X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=remoteglot.pl;h=7f4fd3c2ddc58d03fff0b0a276236572cfffe993;hp=76163703bcf033921780c2496c550169511ef863;hb=01a8eaa3db2c015b25c0cf53df96b12493f3db58;hpb=1eb8400865727a17fdfa2d6b30e86aa570862d6c

diff --git a/remoteglot.pl b/remoteglot.pl
index 7616370..7f4fd3c 100755
--- a/remoteglot.pl
+++ b/remoteglot.pl
@@ -5,7 +5,7 @@
 #              analysis, or for live analysis of relayed games. (Do not use for
 #              cheating! Cheating is bad for your karma, and your abuser flag.)
 #
-# Copyright 2007 Steinar H. Gunderson <sgunderson@bigfoot.com>
+# Copyright 2007 Steinar H. Gunderson <steinar+remoteglot@gunderson.no>
 # Licensed under the GNU General Public License, version 2.
 #
 
@@ -15,11 +15,13 @@ use AnyEvent::HTTP;
 use Chess::PGN::Parse;
 use EV;
 use Net::Telnet;
-use FileHandle;
+use File::Slurp;
 use IPC::Open2;
 use Time::HiRes;
 use JSON::XS;
 use URI::Escape;
+use DBI;
+use DBD::Pg;
 require 'Position.pm';
 require 'Engine.pm';
 require 'config.pm';
@@ -28,12 +30,21 @@ use warnings;
 no warnings qw(once);
 
 # Program starts here
-$SIG{ALRM} = sub { output(); };
 my $latest_update = undef;
+my $output_timer = undef;
 my $http_timer = undef;
+my $stop_pgn_fetch = 0;
 my $tb_retry_timer = undef;
 my %tb_cache = ();
 my $tb_lookup_running = 0;
+my $last_written_json = undef;
+
+# Persisted so we can restart.
+# TODO: Figure out an appropriate way to deal with database restarts
+# and/or Postgres going away entirely.
+my $dbh = DBI->connect($remoteglotconf::dbistr, $remoteglotconf::dbiuser, $remoteglotconf::dbipass)
+	or die DBI->errstr;
+$dbh->{RaiseError} = 1;
 
 $| = 1;
 
@@ -56,13 +67,14 @@ select(TBLOG);
 $| = 1;
 
 select(STDOUT);
+umask 0022;  # analysis.json should not be served to users.
 
 # open the chess engine
 my $engine = open_engine($remoteglotconf::engine_cmdline, 'E1', sub { handle_uci(@_, 1); });
 my $engine2 = open_engine($remoteglotconf::engine2_cmdline, 'E2', sub { handle_uci(@_, 0); });
 my $last_move;
 my $last_text = '';
-my ($pos_waiting, $pos_calculating, $pos_calculating_second_engine);
+my ($pos_calculating, $pos_calculating_second_engine);
 
 uciprint($engine, "setoption name UCI_AnalyseMode value true");
 while (my ($key, $value) = each %remoteglotconf::engine_config) {
@@ -82,34 +94,46 @@ if (defined($engine2)) {
 print "Chess engine ready.\n";
 
 # now talk to FICS
-my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
-$t->input_log(\*FICSLOG);
-$t->open($remoteglotconf::server);
-$t->print($remoteglotconf::nick);
-$t->waitfor('/Press return to enter the server/');
-$t->cmd("");
-
-# set some options
-$t->cmd("set shout 0");
-$t->cmd("set seek 0");
-$t->cmd("set style 12");
-$t->cmd("observe $remoteglotconf::target");
-print "FICS ready.\n";
-
-my $ev1 = AnyEvent->io(
-	fh => fileno($t),
-	poll => 'r',
-	cb => sub {    # what callback to execute
-		while (1) {
-			my $line = $t->getline(Timeout => 0, errmode => 'return');
-			return if (!defined($line));
-
-			chomp $line;
-			$line =~ tr/\r//d;
-			handle_fics($line);
-		}
-	}
-);
+my ($t, $ev1);
+if (defined($remoteglotconf::server)) {
+	$t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
+	$t->input_log(\*FICSLOG);
+	$t->open($remoteglotconf::server);
+	$t->print($remoteglotconf::nick);
+	$t->waitfor('/Press return to enter the server/');
+	$t->cmd("");
+
+	# set some options
+	$t->cmd("set shout 0");
+	$t->cmd("set seek 0");
+	$t->cmd("set style 12");
+
+	$ev1 = AnyEvent->io(
+		fh => fileno($t),
+		poll => 'r',
+		cb => sub {    # what callback to execute
+			while (1) {
+				my $line = $t->getline(Timeout => 0, errmode => 'return');
+				return if (!defined($line));
+
+				chomp $line;
+				$line =~ tr/\r//d;
+				handle_fics($line);
+			}
+		}
+	);
+}
+if (defined($remoteglotconf::target)) {
+	if ($remoteglotconf::target =~ /^https?:/) {
+		fetch_pgn($remoteglotconf::target);
+	} elsif (defined($t)) {
+		$t->cmd("observe $remoteglotconf::target");
+	}
+}
+if (defined($t)) {
+	print "FICS ready.\n";
+}
+
 # Engine events have already been set up by Engine.pm.
 EV::run;
 
@@ -120,6 +144,11 @@ sub handle_uci {
 
 	$line =~ s/  / /g;  # Sometimes needed for Zappa Mexico
 	print UCILOG localtime() . " $engine->{'tag'} <= $line\n";
+
+	# If we've sent a stop command, gobble up lines until we see bestmove.
+	return if ($engine->{'stopping'} && $line !~ /^bestmove/);
+	$engine->{'stopping'} = 0;
+
 	if ($line =~ /^info/) {
 		my (@infos) = split / /, $line;
 		shift @infos;
@@ -132,31 +161,60 @@ sub handle_uci {
 
 		parse_ids($engine, @ids);
 	}
-	if ($line =~ /^bestmove/) {
-		if ($primary) {
-			return if (!$remoteglotconf::uci_assume_full_compliance);
-			if (defined($pos_waiting)) {
-				uciprint($engine, "position fen " . $pos_waiting->fen());
-				uciprint($engine, "go infinite");
-
-				$pos_calculating = $pos_waiting;
-				$pos_waiting = undef;
-			}
-		} else {
-			$engine2->{'info'} = {};
-			my $pos = $pos_waiting // $pos_calculating;
-			uciprint($engine2, "position fen " . $pos->fen());
-			uciprint($engine2, "go infinite");
-			$pos_calculating_second_engine = $pos;
-		}
-	}
 	output();
 }
 
+my $getting_movelist = 0;
+my $pos_for_movelist = undef;
+my @uci_movelist = ();
+my @pretty_movelist = ();
+
 sub handle_fics {
 	my $line = shift;
 	if ($line =~ /^<12> /) {
 		handle_position(Position->new($line));
+		$t->cmd("moves");
+	}
+	if ($line =~ /^Movelist for game /) {
+		my $pos = $pos_calculating;
+		if (defined($pos)) {
+			@uci_movelist = ();
+			@pretty_movelist = ();
+			$pos_for_movelist = Position->start_pos($pos->{'player_w'}, $pos->{'player_b'});
+			$getting_movelist = 1;
+		}
+	}
+	if ($getting_movelist &&
+	    $line =~ /^\s* \d+\. \s+                     # move number
+                       (\S+) \s+ \( [\d:.]+ \) \s*       # first move, then time
+	               (?: (\S+) \s+ \( [\d:.]+ \) )?    # second move, then time 
+	             /x) {
+		eval {
+			my $uci_move;
+			($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($1);
+			push @uci_movelist, $uci_move;
+			push @pretty_movelist, $1;
+
+			if (defined($2)) {
+				($pos_for_movelist, $uci_move) = $pos_for_movelist->make_pretty_move($2);
+				push @uci_movelist, $uci_move;
+				push @pretty_movelist, $2;
+			}
+		};
+		if ($@) {
+			warn "Error when getting FICS move history: $@";
+			$getting_movelist = 0;
+		}
+	}
+	if ($getting_movelist &&
+	    $line =~ /^\s+ \{.*\} \s+ (?: \* | 1\/2-1\/2 | 0-1 | 1-0 )/x) {
+		# End of movelist.
+		if (defined($pos_calculating)) {
+			if ($pos_calculating->fen() eq $pos_for_movelist->fen()) {
+				$pos_calculating->{'history'} = \@pretty_movelist;
+			}
+		}
+		$getting_movelist = 0;
 	}
 	if ($line =~ /^([A-Za-z]+)(?:\([A-Z]+\))* tells you: (.*)$/) {
 		my ($who, $msg) = ($1, $2);
@@ -172,11 +230,10 @@ sub handle_fics {
 		} elsif ($msg =~ /^pgn (.*?)$/) {
 			my $url = $1;
 			$t->cmd("tell $who Starting to poll '$url'.");
-			AnyEvent::HTTP::http_get($url, sub {
-				handle_pgn(@_, $url);
-			});
+			fetch_pgn($url);
 		} elsif ($msg =~ /^stoppgn$/) {
 			$t->cmd("tell $who Stopping poll.");
+			$stop_pgn_fetch = 1;
 			$http_timer = undef;
 		} elsif ($msg =~ /^quit$/) {
 			$t->cmd("tell $who Bye bye.");
@@ -188,74 +245,159 @@ sub handle_fics {
 	#print "FICS: [$line]\n";
 }
 
+# Starts periodic fetching of PGNs from the given URL.
+sub fetch_pgn {
+	my ($url) = @_;
+	AnyEvent::HTTP::http_get($url, sub {
+		handle_pgn(@_, $url);
+	});
+}
+
+my ($last_pgn_white, $last_pgn_black);
+my @last_pgn_uci_moves = ();
+my $pgn_hysteresis_counter = 0;
+
 sub handle_pgn {
 	my ($body, $header, $url) = @_;
+
+	if ($stop_pgn_fetch) {
+		$stop_pgn_fetch = 0;
+		$http_timer = undef;
+		return;
+	}
+
 	my $pgn = Chess::PGN::Parse->new(undef, $body);
-	if (!defined($pgn) || !$pgn->read_game()) {
-		warn "Error in parsing PGN from $url\n";
+	if (!defined($pgn)) {
+		warn "Error in parsing PGN from $url [body='$body']\n";
+	} elsif (!$pgn->read_game()) {
+		warn "Error in reading PGN game from $url [body='$body']\n";
+	} elsif ($body !~ /^\[/) {
+		warn "Malformed PGN from $url [body='$body']\n";
 	} else {
-		$pgn->quick_parse_game;
-		my $pos = Position->start_pos($pgn->white, $pgn->black);
-		my $moves = $pgn->moves;
-		my @uci_moves = ();
-		for my $move (@$moves) {
-			my ($from_row, $from_col, $to_row, $to_col, $promo) = $pos->parse_pretty_move($move);
-			push @uci_moves, Board::move_to_uci_notation($from_row, $from_col, $to_row, $to_col, $promo);
-			$pos = $pos->make_move($from_row, $from_col, $to_row, $to_col, $promo);
-		}
-		$pos->{'history'} = \@uci_moves;
-		$pos->{'pretty_history'} = $moves;
-		handle_position($pos);
+		eval {
+			# Skip to the right game.
+			while (defined($remoteglotconf::pgn_filter) &&
+			       !&$remoteglotconf::pgn_filter($pgn)) {
+				$pgn->read_game() or die "Out of games during filtering";
+			}
+
+			$pgn->parse_game({ save_comments => 'yes' });
+			my $white = $pgn->white;
+			my $black = $pgn->black;
+			$white =~ s/,.*//;  # Remove first name.
+			$black =~ s/,.*//;  # Remove first name.
+			my $tags = $pgn->tags();
+			my $pos;
+			if (exists($tags->{'FEN'})) {
+				$pos = Position->from_fen($tags->{'FEN'});
+				$pos->{'player_w'} = $white;
+				$pos->{'player_b'} = $black;
+				$pos->{'start_fen'} = $tags->{'FEN'};
+			} else {
+				$pos = Position->start_pos($white, $black);
+			}
+			my $moves = $pgn->moves;
+			my @uci_moves = ();
+			my @repretty_moves = ();
+			for my $move (@$moves) {
+				my ($npos, $uci_move) = $pos->make_pretty_move($move);
+				push @uci_moves, $uci_move;
+
+				# Re-prettyprint the move.
+				my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($uci_move);
+				my ($pretty, undef) = $pos->{'board'}->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
+				push @repretty_moves, $pretty;
+				$pos = $npos;
+			}
+			if ($pgn->result eq '1-0' || $pgn->result eq '1/2-1/2' || $pgn->result eq '0-1') {
+				$pos->{'result'} = $pgn->result;
+			}
+			$pos->{'history'} = \@repretty_moves;
+
+			extract_clock($pgn, $pos);
+
+			# Sometimes, PGNs lose a move or two for a short while,
+			# or people push out new ones non-atomically. 
+			# Thus, if we PGN doesn't change names but becomes
+			# shorter, we mistrust it for a few seconds.
+			my $trust_pgn = 1;
+			if (defined($last_pgn_white) && defined($last_pgn_black) &&
+			    $last_pgn_white eq $pgn->white &&
+			    $last_pgn_black eq $pgn->black &&
+			    scalar(@uci_moves) < scalar(@last_pgn_uci_moves)) {
+				if (++$pgn_hysteresis_counter < 3) {
+					$trust_pgn = 0;	
+				}
+			}
+			if ($trust_pgn) {
+				$last_pgn_white = $pgn->white;
+				$last_pgn_black = $pgn->black;
+				@last_pgn_uci_moves = @uci_moves;
+				$pgn_hysteresis_counter = 0;
+				handle_position($pos);
+			}
+		};
+		if ($@) {
+			warn "Error in parsing moves from $url: $@\n";
+		}
 	}
 	
 	$http_timer = AnyEvent->timer(after => 1.0, cb => sub {
-		AnyEvent::HTTP::http_get($url, sub {
-			handle_pgn(@_, $url);
-		});
+		fetch_pgn($url);
 	});
 }
 
 sub handle_position {
 	my ($pos) = @_;
+	find_clock_start($pos, $pos_calculating);
 		
-	# if this is already in the queue, ignore it
-	return if (defined($pos_waiting) && $pos->fen() eq $pos_waiting->fen());
-
-	# if we're already chewing on this and there's nothing else in the queue,
-	# also ignore it
-	return if (!defined($pos_waiting) && defined($pos_calculating) &&
-		 $pos->fen() eq $pos_calculating->fen());
+	# If we're already chewing on this and there's nothing else in the queue,
+	# ignore it.
+	if (defined($pos_calculating) && $pos->fen() eq $pos_calculating->fen()) {
+		$pos_calculating->{'result'} = $pos->{'result'};
+		for my $key ('white_clock', 'black_clock', 'white_clock_target', 'black_clock_target') {
+			$pos_calculating->{$key} //= $pos->{$key};
+		}
+		return;
+	}
 
-	# if we're already thinking on something, stop and wait for the engine
-	# to approve
+	# If we're already thinking on something, stop and wait for the engine
+	# to approve.
 	if (defined($pos_calculating)) {
-		if (!defined($pos_waiting)) {
-			uciprint($engine, "stop");
-		}
-		if ($remoteglotconf::uci_assume_full_compliance) {
-			$pos_waiting = $pos;
-		} else {
-			uciprint($engine, "position fen " . $pos->fen());
-			uciprint($engine, "go infinite");
-			$pos_calculating = $pos;
-		}
-	} else {
-		# it's wrong just to give the FEN (the move history is useful,
-		# and per the UCI spec, we should really have sent "ucinewgame"),
-		# but it's easier
-		uciprint($engine, "position fen " . $pos->fen());
-		uciprint($engine, "go infinite");
-		$pos_calculating = $pos;
+		# Store the final data we have for this position in the history,
+		# with the precise clock information we just got from the new
+		# position. (Historic positions store the clock at the end of
+		# the position.)
+		#
+		# Do not output anything new to the main analysis; that's
+		# going to be obsolete really soon.
+		$pos_calculating->{'white_clock'} = $pos->{'white_clock'};
+		$pos_calculating->{'black_clock'} = $pos->{'black_clock'};
+		delete $pos_calculating->{'white_clock_target'};
+		delete $pos_calculating->{'black_clock_target'};
+		output_json(1);
+
+		# Ask the engine to stop; we will throw away its data until it
+		# sends us "bestmove", signaling the end of it.
+		$engine->{'stopping'} = 1;
+		uciprint($engine, "stop");
 	}
 
+	# It's wrong to just give the FEN (the move history is useful,
+	# and per the UCI spec, we should really have sent "ucinewgame"),
+	# but it's easier, and it works around a Stockfish repetition issue.
+	uciprint($engine, "position fen " . $pos->fen());
+	uciprint($engine, "go infinite");
+	$pos_calculating = $pos;
+
 	if (defined($engine2)) {
 		if (defined($pos_calculating_second_engine)) {
+			$engine2->{'stopping'} = 1;
 			uciprint($engine2, "stop");
-		} else {
-			uciprint($engine2, "position fen " . $pos->fen());
-			uciprint($engine2, "go infinite");
-			$pos_calculating_second_engine = $pos;
 		}
+		uciprint($engine2, "position fen " . $pos->fen());
+		uciprint($engine2, "go infinite");
+		$pos_calculating_second_engine = $pos;
 		$engine2->{'info'} = {};
 	}
 
@@ -271,7 +413,9 @@ sub handle_position {
 	# hour, the analysis/relay has most likely stopped
 	# and we should stop hogging server resources.
 	#
-	$t->cmd("date");
+	if (defined($t)) {
+		$t->cmd("date");
+	}
 }
 
 sub parse_infos {
@@ -347,10 +491,9 @@ sub parse_ids {
 	my ($engine, @x) = @_;
 
 	while (scalar @x > 0) {
-		if ($x[0] =~ /^(name|author)$/) {
-			my $key = shift @x;
+		if ($x[0] eq 'name') {
 			my $value = join(' ', @x);
-			$engine->{'id'}{$key} = $value;
+			$engine->{'id'}{'author'} = $value;
 			last;
 		}
 
@@ -367,7 +510,7 @@ sub prettyprint_pv_no_cache {
 	}
 
 	my $pv = shift @pvs;
-	my ($from_col, $from_row, $to_col, $to_row, $promo) = parse_uci_move($pv);
+	my ($from_row, $from_col, $to_row, $to_col, $promo) = parse_uci_move($pv);
 	my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
 	return ( $pretty, prettyprint_pv_no_cache($nb, @pvs) );
 }
@@ -385,6 +528,73 @@ sub prettyprint_pv {
 	}
 }
 
+my %tbprobe_cache = ();
+
+sub complete_using_tbprobe {
+	my ($pos, $info, $mpv) = @_;
+
+	# We need Fathom installed to do standalone TB probes.
+	return if (!defined($remoteglotconf::fathom_cmdline));
+
+	# If we already have a mate, don't bother; in some cases, it would even be
+	# better than a tablebase score.
+	return if defined($info->{'score_mate' . $mpv});
+
+	# If we have a draw or near-draw score, there's also not much interesting
+	# we could add from a tablebase. We only really want mates.
+	return if ($info->{'score_cp' . $mpv} >= -12250 && $info->{'score_cp' . $mpv} <= 12250);
+
+	# Run through the PV until we are at a 6-man position.
+	# TODO: We could in theory only have 5-man data.
+	my @pv = @{$info->{'pv' . $mpv}};
+	my $key = $pos->fen() . " " . join('', @pv);
+	my @moves = ();
+	if (exists($tbprobe_cache{$key})) {
+		@moves = @{$tbprobe_cache{$key}};
+	} else {
+		if ($mpv ne '') {
+			# Force doing at least one move of the PV.
+			my $move = shift @pv;
+			push @moves, $move;
+			$pos = $pos->make_move(parse_uci_move($move));
+		}
+
+		while ($pos->num_pieces() > 6 && $#pv > -1) {
+			my $move = shift @pv;
+			push @moves, $move;
+			$pos = $pos->make_move(parse_uci_move($move));
+		}
+
+		return if ($pos->num_pieces() > 6);
+
+		my $fen = $pos->fen();
+		my $pgn_text = `fathom --path=/srv/syzygy "$fen"`;
+		my $pgn = Chess::PGN::Parse->new(undef, $pgn_text);
+		return if (!defined($pgn) || !$pgn->read_game() || ($pgn->result ne '0-1' && $pgn->result ne '1-0'));
+		$pgn->quick_parse_game;
+		$info->{'pv' . $mpv} = \@moves;
+
+		# Splice the PV from the tablebase onto what we have so far.
+		for my $move (@{$pgn->moves}) {
+			last if $move eq '#';
+			my $uci_move;
+			($pos, $uci_move) = $pos->make_pretty_move($move);
+			push @moves, $uci_move;
+		}
+
+		$tbprobe_cache{$key} = \@moves;
+	}
+
+	$info->{'pv' . $mpv} = \@moves;
+
+	my $matelen = int((1 + scalar @moves) / 2);
+	if ((scalar @moves) % 2 == 0) {
+		$info->{'score_mate' . $mpv} = -$matelen;
+	} else {
+		$info->{'score_mate' . $mpv} = $matelen;
+	}
+}
+
 sub output {
 	#return;
 
@@ -393,7 +603,8 @@ sub output {
 	# Don't update too often.
 	my $age = Time::HiRes::tv_interval($latest_update);
 	if ($age < $remoteglotconf::update_max_interval) {
-		Time::HiRes::alarm($remoteglotconf::update_max_interval + 0.01 - $age);
+		my $wait = $remoteglotconf::update_max_interval + 0.01 - $age;
+		$output_timer = AnyEvent->timer(after => $wait, cb => \&output);
 		return;
 	}
 	
@@ -417,7 +628,7 @@ sub output {
 
 		my $t = $tb_cache{$fen};
 		my $pv = $t->{'pv'};
-		my $matelen = int((1 + scalar @$pv) / 2);
+		my $matelen = int((1 + $t->{'score'}) / 2);
 		if ($t->{'result'} eq '1/2-1/2') {
 			$info->{'score_cp'} = 0;
 		} elsif ($t->{'result'} eq '1-0') {
@@ -448,6 +659,8 @@ sub output {
 		for my $key (qw(pv score_cp score_mate nodes nps depth seldepth tbhits)) {
 			if (exists($info->{$key . '1'})) {
 				$info->{$key} = $info->{$key . '1'};
+			} else {
+				delete $info->{$key};
 			}
 		}
 	}
@@ -474,8 +687,19 @@ sub output {
 		return;
 	}
 
+	# Now do our own Syzygy tablebase probes to convert scores like +123.45 to mate.
+	if (exists($info->{'pv'})) {
+		complete_using_tbprobe($pos_calculating, $info, '');
+	}
+
+	my $mpv = 1;
+	while (exists($info->{'pv' . $mpv})) {
+		complete_using_tbprobe($pos_calculating, $info, $mpv);
+		++$mpv;
+	}
+
 	output_screen();
-	output_json();
+	output_json(0);
 	$latest_update = [Time::HiRes::gettimeofday];
 }
 
@@ -562,8 +786,8 @@ sub output_screen {
 			my $info = $engine2->{'info'};
 			last if (!exists($info->{'pv' . $mpv}));
 			eval {
+				complete_using_tbprobe($pos_calculating_second_engine, $info, $mpv);
 				my $pv = $info->{'pv' . $mpv};
-
 				my $pretty_move = join('', prettyprint_pv($pos_calculating_second_engine, $pv->[0]));
 				my @pretty_pv = prettyprint_pv($pos_calculating_second_engine, @$pv);
 				if (scalar @pretty_pv > 5) {
@@ -597,13 +821,34 @@ sub output_screen {
 }
 
 sub output_json {
+	my $historic_json_only = shift;
 	my $info = $engine->{'info'};
 
 	my $json = {};
 	$json->{'position'} = $pos_calculating->to_json_hash();
-	$json->{'id'} = $engine->{'id'};
-	$json->{'score'} = long_score($info, $pos_calculating, '');
-	$json->{'short_score'} = short_score($info, $pos_calculating, '');
+	$json->{'engine'} = $engine->{'id'};
+	if (defined($remoteglotconf::engine_url)) {
+		$json->{'engine'}{'url'} = $remoteglotconf::engine_url;
+	}
+	if (defined($remoteglotconf::engine_details)) {
+		$json->{'engine'}{'details'} = $remoteglotconf::engine_details;
+	}
+	my @grpc_backends = ();
+	if (defined($remoteglotconf::engine_grpc_backend)) {
+		push @grpc_backends, $remoteglotconf::engine_grpc_backend;
+	}
+	if (defined($remoteglotconf::engine2_grpc_backend)) {
+		push @grpc_backends, $remoteglotconf::engine2_grpc_backend;
+	}
+	$json->{'internal'}{'grpc_backends'} = \@grpc_backends;
+	if (defined($remoteglotconf::move_source)) {
+		$json->{'move_source'} = $remoteglotconf::move_source;
+	}
+	if (defined($remoteglotconf::move_source_url)) {
+		$json->{'move_source_url'} = $remoteglotconf::move_source_url;
+	}
+	$json->{'score'} = score_digest($info, $pos_calculating, '');
+	$json->{'using_lomonosov'} = defined($remoteglotconf::tb_serial_key);
 
 	$json->{'nodes'} = $info->{'nodes'};
 	$json->{'nps'} = $info->{'nps'};
@@ -611,10 +856,7 @@ sub output_json {
 	$json->{'tbhits'} = $info->{'tbhits'};
 	$json->{'seldepth'} = $info->{'seldepth'};
 	$json->{'tablebase'} = $info->{'tablebase'};
-
-	# single-PV only for now
-	$json->{'pv_uci'} = $info->{'pv'};
-	$json->{'pv_pretty'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
+	$json->{'pv'} = [ prettyprint_pv($pos_calculating, @{$info->{'pv'}}) ];
 
 	my %refutation_lines = ();
 	my @refutation_lines = ();
@@ -626,28 +868,178 @@ sub output_json {
 			last if (!exists($info->{'pv' . $mpv}));
 
 			eval {
+				complete_using_tbprobe($pos_calculating, $info, $mpv);
 				my $pv = $info->{'pv' . $mpv};
 				my $pretty_move = join('', prettyprint_pv($pos_calculating, $pv->[0]));
 				my @pretty_pv = prettyprint_pv($pos_calculating, @$pv);
-				$refutation_lines{$pv->[0]} = {
-					sort_key => $pretty_move,
+				$refutation_lines{$pretty_move} = {
 					depth => $info->{'depth' . $mpv},
-					score_sort_key => score_sort_key($info, $pos_calculating, $mpv, 0),
-					pretty_score => short_score($info, $pos_calculating, $mpv),
-					pretty_move => $pretty_move,
-					pv_pretty => \@pretty_pv,
+					score => score_digest($info, $pos_calculating, $mpv),
+					move => $pretty_move,
+					pv => \@pretty_pv,
 				};
-				$refutation_lines{$pv->[0]}->{'pv_uci'} = $pv;
 			};
 		}
 	}
 	$json->{'refutation_lines'} = \%refutation_lines;
 
-	open my $fh, ">", $remoteglotconf::json_output . ".tmp"
+	# Piece together historic score information, to the degree we have it.
+	if (!$historic_json_only && exists($pos_calculating->{'history'})) {
+		my %score_history = ();
+
+		local $dbh->{AutoCommit} = 0;
+		my $q = $dbh->prepare('SELECT * FROM scores WHERE id=?');
+		my $pos;
+		if (exists($pos_calculating->{'start_fen'})) {
+			$pos = Position->from_fen($pos_calculating->{'start_fen'});
+		} else {
+			$pos = Position->start_pos('white', 'black');
+		}
+		my $halfmove_num = 0;
+		for my $move (@{$pos_calculating->{'history'}}) {
+			my $id = id_for_pos($pos, $halfmove_num);
+			my $ref = $dbh->selectrow_hashref($q, undef, $id);
+			if (defined($ref)) {
+				$score_history{$halfmove_num} = [
+					$ref->{'score_type'},
+					$ref->{'score_value'}
+				];
+			}
+			++$halfmove_num;
+			($pos) = $pos->make_pretty_move($move);
+		}
+		$q->finish;
+		$dbh->commit;
+
+		# If at any point we are missing 10 consecutive moves,
+		# truncate the history there. This is so we don't get into
+		# a situation where we e.g. start analyzing at move 45,
+		# but we have analysis for 1. e4 from some completely different game
+		# and thus show a huge hole.
+		my $consecutive_missing = 0;
+		my $truncate_until = 0;
+		for (my $i = $halfmove_num; $i --> 0; ) {
+			if ($consecutive_missing >= 10) {
+				delete $score_history{$i};
+				next;
+			}
+			if (exists($score_history{$i})) {
+				$consecutive_missing = 0;
+			} else {
+				++$consecutive_missing;
+			}
+		}
+
+		$json->{'score_history'} = \%score_history;
+	}
+
+	# Give out a list of other games going on. (Empty is fine.)
+	# TODO: Don't bother reading our own file, the data will be stale anyway.
+	if (!$historic_json_only) {
+		my @games = ();
+
+		my $q = $dbh->prepare('SELECT * FROM current_games ORDER BY priority DESC, id');
+		$q->execute;
+		while (my $ref = $q->fetchrow_hashref) {
+			eval {
+				my $other_game_contents = File::Slurp::read_file($ref->{'json_path'});
+				my $other_game_json = JSON::XS::decode_json($other_game_contents);
+
+				die "Missing position" if (!exists($other_game_json->{'position'}));
+				my $white = $other_game_json->{'position'}{'player_w'} // die 'Missing white';
+				my $black = $other_game_json->{'position'}{'player_b'} // die 'Missing black';
+
+				my $game = {
+					id => $ref->{'id'},
+					name => "$white–$black",
+					url => $ref->{'url'},
+					hashurl => $ref->{'hash_url'},
+				};
+				if (defined($other_game_json->{'position'}{'result'})) {
+					$game->{'result'} = $other_game_json->{'position'}{'result'};
+				} else {
+					$game->{'score'} = $other_game_json->{'score'};
+				}
+				push @games, $game;
+			};
+			if ($@) {
+				warn "Could not add external game " . $ref->{'json_path'} . ": $@";
+			}
+		}
+
+		if (scalar @games > 0) {
+			$json->{'games'} = \@games;
+		}
+	}
+
+	my $json_enc = JSON::XS->new;
+	$json_enc->canonical(1);
+	my $encoded = $json_enc->encode($json);
+	unless ($historic_json_only || !defined($remoteglotconf::json_output) ||
+	        (defined($last_written_json) && $last_written_json eq $encoded)) {
+		atomic_set_contents($remoteglotconf::json_output, $encoded);
+		$last_written_json = $encoded;
+	}
+
+	if (exists($pos_calculating->{'history'}) &&
+	    defined($remoteglotconf::json_history_dir)) {
+		my $id = id_for_pos($pos_calculating);
+		my $filename = $remoteglotconf::json_history_dir . "/" . $id . ".json";
+
+		# Overwrite old analysis (assuming it exists at all) if we're
+		# using a different engine, or if we've calculated deeper.
+		# nodes is used as a tiebreaker. Don't bother about Multi-PV
+		# data; it's not that important.
+		my ($old_engine, $old_depth, $old_nodes) = get_json_analysis_stats($id);
+		my $new_depth = $json->{'depth'} // 0;
+		my $new_nodes = $json->{'nodes'} // 0;
+		if (!defined($old_engine) ||
+		    $old_engine ne $json->{'engine'}{'name'} ||
+		    $new_depth > $old_depth ||
+		    ($new_depth == $old_depth && $new_nodes >= $old_nodes)) {
+			atomic_set_contents($filename, $encoded);
+			if (defined($json->{'score'})) {
+				$dbh->do('INSERT INTO scores (id, score_type, score_value, engine, depth, nodes) VALUES (?,?,?,?,?,?) ' .
+				         '    ON CONFLICT (id) DO UPDATE SET ' .
+				         '        score_type=EXCLUDED.score_type, ' .
+					 '        score_value=EXCLUDED.score_value, ' .
+					 '        engine=EXCLUDED.engine, ' .
+					 '        depth=EXCLUDED.depth, ' .
+					 '        nodes=EXCLUDED.nodes',
+					undef,
+					$id, $json->{'score'}[0], $json->{'score'}[1],
+					$json->{'engine'}{'name'}, $new_depth, $new_nodes);
+			}
+		}
+	}
+}
+
+sub atomic_set_contents {
+	my ($filename, $contents) = @_;
+
+	open my $fh, ">", $filename . ".tmp"
 		or return;
-	print $fh JSON::XS::encode_json($json);
+	print $fh $contents;
 	close $fh;
-	rename($remoteglotconf::json_output . ".tmp", $remoteglotconf::json_output);
+	rename($filename . ".tmp", $filename);
+}
+
+sub id_for_pos {
+	my ($pos, $halfmove_num) = @_;
+
+	$halfmove_num //= scalar @{$pos->{'history'}};
+	(my $fen = $pos->fen()) =~ tr,/ ,-_,;
+	return "move$halfmove_num-$fen";
+}
+
+sub get_json_analysis_stats {
+	my $id = shift;
+	my $ref = $dbh->selectrow_hashref('SELECT * FROM scores WHERE id=?', undef, $id);
+	if (defined($ref)) {
+		return ($ref->{'engine'}, $ref->{'depth'}, $ref->{'nodes'});
+	} else {
+		return ('', 0, 0);
+	}
 }
 
 sub uciprint {
@@ -686,30 +1078,28 @@ sub short_score {
 	return undef;
 }
 
-sub score_sort_key {
-	my ($info, $pos, $mpv, $invert) = @_;
+# Sufficient for computing long_score, short_score, plot_score and
+# (with side-to-play information) score_sort_key.
+sub score_digest {
+	my ($info, $pos, $mpv) = @_;
 
 	if (defined($info->{'score_mate' . $mpv})) {
 		my $mate = $info->{'score_mate' . $mpv};
-		my $score;
-		if ($mate > 0) {
-			# Side to move mates
-			$mate = 99999 - $mate;
-		} else {
-			# Side to move is getting mated (note the double negative for $mate)
-			$mate = -99999 - $mate;
-		}
-		if ($invert) {
-			$score = -$score;
+		if ($pos->{'toplay'} eq 'B') {
+			$mate = -$mate;
 		}
-		return $score;
+		return ['m', $mate];
 	} else {
 		if (exists($info->{'score_cp' . $mpv})) {
 			my $score = $info->{'score_cp' . $mpv};
-			if ($invert) {
+			if ($pos->{'toplay'} eq 'B') {
 				$score = -$score;
 			}
-			return $score;
+			if ($score == 0 && $info->{'tablebase'}) {
+				return ['d', undef];
+			} else {
+				return ['cp', int($score)];
+			}
 		}
 	}
 
@@ -749,6 +1139,36 @@ sub long_score {
 	return undef;
 }
 
+# For graphs; a single number in centipawns, capped at +/- 500.
+sub plot_score {
+	my ($info, $pos, $mpv) = @_;
+
+	my $invert = ($pos->{'toplay'} eq 'B');
+	if (defined($info->{'score_mate' . $mpv})) {
+		my $mate = $info->{'score_mate' . $mpv};
+		if ($invert) {
+			$mate = -$mate;
+		}
+		if ($mate > 0) {
+			return 500;
+		} else {
+			return -500;
+		}
+	} else {
+		if (exists($info->{'score_cp' . $mpv})) {
+			my $score = $info->{'score_cp' . $mpv};
+			if ($invert) {
+				$score = -$score;
+			}
+			$score = 500 if ($score > 500);
+			$score = -500 if ($score < -500);
+			return int($score);
+		}
+	}
+
+	return undef;
+}
+
 my %book_cache = ();
 sub book_info {
 	my ($fen, $board, $toplay) = @_;
@@ -801,9 +1221,127 @@ sub book_info {
 	return $text;
 }
 
+sub extract_clock {
+	my ($pgn, $pos) = @_;
+
+	# Look for extended PGN clock tags.
+	my $tags = $pgn->tags;
+	if (exists($tags->{'WhiteClock'}) && exists($tags->{'BlackClock'})) {
+		$pos->{'white_clock'} = hms_to_sec($tags->{'WhiteClock'});
+		$pos->{'black_clock'} = hms_to_sec($tags->{'BlackClock'});
+		return;
+	}
+
+	# Look for TCEC-style time comments.
+	my $moves = $pgn->moves;
+	my $comments = $pgn->comments;
+	my $last_black_move = int((scalar @$moves) / 2);
+	my $last_white_move = int((1 + scalar @$moves) / 2);
+
+	my $black_key = $last_black_move . "b";
+	my $white_key = $last_white_move . "w";
+
+	if (exists($comments->{$white_key}) &&
+	    exists($comments->{$black_key}) &&
+	    $comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/ &&
+	    $comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/) {
+		$comments->{$white_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
+		$pos->{'white_clock'} = hms_to_sec($1);
+		$comments->{$black_key} =~ /(?:tl=|clk )(\d+:\d+:\d+)/;
+		$pos->{'black_clock'} = hms_to_sec($1);
+		return;
+	}
+
+	delete $pos->{'white_clock'};
+	delete $pos->{'black_clock'};
+}
+
+sub hms_to_sec {
+	my $hms = shift;
+	return undef if (!defined($hms));
+	$hms =~ /(\d+):(\d+):(\d+)/;
+	return $1 * 3600 + $2 * 60 + $3;
+}
+
+sub find_clock_start {
+	my ($pos, $prev_pos) = @_;
+
+	# If the game is over, the clock is stopped.
+	if (exists($pos->{'result'}) &&
+	    ($pos->{'result'} eq '1-0' ||
+	     $pos->{'result'} eq '1/2-1/2' ||
+	     $pos->{'result'} eq '0-1')) {
+		return;
+	}
+
+	# When we don't have any moves, we assume the clock hasn't started yet.
+	if ($pos->{'move_num'} == 1 && $pos->{'toplay'} eq 'W') {
+		if (defined($remoteglotconf::adjust_clocks_before_move)) {
+			&$remoteglotconf::adjust_clocks_before_move(\$pos->{'white_clock'}, \$pos->{'black_clock'}, 1, 'W');
+		}
+		return;
+	}
+
+	# TODO(sesse): Maybe we can get the number of moves somehow else for FICS games.
+	# The history is needed for id_for_pos.
+	if (!exists($pos->{'history'})) {
+		return;
+	}
+
+	my $id = id_for_pos($pos);
+	my $clock_info = $dbh->selectrow_hashref('SELECT * FROM clock_info WHERE id=? AND COALESCE(white_clock_target, black_clock_target) >= EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP - INTERVAL \'1 day\'));', undef, $id);
+	if (defined($clock_info)) {
+		$pos->{'white_clock'} //= $clock_info->{'white_clock'};
+		$pos->{'black_clock'} //= $clock_info->{'black_clock'};
+		if ($pos->{'toplay'} eq 'W') {
+			$pos->{'white_clock_target'} = $clock_info->{'white_clock_target'};
+		} else {
+			$pos->{'black_clock_target'} = $clock_info->{'black_clock_target'};
+		}
+		return;
+	}
+
+	# OK, we haven't seen this position before, so we assume the move
+	# happened right now.
+
+	# See if we should do our own clock management (ie., clock information
+	# is spurious or non-existent).
+	if (defined($remoteglotconf::adjust_clocks_before_move)) {
+		my $wc = $pos->{'white_clock'} // $prev_pos->{'white_clock'};
+		my $bc = $pos->{'black_clock'} // $prev_pos->{'black_clock'};
+		if (defined($prev_pos->{'white_clock_target'})) {
+			$wc = $prev_pos->{'white_clock_target'} - time;
+		}
+		if (defined($prev_pos->{'black_clock_target'})) {
+			$bc = $prev_pos->{'black_clock_target'} - time;
+		}
+		&$remoteglotconf::adjust_clocks_before_move(\$wc, \$bc, $pos->{'move_num'}, $pos->{'toplay'});
+		$pos->{'white_clock'} = $wc;
+		$pos->{'black_clock'} = $bc;
+	}
+
+	my $key = ($pos->{'toplay'} eq 'W') ? 'white_clock' : 'black_clock';
+	if (!exists($pos->{$key})) {
+		# No clock information.
+		return;
+	}
+	my $time_left = $pos->{$key};
+	my ($white_clock_target, $black_clock_target);
+	if ($pos->{'toplay'} eq 'W') {
+		$white_clock_target = $pos->{'white_clock_target'} = time + $time_left;
+	} else {
+		$black_clock_target = $pos->{'black_clock_target'} = time + $time_left;
+	}
+	local $dbh->{AutoCommit} = 0;
+	$dbh->do('DELETE FROM clock_info WHERE id=?', undef, $id);
+	$dbh->do('INSERT INTO clock_info (id, white_clock, black_clock, white_clock_target, black_clock_target) VALUES (?, ?, ?, ?, ?)', undef,
+		$id, $pos->{'white_clock'}, $pos->{'black_clock'}, $white_clock_target, $black_clock_target);
+	$dbh->commit;
+}
+
 sub schedule_tb_lookup {
 	return if (!defined($remoteglotconf::tb_serial_key));
-	my $pos = $pos_waiting // $pos_calculating;
+	my $pos = $pos_calculating;
 	return if (exists($tb_cache{$pos->fen()}));
 
 	# If there's more than seven pieces, there's not going to be an answer,
@@ -815,7 +1353,7 @@ sub schedule_tb_lookup {
 	return if ($tb_lookup_running);
 
 	$tb_lookup_running = 1;
-	my $url = 'http://158.250.18.203:6904/tasks/addtask?auth.login=' .
+	my $url = 'http://tb7-api.chessok.com:6904/tasks/addtask?auth.login=' .
 		$remoteglotconf::tb_serial_key .
 		'&auth.password=aquarium&type=0&fen=' . 
 		URI::Escape::uri_escape($pos->fen());
@@ -846,13 +1384,14 @@ sub handle_tb_lookup_return {
 				my $moves = $pgn->moves;
 				my @uci_moves = ();
 				for my $move (@$moves) {
-					my ($from_row, $from_col, $to_row, $to_col, $promo) = $pvpos->parse_pretty_move($move);
-					push @uci_moves, Board::move_to_uci_notation($from_row, $from_col, $to_row, $to_col, $promo);
-					$pvpos = $pvpos->make_move($from_row, $from_col, $to_row, $to_col, $promo);
+					my $uci_move;
+					($pvpos, $uci_move) = $pvpos->make_pretty_move($move);
+					push @uci_moves, $uci_move;
 				}
 				$tb_cache{$fen} = {
 					result => $pgn->result,
-					pv => \@uci_moves
+					pv => \@uci_moves,
+					score => $response->{'Response'}{'Score'},
 				};
 				output();
 			}
@@ -861,7 +1400,7 @@ sub handle_tb_lookup_return {
 			# position in the meantime, we might query a completely
 			# different position! But that's fine.
 		} else {
-			die "Unknown response state state " . $response->{'Response'}{'StateString'};
+			die "Unknown response state " . $state;
 		}
 
 		# Wait a second before we schedule another one.
@@ -899,5 +1438,5 @@ sub parse_uci_move {
 	my $to_col   = col_letter_to_num(substr($move, 2, 1));
 	my $to_row   = row_letter_to_num(substr($move, 3, 1));
 	my $promo    = substr($move, 4, 1);
-	return ($from_col, $from_row, $to_col, $to_row, $promo);
+	return ($from_row, $from_col, $to_row, $to_col, $promo);
 }