return $nb;
}
+sub _pos_to_square {
+ my ($row, $col) = @_;
+ return sprintf("%c%d", ord('a') + $col, 8 - $row);
+}
+
sub _move_to_uci_notation {
my ($from_row, $from_col, $to_row, $to_col, $promo) = @_;
$promo //= "";
- return sprintf("%c%d%c%d%s", ord('a') + $from_col, 8 - $from_row, ord('a') + $to_col, 8 - $to_row, $promo);
+ return _pos_to_square($from_row, $from_col) . _pos_to_square($to_row, $to_col) . $promo;
}
sub fen {
return 1;
}
+# Returns the short algebraic form of the move, as well as the new position.
+sub prettyprint_move {
+ my ($board, $from_row, $from_col, $to_row, $to_col, $promo) = @_;
+ my $pretty = $board->_prettyprint_move_no_check_or_mate($from_row, $from_col, $to_row, $to_col, $promo);
+
+ my $nb = $board->make_move($from_row, $from_col, $to_row, $to_col, $promo);
+ if ($nb->in_mate()) {
+ $pretty .= '#';
+ } elsif ($nb->in_check() ne 'none') {
+ $pretty .= '+';
+ }
+ return ($pretty, $nb);
+}
+
+sub _prettyprint_move_no_check_or_mate {
+ my ($board, $from_row, $from_col, $to_row, $to_col, $promo) = @_;
+ my $piece = $board->[$from_row][$from_col];
+ my $move = _move_to_uci_notation($from_row, $from_col, $to_row, $to_col, $promo);
+
+ if ($piece eq '-') {
+ die "Invalid move $move";
+ }
+
+ # white short castling
+ if ($move eq 'e1g1' && $piece eq 'K') {
+ return '0-0';
+ }
+
+ # white long castling
+ if ($move eq 'e1c1' && $piece eq 'K') {
+ return '0-0-0';
+ }
+
+ # black short castling
+ if ($move eq 'e8g8' && $piece eq 'k') {
+ return '0-0';
+ }
+
+ # black long castling
+ if ($move eq 'e8c8' && $piece eq 'k') {
+ return '0-0-0';
+ }
+
+ my $pretty;
+
+ # check if the from-piece is a pawn
+ if (lc($piece) eq 'p') {
+ # attack?
+ if ($from_col != $to_col) {
+ $pretty = substr($move, 0, 1) . 'x' . _pos_to_square($to_row, $to_col);
+ } else {
+ $pretty = _pos_to_square($to_row, $to_col);
+
+ if (defined($promo) && $promo ne '') {
+ # promotion
+ $pretty .= "=";
+ $pretty .= $promo;
+ }
+ }
+ return $pretty;
+ }
+
+ $pretty = uc($piece);
+
+ # see how many of these pieces could go here, in all
+ my $num_total = 0;
+ for my $col (0..7) {
+ for my $row (0..7) {
+ next unless ($board->[$row][$col] eq $piece);
+ ++$num_total if ($board->can_reach($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 $col (0..7) {
+ next unless ($board->[$from_row][$col] eq $piece);
+ ++$num_row if ($board->can_reach($piece, $from_row, $col, $to_row, $to_col));
+ }
+
+ # and same for columns
+ my $num_col = 0;
+ for my $row (0..7) {
+ next unless ($board->[$row][$from_col] eq $piece);
+ ++$num_col if ($board->can_reach($piece, $row, $from_col, $to_row, $to_col));
+ }
+
+ # see if we need to disambiguate
+ if ($num_total > 1) {
+ if ($num_col == 1) {
+ $pretty .= substr($move, 0, 1);
+ } elsif ($num_row == 1) {
+ $pretty .= substr($move, 1, 1);
+ } else {
+ $pretty .= substr($move, 0, 2);
+ }
+ }
+
+ # attack?
+ if ($board->[$to_row][$to_col] ne '-') {
+ $pretty .= 'x';
+ }
+
+ $pretty .= _pos_to_square($to_row, $to_col);
+ return $pretty;
+}
+
1;
my $to_row = row_letter_to_num(substr($pv, 3, 1));
my $promo = substr($pv, 4, 1);
- my $nb = $board->make_move($from_row, $from_col, $to_row, $to_col, $promo);
- my $piece = $board->[$from_row][$from_col];
-
- if ($piece eq '-') {
- die "Invalid move $pv";
- }
-
- # white short castling
- if ($pv eq 'e1g1' && $piece eq 'K') {
- return ('0-0', prettyprint_pv($nb, @pvs));
- }
-
- # white long castling
- if ($pv eq 'e1c1' && $piece eq 'K') {
- return ('0-0-0', prettyprint_pv($nb, @pvs));
- }
-
- # black short castling
- if ($pv eq 'e8g8' && $piece eq 'k') {
- return ('0-0', prettyprint_pv($nb, @pvs));
- }
-
- # black long castling
- if ($pv eq 'e8c8' && $piece eq 'k') {
- return ('0-0-0', prettyprint_pv($nb, @pvs));
- }
-
- my $pretty;
-
- # check if the from-piece is a pawn
- if (lc($piece) eq 'p') {
- # attack?
- if ($from_col != $to_col) {
- $pretty = substr($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 $row (0..7) {
- next unless ($board->[$row][$col] eq $piece);
- ++$num_total if ($board->can_reach($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 $col (0..7) {
- next unless ($board->[$from_row][$col] eq $piece);
- ++$num_row if ($board->can_reach($piece, $from_row, $col, $to_row, $to_col));
- }
-
- # and same for columns
- my $num_col = 0;
- for my $row (0..7) {
- next unless ($board->[$row][$from_col] eq $piece);
- ++$num_col if ($board->can_reach($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 ($board->[$to_row][$to_col] ne '-') {
- $pretty .= 'x';
- }
-
- $pretty .= substr($pv, 2, 2);
- }
-
- if ($nb->in_mate()) {
- $pretty .= '#';
- } elsif ($nb->in_check() ne 'none') {
- $pretty .= '+';
- }
+ my ($pretty, $nb) = $board->prettyprint_move($from_row, $from_col, $to_row, $to_col, $promo);
return ($pretty, prettyprint_pv($nb, @pvs));
}