+#! /usr/bin/perl
+
+#
+# remoteglot - Connects an abitrary UCI-speaking engine to ICS for easier post-game
+# 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>
+# Licensed under the GNU General Public License, version 2.
+#
+
+use Net::Telnet;
+use FileHandle;
+use IPC::Open2;
+use Time::HiRes;
+use strict;
+use warnings;
+
+$SIG{ALRM} = sub { output_screen(); };
+
+$| = 1;
+
+my $server = "freechess.org";
+my $target = "Sesse";
+# my $engine = "/usr/games/toga2";
+my $engine = "wine rybka22-mpw32.exe";
+
+# open the chess engine
+my $pid = IPC::Open2::open2(*UCIREAD, *UCIWRITE, $engine);
+my %uciinfo = ();
+my %ficsinfo = ();
+print UCIWRITE "uci\n";
+
+# gobble the options
+while (<UCIREAD>) {
+ /uciok/ && last;
+}
+
+print UCIWRITE "setoption name UCI_AnalyseMode value true\n";
+print UCIWRITE "setoption name NalimovPath value c:\\nalimov\n";
+print UCIWRITE "setoption name NalimovUsage value Normally\n";
+print UCIWRITE "ucinewgame\n";
+
+print "Chess engine ready.\n";
+
+# now talk to FICS
+my $t = Net::Telnet->new(Timeout => 10, Prompt => '/fics% /');
+#$t->input_log(\*STDOUT);
+$t->open($server);
+$t->print("guest");
+$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 $target");
+
+# main loop
+print "FICS ready.\n";
+while (1) {
+ my $rin = '';
+ vec($rin, fileno(UCIREAD), 1) = 1;
+ vec($rin, fileno($t), 1) = 1;
+
+ my ($nfound, $timeleft) = select($rin, undef, undef, 5.0);
+ my $sleep = 1.0;
+
+ while (1) {
+ my $line = $t->getline(Timeout => 0, errmode => 'return');
+ last if (!defined($line));
+
+ chomp $line;
+ $line =~ tr/\r//d;
+ if ($line =~ /^<12> /) {
+ my $fen = style12_to_fen($line);
+ print UCIWRITE "stop\n";
+ print UCIWRITE "position fen $fen\n";
+ print UCIWRITE "go infinite\n";
+ #print "stop\n";
+ #print "position fen $fen\n";
+ #print "go infinite\n";
+ }
+ #print "FICS: [$line]\n";
+ $sleep = 0;
+ }
+
+ # any fun on the UCI channel?
+ if (vec($rin, fileno(UCIREAD), 1)) {
+ my $line = <UCIREAD>;
+ chomp $line;
+ $line =~ tr/\r//d;
+ #print "UCI: $line\n";
+ if ($line =~ /^info/) {
+ my (@infos) = split / /, $line;
+ shift @infos;
+
+ parse_infos(@infos);
+ }
+ $sleep = 0;
+
+ # don't update too often
+ Time::HiRes::alarm(0.2);
+ }
+
+ sleep $sleep;
+}
+
+sub parse_infos {
+ my (@x) = @_;
+
+ while (scalar @x > 0) {
+ if ($x[0] =~ /^(currmove|currmovenumber|time|nodes|nps|cpuload|hashfull|depth|seldepth|multipv|time|tbhits)$/) {
+ my $key = shift @x;
+ my $value = shift @x;
+ $uciinfo{$key} = $value;
+ next;
+ }
+ if ($x[0] eq 'score') {
+ shift @x;
+
+ delete $uciinfo{'score_cp'};
+ delete $uciinfo{'score_mate'};
+
+ while ($x[0] =~ /^(cp|mate|lowerbound|upperbound)$/) {
+ if ($x[0] eq 'cp') {
+ shift @x;
+ $uciinfo{'score_cp'} = shift @x;
+ } elsif ($x[0] eq 'mate') {
+ shift @x;
+ $uciinfo{'score_mate'} = shift @x;
+ } else {
+ shift @x;
+ }
+ }
+ next;
+ }
+ if ($x[0] eq 'pv') {
+ $uciinfo{'pv'} = [ @x[1..$#x] ];
+ last;
+ }
+ if ($x[0] eq 'UCI_AnalyseMode' || $x[0] eq 'setting') {
+ last;
+ }
+
+ #print "unknown info '$x[0]', trying to recover...\n";
+ #shift @x;
+ die "Unknown info '" . join(',', @x) . "'";
+
+ }
+}
+
+sub style12_to_fen {
+ my $str = shift;
+ my (@x) = split / /, $str;
+
+ $ficsinfo{'board'} = [ @x[1..8] ];
+ $ficsinfo{'toplay'} = $x[9];
+
+ # the board itself
+ my (@board) = @x[1..8];
+ for my $rank (0..7) {
+ $board[$rank] =~ s/(-+)/length($1)/ge;
+ }
+ my $fen = join('/', @board);
+
+ # white/black to move
+ $fen .= " ";
+ $fen .= lc($x[9]);
+
+ # castling
+ my $castling = "";
+ $castling .= "K" if ($x[11] == 1);
+ $castling .= "Q" if ($x[12] == 1);
+ $castling .= "k" if ($x[13] == 1);
+ $castling .= "q" if ($x[14] == 1);
+ $castling = "-" if ($castling eq "");
+ $fen .= " ";
+ $fen .= $castling;
+
+ # en passant
+ my $ep = "-";
+ if ($x[10] != -1) {
+ $ep = (qw(a b c d e f g h))[$x[10]];
+ if ($x[9] eq 'B') {
+ $ep .= "3";
+ } else {
+ $ep .= "6";
+ }
+ }
+ $fen .= " ";
+ $fen .= $ep;
+
+ # half-move clock
+ $fen .= " ";
+ $fen .= $x[15];
+
+ # full-move clock
+ $fen .= " ";
+ $fen .= $x[26];
+
+ return $fen;
+}
+
+sub prettyprint_pv {
+ my ($board, @pvs) = @_;
+
+ if (scalar @pvs == 0 || !defined($pvs[0])) {
+ return ();
+ }
+
+ my $pv = shift @pvs;
+ my $from_col = ord(substr($pv, 0, 1)) - ord('a');
+ my $from_row = 7 - (ord(substr($pv, 1, 1)) - ord('1'));
+ my $to_col = ord(substr($pv, 2, 1)) - ord('a');
+ my $to_row = 7 - (ord(substr($pv, 3, 1)) - ord('1'));
+
+ my $pretty;
+ my $piece = substr($board->[$from_row], $from_col, 1);
+
+ # white short castling
+ if ($pv eq 'e1g1' && $piece eq 'K') {
+ my @nb = @$board;
+
+ # king
+ substr($nb[7], 4, 1, '-');
+ substr($nb[7], 6, 1, $piece);
+
+ # rook
+ substr($nb[7], 7, 1, '-');
+ substr($nb[7], 5, 1, 'R');
+
+ return ('0-0', prettyprint_pv(\@nb, @pvs));
+ }
+
+ # white long castling
+ if ($pv eq 'e1b1' && $piece eq 'K') {
+ my @nb = @$board;
+
+ # king
+ substr($nb[7], 4, 1, '-');
+ substr($nb[7], 2, 1, $piece);
+
+ # rook
+ substr($nb[7], 0, 1, '-');
+ substr($nb[7], 2, 1, 'R');
+
+ return ('0-0-0', prettyprint_pv(\@nb, @pvs));
+ }
+
+ # black short castling
+ if ($pv eq 'e8g8' && $piece eq 'k') {
+ my @nb = @$board;
+
+ # king
+ substr($nb[0], 4, 1, '-');
+ substr($nb[0], 6, 1, $piece);
+
+ # rook
+ substr($nb[0], 7, 1, '-');
+ substr($nb[0], 5, 1, 'R');
+
+ return ('0-0', prettyprint_pv(\@nb, @pvs));
+ }
+
+ # black long castling
+ if ($pv eq 'e8b8' && $piece eq 'k') {
+ my @nb = @$board;
+
+ # king
+ substr($nb[0], 4, 1, '-');
+ substr($nb[0], 2, 1, $piece);
+
+ # rook
+ substr($nb[0], 0, 1, '-');
+ substr($nb[0], 2, 1, 'R');
+
+ return ('0-0-0', prettyprint_pv(\@nb, @pvs));
+ }
+
+ # check if the from-piece is a pawn
+ if (lc($piece) eq 'p') {
+ # attack?
+ if (substr($board->[$to_row], $to_col, 1) ne '-') {
+ $pretty = substr($pv, 0, 1) . 'x' . substr($pv, 2, 2);
+ } else {
+ $pretty = substr($pv, 2, 2);
+
+ if (length($pv) == 5) {
+ # promotion
+ $pretty .= "=";
+ $pretty .= uc(substr($pv, 4, 1));
+
+ if ($piece eq 'p') {
+ $piece = substr($pv, 4, 1);
+ } else {
+ $piece = uc(substr($pv, 4, 1));
+ }
+ }
+ }
+ } else {
+ $pretty = uc($piece);
+
+ # see how many of these pieces could go here, in all
+ my $num_total = 0;
+ for my $col (0..7) {
+ for my $row (0..7) {
+ next unless (substr($board->[$row], $col, 1) eq $piece);
+ ++$num_total if (can_reach($board, $piece, $row, $col, $to_row, $to_col));
+ }
+ }
+
+ # see how many of these pieces from the given row could go here
+ my $num_row = 0;
+ for my $col (0..7) {
+ next unless (substr($board->[$from_row], $col, 1) eq $piece);
+ ++$num_row if (can_reach($board, $piece, $from_row, $col, $to_row, $to_col));
+ }
+
+ # and same for columns
+ my $num_col = 0;
+ for my $row (0..7) {
+ next unless (substr($board->[$row], $from_col, 1) eq $piece);
+ ++$num_col if (can_reach($board, $piece, $row, $from_col, $to_row, $to_col));
+ }
+
+ # see if we need to disambiguate
+ if ($num_total > 1) {
+ if ($num_col == 1) {
+ $pretty .= substr($pv, 0, 1);
+ } elsif ($num_row == 1) {
+ $pretty .= substr($pv, 1, 1);
+ } else {
+ $pretty .= substr($pv, 0, 2);
+ }
+ }
+
+ # attack?
+ if (substr($board->[$to_row], $to_col, 1) ne '-') {
+ $pretty .= 'x';
+ }
+
+ $pretty .= substr($pv, 2, 2);
+ }
+
+ # update the board
+ my @nb = @$board;
+ substr($nb[$from_row], $from_col, 1, '-');
+ substr($nb[$to_row], $to_col, 1, $piece);
+
+ if (in_mate(\@nb)) {
+ $pretty .= '#';
+ } elsif (in_check(\@nb) ne 'none') {
+ $pretty .= '+';
+ }
+
+ return ($pretty, prettyprint_pv(\@nb, @pvs));
+}
+
+sub output_screen {
+ #return;
+
+ print "\ecAnalysis:\n";
+ if (defined($uciinfo{'score_mate'})) {
+ printf " Mate in %d\n", $uciinfo{'score_mate'};
+ } else {
+ my $score = $uciinfo{'score_cp'} * 0.01;
+ if ($ficsinfo{'toplay'} eq 'B') {
+ $score = -$score;
+ }
+ printf " Score: %+5.2f\n", $score;
+ }
+ print " PV: ", join(', ', prettyprint_pv($ficsinfo{'board'}, @{$uciinfo{'pv'}}));
+ print "\n";
+ printf " %u nodes, %7u nodes/sec, depth %u ply",
+ $uciinfo{'nodes'}, $uciinfo{'nps'}, $uciinfo{'depth'};
+ if (exists($uciinfo{'tbhits'})) {
+ printf ", %u Nalimov hits", $uciinfo{'tbhits'};
+ }
+ if (exists($uciinfo{'seldepth'})) {
+ printf " (%u selective)", $uciinfo{'seldepth'};
+ }
+ print "\n\n";
+}
+
+sub find_kings {
+ my $board = shift;
+ my ($wkr, $wkc, $bkr, $bkc);
+
+ for my $row (0..7) {
+ for my $col (0..7) {
+ my $piece = substr($board->[$row], $col, 1);
+ if ($piece eq 'K') {
+ ($wkr, $wkc) = ($row, $col);
+ } elsif ($piece eq 'k') {
+ ($bkr, $bkc) = ($row, $col);
+ }
+ }
+ }
+
+ return ($wkr, $wkc, $bkr, $bkc);
+}
+
+sub in_mate {
+ my $board = shift;
+ my $check = in_check($board);
+ return 0 if ($check eq 'none');
+
+ # try all possible moves for the side in check
+ for my $row (0..7) {
+ for my $col (0..7) {
+ my $piece = substr($board->[$row], $col, 1);
+ next if ($piece eq '-');
+
+ if ($check eq 'white') {
+ next if ($piece eq lc($piece));
+ } else {
+ next if ($piece eq uc($piece));
+ }
+
+ for my $dest_row (0..7) {
+ for my $dest_col (0..7) {
+ next if ($row == $dest_row && $col == $dest_col);
+ next unless (can_reach($board, $piece, $row, $col, $dest_row, $dest_col));
+
+ my @nb = @$board;
+ substr($nb[$row], $col, 1, '-');
+ substr($nb[$dest_row], $dest_col, 1, $piece);
+
+ my $new_check = in_check(\@nb);
+ return 0 if ($new_check ne $check && $new_check ne 'both');
+ }
+ }
+ }
+ }
+
+ # nothing to do; mate
+ return 1;
+}
+
+sub in_check {
+ my $board = shift;
+ my ($black_check, $white_check) = (0, 0);
+
+ my ($wkr, $wkc, $bkr, $bkc) = find_kings($board);
+
+ # check all pieces for the possibility of threatening the two kings
+ for my $row (0..7) {
+ for my $col (0..7) {
+ my $piece = substr($board->[$row], $col, 1);
+ next if ($piece eq '-' || lc($piece) eq 'k');
+
+ if (uc($piece) eq $piece) {
+ # white piece
+ $black_check = 1 if (can_reach($board, $piece, $row, $col, $bkr, $bkc));
+ } else {
+ # black piece
+ $white_check = 1 if (can_reach($board, $piece, $row, $col, $wkr, $wkc));
+ }
+ }
+ }
+
+ if ($black_check && $white_check) {
+ return 'both';
+ } elsif ($black_check) {
+ return 'black';
+ } elsif ($white_check) {
+ return 'white';
+ } else {
+ return 'none';
+ }
+}
+
+sub can_reach {
+ my ($board, $piece, $from_row, $from_col, $to_row, $to_col) = @_;
+
+ # can't eat your own piece
+ my $dest_piece = substr($board->[$to_row], $to_col, 1);
+ if ($dest_piece ne '-') {
+ return 0 if (($piece eq lc($piece)) == ($dest_piece eq lc($dest_piece)));
+ }
+
+ if (lc($piece) eq 'k') {
+ return (abs($from_row - $to_row) <= 1 && abs($from_col - $to_col) <= 1);
+ }
+ if (lc($piece) eq 'r') {
+ return 0 unless ($from_row == $to_row || $from_col == $to_col);
+
+ # check that there's a clear passage
+ if ($from_row == $to_row) {
+ if ($from_col > $to_col) {
+ ($to_col, $from_col) = ($from_col, $to_col);
+ }
+
+ for my $c (($from_col+1)..($to_col-1)) {
+ my $middle_piece = substr($board->[$to_row], $c, 1);
+ return 0 if ($middle_piece ne '-');
+ }
+
+ return 1;
+ } else {
+ if ($from_row > $to_row) {
+ ($to_row, $from_row) = ($from_row, $to_row);
+ }
+
+ for my $r (($from_row+1)..($to_row-1)) {
+ my $middle_piece = substr($board->[$r], $to_col, 1);
+ return 0 if ($middle_piece ne '-');
+ }
+
+ return 1;
+ }
+ }
+ if (lc($piece) eq 'b') {
+ return 0 unless (abs($from_row - $to_row) == abs($from_col - $to_col));
+
+ my $dr = ($to_row - $from_row) / abs($to_row - $from_row);
+ my $dc = ($to_col - $from_col) / abs($to_col - $from_col);
+
+ my $r = $from_row + $dr;
+ my $c = $from_col + $dc;
+
+ while ($r != $to_row) {
+ my $middle_piece = substr($board->[$r], $c, 1);
+ return 0 if ($middle_piece ne '-');
+
+ $r += $dr;
+ $c += $dc;
+ }
+
+ return 1;
+ }
+ if (lc($piece) eq 'n') {
+ my $diff_r = abs($from_row - $to_row);
+ my $diff_c = abs($from_col - $to_col);
+ return 1 if ($diff_r == 2 && $diff_c == 1);
+ return 1 if ($diff_r == 1 && $diff_c == 2);
+ return 0;
+ }
+ if ($piece eq 'q') {
+ return (can_reach($board, 'r', $from_row, $from_col, $to_row, $to_col) ||
+ can_reach($board, 'b', $from_row, $from_col, $to_row, $to_col));
+ }
+ if ($piece eq 'Q') {
+ return (can_reach($board, 'R', $from_row, $from_col, $to_row, $to_col) ||
+ can_reach($board, 'B', $from_row, $from_col, $to_row, $to_col));
+ }
+ if ($piece eq 'p') {
+ # black pawn
+ if ($to_col == $from_col && $to_row == $from_row + 1) {
+ return ($dest_piece eq '-');
+ }
+ if (abs($to_col - $from_col) == 1 && $to_row == $from_row + 1) {
+ return ($dest_piece ne '-');
+ }
+ return 0;
+ }
+ if ($piece eq 'P') {
+ # white pawn
+ if ($to_col == $from_col && $to_row == $from_row - 1) {
+ return ($dest_piece eq '-');
+ }
+ if (abs($to_col - $from_col) == 1 && $to_row == $from_row - 1) {
+ return ($dest_piece ne '-');
+ }
+ return 0;
+ }
+
+ # unknown piece
+ return 0;
+}
projects / remoteglot / commitdiff