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'''[[Main Page|Home]] * [[Engines]] * Shallow Blue'''
[[FILE:Blue9 - Flickr - mrbill.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Light-emitting_diode#blue_LED Blue LED] fun <ref>[https://www.flickr.com/photos/mrbill/34651005/ Blue LED fun], taken on August 16, 2005, by [https://www.flickr.com/people/41894183508@N01 Bill Bradford], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Shallow Blue''',<br/>
an [[UCI]] compliant [[:Category:Open Source|open source chess engine]] by [[Rhys Rustad-Elliott]], written in [[Cpp|C++ 11]], and first released in 2017.
Shallow Blue lacks various standard [[Pruning|pruning]] and [[Reductions|reductions]] heuristics such as [[Null Move Pruning|null move pruning]] and [[Late Move Reductions|LMR]],
and can therefore considered as didactic engine with some prospects to improve.
=Features=
<ref>[https://github.com/GunshipPenguin/shallow-blue#features GitHub - GunshipPenguin / shallow-blue | Features]</ref>
==[[Board Representation]]==
* [[Bitboards]]
* [[Magic Bitboards]] <ref>[https://rhysre.net/fast-chess-move-generation-with-magic-bitboards.html Fast Chess Move Generation With Magic Bitboards] by [[Rhys Rustad-Elliot]]</ref>
==[[Search]]==
* [[Iterative Deepening]]
* [[Principal Variation Search]]
* [[Transposition Table]]
* [[Move Ordering]]
** [[PV-Move]]
** [[Captures]] by [[MVV-LVA|MVV/LVA]]
** [[Killer Heuristic]]
** [[History Heuristic]]
* [[Selectivity]]
** [[Check Extensions]]
** [[Quiescence Search]]
==[[Evaluation]]==
* [[Tapered Eval]]
* [[Material]]
** [[Bishop Pair]]
* [[Piece-Square Tables]]
* [[Mobility]]
** [[Rook on Open File|Rooks on (Semi) Open Files]]
* [[Pawn Structure]]
* [[King Safety]]
=See also=
* [[Deep Blue]]
* [[Deep Pink]]
=Forum Posts=
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=64587 Shallow Blue Chess 1.01 (UCI) x64] by [[Norbert Raimund Leisner]], [[CCC]], July 13, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75605 Rustic vs. Shallow Blue: one of us is weird somehow] by [[Marcel Vanthoor]], [[CCC]], October 30, 2020
=External Links=
==Chess Engine==
* [https://github.com/GunshipPenguin/shallow-blue GitHub - GunshipPenguin / shallow-blue]
* [https://ccrl.chessdom.com/ccrl/404/cgi/compare_engines.cgi?family=Shallowblue&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Shallow Blue] in [[CCRL|CCRL Blitz]]
* [https://ccrl.chessdom.com/ccrl/4040/cgi/compare_engines.cgi?family=Shallowblue&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Shallow Blue] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wiktionary.org/wiki/shallow shallow - Wiktionary]
* [https://en.wiktionary.org/wiki/blue blue - Wiktionary]
* [https://en.wikipedia.org/wiki/Blue Blue from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:UCI]]
[[Category:PC]]
[[Category:Linux]]
[[Category:Windows]]
[[Category:X64]]
[[FILE:Blue9 - Flickr - mrbill.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Light-emitting_diode#blue_LED Blue LED] fun <ref>[https://www.flickr.com/photos/mrbill/34651005/ Blue LED fun], taken on August 16, 2005, by [https://www.flickr.com/people/41894183508@N01 Bill Bradford], [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Shallow Blue''',<br/>
an [[UCI]] compliant [[:Category:Open Source|open source chess engine]] by [[Rhys Rustad-Elliott]], written in [[Cpp|C++ 11]], and first released in 2017.
Shallow Blue lacks various standard [[Pruning|pruning]] and [[Reductions|reductions]] heuristics such as [[Null Move Pruning|null move pruning]] and [[Late Move Reductions|LMR]],
and can therefore considered as didactic engine with some prospects to improve.
=Features=
<ref>[https://github.com/GunshipPenguin/shallow-blue#features GitHub - GunshipPenguin / shallow-blue | Features]</ref>
==[[Board Representation]]==
* [[Bitboards]]
* [[Magic Bitboards]] <ref>[https://rhysre.net/fast-chess-move-generation-with-magic-bitboards.html Fast Chess Move Generation With Magic Bitboards] by [[Rhys Rustad-Elliot]]</ref>
==[[Search]]==
* [[Iterative Deepening]]
* [[Principal Variation Search]]
* [[Transposition Table]]
* [[Move Ordering]]
** [[PV-Move]]
** [[Captures]] by [[MVV-LVA|MVV/LVA]]
** [[Killer Heuristic]]
** [[History Heuristic]]
* [[Selectivity]]
** [[Check Extensions]]
** [[Quiescence Search]]
==[[Evaluation]]==
* [[Tapered Eval]]
* [[Material]]
** [[Bishop Pair]]
* [[Piece-Square Tables]]
* [[Mobility]]
** [[Rook on Open File|Rooks on (Semi) Open Files]]
* [[Pawn Structure]]
* [[King Safety]]
=See also=
* [[Deep Blue]]
* [[Deep Pink]]
=Forum Posts=
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=64587 Shallow Blue Chess 1.01 (UCI) x64] by [[Norbert Raimund Leisner]], [[CCC]], July 13, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75605 Rustic vs. Shallow Blue: one of us is weird somehow] by [[Marcel Vanthoor]], [[CCC]], October 30, 2020
=External Links=
==Chess Engine==
* [https://github.com/GunshipPenguin/shallow-blue GitHub - GunshipPenguin / shallow-blue]
* [https://ccrl.chessdom.com/ccrl/404/cgi/compare_engines.cgi?family=Shallowblue&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Shallow Blue] in [[CCRL|CCRL Blitz]]
* [https://ccrl.chessdom.com/ccrl/4040/cgi/compare_engines.cgi?family=Shallowblue&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Shallow Blue] in [[CCRL|CCRL 40/15]]
==Misc==
* [https://en.wiktionary.org/wiki/shallow shallow - Wiktionary]
* [https://en.wiktionary.org/wiki/blue blue - Wiktionary]
* [https://en.wikipedia.org/wiki/Blue Blue from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:UCI]]
[[Category:PC]]
[[Category:Linux]]
[[Category:Windows]]
[[Category:X64]]
