategy Games 10 (1993) DOS credits] - [https://en.wikipedia.org/wiki/MobyGames MobyGames]</ref>.
=Improving Chinook=
During his half year [https://en.wikipedia.org/wiki/Sabbatical sabbatical] in [[Maastricht University|Maastricht]] in early 1994 with the aim to prepare and improve his [[Checkers]] player [https://en.wikipedia.org/wiki/Chinook_(draughts_player) Chinook] for the 2nd upcoming [https://en.wikipedia.org/wiki/Marion_Tinsley Tinsley] match,
[[Jonathan Schaeffer]] worked along with Stef Keetman to profit from some of his ideas implemented in Truus. One of Truus' novel features was the extensive use of [[Tactics|tactical]] patterns in the [[Evaluation|evaluation]] function, and its ability to [[Learning|learn]] Draught tactics.
When Truus found a forced sequence of moves that won a checker, the program would remember the conditions necessary for the sequence to work. The so called two-for-one pattern, where a sacrifice of a checker due to the mandatory capture allows recapturing two or more checkers by successive jumps, was adapted to Chinook.
Many conditions and exceptions had to be considered which was quite error prone - therefore the possible inexact pattern match was not used in evaluation, but to trigger an [[Extensions|extension]], improving Chinook's strength considerably
<ref>[[Jonathan Schaeffer]] ('''1997, 2009'''). ''[http://www.springer.com/computer/ai/book/978-0-387-76575-4 One Jump Ahead]''. 19. Home Away From Home, pp. 365-371</ref>.
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/person.php?id=315 Stef Keetman's ICGA Tournaments]
* [https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]
* [http://endgamesandmore.blogspot.de/2016/03/stef-keetman-truus-ton-sijbrands-and.html End games and more: Stef Keetman, Truus, Ton Sijbrands and Jaap Bus cooperating independently] by [[Jaap Bus]], March 02, 2016
* [https://www.waagtoren.nl/author/stef-keetman/ Stef Keetman – De Waagtoren]
* [https://www2.computerworld.nl/business-intelligence/76259-7-vragen-aan----hiqinvest 7 vragen aan... HiQinvest - Computerworld], April 12, 2013 (Dutch)
=References=
<references />
'''[[People|Up one level]]'''
[[Category:Checkers Programmer|Keetman]]
[[Category:Draughts Programmer|Keetman]]
[[Category:Chess Player|Keetman]]
[[Category:Draughts Player|Keetman]]
[[FILE:StefKeetman.jpg|border|right|thumb|link=https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12| Stef Keetman <ref>[https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]</ref> ]]
'''Stef Keetman''',<br/>
a Dutch computer scientist, Draughts programmer and software developer in the [https://en.wikipedia.org/wiki/Systematic_trading systematic trading] field,
where he applies techniques of [[Artificial Intelligence|AI]]. He holds a M.Sc. in computer science from the [https://en.wikipedia.org/wiki/University_of_Amsterdam University of Amsterdam]
<ref>[https://www.bloomberg.com/profile/person/18869762 Stef Keetman, HiQ Invest: Profile and Biography - Bloomberg Markets]</ref>.
=Draughts=
During the late 80s and early 90s, while affiliated with the [[Maastricht University|University of Limburg]] and its upcoming ''Games and AI Group'' headed by [[Jaap van den Herik]], also as [[Draughts]] player <ref>[https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]</ref>,
he wrote the Draughts program [https://www.game-ai-forum.org/icga-tournaments/program.php?id=346 Truus]
<ref>[http://windames.free.fr/truus_e.html Truus]</ref> <ref>[https://nl.wikipedia.org/wiki/Truus_(dammen) Truus (dammen) - Wikipedia.nl] (Dutch)</ref>, winner of the Silver medal at the [[1st Computer Olympiad#Draughts|1st Computer Olympiad, London 1989]], and the Gold medal at the [[3rd Computer Olympiad#Draughts|3rd Computer Olympiad, Maastricht 1991]].
Along with [[Ard van Bergen]], he developed the Draughts engine for [[Oxford Softworks|Oxford Softworks']] ''Intelligent Strategy Games 10'' <ref>[https://www.mobygames.com/game/dos/intelligent-strategy-games-10/credits Intelligent Strategy Games 10 (1993) DOS credits] - [https://en.wikipedia.org/wiki/MobyGames MobyGames]</ref>.
=Improving Chinook=
During his half year [https://en.wikipedia.org/wiki/Sabbatical sabbatical] in [[Maastricht University|Maastricht]] in early 1994 with the aim to prepare and improve his [[Checkers]] player [https://en.wikipedia.org/wiki/Chinook_(draughts_player) Chinook] for the 2nd upcoming [https://en.wikipedia.org/wiki/Marion_Tinsley Tinsley] match,
[[Jonathan Schaeffer]] worked along with Stef Keetman to profit from some of his ideas implemented in Truus. One of Truus' novel features was the extensive use of [[Tactics|tactical]] patterns in the [[Evaluation|evaluation]] function, and its ability to [[Learning|learn]] Draught tactics.
When Truus found a forced sequence of moves that won a checker, the program would remember the conditions necessary for the sequence to work. The so called two-for-one pattern, where a sacrifice of a checker due to the mandatory capture allows recapturing two or more checkers by successive jumps, was adapted to Chinook.
Many conditions and exceptions had to be considered which was quite error prone - therefore the possible inexact pattern match was not used in evaluation, but to trigger an [[Extensions|extension]], improving Chinook's strength considerably
<ref>[[Jonathan Schaeffer]] ('''1997, 2009'''). ''[http://www.springer.com/computer/ai/book/978-0-387-76575-4 One Jump Ahead]''. 19. Home Away From Home, pp. 365-371</ref>.
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/person.php?id=315 Stef Keetman's ICGA Tournaments]
* [https://toernooibase.kndb.nl/opvraag/liddetailp.php?taal=&Id=8&SpId=994&se=12 Toernooibase Dammen - Noord-Hollandse DamBond]
* [http://endgamesandmore.blogspot.de/2016/03/stef-keetman-truus-ton-sijbrands-and.html End games and more: Stef Keetman, Truus, Ton Sijbrands and Jaap Bus cooperating independently] by [[Jaap Bus]], March 02, 2016
* [https://www.waagtoren.nl/author/stef-keetman/ Stef Keetman – De Waagtoren]
* [https://www2.computerworld.nl/business-intelligence/76259-7-vragen-aan----hiqinvest 7 vragen aan... HiQinvest - Computerworld], April 12, 2013 (Dutch)
=References=
<references />
'''[[People|Up one level]]'''
[[Category:Checkers Programmer|Keetman]]
[[Category:Draughts Programmer|Keetman]]
[[Category:Chess Player|Keetman]]
[[Category:Draughts Player|Keetman]]
