Mate in 15 (Difficult for most programs)

[biscuit1953]

2N5/8/8/p3PP2/2P1P3/p5B1/P2KP1pP/5krb b - - 1 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><br> Chessmaster 11 can only find <strong class="text-strong"><span style="text-decoration:underline">mate in 20</span></strong> after 30 minutes on my Acer Aspire laptop.</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="p17008" class="post has-profile bg1"> <div class="inner"> <dl class="postprofile" id="profile17008"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=148&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=148&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">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_content17008"> <h3 ><a href="#p17008">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17008&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17008&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17008" 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=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a></strong> » </span>Sat May 19, 2012 8:13 pm </p> <div class="content">Since Black can only play a4, let's just consider this position:<br> <br> <script type="text/javascript"> var pgn4webTextareaIdNum; if (pgn4webTextareaIdNum == undefined) { pgn4webTextareaIdNum = 1; } pgn4webTextareaId = "pgn4web_" + pgn4webTextareaIdNum++; document.write("<textarea id='" + pgn4webTextareaId +"' style='display: none;'>"); </script>2N5/8/8/4PP2/p1P1P3/p5B1/P2KP1pP/5krb w - - 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><br> <br> Critter-1.4 (8 threads, 4 GB hash) solves quickly:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>29/60 00:26 158858134 6066760 +M15 Bf4 Kf2 Be3+ Kf1 Kd3 Ke1 Bxg1 Kf1 Be3 g1=Q Bxg1 Bg2 e6 Bh3 e7 Kxg1 e8=Q Kg2 Qh5 Kxh2 Ke3 Kg3 Qf3+ Kh4 Kf4 Bxf5 Qg3+ Kh5 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="p17009" class="post has-profile bg2"> <div class="inner"> <dl class="postprofile" id="profile17009"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=1781&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">biscuit1953</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=1781&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">29</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Sun Apr 29, 2012 5:54 pm</dd> </dl> <div class="postbody"> <div id="post_content17009"> <h3 ><a href="#p17009">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17009&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17009&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17009" 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=1781&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">biscuit1953</a></strong> » </span>Sat May 19, 2012 8:24 pm </p> <div class="content">I must admit that I have had little experience with UCI programs and never used Critter before but, it certainly seems to be among the strongest.</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="p17010" class="post has-profile bg1"> <div class="inner"> <dl class="postprofile" id="profile17010"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=148&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=148&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">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_content17010"> <h3 ><a href="#p17010">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17010&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17010&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17010" 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=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a></strong> » </span>Sat May 19, 2012 8:33 pm </p> <div class="content"><blockquote><div><cite>biscuit1953 wrote:</cite>I must admit that I have had little experience with UCI programs and never used Critter before but, it certainly seems to be among the strongest.</div></blockquote> I don't use Houdini, but it might be faster on this one. Perhaps others will post their results soon.</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="p17012" class="post has-profile bg2"> <div class="inner"> <dl class="postprofile" id="profile17012"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=1781&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">biscuit1953</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=1781&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">29</a></dd> <dd class="profile-joined"><strong>Joined:</strong> Sun Apr 29, 2012 5:54 pm</dd> </dl> <div class="postbody"> <div id="post_content17012"> <h3 ><a href="#p17012">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17012&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17012&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17012" 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=1781&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">biscuit1953</a></strong> » </span>Sat May 19, 2012 10:58 pm </p> <div class="content">I'm starting to think that Critter is the <strong class="text-strong"><span style="text-decoration:underline">only</span></strong> program that can find mate in 15. Several engines I tested have failed to find it in including Rybka 2.2.</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="p17016" class="post has-profile bg1"> <div class="inner"> <dl class="postprofile" id="profile17016"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=148&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=148&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">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_content17016"> <h3 ><a href="#p17016">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17016&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17016&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17016" 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=f6e8d23cd5371983c9d94a99aab97fc6" class="username">zullil</a></strong> » </span>Sun May 20, 2012 3:02 am </p> <div class="content"><blockquote><div><cite>biscuit1953 wrote:</cite>I'm starting to think that Critter is the <strong class="text-strong"><span style="text-decoration:underline">only</span></strong> program that can find mate in 15. Several engines I tested have failed to find it in including Rybka 2.2.</div></blockquote> Stockfish-2.2.2 (8 threads, 2GB hash) finds mate-in-15, but not quickly:<br> <div class="codebox"><p>Code: <a href="#" onclick="selectCode(this); return false;">Select all</a></p><pre><code>info depth 34 seldepth 50 score mate 15 nodes 139722721779 nps 11740061 time 11901362 multipv 1 pv g3f4 f1f2 f4e3 f2f1 d2d3 f1e1 e3g1 e1f1 g1c5 g2g1r c5g1 f1g1 e5e6 h1e4 d3e4 g1f2 e6e7 f2e2 e7e8q e2d2 e4d4 d2c2 e8e1 c2b2 e1d1</code></pre></div> I'm confident that other engines will solve this too.</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="p17023" class="post has-profile bg2"> <div class="inner"> <dl class="postprofile" id="profile17023"> <dt class="no-profile-rank no-avatar"> <div class="avatar-container"> </div> <a href="./memberlist.php?mode=viewprofile&u=480&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="username">ernest</a> </dt> <dd class="profile-posts"><strong>Posts:</strong> <a href="./search.php?author_id=480&sr=posts&sid=f6e8d23cd5371983c9d94a99aab97fc6">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_content17023"> <h3 ><a href="#p17023">Re: Mate in 15 (Difficult for most programs)</a></h3> <ul class="post-buttons"> <li> <a href="./posting.php?mode=quote&f=3&p=17023&sid=f6e8d23cd5371983c9d94a99aab97fc6" 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=17023&sid=f6e8d23cd5371983c9d94a99aab97fc6#p17023" 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=f6e8d23cd5371983c9d94a99aab97fc6" class="username">ernest</a></strong> » </span>Sun May 20, 2012 6:38 pm </p> <div class="content"><blockquote><div><cite>zullil wrote:</cite>Since Black can only play a4, let's just consider this position:</div></blockquote> Houdini 2.0c finds it quite fast (on old dualcore):<br> <br> <span style="font-size:85%;line-height:116%">2N5/8/8/4PP2/p1P1P3/p5B1/P2KP1pP/5krb w - - 0 1<br> <br> Analysis by Houdini 2.0c w32 Nlm:<br> ........<br> 1.Bf4 Kf2 2.Be3+ Kf1 3.Kd3 Ke1 4.Bxg1 Kf1 5.Be3 g1Q 6.Bxg1 Bg2 7.Be3 Ke1 8.e6 Bf1 9.e7 Bxe2+ 10.Kd4 Bh5 11.f6 Kd1 12.Nd6 Kc2 13.f7 Kb2 14.f8Q Ka1 15.Qf1+ Kxa2 16.Kd3 Bg4 17.Qf2+ Be2+ 18.Qxe2+ Ka1 19.Bd4+ Kb1 20.Qc2# <br> +- (#20) Depth: 29/58 00:00:07 29451kN<br> 1.Bf4 Kf2 2.Be3+ Kf1 3.Kd3 Ke1 4.Bxg1 Kf1 5.Be3 g1Q 6.Bxg1 Bg2 7.Be3 Bh3 8.e6 Bg4 9.e7 Bh5 10.f6 Ke1 11.Nd6 Bxe2+ 12.Kd4 Bh5 13.f7 Bxf7 14.Nxf7 Kf1 15.e8Q Ke2 16.Qg8 Kf3 17.Qg3+ Ke2 18.Qf2+ Kd1 19.Qd2# <br> +- (#19) Depth: 30/58 00:00:11 47677kN<br> 1.Bf4 Kf2 2.Be3+ Kf1 3.Kd3 Ke1 4.Bxg1 Kf1 5.Be3 g1Q 6.Bxg1 Bg2 7.e6 Kxg1 8.e7 Kf2 9.e8Q Ke1 10.Qe5 Kf2 11.Qg3+ Kf1 12.Ke3 Kg1 13.f6 Kh1 14.Kf2 Bxe4 15.Qg1# <br> +- (#15) Depth: 31/58 00:00:18 82438kN</span></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 class="action-bar bar-bottom"> <a href="./posting.php?mode=reply&f=3&t=1971&sid=f6e8d23cd5371983c9d94a99aab97fc6" class="button" title="Post a reply"> <span>Post Reply</span> <i class="icon fa-reply fa-fw" aria-hidden="true"></i> </a> <div class="dropdown-container dropdown-button-control topic-tools"> <span title="Topic tools" class="button button-secondary dropdown-trigger dropdown-select"> <i 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