hmm..well i cant say you're really clear on what exactly you need, but since you did put some code that shows some kind of effort, ill tell you what i make of your question...even though its homework :)

From what i can tell you have a flat file in the format of "player_one player_two player_one_score-player_two_score", and you just need to get all the players stats, how many they've won, lost and how many draws...i'd try something like this::

#!/usr/bin/perl -w
use strict;

chomp(my $file = <STDIN>);

my (@names,@winners,@losers,@draws);
open FILE, "$file" or die "Couldnt open: $!\n";
while(<FILE>){
    my($name1,$name2,$scores) = split(/ /,$_);
    push(@names,$name1,$name2);
    my($score1,$score2) = split(/\-/,$scores);
    if($score1 > $score2){
        push(@winners, $name1);
        push(@losers, $name2);
    } elsif($score1 < $score2){
        push(@winners, $name2);
        push(@losers, $name1);
    } else {
        push(@draws,$name1,$name2);
    }
}
close FILE;

my %nams;
for(@names){
    $nams{$_}++;
}

my %wins;
for(@winners){
    $wins{$_}++;
}

my %los;
for(@losers){
    $los{$_}++;
}

my %dra;
for(@draws){
    $dra{$_}++;
}

foreach my $in(keys %nams){
    $wins{$in} = 0 unless defined $wins{$in};
    $los{$in} = 0 unless defined $los{$in};
    $dra{$in} = 0 unless defined $dra{$in};
    print "Player: $in - Wins: $wins{$in} - Losses: $los{$in} -  Draws
+: $dra{$in}\n";
}
[download]

This is very untested, so you might have to modify it a bit, if im misunderstanding what you need let me know

-Robert

Update: gave script ability to print a zero