Revisiting Nolot Problems

[induktio]

http://en.wikipedia.org/wiki/Nolot

Take a look at the problem #6:
rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b kq - 0 1<script type="text/javascript"> document.getElementById(pgn4webTextareaId).value = document.getElementById(pgn4webTextareaId).value.replace(/<\s*br\s*\/>/gi, ' '); multiGamesRegexp = /\s*\[\s*\w+\s*"[^"]*"\s*\]\s*[^\s\[\]]+[\s\S]*\[\s*\w+\s*"[^"]*"\s*\]\s*/m; if (multiGamesRegexp.test(document.getElementById(pgn4webTextareaId).value)) { height = 310; } else { height = 276; } document.write("<div style=\"width: 450px; text-align: left; font-family: Verdana, Arial; font-size: x-small;\">FEN: " + document.getElementById(pgn4webTextareaId).value + "<iframe src='/pgn4web/board.html?am=n&d=3000&ss=36&ps=d&pf=u&lcs=VdyD&dcs=LHCg&bbcs=LHCg&hm=s&hcs=QtmS&bd=h&hd=j&md=j&tm=18&fhcs=$$$$&fhs=100p&fmcs=$$$$&fccs=v71$&hmcs=M___&fms=100p&fcs=m&cd=i&bcs=VdyD&fp=18&hl=t&fh=b&fw=p&fs=" + document.getElementById(pgn4webTextareaId).value + "' height='340px' width='100%' frameborder='0' scrolling='no' marginheight='0' marginwidth='0'>your web browser and/or your host do not support iframes as required to display the chessboard</script> <blockquote class="uncited"><div>13... axb5!! offers a rook to keep the white queen out of play. 14.Qxa8 Bd4 15.Nxd4 cxd4 16.Qxb8 0-0! 17.Ke1 Qh4 18.g3 Qf6 19.Bf4 g5? (Ivanchuk found 19...d3! during post-game analysis.) 20.Rc1 exf4 21.Qxf4 Qd4 22.Rd1 bxc4 23.e5 Qc3+ 24.Rd2 Re8 25.Bxd3 cxd3 -+<br> <br> Tasc R30 finds 19... d3! in 2 1/2 hours. 19... Bf5!! is even stronger than 19... d3.</div></blockquote> Now, this is probably the hardest problem of them all. So here's Crafty 23.4 analysis:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>29 591:43 1.23 1. ... Bd7 2. h3 Bd4 3. Nfxd4 cxd4 4. hxg4 Qb6 5. Ke1 O-O 6. g5 Qg6 7. Bd3 axb5 8. Qxa8 bxc4 9. Bxc4 Qxe4+ 10. Kf2 d3 11. Be3 Qf5+ 12. Kg3 Qg4+ 13. Kh2 Qh4+ 14. Kg1 Qxc4 15. Qxb7 e4 16. Kf2 Qc2+ 17. Kg3 Qe2 18. Bc5 (s=9) 29 770:36 -1 1. ... axb5! 29 1061:39 1.05 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bb2 Rc8 10. Bd3 Nd7 11. Qd2 Qb6 12. h3 Bxf3+ 13. gxf3 Be3 14. Qb4 Nc5 15. Bc4 Qd6 16. Ke1 (s=7) 29-> 1260:45 1.05 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bb2 Rc8 10. Bd3 Nd7 11. Qd2 Qb6 12. h3 Bxf3+ 13. gxf3 Be3 14. Qb4 Nc5 15. Bc4 Qd6 16. Ke1 (s=2) 30 1523:17 1.10 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bd3 Nd7 10. h3 Nc5 11. Be2 Bxf3 12. Bxf3 Bd4 13. Rf1 Nd3 14. Qb1 Rc8 15. Bd2 Nb2+ 16. Ke1 Qc4 17. Bg4 30-> 3311:28 1.10 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bd3 Nd7 10. h3 Nc5 11. Be2 Bxf3 12. Bxf3 Bd4 13. Rf1 Nd3 14. Qb1 Rc8 15. Bd2 Nb2+ 16. Ke1 Qc4 17. Bg4 (s=6) </code></pre></div> Crafty seems to think 15.Nxd4 is inferior to Ra2, and 16.Qxb8 is a slight mistake. That is, after 14...Bd4 Crafty seems to prefer entirely different lines than those on the wiki page. Any other engines agree? Be2 Bxf3 12</div> </div> </div> <div class="back2top"> <a href="#top" class="top" title="Top"> <i class="icon fa-chevron-circle-up fa-fw icon-gray" aria-hidden="true"></i> <span class="sr-only">Top</span> </a> </div> </div> </div> <hr class="divider" /> <div id="p15485" class="post has-profile bg1"> <div class="inner"> <dl class="postprofile" id="profile15485"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=148&sid=e01609816488d23b099037f20b431b3a" class="username">zullil</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=148&sr=posts&sid=e01609816488d23b099037f20b431b3a">82</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Thu Jun 10, 2010 10:17 am</dd> <dd class="profile-custom-field profile-realname"><strong>Real Name:</strong> Louis Zulli</dd> <dd class="profile-custom-field profile-phpbb_location"><strong>Location:</strong> Pennsylvania, USA</dd> </dl> <div class="postbody"> <div id="post_content15485"> <h3 ><a href="#p15485">Re: Revisiting Nolot Problems</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=15485&sid=e01609816488d23b099037f20b431b3a" title="Reply with quote" class="button button-icon-only"> <i class="icon fa-quote-left fa-fw" aria-hidden="true"></i><span class="sr-only">Quote</span> </a> </li> </ul> <p class="author"> <a class="unread" href="./viewtopic.php?p=15485&sid=e01609816488d23b099037f20b431b3a#p15485" title="Post"> <i class="icon fa-file fa-fw icon-lightgray icon-md" aria-hidden="true"></i><span class="sr-only">Post</span> </a> <span class="responsive-hide">by <strong><a href="./memberlist.php?mode=viewprofile&u=148&sid=e01609816488d23b099037f20b431b3a" class="username">zullil</a></strong> » </span>Tue Jan 03, 2012 10:35 pm </p> <div class="content"><blockquote><div><cite>induktio wrote:</cite> 30-> 3311:28 1.10 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7<br> 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2<br> 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bd3 Nd7<br> 10. h3 Nc5 11. Be2 Bxf3 12. Bxf3 Bd4<br> 13. Rf1 Nd3 14. Qb1 Rc8 15. Bd2 Nb2+<br> 16. Ke1 Qc4 17. Bg4 (s=6)<br> [/code]<br> Crafty seems to think 15.Nxd4 is inferior to Ra2, and 16.Qxb8 is a slight mistake. That is, after 14...Bd4 Crafty seems to prefer entirely different lines than those on the wiki page. Any other engines agree? Be2 Bxf3 12</div></blockquote> Is that correct? You ran Crafty for 55 hours? <img class="smilies" src="./images/smilies/icon_eek.gif" width="15" height="17" alt=":shock:" title="Shocked"> <br> <br> Here's what Critter-1.4 (8 threads) gives after about 1 hour:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>23/67 59:31 32583304138 9124195 +0.00 axb5 Qxa8 Qc7 Rb1 Bd4 bxc5 Bxc5 Rxb5 Nd7 Qa4 O-O Qc2 f5 exf5 e4 Ng5 Rxf5 Ke1 Ndf6 Be2 Bf2+ Kd1 Bd4 Nh3 Ne3+ Bxe3 Bxe3 g4 Re5 Qb3 Rxd5+ Rxd5 Nxd5 Nf2 Qc5 Nxe4 Qd4+ Qd3 Qa1+ Kc2 Qa2+ Kd1 Qa1+ </code></pre></div> I'll let the search continue for a while.</div> </div> </div> <div class="back2top"> <a href="#top" class="top" title="Top"> <i class="icon fa-chevron-circle-up fa-fw icon-gray" aria-hidden="true"></i> <span class="sr-only">Top</span> </a> </div> </div> </div> <hr class="divider" /> <div id="p15489" class="post has-profile bg2"> <div class="inner"> <dl class="postprofile" id="profile15489"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=480&sid=e01609816488d23b099037f20b431b3a" class="username">ernest</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=480&sr=posts&sid=e01609816488d23b099037f20b431b3a">247</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Thu Sep 02, 2010 10:33 am</dd> </dl> <div class="postbody"> <div id="post_content15489"> <h3 ><a href="#p15489">Re: Revisiting Nolot Problems</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=15489&sid=e01609816488d23b099037f20b431b3a" title="Reply with quote" class="button button-icon-only"> <i class="icon fa-quote-left fa-fw" aria-hidden="true"></i><span class="sr-only">Quote</span> </a> </li> </ul> <p class="author"> <a class="unread" href="./viewtopic.php?p=15489&sid=e01609816488d23b099037f20b431b3a#p15489" title="Post"> <i class="icon fa-file fa-fw icon-lightgray icon-md" aria-hidden="true"></i><span class="sr-only">Post</span> </a> <span class="responsive-hide">by <strong><a href="./memberlist.php?mode=viewprofile&u=480&sid=e01609816488d23b099037f20b431b3a" class="username">ernest</a></strong> » </span>Wed Jan 04, 2012 12:10 am </p> <div class="content"><blockquote><div><cite>induktio wrote:</cite>Crafty seems to think 15.Nxd4 is inferior to Ra2, </div></blockquote> Nolot himself thinks that after 15.Ra2, Position 6 is a draw</div> </div> </div> <div class="back2top"> <a href="#top" class="top" title="Top"> <i class="icon fa-chevron-circle-up fa-fw icon-gray" aria-hidden="true"></i> <span class="sr-only">Top</span> </a> </div> </div> </div> <hr class="divider" /> <div id="p15496" class="post has-profile bg1"> <div class="inner"> <dl class="postprofile" id="profile15496"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=148&sid=e01609816488d23b099037f20b431b3a" class="username">zullil</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=148&sr=posts&sid=e01609816488d23b099037f20b431b3a">82</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Thu Jun 10, 2010 10:17 am</dd> <dd class="profile-custom-field profile-realname"><strong>Real Name:</strong> Louis Zulli</dd> <dd class="profile-custom-field profile-phpbb_location"><strong>Location:</strong> Pennsylvania, USA</dd> </dl> <div class="postbody"> <div id="post_content15496"> <h3 ><a href="#p15496">Re: Revisiting Nolot Problems</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=15496&sid=e01609816488d23b099037f20b431b3a" title="Reply with quote" class="button button-icon-only"> <i class="icon fa-quote-left fa-fw" aria-hidden="true"></i><span class="sr-only">Quote</span> </a> </li> </ul> <p class="author"> <a class="unread" href="./viewtopic.php?p=15496&sid=e01609816488d23b099037f20b431b3a#p15496" title="Post"> <i class="icon fa-file fa-fw icon-lightgray icon-md" aria-hidden="true"></i><span class="sr-only">Post</span> </a> <span class="responsive-hide">by <strong><a href="./memberlist.php?mode=viewprofile&u=148&sid=e01609816488d23b099037f20b431b3a" class="username">zullil</a></strong> » </span>Wed Jan 04, 2012 2:41 am </p> <div class="content"><blockquote><div><cite>zullil wrote:</cite><blockquote><div><cite>induktio wrote:</cite> 30-> 3311:28 1.10 1. ... axb5 2. Qxa8 Bd4 3. Ra2 Qc7<br> 4. Kd1 O-O 5. cxb5 Nf2+ 6. Rxf2 Bxf2<br> 7. Qa4 cxb4 8. Qxb4 Bg4 9. Bd3 Nd7<br> 10. h3 Nc5 11. Be2 Bxf3 12. Bxf3 Bd4<br> 13. Rf1 Nd3 14. Qb1 Rc8 15. Bd2 Nb2+<br> 16. Ke1 Qc4 17. Bg4 (s=6)<br> [/code]<br> Crafty seems to think 15.Nxd4 is inferior to Ra2, and 16.Qxb8 is a slight mistake. That is, after 14...Bd4 Crafty seems to prefer entirely different lines than those on the wiki page. Any other engines agree? Be2 Bxf3 12</div></blockquote> Is that correct? You ran Crafty for 55 hours? <img class="smilies" src="./images/smilies/icon_eek.gif" width="15" height="17" alt=":shock:" title="Shocked"> <br> <br> Here's what Critter-1.4 (8 threads) gives after about 1 hour:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>23/67 59:31 32583304138 9124195 +0.00 axb5 Qxa8 Qc7 Rb1 Bd4 bxc5 Bxc5 Rxb5 Nd7 Qa4 O-O Qc2 f5 exf5 e4 Ng5 Rxf5 Ke1 Ndf6 Be2 Bf2+ Kd1 Bd4 Nh3 Ne3+ Bxe3 Bxe3 g4 Re5 Qb3 Rxd5+ Rxd5 Nxd5 Nf2 Qc5 Nxe4 Qd4+ Qd3 Qa1+ Kc2 Qa2+ Kd1 Qa1+ </code></pre></div> I'll let the search continue for a while.</div></blockquote> Here's more:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>26/67 224:36 126243364307 9367607 +0.00 axb5 Qxa8 Qc7 Rb1 Bd4 bxc5 Bxc5 Rxb5 Nd7 Qa4 O-O Qc2 f5 h3 Nf2 Rxc5 Nxc5 Kxf2 fxe4 Be3 b6 Be2 exf3 gxf3 e4 f4 Rxf4+ Bxf4 Qxf4+ Kg2 e3 Rf1 Qg5+ Kh2 Qe5+ Kg2 Qg5+</code></pre></div></div> </div> </div> <div class="back2top"> <a href="#top" class="top" title="Top"> <i class="icon fa-chevron-circle-up fa-fw icon-gray" aria-hidden="true"></i> <span class="sr-only">Top</span> </a> </div> </div> </div> <hr class="divider" /> <div id="p15500" class="post has-profile bg2"> <div class="inner"> <dl class="postprofile" id="profile15500"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=1719&sid=e01609816488d23b099037f20b431b3a" class="username">induktio</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=1719&sr=posts&sid=e01609816488d23b099037f20b431b3a">4</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Mon Jan 02, 2012 5:40 am</dd> </dl> <div class="postbody"> <div id="post_content15500"> <h3 ><a href="#p15500">Re: Revisiting Nolot Problems</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=15500&sid=e01609816488d23b099037f20b431b3a" title="Reply with quote" class="button button-icon-only"> <i class="icon fa-quote-left fa-fw" aria-hidden="true"></i><span class="sr-only">Quote</span> </a> </li> </ul> <p class="author"> <a class="unread" href="./viewtopic.php?p=15500&sid=e01609816488d23b099037f20b431b3a#p15500" title="Post"> <i class="icon fa-file fa-fw icon-lightgray icon-md" aria-hidden="true"></i><span class="sr-only">Post</span> </a> <span class="responsive-hide">by <strong><a href="./memberlist.php?mode=viewprofile&u=1719&sid=e01609816488d23b099037f20b431b3a" class="username">induktio</a></strong> » </span>Wed Jan 04, 2012 6:42 am </p> <div class="content"><blockquote><div><cite>zullil wrote:</cite>Is that correct? You ran Crafty for 55 hours? <img class="smilies" src="./images/smilies/icon_eek.gif" width="15" height="17" alt=":shock:" title="Shocked"> <br> <br> Here's what Critter-1.4 (8 threads) gives after about 1 hour:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>23/67 59:31 32583304138 9124195 +0.00 axb5 Qxa8 Qc7 Rb1 Bd4 bxc5 Bxc5 Rxb5 Nd7 Qa4 O-O Qc2 f5 exf5 e4 Ng5 Rxf5 Ke1 Ndf6 Be2 Bf2+ Kd1 Bd4 Nh3 Ne3+ Bxe3 Bxe3 g4 Re5 Qb3 Rxd5+ Rxd5 Nxd5 Nf2 Qc5 Nxe4 Qd4+ Qd3 Qa1+ Kc2 Qa2+ Kd1 Qa1+ </code></pre></div> I'll let the search continue for a while.</div></blockquote> Yeah, it's correct Crafty ran that long. A little crazy, I know. <img class="smilies" src="./images/smilies/icon_cool.gif" width="15" height="17" alt="8-)" title="Cool"><br> <br> Since your analysis indicates it's a draw, it's not just 15. 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