4 # remoteglot - Connects an abitrary UCI-speaking engine to ICS for easier post-game
5 # analysis, or for live analysis of relayed games. (Do not use for
6 # cheating! Cheating is bad for your karma, and your abuser flag.)
8 # Copyright 2007 Steinar H. Gunderson <sgunderson@bigfoot.com>
9 # Licensed under the GNU General Public License, version 2.
15 use Chess::PGN::Parse;
23 require 'Position.pm';
31 my $latest_update = undef;
32 my $output_timer = undef;
33 my $http_timer = undef;
34 my $stop_pgn_fetch = 0;
35 my $tb_retry_timer = undef;
37 my $tb_lookup_running = 0;
41 open(FICSLOG, ">ficslog.txt")
42 or die "ficslog.txt: $!";
43 print FICSLOG "Log starting.\n";
47 open(UCILOG, ">ucilog.txt")
48 or die "ucilog.txt: $!";
49 print UCILOG "Log starting.\n";
53 open(TBLOG, ">tblog.txt")
54 or die "tblog.txt: $!";
55 print TBLOG "Log starting.\n";
61 # open the chess engine
62 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
63 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
66 my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
68 uciprint($engine, "setoption name UCI_AnalyseMode value true");
69 while (my ($key, $value) = each %remoteglotconf::engine_config) {
70 uciprint($engine, "setoption name $key value $value");
72 uciprint($engine, "ucinewgame");
74 if (defined($engine2)) {
75 uciprint($engine2, "setoption name UCI_AnalyseMode value true");
76 while (my ($key, $value) = each %remoteglotconf::engine2_config) {
77 uciprint($engine2, "setoption name $key value $value");
79 uciprint($engine2, "setoption name MultiPV value 500");
80 uciprint($engine2, "ucinewgame");
83 print "Chess engine ready.\n";
86 my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
87 $t->input_log(\*FICSLOG);
88 $t->open($remoteglotconf::server);
89 $t->print($remoteglotconf::nick);
90 $t->waitfor('/Press return to enter the server/');
94 $t->cmd("set shout 0");
95 $t->cmd("set seek 0");
96 $t->cmd("set style 12");
98 my $ev1 = AnyEvent->io(
101 cb => sub { # what callback to execute
103 my $line = $t->getline(Timeout => 0, errmode => 'return');
104 return if (!defined($line));
112 if (defined($remoteglotconf::target)) {
113 if ($remoteglotconf::target =~ /^http:/) {
114 fetch_pgn($remoteglotconf::target);
116 $t->cmd("observe $remoteglotconf::target");
119 print "FICS ready.\n";
121 # Engine events have already been set up by Engine.pm.
125 my ($engine, $line, $primary) = @_;
127 return if $line =~ /(upper|lower)bound/;
129 $line =~ s/ / /g; # Sometimes needed for Zappa Mexico
130 print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
131 if ($line =~ /^info/) {
132 my (@infos) = split / /, $line;
135 parse_infos($engine, @infos);
137 if ($line =~ /^id/) {
138 my (@ids) = split / /, $line;
141 parse_ids($engine, @ids);
143 if ($line =~ /^bestmove/) {
145 return if (!$remoteglotconf::uci_assume_full_compliance);
146 if (defined($pos_waiting)) {
147 uciprint($engine, "position fen " . $pos_waiting->fen());
148 uciprint($engine, "go infinite");
150 $pos_calculating = $pos_waiting;
151 $pos_waiting = undef;
154 $engine2->{'info'} = {};
155 my $pos = $pos_waiting // $pos_calculating;
156 uciprint($engine2, "position fen " . $pos->fen());
157 uciprint($engine2, "go infinite");
158 $pos_calculating_second_engine = $pos;
164 my $getting_movelist = 0;
165 my $pos_for_movelist = undef;
166 my @uci_movelist = ();
167 my @pretty_movelist = ();
171 if ($line =~ /^<12> /) {
172 handle_position(Position->new($line));
175 if ($line =~ /^Movelist for game /) {
176 my $pos = $pos_waiting // $pos_calculating;
179 @pretty_movelist = ();
180 $pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
181 $getting_movelist = 1;
184 if ($getting_movelist &&
185 $line =~ /^\s* \d+\. \s+ # move number
186 (\S+) \s+ \( [\d:.]+ \) \s* # first move, then time
187 (?: (\S+) \s+ \( [\d:.]+ \) )? # second move, then time
191 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
192 push @uci_movelist, $uci_move;
193 push @pretty_movelist, $1;
196 ($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
197 push @uci_movelist, $uci_move;
198 push @pretty_movelist, $2;
202 warn "Error when getting FICS move history: $@";
203 $getting_movelist = 0;
206 if ($getting_movelist &&
207 $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
209 for my $pos ($pos_waiting, $pos_calculating) {
210 next if (!defined($pos));
211 if ($pos->fen() eq $pos_for_movelist->fen()) {
212 $pos->{'history'} = \@uci_movelist;
213 $pos->{'pretty_history'} = \@pretty_movelist;
216 $getting_movelist = 0;
218 if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
219 my ($who, $msg) = ($1, $2);
221 next if (grep { $_ eq $who } (@remoteglotconf::masters) == 0);
223 if ($msg =~ /^fics (.*?)$/) {
224 $t->cmd("tell $who Executing '$1' on FICS.");
226 } elsif ($msg =~ /^uci (.*?)$/) {
227 $t->cmd("tell $who Sending '$1' to the engine.");
228 print { $engine->{'write'} } "$1\n";
229 } elsif ($msg =~ /^pgn (.*?)$/) {
231 $t->cmd("tell $who Starting to poll '$url'.");
233 } elsif ($msg =~ /^stoppgn$/) {
234 $t->cmd("tell $who Stopping poll.");
237 } elsif ($msg =~ /^quit$/) {
238 $t->cmd("tell $who Bye bye.");
241 $t->cmd("tell $who Couldn't understand '$msg', sorry.");
244 #print "FICS: [$line]\n";
247 # Starts periodic fetching of PGNs from the given URL.
250 AnyEvent::HTTP::http_get($url, sub {
251 handle_pgn(@_, $url);
255 my ($last_pgn_white, $last_pgn_black);
256 my @last_pgn_uci_moves = ();
257 my $pgn_hysteresis_counter = 0;
260 my ($body, $header, $url) = @_;
262 if ($stop_pgn_fetch) {
268 my $pgn = Chess::PGN::Parse->new(undef, $body);
269 if (!defined($pgn) || !$pgn->read_game()) {
270 warn "Error in parsing PGN from $url\n";
272 $pgn->quick_parse_game;
273 my $pos = Position->start_pos($pgn->white, $pgn->black);
274 my $moves = $pgn->moves;
276 for my $move (@$moves) {
278 ($pos, $uci_move) = $pos->make_pretty_move($move);
279 push @uci_moves, $uci_move;
281 $pos->{'history'} = \@uci_moves;
282 $pos->{'pretty_history'} = $moves;
284 # Sometimes, PGNs lose a move or two for a short while,
285 # or people push out new ones non-atomically.
286 # Thus, if we PGN doesn't change names but becomes
287 # shorter, we mistrust it for a few seconds.
289 if (defined($last_pgn_white) && defined($last_pgn_black) &&
290 $last_pgn_white eq $pgn->white &&
291 $last_pgn_black eq $pgn->black &&
292 scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
293 if (++$pgn_hysteresis_counter < 3) {
298 $last_pgn_white = $pgn->white;
299 $last_pgn_black = $pgn->black;
300 @last_pgn_uci_moves = @uci_moves;
301 $pgn_hysteresis_counter = 0;
302 handle_position($pos);
306 $http_timer = AnyEvent->timer(after => 1.0, cb => sub {
311 sub handle_position {
314 # if this is already in the queue, ignore it
315 return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
317 # if we're already chewing on this and there's nothing else in the queue,
319 return if (!defined($pos_waiting) && defined($pos_calculating) &&
320 $pos->fen() eq $pos_calculating->fen());
322 # if we're already thinking on something, stop and wait for the engine
324 if (defined($pos_calculating)) {
325 if (!defined($pos_waiting)) {
326 uciprint($engine, "stop");
328 if ($remoteglotconf::uci_assume_full_compliance) {
331 uciprint($engine, "position fen " . $pos->fen());
332 uciprint($engine, "go infinite");
333 $pos_calculating = $pos;
336 # it's wrong just to give the FEN (the move history is useful,
337 # and per the UCI spec, we should really have sent "ucinewgame"),
339 uciprint($engine, "position fen " . $pos->fen());
340 uciprint($engine, "go infinite");
341 $pos_calculating = $pos;
344 if (defined($engine2)) {
345 if (defined($pos_calculating_second_engine)) {
346 uciprint($engine2, "stop");
348 uciprint($engine2, "position fen " . $pos->fen());
349 uciprint($engine2, "go infinite");
350 $pos_calculating_second_engine = $pos;
352 $engine2->{'info'} = {};
355 $engine->{'info'} = {};
358 schedule_tb_lookup();
361 # Output a command every move to note that we're
362 # still paying attention -- this is a good tradeoff,
363 # since if no move has happened in the last half
364 # hour, the analysis/relay has most likely stopped
365 # and we should stop hogging server resources.
371 my ($engine, @x) = @_;
374 my $info = $engine->{'info'};
376 # Search for "multipv" first of all, since e.g. Stockfish doesn't put it first.
377 for my $i (0..$#x - 1) {
378 if ($x[$i] eq 'multipv') {
384 while (scalar @x > 0) {
385 if ($x[0] eq 'multipv') {
391 if ($x[0] eq 'currmove' || $x[0] eq 'currmovenumber' || $x[0] eq 'cpuload') {
393 my $value = shift @x;
394 $info->{$key} = $value;
397 if ($x[0] eq 'depth' || $x[0] eq 'seldepth' || $x[0] eq 'hashfull' ||
398 $x[0] eq 'time' || $x[0] eq 'nodes' || $x[0] eq 'nps' ||
401 my $value = shift @x;
402 $info->{$key . $mpv} = $value;
405 if ($x[0] eq 'score') {
408 delete $info->{'score_cp' . $mpv};
409 delete $info->{'score_mate' . $mpv};
411 while ($x[0] eq 'cp' || $x[0] eq 'mate') {
414 $info->{'score_cp' . $mpv} = shift @x;
415 } elsif ($x[0] eq 'mate') {
417 $info->{'score_mate' . $mpv} = shift @x;
425 $info->{'pv' . $mpv} = [ @x[1..$#x] ];
428 if ($x[0] eq 'string' || $x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting' || $x[0] eq 'contempt') {
432 #print "unknown info '$x[0]', trying to recover...\n";
434 die "Unknown info '" . join(',', @x) . "'";
440 my ($engine, @x) = @_;
442 while (scalar @x > 0) {
443 if ($x[0] =~ /^(name|author)$/) {
445 my $value = join(' ', @x);
446 $engine->{'id'}{$key} = $value;
455 sub prettyprint_pv_no_cache {
456 my ($board, @pvs) = @_;
458 if (scalar @pvs == 0 || !defined($pvs[0])) {
463 my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
464 my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
465 return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
469 my ($pos, @pvs) = @_;
471 my $cachekey = join('', @pvs);
472 if (exists($pos->{'prettyprint_cache'}{$cachekey})) {
473 return @{$pos->{'prettyprint_cache'}{$cachekey}};
475 my @res = prettyprint_pv_no_cache($pos->{'board'}, @pvs);
476 $pos->{'prettyprint_cache'}{$cachekey} = \@res;
484 return if (!defined($pos_calculating));
486 # Don't update too often.
487 my $age = Time::HiRes::tv_interval($latest_update);
488 if ($age < $remoteglotconf::update_max_interval) {
489 my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
490 $output_timer = AnyEvent->timer(after => $wait, cb => \&output);
494 my $info = $engine->{'info'};
497 # If we have tablebase data from a previous lookup, replace the
498 # engine data with the data from the tablebase.
500 my $fen = $pos_calculating->fen();
501 if (exists($tb_cache{$fen})) {
502 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
503 delete $info->{$key . '1'};
504 delete $info->{$key};
506 $info->{'nodes'} = 0;
508 $info->{'depth'} = 0;
509 $info->{'seldepth'} = 0;
510 $info->{'tbhits'} = 0;
512 my $t = $tb_cache{$fen};
514 my $matelen = int((1 + scalar @$pv) / 2);
515 if ($t->{'result'} eq '1/2-1/2') {
516 $info->{'score_cp'} = 0;
517 } elsif ($t->{'result'} eq '1-0') {
518 if ($pos_calculating->{'toplay'} eq 'B') {
519 $info->{'score_mate'} = -$matelen;
521 $info->{'score_mate'} = $matelen;
524 if ($pos_calculating->{'toplay'} eq 'B') {
525 $info->{'score_mate'} = $matelen;
527 $info->{'score_mate'} = -$matelen;
531 $info->{'tablebase'} = 1;
533 $info->{'tablebase'} = 0;
537 # Some programs _always_ report MultiPV, even with only one PV.
538 # In this case, we simply use that data as if MultiPV was never
541 if (exists($info->{'pv1'}) && !exists($info->{'pv2'})) {
542 for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
543 if (exists($info->{$key . '1'})) {
544 $info->{$key} = $info->{$key . '1'};
550 # Check the PVs first. if they're invalid, just wait, as our data
551 # is most likely out of sync. This isn't a very good solution, as
552 # it can frequently miss stuff, but it's good enough for most users.
556 if (exists($info->{'pv'})) {
557 $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv'}});
561 while (exists($info->{'pv' . $mpv})) {
562 $dummy = prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}});
567 $engine->{'info'} = {};
573 $latest_update = [Time::HiRes::gettimeofday];
577 my $info = $engine->{'info'};
578 my $id = $engine->{'id'};
580 my $text = 'Analysis';
581 if ($pos_calculating->{'last_move'} ne 'none') {
582 if ($pos_calculating->{'toplay'} eq 'W') {
583 $text .= sprintf ' after %u. ... %s', ($pos_calculating->{'move_num'}-1), $pos_calculating->{'last_move'};
585 $text .= sprintf ' after %u. %s', $pos_calculating->{'move_num'}, $pos_calculating->{'last_move'};
587 if (exists($id->{'name'})) {
592 if (exists($id->{'name'})) {
593 $text .= " by $id->{'name'}:\n\n";
598 return unless (exists($pos_calculating->{'board'}));
600 if (exists($info->{'pv1'}) && exists($info->{'pv2'})) {
603 while (exists($info->{'pv' . $mpv})) {
604 $text .= sprintf " PV%2u", $mpv;
605 my $score = short_score($info, $pos_calculating, $mpv);
606 $text .= " ($score)" if (defined($score));
609 if (exists($info->{'tbhits' . $mpv}) && $info->{'tbhits' . $mpv} > 0) {
610 if ($info->{'tbhits' . $mpv} == 1) {
611 $tbhits = ", 1 tbhit";
613 $tbhits = sprintf ", %u tbhits", $info->{'tbhits' . $mpv};
617 if (exists($info->{'nodes' . $mpv}) && exists($info->{'nps' . $mpv}) && exists($info->{'depth' . $mpv})) {
618 $text .= sprintf " (%5u kn, %3u kn/s, %2u ply$tbhits)",
619 $info->{'nodes' . $mpv} / 1000, $info->{'nps' . $mpv} / 1000, $info->{'depth' . $mpv};
623 $text .= " " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv' . $mpv}})) . "\n";
629 my $score = long_score($info, $pos_calculating, '');
630 $text .= " $score\n" if defined($score);
631 $text .= " PV: " . join(', ', prettyprint_pv($pos_calculating, @{$info->{'pv'}}));
634 if (exists($info->{'nodes'}) && exists($info->{'nps'}) && exists($info->{'depth'})) {
635 $text .= sprintf " %u nodes, %7u nodes/sec, depth %u ply",
636 $info->{'nodes'}, $info->{'nps'}, $info->{'depth'};
638 if (exists($info->{'seldepth'})) {
639 $text .= sprintf " (%u selective)", $info->{'seldepth'};
641 if (exists($info->{'tbhits'}) && $info->{'tbhits'} > 0) {
642 if ($info->{'tbhits'} == 1) {
643 $text .= ", one Syzygy hit";
645 $text .= sprintf ", %u Syzygy hits", $info->{'tbhits'};
651 #$text .= book_info($pos_calculating->fen(), $pos_calculating->{'board'}, $pos_calculating->{'toplay'});
653 my @refutation_lines = ();
654 if (defined($engine2)) {
655 for (my $mpv = 1; $mpv < 500; ++$mpv) {
656 my $info = $engine2->{'info'};
657 last if (!exists($info->{'pv' . $mpv}));
659 my $pv = $info->{'pv' . $mpv};
661 my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
662 my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
663 if (scalar @pretty_pv > 5) {
664 @pretty_pv = @pretty_pv[0..4];
665 push @pretty_pv, "...";
667 my $key = $pretty_move;
668 my $line = sprintf(" %-6s %6s %3s %s",
670 short_score($info, $pos_calculating_second_engine, $mpv),
671 "d" . $info->{'depth' . $mpv},
672 join(', ', @pretty_pv));
673 push @refutation_lines, [ $key, $line ];
678 if ($#refutation_lines >= 0) {
679 $text .= "Shallow search of all legal moves:\n\n";
680 for my $line (sort { $a->[0] cmp $b->[0] } @refutation_lines) {
681 $text .= $line->[1] . "\n";
686 if ($last_text ne $text) {
687 print "
\e[H
\e[2J"; # clear the screen
694 my $info = $engine->{'info'};
697 $json->{'position'} = $pos_calculating->to_json_hash();
698 $json->{'id'} = $engine->{'id'};
699 $json->{'score'} = long_score($info, $pos_calculating, '');
700 $json->{'short_score'} = short_score($info, $pos_calculating, '');
702 $json->{'nodes'} = $info->{'nodes'};
703 $json->{'nps'} = $info->{'nps'};
704 $json->{'depth'} = $info->{'depth'};
705 $json->{'tbhits'} = $info->{'tbhits'};
706 $json->{'seldepth'} = $info->{'seldepth'};
707 $json->{'tablebase'} = $info->{'tablebase'};
709 # single-PV only for now
710 $json->{'pv_uci'} = $info->{'pv'};
711 $json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
713 my %refutation_lines = ();
714 my @refutation_lines = ();
715 if (defined($engine2)) {
716 for (my $mpv = 1; $mpv < 500; ++$mpv) {
717 my $info = $engine2->{'info'};
718 my $pretty_move = "";
720 last if (!exists($info->{'pv' . $mpv}));
723 my $pv = $info->{'pv' . $mpv};
724 my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
725 my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
726 $refutation_lines{$pv->[0]} = {
727 sort_key => $pretty_move,
728 depth => $info->{'depth' . $mpv},
729 score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
730 pretty_score => short_score($info, $pos_calculating, $mpv),
731 pretty_move => $pretty_move,
732 pv_pretty => \@pretty_pv,
734 $refutation_lines{$pv->[0]}->{'pv_uci'} = $pv;
738 $json->{'refutation_lines'} = \%refutation_lines;
740 open my $fh, ">", $remoteglotconf::json_output . ".tmp"
742 print $fh JSON::XS::encode_json($json);
744 rename($remoteglotconf::json_output . ".tmp", $remoteglotconf::json_output);
748 my ($engine, $msg) = @_;
749 $engine->print($msg);
750 print UCILOG localtime() . " $engine->{'tag'} => $msg\n";
754 my ($info, $pos, $mpv) = @_;
756 my $invert = ($pos->{'toplay'} eq 'B');
757 if (defined($info->{'score_mate' . $mpv})) {
759 return sprintf "M%3d", -$info->{'score_mate' . $mpv};
761 return sprintf "M%3d", $info->{'score_mate' . $mpv};
764 if (exists($info->{'score_cp' . $mpv})) {
765 my $score = $info->{'score_cp' . $mpv} * 0.01;
767 if ($info->{'tablebase'}) {
776 return sprintf "%+5.2f", $score;
784 my ($info, $pos, $mpv, $invert) = @_;
786 if (defined($info->{'score_mate' . $mpv})) {
787 my $mate = $info->{'score_mate' . $mpv};
791 $score = 99999 - $mate;
793 # Side to move is getting mated (note the double negative for $mate)
794 $score = -99999 - $mate;
801 if (exists($info->{'score_cp' . $mpv})) {
802 my $score = $info->{'score_cp' . $mpv};
814 my ($info, $pos, $mpv) = @_;
816 if (defined($info->{'score_mate' . $mpv})) {
817 my $mate = $info->{'score_mate' . $mpv};
818 if ($pos->{'toplay'} eq 'B') {
822 return sprintf "White mates in %u", $mate;
824 return sprintf "Black mates in %u", -$mate;
827 if (exists($info->{'score_cp' . $mpv})) {
828 my $score = $info->{'score_cp' . $mpv} * 0.01;
830 if ($info->{'tablebase'}) {
831 return "Theoretical draw";
833 return "Score: 0.00";
836 if ($pos->{'toplay'} eq 'B') {
839 return sprintf "Score: %+5.2f", $score;
848 my ($fen, $board, $toplay) = @_;
850 if (exists($book_cache{$fen})) {
851 return $book_cache{$fen};
854 my $ret = `./booklook $fen`;
855 return "" if ($ret =~ /Not found/ || $ret eq '');
859 for my $m (split /\n/, $ret) {
860 my ($move, $annotation, $win, $draw, $lose, $rating, $rating_div) = split /,/, $m;
864 $pmove = '(current)';
866 ($pmove) = prettyprint_pv_no_cache($board, $move);
867 $pmove .= $annotation;
871 if ($toplay eq 'W') {
872 $score = 1.0 * $win + 0.5 * $draw + 0.0 * $lose;
874 $score = 0.0 * $win + 0.5 * $draw + 1.0 * $lose;
876 my $n = $win + $draw + $lose;
882 $percent = sprintf "%4u%%", int(100.0 * $score / $n + 0.5);
885 push @moves, [ $pmove, $n, $percent, $rating ];
888 @moves[1..$#moves] = sort { $b->[2] cmp $a->[2] } @moves[1..$#moves];
890 my $text = "Book moves:\n\n Perf. N Rating\n\n";
892 $text .= sprintf " %-10s %s %6u %4s\n", $m->[0], $m->[2], $m->[1], $m->[3]
898 sub schedule_tb_lookup {
899 return if (!defined($remoteglotconf::tb_serial_key));
900 my $pos = $pos_waiting // $pos_calculating;
901 return if (exists($tb_cache{$pos->fen()}));
903 # If there's more than seven pieces, there's not going to be an answer,
905 return if ($pos->num_pieces() > 7);
907 # Max one at a time. If it's still relevant when it returns,
908 # schedule_tb_lookup() will be called again.
909 return if ($tb_lookup_running);
911 $tb_lookup_running = 1;
912 my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
913 $remoteglotconf::tb_serial_key .
914 '&auth.password=aquarium&type=0&fen=' .
915 URI::Escape::uri_escape($pos->fen());
916 print TBLOG "Downloading $url...\n";
917 AnyEvent::HTTP::http_get($url, sub {
918 handle_tb_lookup_return(@_, $pos, $pos->fen());
922 sub handle_tb_lookup_return {
923 my ($body, $header, $pos, $fen) = @_;
924 print TBLOG "Response for [$fen]:\n";
925 print TBLOG $header . "\n\n";
926 print TBLOG $body . "\n\n";
928 my $response = JSON::XS::decode_json($body);
929 if ($response->{'ErrorCode'} != 0) {
930 die "Unknown tablebase server error: " . $response->{'ErrorDesc'};
932 my $state = $response->{'Response'}{'StateString'};
933 if ($state eq 'COMPLETE') {
934 my $pgn = Chess::PGN::Parse->new(undef, $response->{'Response'}{'Moves'});
935 if (!defined($pgn) || !$pgn->read_game()) {
936 warn "Error in parsing PGN\n";
938 $pgn->quick_parse_game;
940 my $moves = $pgn->moves;
942 for my $move (@$moves) {
944 ($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
945 push @uci_moves, $uci_move;
948 result => $pgn->result,
953 } elsif ($state =~ /QUEUED/ || $state =~ /PROCESSING/) {
954 # Try again in a second. Note that if we have changed
955 # position in the meantime, we might query a completely
956 # different position! But that's fine.
958 die "Unknown response state " . $state;
961 # Wait a second before we schedule another one.
962 $tb_retry_timer = AnyEvent->timer(after => 1.0, cb => sub {
963 $tb_lookup_running = 0;
964 schedule_tb_lookup();
968 warn "Error in tablebase lookup: $@";
970 # Don't try this one again, but don't block new lookups either.
971 $tb_lookup_running = 0;
976 my ($cmdline, $tag, $cb) = @_;
977 return undef if (!defined($cmdline));
978 return Engine->open($cmdline, $tag, $cb);
981 sub col_letter_to_num {
982 return ord(shift) - ord('a');
985 sub row_letter_to_num {
986 return 7 - (ord(shift) - ord('1'));
991 my $from_col = col_letter_to_num(substr($move, 0, 1));
992 my $from_row = row_letter_to_num(substr($move, 1, 1));
993 my $to_col = col_letter_to_num(substr($move, 2, 1));
994 my $to_row = row_letter_to_num(substr($move, 3, 1));
995 my $promo = substr($move, 4, 1);
996 return ($from_col, $from_row, $to_col, $to_row, $promo);