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 $includetransp = $cgi->param('includetransp') // 1;
22 my $pos = Position->from_fen($fen);
23 my ($json_root_pos, $root_aux_data) = get_json_move($pos, undef, $chld_in, $chld_out);
25 my $opening = $openings{$json_root_pos->{'opening_num'}} // 'A00: Start position';
26 my @json_moves = ($json_root_pos);
30 if (!exists($root_aux_data->{'pgn_file_number'}) ||
31 !exists($root_aux_data->{'pgn_start_position'})) {
32 die "Missing PGN position data."
34 my $pgntext = read_root_pgn($root_aux_data->{'pgn_file_number'}, $root_aux_data->{'pgn_start_position'});
35 my $pgn = Chess::PGN::Parse->new(undef, $pgntext);
36 $pgn->read_game() or die;
37 $pgn->parse_game() or die;
39 my $tags = $pgn->tags;
41 $root_game->{'white'} = $pgn->white;
42 $root_game->{'white_elo'} = $tags->{'WhiteElo'};
43 $root_game->{'black'} = $pgn->black;
44 $root_game->{'black_elo'} = $tags->{'BlackElo'};
45 $root_game->{'event'} = $pgn->event;
46 $root_game->{'date'} = $pgn->date;
47 $root_game->{'result'} = $pgn->result;
48 $root_game->{'eco'} = $pgn->eco;
49 $root_game->{'moves'} = int(((scalar @{$pgn->moves}) + 1) / 2);
52 # Explore one move out.
53 for my $move (@{$root_aux_data->{'moves'}}) {
54 my ($np, $uci_move) = $pos->make_pretty_move($move);
57 ($json_pos, undef) = get_json_move($np, undef, $chld_in, $chld_out);
59 # See if this move exists only due to transpositions.
60 my ($alt_json_pos, undef) = get_json_move($np, $root_aux_data->{'pos_hash'}, $chld_in, $chld_out);
61 if (!defined($alt_json_pos)) {
62 $json_pos->{'transpose_only'} = 1;
65 ($json_pos, undef) = get_json_move($np, $root_aux_data->{'pos_hash'}, $chld_in, $chld_out);
67 $json_pos->{'move'} = $move;
68 push @json_moves, $json_pos;
71 print $cgi->header(-type=>'application/json');
72 print JSON::XS::encode_json({ moves => \@json_moves, opening => $opening, root_game => $root_game });
75 open my $fh, "../openings.txt"
76 or die "../openings.txt: $!";
77 for my $line (<$fh>) {
79 my ($hash, $eco, $opening, $variation, $subvariation) = split /\t/, $line;
80 if ($variation eq '') {
81 $openings{$hash} = $eco . ": " . $opening;
83 $openings{$hash} = $eco . ": " . $opening . ": " . $variation;
90 my ($pgn_file_number, $pgn_start_position) = @_;
92 open my $pgnnamesfh, "<", "../pgnnames.txt"
93 or die "../pgnnames.txt: $!";
94 while (<$pgnnamesfh>) {
100 if ($pgn_file_number > $#pgnnames) {
101 die "Unknown PGN file number $pgn_file_number";
105 open my $pgnfh, "<", "../" . $pgnnames[$pgn_file_number]
106 or die $pgnnames[$pgn_file_number] . ": $!";
107 sysseek($pgnfh, $pgn_start_position, 0)
108 or die "Could not seek to $pgn_start_position: $!";
109 sysread($pgnfh, $root_pgn, 32768)
110 or die "Could not read PGN from $pgn_start_position at $pgnnames[$pgn_file_number]: $!";
112 $root_pgn =~ s/^.*?(\[Event )/$1/s;
113 $root_pgn =~ s/^(.+?)\[Event .*/$1/s;
119 my ($pos, $filter_prev_pos_hash, $chld_in, $chld_out) = @_;
120 my $bpfen_hex = unpack('H*', $pos->bitpacked_fen);
121 my $prev_pos_hash_hex = '';
122 if (defined($filter_prev_pos_hash)) {
123 $prev_pos_hash_hex .= unpack('H*', pack('S', $filter_prev_pos_hash));
125 print $chld_in $bpfen_hex, "\n", $prev_pos_hash_hex, "\n";
127 # Read the hash of this position.
128 chomp (my $pos_hash = <$chld_out>);
130 chomp (my $line = <$chld_out>);
132 warn "Missing pos '" . $pos->fen . "' " . $filter_prev_pos_hash;
133 return (undef, undef);
136 my ($white, $draw, $black, $opening_num, $white_sum_elo, $black_sum_elo, $num_elo, $timestamp, $pgn_file_number, $pgn_start_position, @moves) = split / /, $line;
141 white_avg_elo => $num_elo == 0 ? undef : $white_sum_elo / $num_elo,
142 black_avg_elo => $num_elo == 0 ? undef : $black_sum_elo / $num_elo,
144 opening_num => $opening_num,
146 my $aux_data = { # Only relevant for the root.
147 pos_hash => $pos_hash * 1,
149 pgn_file_number => $pgn_file_number,
150 pgn_start_position => $pgn_start_position,
152 return ($json_pos, $aux_data);