https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&feed=atom&action=history
Thor's Hammer - Revision history
2024-03-28T12:53:04Z
Revision history for this page on the wiki
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https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=24438&oldid=prev
GerdIsenberg at 09:31, 22 April 2021
2021-04-22T09:31:48Z
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=12923&oldid=prev
GerdIsenberg at 19:14, 3 July 2019
2019-07-03T19:14:30Z
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=11534&oldid=prev
GerdIsenberg at 20:34, 21 March 2019
2019-03-21T20:34:57Z
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://www.stmintz.com/ccc/index.php?id=418983 Gauntlet Thor's Hammer v2.25 and GES v1.36 - games] by [[Karl-Heinz Söntges]], [[CCC]], March 30, 2005</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://www.stmintz.com/ccc/index.php?id=418983 Gauntlet Thor's Hammer v2.25 and GES v1.36 - games] by [[Karl-Heinz Söntges]], [[CCC]], March 30, 2005</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=25286 Gosu 0.16 v Thor's Hammer 2.28 (queen sac)] by [[Graham Banks]], [[CCC]], December 06, 2008 » [[Gosu]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055 Jim, do you remember?] by [[Gabor Szots|Gábor Szots]], [[Computer Chess Forums|Winboard Forum]], March 26, 2009</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055 Jim, do you remember?] by [[Gabor Szots|Gábor Szots]], [[Computer Chess Forums|Winboard Forum]], March 26, 2009</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055&start=20#p190004 Re: Jim, do you remember?] by [[Jim Ablett]], [[Computer Chess Forums|Winboard Forum]], May 24, 2009</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055&start=20#p190004 Re: Jim, do you remember?] by [[Jim Ablett]], [[Computer Chess Forums|Winboard Forum]], May 24, 2009</div></td></tr>
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=8545&oldid=prev
GerdIsenberg at 20:24, 14 November 2018
2018-11-14T20:24:20Z
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 20:24, 14 November 2018</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|<del class="diffchange diffchange-inline">240px|  </del>Thor's Hammer <ref>''The third gift — an enormous hammer'' by [https://en.wikipedia.org/wiki/Elmer_Boyd_Smith Elmer Boyd Smith]. The [https://en.wikipedia.org/wiki/Dwarf_%28Germanic_mythology%29 dwarven] [https://en.wikipedia.org/wiki/Sons_of_Ivaldi Sons of Ivaldi] forge the [https://en.wikipedia.org/wiki/Mj%C3%B6lnir hammer Mjolnir] for the god [https://en.wikipedia.org/wiki/Thor Thor] while [https://en.wikipedia.org/wiki/Loki Loki] watches on. On the table before them sits their other creations: the multiplying ring [https://en.wikipedia.org/wiki/Draupnir Draupnir], the [https://en.wikipedia.org/wiki/Wild_boar boar] [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti], the ship [https://en.wikipedia.org/wiki/Sk%C3%AD%C3%B0bla%C3%B0nir Skíðblaðnir], the spear [https://en.wikipedia.org/wiki/Gungnir Gungnir], and [https://en.wikipedia.org/wiki/Golden_Hair golden hair] for the goddess [https://en.wikipedia.org/wiki/Sif Sif], Page 88 of [https://en.wikipedia.org/wiki/Abbie_Farwell_Brown Abbie Farwell Brown] ('''1902'''). ''[http://www.germanicmythology.com/works/EBOYDSMITHART.html In the Days of Giants: A Book of Norse Tales]''. Illustrations by Elmer Boyd Smith. [https://en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt Houghton, Mifflin & Co.], [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]</ref>. ]]  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb| Thor's Hammer <ref>''The third gift — an enormous hammer'' by [https://en.wikipedia.org/wiki/Elmer_Boyd_Smith Elmer Boyd Smith]. The [https://en.wikipedia.org/wiki/Dwarf_%28Germanic_mythology%29 dwarven] [https://en.wikipedia.org/wiki/Sons_of_Ivaldi Sons of Ivaldi] forge the [https://en.wikipedia.org/wiki/Mj%C3%B6lnir hammer Mjolnir] for the god [https://en.wikipedia.org/wiki/Thor Thor] while [https://en.wikipedia.org/wiki/Loki Loki] watches on. On the table before them sits their other creations: the multiplying ring [https://en.wikipedia.org/wiki/Draupnir Draupnir], the [https://en.wikipedia.org/wiki/Wild_boar boar] [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti], the ship [https://en.wikipedia.org/wiki/Sk%C3%AD%C3%B0bla%C3%B0nir Skíðblaðnir], the spear [https://en.wikipedia.org/wiki/Gungnir Gungnir], and [https://en.wikipedia.org/wiki/Golden_Hair golden hair] for the goddess [https://en.wikipedia.org/wiki/Sif Sif], Page 88 of [https://en.wikipedia.org/wiki/Abbie_Farwell_Brown Abbie Farwell Brown] ('''1902'''). ''[http://www.germanicmythology.com/works/EBOYDSMITHART.html In the Days of Giants: A Book of Norse Tales]''. Illustrations by Elmer Boyd Smith. [https://en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt Houghton, Mifflin & Co.], [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]</ref>. ]]  </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Thor's Hammer''', (Mjoelner)<br/></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Thor's Hammer''', (Mjoelner)<br/></div></td></tr>
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=8544&oldid=prev
GerdIsenberg at 20:22, 14 November 2018
2018-11-14T20:22:16Z
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Main Page|Home]] * [[Engines]] * Thor's Hammer'''</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Main Page|Home]] * [[Engines]] * Thor's Hammer'''</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|<del class="diffchange diffchange-inline">220px</del>|  Thor's Hammer <ref>''The third gift — an enormous hammer'' by [https://en.wikipedia.org/wiki/Elmer_Boyd_Smith Elmer Boyd Smith]. The [https://en.wikipedia.org/wiki/Dwarf_%28Germanic_mythology%29 dwarven] [https://en.wikipedia.org/wiki/Sons_of_Ivaldi Sons of Ivaldi] forge the [https://en.wikipedia.org/wiki/Mj%C3%B6lnir hammer Mjolnir] for the god [https://en.wikipedia.org/wiki/Thor Thor] while [https://en.wikipedia.org/wiki/Loki Loki] watches on. On the table before them sits their other creations: the multiplying ring [https://en.wikipedia.org/wiki/Draupnir Draupnir], the [https://en.wikipedia.org/wiki/Wild_boar boar] [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti], the ship [https://en.wikipedia.org/wiki/Sk%C3%AD%C3%B0bla%C3%B0nir Skíðblaðnir], the spear [https://en.wikipedia.org/wiki/Gungnir Gungnir], and [https://en.wikipedia.org/wiki/Golden_Hair golden hair] for the goddess [https://en.wikipedia.org/wiki/Sif Sif], Page 88 of [https://en.wikipedia.org/wiki/Abbie_Farwell_Brown Abbie Farwell Brown] ('''1902'''). ''[http://www.germanicmythology.com/works/EBOYDSMITHART.html In the Days of Giants: A Book of Norse Tales]''. Illustrations by Elmer Boyd Smith. [https://en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt Houghton, Mifflin & Co.], [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]</ref>. ]]  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|<ins class="diffchange diffchange-inline">240px</ins>|  Thor's Hammer <ref>''The third gift — an enormous hammer'' by [https://en.wikipedia.org/wiki/Elmer_Boyd_Smith Elmer Boyd Smith]. The [https://en.wikipedia.org/wiki/Dwarf_%28Germanic_mythology%29 dwarven] [https://en.wikipedia.org/wiki/Sons_of_Ivaldi Sons of Ivaldi] forge the [https://en.wikipedia.org/wiki/Mj%C3%B6lnir hammer Mjolnir] for the god [https://en.wikipedia.org/wiki/Thor Thor] while [https://en.wikipedia.org/wiki/Loki Loki] watches on. On the table before them sits their other creations: the multiplying ring [https://en.wikipedia.org/wiki/Draupnir Draupnir], the [https://en.wikipedia.org/wiki/Wild_boar boar] [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti], the ship [https://en.wikipedia.org/wiki/Sk%C3%AD%C3%B0bla%C3%B0nir Skíðblaðnir], the spear [https://en.wikipedia.org/wiki/Gungnir Gungnir], and [https://en.wikipedia.org/wiki/Golden_Hair golden hair] for the goddess [https://en.wikipedia.org/wiki/Sif Sif], Page 88 of [https://en.wikipedia.org/wiki/Abbie_Farwell_Brown Abbie Farwell Brown] ('''1902'''). ''[http://www.germanicmythology.com/works/EBOYDSMITHART.html In the Days of Giants: A Book of Norse Tales]''. Illustrations by Elmer Boyd Smith. [https://en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt Houghton, Mifflin & Co.], [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]</ref>. ]]  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Thor's Hammer''', (Mjoelner)<br/></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Thor's Hammer''', (Mjoelner)<br/></div></td></tr>
</table>
GerdIsenberg
https://www.chessprogramming.org/index.php?title=Thor%27s_Hammer&diff=8476&oldid=prev
GerdIsenberg: Created page with "'''Home * Engines * Thor's Hammer''' FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|220px| Thor's Hammer <ref>''Th..."
2018-11-12T21:48:43Z
<p>Created page with "'''<a href="/Main_Page" title="Main Page">Home</a> * <a href="/Engines" title="Engines">Engines</a> * Thor's Hammer''' FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|220px| Thor's Hammer <ref>''Th..."</p>
<p><b>New page</b></p><div>'''[[Main Page|Home]] * [[Engines]] * Thor's Hammer'''<br />
<br />
[[FILE:The third gift — an enormous hammer by Elmer Boyd Smith.jpg|border|right|thumb|220px| Thor's Hammer <ref>''The third gift — an enormous hammer'' by [https://en.wikipedia.org/wiki/Elmer_Boyd_Smith Elmer Boyd Smith]. The [https://en.wikipedia.org/wiki/Dwarf_%28Germanic_mythology%29 dwarven] [https://en.wikipedia.org/wiki/Sons_of_Ivaldi Sons of Ivaldi] forge the [https://en.wikipedia.org/wiki/Mj%C3%B6lnir hammer Mjolnir] for the god [https://en.wikipedia.org/wiki/Thor Thor] while [https://en.wikipedia.org/wiki/Loki Loki] watches on. On the table before them sits their other creations: the multiplying ring [https://en.wikipedia.org/wiki/Draupnir Draupnir], the [https://en.wikipedia.org/wiki/Wild_boar boar] [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti], the ship [https://en.wikipedia.org/wiki/Sk%C3%AD%C3%B0bla%C3%B0nir Skíðblaðnir], the spear [https://en.wikipedia.org/wiki/Gungnir Gungnir], and [https://en.wikipedia.org/wiki/Golden_Hair golden hair] for the goddess [https://en.wikipedia.org/wiki/Sif Sif], Page 88 of [https://en.wikipedia.org/wiki/Abbie_Farwell_Brown Abbie Farwell Brown] ('''1902'''). ''[http://www.germanicmythology.com/works/EBOYDSMITHART.html In the Days of Giants: A Book of Norse Tales]''. Illustrations by Elmer Boyd Smith. [https://en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt Houghton, Mifflin & Co.], [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]</ref>. ]] <br />
<br />
'''Thor's Hammer''', (Mjoelner)<br/><br />
a [[WinBoard]] compatible [[:Category:Open Source|open source chess engine]] by [[Toma Roncevic]] written in [[Cpp|C++]], first released in December 2002. Mjoelner participated at the ''2nd Italian Engine Contest'' played on-line in 2001/2002 <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=35745 2nd "Italian Chess Engine Contest", (last round results)] by [[Gianluigi Masciulli|gianluigi]], [[Computer Chess Forums|Winboard Forum]], January 14, 2002</ref>, and Thor's Hammer played the [[CIPS 2003]] with 3½/7. Thor's Hammer is available from [[Jim Ablett|Jim Ablett's]] Winboard Chess Projects site, who also reported a huge speed gain of the 64-bit over the 32-bit build <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055&start=20#p190004 Re: Jim, do you remember?] by [[Jim Ablett]], [[Computer Chess Forums|Winboard Forum]], May 24, 2009</ref>, which is quite typical for [[Bitboards|bitboard]] engines. <br />
<br />
=Description=<br />
==Move Generation==<br />
<span id="MoveGeneration"></span>Thor's Hammer is a [[Bitboards|bitboard]] engine without explicitly [[BitScan|scanning bits]] of set-wise [[Attacks|attack]] [[General Setwise Operations#Intersection|intersections]], in particular [[Sliding Piece Attacks|sliding piece attacks]]. It applies a [[Move Generation#Staged|staged move generation]] with [[Square Attacked By#LegalityTest|testing legality]] of [[Hash Move|hash-]] and [[Killer Move|killer moves]]. Otherwise, it generates [[Quiet Moves|quiet moves]] of [[Sliding Pieces|sliding pieces]] loop-wise for each [[Direction#RayDirections|ray-direction]]. Even sliding [[Captures|captures]] are generated quite similar to the [[Vector Attacks#NewArchitecture|blocker loop]] of a [[Vector Attacks|vector attack]] [[Board Representation#SquareCentric|array representation]], but with the important difference that testing the capture condition is done before entering the loop rather than after loop execution. If the intersection of the [[On an empty Board#NegativeRays|negative rays]] [[Origin Square|from a square]] with the opponent pieces as capture target is greater than the intersection with own pieces, a capture is possible on that ray.<br />
<pre><br />
south east (f6) & opponent pieces & own pieces<br />
. . . . . . . . . . . . . . . . . . . . . . . . <br />
. . . . . . . . . . . . . . . . . . . . . . . . <br />
. . . . . . . . . . . . . . . . . . . . . . . . <br />
. . . . 1 . . . . . . . . . . . . . . . . . . . <br />
. . . 1 . . . . . . . 1 . . . . > . . . . . . . . <br />
. . 1 . . . . . . . . . . . . . . . . . . . . . <br />
. 1 . . . . . . . . . . . . . . . 1 . . . . . . <br />
1 . . . . . . . . . . . . . . . 1 . . . . . . . <br />
</pre><br />
To apply the same trick for the [[On an empty Board#PositiveRays|positive rays]], [[Incremental Updates|incremental updated]] [[Reverse Bitboards|reverse bitboards]] are used <ref>thorshammer-229-ja.zip, Position.cpp, line 1329, slightly edited</ref>:<br />
<pre><br />
if(ptype[color][i]==BISHOP || ptype[color][i]==QUEEN) {<br />
fmask=~omask;<br />
if((seFrom[xp]&omask) > (seFrom[xp]&nmask)) {<br />
c=xp-7;<br />
while((setBit(c) & (fmask))) c-=7;<br />
*moves++ = setMove(i,c);<br />
}<br />
if((seFrom[63-xp]&orotmask) > (seFrom[63-xp]&nrotmask)) {<br />
c=xp+7;<br />
while((setBit(c) & (fmask))) c+=7;<br />
*moves++ = setMove(i,c);<br />
}<br />
if( ...<br />
}<br />
...<br />
</pre><br />
On processors with slow bitscan, i.e. [[Intel|Intel's]] [[x86]] [https://en.wikipedia.org/wiki/NetBurst_%28microarchitecture%29 NetBurst microarchitecture], the compact scan loops to skip empty squares inside the [https://en.wikipedia.org/wiki/Pipeline_%28computing%29 instruction pipeline] should not that much slower on average.<br />
<br />
==Search==<br />
The [[Search|search]] relies on [[Iterative Deepening|iterative deepening]] with [[Aspiration Windows|aspiration windows]] and [[Principal Variation Search|PVS]], [[Transposition Table|transpostion table]], [[Null Move Pruning#AdaptiveNullMovePruning|adaptive null move pruning]], [[Internal Iterative Deepening|internal iterative deepening]], [[Check Extensions|check-]], [[Passed Pawn Extensions|passed pawn-]] and [[Recapture Extensions|recapture extensions]].<br />
<br />
==Evaluation==<br />
[[Evaluation]] counts [[Material|material]] and positionally considers [[Pawn Structure|pawn structure]] utilizing a [[Pawn Hash Table|pawn hash table]], [[Passed Pawn|passed pawns]] including [[Rule of the Square|rule of the square]] in the [[Pawn Endgame|pawn endings]], [[King Safety|king safety]] in the [[Middlegame|middlegame]] and [[King Centralization|centralization]] in the [[Endgame|endgame]], [[Mobility|mobility]] and multiple other features.<br />
<br />
=See also=<br />
* [[Freyr]]<br />
<br />
=Forum Posts=<br />
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=601 Thor's Hammer new version] by [[Toma Roncevic|toma]], [[Computer Chess Forums|Winboard Forum]], November 15, 2004<br />
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=1644&p=7640 Thor's Hammer 2.25] by [[Toma Roncevic|toma]], [[Computer Chess Forums|Winboard Forum]], February 14, 2005 <br />
* [https://www.stmintz.com/ccc/index.php?id=418983 Gauntlet Thor's Hammer v2.25 and GES v1.36 - games] by [[Karl-Heinz Söntges]], [[CCC]], March 30, 2005<br />
* [https://www.stmintz.com/ccc/index.php?id=439476 Gauntlets Liste B 5' + 5" Thor's Hammer v2.28 - games] by [[Karl-Heinz Söntges]], [[CCC]], August 01, 2005<br />
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055 Jim, do you remember?] by [[Gabor Szots|Gábor Szots]], [[Computer Chess Forums|Winboard Forum]], March 26, 2009<br />
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50055&start=20#p190004 Re: Jim, do you remember?] by [[Jim Ablett]], [[Computer Chess Forums|Winboard Forum]], May 24, 2009<br />
<br />
=External Links=<br />
==Chess Engine==<br />
* [http://web.archive.org/web/20060614102734/http://www.geocities.com/toma_st/thorshammer.html Thor's Hammer Home Page] archived by the [https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine] (June 2006)<br />
* [http://kirr.homeunix.org/chess/engines/Jim%20Ablett/THORS%20HAMMER/ Index of /chess/engines/Jim Ablett/THORS HAMMER] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]<br />
* [http://kirill-kryukov.com/chess/kcec/cgi/engine_details.cgi?print=Details&eng=Thor%27s%20Hammer%202.28%2032-bit#Thor_s_Hammer_2_28_32-bit Thor's Hammer 2.28 32-bit] in [[KCEC]]<br />
* [http://www.computerchess.org.uk/ccrl/404/cgi/compare_engines.cgi?family=Thor%27s%20Hammer&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 Thor's Hammer] in [[CCRL|CCRL 40/4]]<br />
==Misc==<br />
* [https://en.wikipedia.org/wiki/Thor%27s_Hammer_%28disambiguation%29 Thor's Hammer (disambiguation) from Wikipedia]<br />
* [https://en.wikipedia.org/wiki/Mj%C3%B6lnir Mjölnir from Wikipedia]<br />
* [https://en.wikipedia.org/wiki/Mjolnir_%28comics%29 Mjolnir (comics) from Wikipedia]<br />
* [https://en.wikipedia.org/wiki/Thor Thor from Wikipedia]<br />
* [https://en.wikipedia.org/wiki/Hammer Hammer from Wikipedia]<br />
* [https://en.wikipedia.org/wiki/Hammer_of_Thor_%28monument%29 Hammer of Thor (monument) from Wikipedia]<br />
* [http://www.alexgitlin.com/npp/thors.htm Thors Hammer] - Evasive Dreams Beyond, 1971, [https://en.wikipedia.org/wiki/YouTube YouTube] Video <br />
: {{#evu:https://www.youtube.com/watch?v=TiNWCeuWT2c|alignment=left|valignment=top}}<br />
<br />
=References= <br />
<references /><br />
'''[[Engines|Up one level]]'''<br />
[[Category:Open Source]]<br />
[[Category:WinBoard]]<br />
[[Category:Comics]]<br />
[[Category:Mythology]]<br />
[[Category:Music]]</div>
GerdIsenberg