15 my ($chld_out, $chld_in);
16 my $pid = IPC::Open2::open2($chld_out, $chld_in, "../binlookup", "../open.mtbl", "40");
18 # Root position. Basically ignore everything except the opening (and later some root game stuff).
19 my $fen = $cgi->param('fen') // 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
20 my $prevfen = $cgi->param('prevfen') // '';
21 my $includetransp = $cgi->param('includetransp') // 1;
23 my $pos = Position->from_fen($fen);
24 my ($json_root_pos, $root_aux_data);
26 ($json_root_pos, $root_aux_data) = get_json_move($pos, undef, $chld_in, $chld_out);
28 my $prev_pos_hash = 0;
30 my $prevpos = Position->from_fen($prevfen);
31 my (undef, $prev_aux_data) = get_json_move($prevpos, undef, $chld_in, $chld_out);
32 $prev_pos_hash = $prev_aux_data->{'pos_hash'};
34 ($json_root_pos, $root_aux_data) = get_json_move($pos, $prev_pos_hash, $chld_in, $chld_out);
37 my $opening = $openings{$json_root_pos->{'opening_num'}} // 'A00: Start position';
38 my @json_moves = ($json_root_pos);
42 if (!exists($root_aux_data->{'pgn_file_number'}) ||
43 !exists($root_aux_data->{'pgn_start_position'})) {
44 die "Missing PGN position data."
46 my $pgntext = read_root_pgn($root_aux_data->{'pgn_file_number'}, $root_aux_data->{'pgn_start_position'});
47 my $pgn = Chess::PGN::Parse->new(undef, $pgntext);
48 $pgn->read_game() or die;
49 $pgn->parse_game() or die;
51 my $tags = $pgn->tags;
53 $root_game->{'white'} = $pgn->white;
54 $root_game->{'white_elo'} = $tags->{'WhiteElo'};
55 $root_game->{'black'} = $pgn->black;
56 $root_game->{'black_elo'} = $tags->{'BlackElo'};
57 $root_game->{'event'} = $pgn->event;
58 $root_game->{'date'} = $pgn->date;
59 $root_game->{'result'} = $pgn->result;
60 $root_game->{'eco'} = $pgn->eco;
61 $root_game->{'moves'} = int(((scalar @{$pgn->moves}) + 1) / 2);
64 # Explore one move out.
65 for my $move (@{$root_aux_data->{'moves'}}) {
66 my ($np, $uci_move) = $pos->make_pretty_move($move);
69 ($json_pos, undef) = get_json_move($np, undef, $chld_in, $chld_out);
71 ($json_pos, undef) = get_json_move($np, $root_aux_data->{'pos_hash'}, $chld_in, $chld_out);
73 $json_pos->{'move'} = $move;
74 push @json_moves, $json_pos;
77 print $cgi->header(-type=>'application/json');
78 print JSON::XS::encode_json({ moves => \@json_moves, opening => $opening, root_game => $root_game });
81 open my $fh, "../openings.txt"
82 or die "../openings.txt: $!";
83 for my $line (<$fh>) {
85 my ($hash, $eco, $opening, $variation, $subvariation) = split /\t/, $line;
86 if ($variation eq '') {
87 $openings{$hash} = $eco . ": " . $opening;
89 $openings{$hash} = $eco . ": " . $opening . ": " . $variation;
96 my ($pgn_file_number, $pgn_start_position) = @_;
98 open my $pgnnamesfh, "<", "../pgnnames.txt"
99 or die "../pgnnames.txt: $!";
100 while (<$pgnnamesfh>) {
106 if ($pgn_file_number > $#pgnnames) {
107 die "Unknown PGN file number $pgn_file_number";
111 open my $pgnfh, "<", "../" . $pgnnames[$pgn_file_number]
112 or die $pgnnames[$pgn_file_number] . ": $!";
113 sysseek($pgnfh, $pgn_start_position, 0)
114 or die "Could not seek to $pgn_start_position: $!";
115 sysread($pgnfh, $root_pgn, 32768)
116 or die "Could not read PGN from $pgn_start_position at $pgnnames[$pgn_file_number]: $!";
118 $root_pgn =~ s/^.*?(\[Event )/$1/s;
119 $root_pgn =~ s/^(.+?)\[Event .*/$1/s;
125 my ($pos, $filter_prev_pos_hash, $chld_in, $chld_out) = @_;
126 my $bpfen_hex = unpack('H*', $pos->bitpacked_fen);
127 my $prev_pos_hash_hex = '';
128 if (defined($filter_prev_pos_hash)) {
129 $prev_pos_hash_hex .= unpack('H*', pack('S', $filter_prev_pos_hash));
131 print $chld_in $bpfen_hex, "\n", $prev_pos_hash_hex, "\n";
133 # Read the hash of this position.
134 chomp (my $pos_hash = <$chld_out>);
136 chomp (my $line = <$chld_out>);
138 warn "Missing pos '" . $pos->fen . "' " . $filter_prev_pos_hash;
142 my ($white, $draw, $black, $opening_num, $white_sum_elo, $black_sum_elo, $num_elo, $timestamp, $pgn_file_number, $pgn_start_position, @moves) = split / /, $line;
147 white_avg_elo => $num_elo == 0 ? undef : $white_sum_elo / $num_elo,
148 black_avg_elo => $num_elo == 0 ? undef : $black_sum_elo / $num_elo,
150 opening_num => $opening_num,
152 my $aux_data = { # Only relevant for the root.
153 pos_hash => $pos_hash * 1,
155 pgn_file_number => $pgn_file_number,
156 pgn_start_position => $pgn_start_position,
158 return ($json_pos, $aux_data);