- Added solutions by Luca Ferrari.

- Added solutions by Robert Ransbottom.
- Added solutions by Laurent Rosenfeld.

25 files changed, 2974 insertions, 2854 deletions

diff --git a/challenge-281/laurent-rosenfeld/blog1.txt b/challenge-281/laurent-rosenfeld/blog1.txt
new file mode 100644
index 0000000000..a825148645
--- /dev/null
+++ b/challenge-281/laurent-rosenfeld/blog1.txt
@@ -0,0 +1 @@
+https://blogs.perl.org/users/laurent_r/2024/08/perl-weekly-challenge-281-knights-move.html
diff --git a/challenge-281/laurent-rosenfeld/perl/ch-2.pl b/challenge-281/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..78b804f8bd
--- /dev/null
+++ b/challenge-281/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,45 @@
+use strict;
+use warnings;
+use feature 'say';
+
+my @moves = ( [<2 1>], [<2 -1>], [<1 2>], [<1 -2>],
+              [<-1 2>], [<-1 -2>], [<-2 1>], [<-2 -1>] );
+
+sub to_coordinates {
+    my ($col, $row) = split //, shift;
+    return ord($col) - ord('a'), $row - 1;
+}
+
+sub find_shortest  {
+    my ($st_in, $end_in) = @_;
+    # convert input to Cartesian coordinates
+    my @start = to_coordinates $st_in;
+    my @end = to_coordinates $end_in;
+
+    my @to_be_explored;  # a queue of squares to be visited
+    push @to_be_explored, [0, @start];
+    my %seen = ("@start" => 1);  # already visited squares
+    while (@to_be_explored) {
+        my $node = shift @to_be_explored;
+        my ($depth, @current) = @$node;
+        return $depth if "@current" eq "@end";
+        for my $move (@moves) {
+            my @next = ( $current[0] + $move->[0],
+                         $current[1] + $move->[1] );
+            # dismiss if computed position not on chessboard
+            next if $next[0] > 7 or $next[0] < 0 or
+                    $next[1] > 7 or $next[1] < 0;
+            # dismiss if computed position already visited
+            next if exists $seen{"@next"};
+            # update seen hash and to_be_explored queue
+            $seen{"@next"} = 1;
+            push @to_be_explored, [$depth + 1, @next];
+        }
+    }
+}
+
+my @tests = ([<g2 a8>], [<g2 h2>]);
+for my $test (@tests) {
+    printf "%-6s => ", "@$test";
+    say find_shortest @$test;;
+}
diff --git a/challenge-281/laurent-rosenfeld/raku/ch-2.raku b/challenge-281/laurent-rosenfeld/raku/ch-2.raku
new file mode 100644
index 0000000000..930a2ec7fe
--- /dev/null
+++ b/challenge-281/laurent-rosenfeld/raku/ch-2.raku
@@ -0,0 +1,40 @@
+my @moves = <2 1>, <2 -1>, <1 2>, <1 -2>,
+            <-1 2>, <-1 -2>, <-2 1>, <-2 -1>;
+
+sub to-coordinates ($in) {
+    my ($col, $row) = $in.comb;
+    return $col.ord - 'a'.ord, $row - 1;
+}
+
+sub find-shortest ($st-in, $end-in) {
+    # convert input to Cartesian coordinates
+    my @start = to-coordinates $st-in;
+    my @end = to-coordinates $end-in;
+
+    my @to-be-explored;  # a queue of squares to be visited
+    push @to-be-explored, (0, @start).flat;
+    my %seen = "@start[]" => 1;  # already visited squares
+
+    while @to-be-explored {
+        my @node = shift @to-be-explored;
+        my ($depth, @current) = @node[0];
+        return $depth if "@current[]" eq "@end[]";
+        for @moves -> @move {
+            my @next = @current[0] + @move[0],
+                       @current[1] + @move[1];
+            # dismiss if computed position not on chessboard
+            next if @next.any > 7 or @next.any < 0;
+            # dismiss if computed position already visited
+            next if %seen{"@next[]"}:exists;
+            # update seen hash and to-be-explored queue
+            %seen{"@next[]"} = 1;
+            push @to-be-explored, ($depth + 1, @next).flat;
+        }
+    }
+}
+
+my @tests = <g2 a8>, <g2 h2>;
+for @tests -> @test {
+    printf "%-6s => ", "@test[]";
+    say find-shortest @test[0], @test[1];
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index beba319a87..14f69a3647 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,146 +1,15 @@
 {
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
+   "xAxis" : {
+      "type" : "category"
    },
-   "legend" : {
-      "enabled" : 0
+   "subtitle" : {
+      "text" : "[Champions: 22] Last updated at 2024-08-08 15:35:51 GMT"
    },
    "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
       "followPointer" : 1,
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
       "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
    },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "series" : [
-      {
-         "name" : "The Weekly Challenge - 281",
-         "colorByPoint" : 1,
-         "data" : [
-            {
-               "name" : "Alexander Karelas",
-               "drilldown" : "Alexander Karelas",
-               "y" : 2
-            },
-            {
-               "name" : "Dave Jacoby",
-               "drilldown" : "Dave Jacoby",
-               "y" : 3
-            },
-            {
-               "name" : "David Ferrone",
-               "drilldown" : "David Ferrone",
-               "y" : 2
-            },
-            {
-               "y" : 2,
-               "drilldown" : "E. Choroba",
-               "name" : "E. Choroba"
-            },
-            {
-               "drilldown" : "Feng Chang",
-               "y" : 2,
-               "name" : "Feng Chang"
-            },
-            {
-               "drilldown" : "Jan Krnavek",
-               "y" : 2,
-               "name" : "Jan Krnavek"
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Kjetil Skotheim",
-               "name" : "Kjetil Skotheim"
-            },
-            {
-               "drilldown" : "Laurent Rosenfeld",
-               "y" : 3,
-               "name" : "Laurent Rosenfeld"
-            },
-            {
-               "drilldown" : "Mariano Ortega",
-               "y" : 2,
-               "name" : "Mariano Ortega"
-            },
-            {
-               "drilldown" : "Mark Anderson",
-               "y" : 2,
-               "name" : "Mark Anderson"
-            },
-            {
-               "name" : "Packy Anderson",
-               "drilldown" : "Packy Anderson",
-               "y" : 5
-            },
-            {
-               "name" : "Peter Campbell Smith",
-               "drilldown" : "Peter Campbell Smith",
-               "y" : 3
-            },
-            {
-               "name" : "Peter Meszaros",
-               "drilldown" : "Peter Meszaros",
-               "y" : 2
-            },
-            {
-               "name" : "Reinier Maliepaard",
-               "drilldown" : "Reinier Maliepaard",
-               "y" : 3
-            },
-            {
-               "y" : 3,
-               "drilldown" : "Robbie Hatley",
-               "name" : "Robbie Hatley"
-            },
-            {
-               "y" : 4,
-               "drilldown" : "Roger Bell_West",
-               "name" : "Roger Bell_West"
-            },
-            {
-               "name" : "Thomas Kohler",
-               "drilldown" : "Thomas Kohler",
-               "y" : 4
-            },
-            {
-               "y" : 4,
-               "drilldown" : "Ulrich Rieke",
-               "name" : "Ulrich Rieke"
-            },
-            {
-               "drilldown" : "W. Luis Mochan",
-               "y" : 3,
-               "name" : "W. Luis Mochan"
-            },
-            {
-               "drilldown" : "Wanderdoc",
-               "y" : 2,
-               "name" : "Wanderdoc"
-            }
-         ]
-      }
-   ],
-   "title" : {
-      "text" : "The Weekly Challenge - 281"
-   },
-   "xAxis" : {
-      "type" : "category"
-   },
-   "subtitle" : {
-      "text" : "[Champions: 20] Last updated at 2024-08-08 08:45:06 GMT"
-   },
    "drilldown" : {
       "series" : [
          {
@@ -154,8 +23,6 @@
             ]
          },
          {
-            "name" : "Dave Jacoby",
-            "id" : "Dave Jacoby",
             "data" : [
                [
                   "Perl",
@@ -165,47 +32,49 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Dave Jacoby",
+            "name" : "Dave Jacoby"
          },
          {
             "name" : "David Ferrone",
-            "id" : "David Ferrone",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "David Ferrone"
          },
          {
-            "name" : "E. Choroba",
+            "id" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "E. Choroba"
+            "name" : "E. Choroba"
          },
          {
+            "id" : "Feng Chang",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Feng Chang",
             "name" : "Feng Chang"
          },
          {
+            "name" : "Jan Krnavek",
             "id" : "Jan Krnavek",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Jan Krnavek"
+            ]
          },
          {
             "name" : "Kjetil Skotheim",
@@ -218,45 +87,58 @@
             "id" : "Kjetil Skotheim"
          },
          {
-            "id" : "Laurent Rosenfeld",
+            "name" : "Laurent Rosenfeld",
             "data" : [
                [
                   "Perl",
-                  1
+                  2
                ],
                [
                   "Raku",
-                  1
+                  2
                ],
                [
                   "Blog",
-                  1
+                  2
+               ]
+            ],
+            "id" : "Laurent Rosenfeld"
+         },
+         {
+            "id" : "Luca Ferrari",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
                ]
             ],
-            "name" : "Laurent Rosenfeld"
+            "name" : "Luca Ferrari"
          },
          {
-            "name" : "Mariano Ortega",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "Mariano Ortega"
+            "id" : "Mariano Ortega",
+            "name" : "Mariano Ortega"
          },
          {
+            "name" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Mark Anderson",
-            "name" : "Mark Anderson"
+            "id" : "Mark Anderson"
          },
          {
-            "name" : "Packy Anderson",
             "data" : [
                [
                   "Perl",
@@ -271,10 +153,10 @@
                   1
                ]
             ],
-            "id" : "Packy Anderson"
+            "id" : "Packy Anderson",
+            "name" : "Packy Anderson"
          },
          {
-            "id" : "Peter Campbell Smith",
             "data" : [
                [
                   "Perl",
@@ -285,19 +167,21 @@
                   1
                ]
             ],
+            "id" : "Peter Campbell Smith",
             "name" : "Peter Campbell Smith"
          },
          {
+            "name" : "Peter Meszaros",
             "id" : "Peter Meszaros",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Peter Meszaros"
+            ]
          },
          {
+            "id" : "Reinier Maliepaard",
             "data" : [
                [
                   "Perl",
@@ -308,11 +192,10 @@
                   1
                ]
             ],
-            "id" : "Reinier Maliepaard",
             "name" : "Reinier Maliepaard"
          },
          {
-            "name" : "Robbie Hatley",
+            "id" : "Robbie Hatley",
             "data" : [
                [
                   "Perl",
@@ -323,10 +206,19 @@
                   1
                ]
             ],
-            "id" : "Robbie Hatley"
+            "name" : "Robbie Hatley"
+         },
+         {
+            "id" : "Robert Ransbottom",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "name" : "Robert Ransbottom"
          },
          {
-            "name" : "Roger Bell_West",
             "id" : "Roger Bell_West",
             "data" : [
                [
@@ -337,7 +229,8 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "name" : "Roger Bell_West"
          },
          {
             "name" : "Thomas Kohler",
@@ -354,7 +247,6 @@
             ]
          },
          {
-            "id" : "Ulrich Rieke",
             "data" : [
                [
                   "Perl",
@@ -365,9 +257,12 @@
                   2
                ]
             ],
+            "id" : "Ulrich Rieke",
             "name" : "Ulrich Rieke"
          },
          {
+            "name" : "W. Luis Mochan",
+            "id" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -377,20 +272,159 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "W. Luis Mochan",
-            "name" : "W. Luis Mochan"
+            ]
          },
          {
+            "id" : "Wanderdoc",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "Wanderdoc",
             "name" : "Wanderdoc"
          }
       ]
-   }
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "title" : {
+      "text" : "The Weekly Challenge - 281"
+   },
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "series" : [
+      {
+         "data" : [
+            {
+               "name" : "Alexander Karelas",
+               "drilldown" : "Alexander Karelas",
+               "y" : 2
+            },
+            {
+               "name" : "Dave Jacoby",
+               "y" : 3,
+               "drilldown" : "Dave Jacoby"
+            },
+            {
+               "name" : "David Ferrone",
+               "drilldown" : "David Ferrone",
+               "y" : 2
+            },
+            {
+               "name" : "E. Choroba",
+               "drilldown" : "E. Choroba",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Feng Chang",
+               "y" : 2,
+               "name" : "Feng Chang"
+            },
+            {
+               "name" : "Jan Krnavek",
+               "y" : 2,
+               "drilldown" : "Jan Krnavek"
+            },
+            {
+               "name" : "Kjetil Skotheim",
+               "y" : 2,
+               "drilldown" : "Kjetil Skotheim"
+            },
+            {
+               "name" : "Laurent Rosenfeld",
+               "y" : 6,
+               "drilldown" : "Laurent Rosenfeld"
+            },
+            {
+               "drilldown" : "Luca Ferrari",
+               "y" : 4,
+               "name" : "Luca Ferrari"
+            },
+            {
+               "drilldown" : "Mariano Ortega",
+               "y" : 2,
+               "name" : "Mariano Ortega"
+            },
+            {
+               "drilldown" : "Mark Anderson",
+               "y" : 2,
+               "name" : "Mark Anderson"
+            },
+            {
+               "drilldown" : "Packy Anderson",
+               "y" : 5,
+               "name" : "Packy Anderson"
+            },
+            {
+               "name" : "Peter Campbell Smith",
+               "y" : 3,
+               "drilldown" : "Peter Campbell Smith"
+            },
+            {
+               "name" : "Peter Meszaros",
+               "y" : 2,
+               "drilldown" : "Peter Meszaros"
+            },
+            {
+               "drilldown" : "Reinier Maliepaard",
+               "y" : 3,
+               "name" : "Reinier Maliepaard"
+            },
+            {
+               "y" : 3,
+               "drilldown" : "Robbie Hatley",
+               "name" : "Robbie Hatley"
+            },
+            {
+               "name" : "Robert Ransbottom",
+               "drilldown" : "Robert Ransbottom",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "drilldown" : "Thomas Kohler",
+               "y" : 4,
+               "name" : "Thomas Kohler"
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Ulrich Rieke",
+               "name" : "Ulrich Rieke"
+            },
+            {
+               "name" : "W. Luis Mochan",
+               "y" : 3,
+               "drilldown" : "W. Luis Mochan"
+            },
+            {
+               "drilldown" : "Wanderdoc",
+               "y" : 2,
+               "name" : "Wanderdoc"
+            }
+         ],
+         "name" : "The Weekly Challenge - 281",
+         "colorByPoint" : 1
+      }
+   ]
 }
diff --git a/stats/pwc-language-breakdown-2019.json b/stats/pwc-language-breakdown-2019.json
index 6e7c81dbfb..01396845e8 100644
--- a/stats/pwc-language-breakdown-2019.json
+++ b/stats/pwc-language-breakdown-2019.json
@@ -1,8 +1,241 @@
 {
+   "chart" : {
+      "type" : "column"
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "series" : [
+      {
+         "name" : "The Weekly Challenge Languages",
+         "data" : [
+            {
+               "y" : 80,
+               "drilldown" : "041",
+               "name" : "041"
+            },
+            {
+               "name" : "040",
+               "y" : 77,
+               "drilldown" : "040"
+            },
+            {
+               "y" : 68,
+               "drilldown" : "039",
+               "name" : "039"
+            },
+            {
+               "name" : "038",
+               "y" : 74,
+               "drilldown" : "038"
+            },
+            {
+               "y" : 70,
+               "drilldown" : "037",
+               "name" : "037"
+            },
+            {
+               "name" : "036",
+               "y" : 70,
+               "drilldown" : "036"
+            },
+            {
+               "name" : "035",
+               "drilldown" : "035",
+               "y" : 68
+            },
+            {
+               "name" : "034",
+               "y" : 70,
+               "drilldown" : "034"
+            },
+            {
+               "y" : 113,
+               "drilldown" : "033",
+               "name" : "033"
+            },
+            {
+               "name" : "032",
+               "drilldown" : "032",
+               "y" : 97
+            },
+            {
+               "drilldown" : "031",
+               "y" : 93,
+               "name" : "031"
+            },
+            {
+               "drilldown" : "030",
+               "y" : 120,
+               "name" : "030"
+            },
+            {
+               "name" : "029",
+               "drilldown" : "029",
+               "y" : 83
+            },
+            {
+               "y" : 82,
+               "drilldown" : "028",
+               "name" : "028"
+            },
+            {
+               "drilldown" : "027",
+               "y" : 64,
+               "name" : "027"
+            },
+            {
+               "name" : "026",
+               "y" : 75,
+               "drilldown" : "026"
+            },
+            {
+               "name" : "025",
+               "drilldown" : "025",
+               "y" : 62
+            },
+            {
+               "y" : 77,
+               "drilldown" : "024",
+               "name" : "024"
+            },
+            {
+               "drilldown" : "023",
+               "y" : 88,
+               "name" : "023"
+            },
+            {
+               "name" : "022",
+               "drilldown" : "022",
+               "y" : 72
+            },
+            {
+               "y" : 72,
+               "drilldown" : "021",
+               "name" : "021"
+            },
+            {
+               "name" : "020",
+               "y" : 100,
+               "drilldown" : "020"
+            },
+            {
+               "drilldown" : "019",
+               "y" : 101,
+               "name" : "019"
+            },
+            {
+               "name" : "018",
+               "y" : 82,
+               "drilldown" : "018"
+            },
+            {
+               "name" : "017",
+               "y" : 83,
+               "drilldown" : "017"
+            },
+            {
+               "drilldown" : "016",
+               "y" : 75,
+               "name" : "016"
+            },
+            {
+               "drilldown" : "015",
+               "y" : 95,
+               "name" : "015"
+            },
+            {
+               "y" : 98,
+               "drilldown" : "014",
+               "name" : "014"
+            },
+            {
+               "name" : "013",
+               "drilldown" : "013",
+               "y" : 85
+            },
+            {
+               "drilldown" : "012",
+               "y" : 90,
+               "name" : "012"
+            },
+            {
+               "y" : 86,
+               "drilldown" : "011",
+               "name" : "011"
+            },
+            {
+               "y" : 69,
+               "drilldown" : "010",
+               "name" : "010"
+            },
+            {
+               "name" : "009",
+               "y" : 79,
+               "drilldown" : "009"
+            },
+            {
+               "name" : "008",
+               "drilldown" : "008",
+               "y" : 82
+            },
+            {
+               "drilldown" : "007",
+               "y" : 71,
+               "name" : "007"
+            },
+            {
+               "name" : "006",
+               "drilldown" : "006",
+               "y" : 63
+            },
+            {
+               "drilldown" : "005",
+               "y" : 82,
+               "name" : "005"
+            },
+            {
+               "name" : "004",
+               "drilldown" : "004",
+               "y" : 106
+            },
+            {
+               "name" : "003",
+               "y" : 91,
+               "drilldown" : "003"
+            },
+            {
+               "name" : "002",
+               "drilldown" : "002",
+               "y" : 133
+            },
+            {
+               "drilldown" : "001",
+               "y" : 165,
+               "name" : "001"
+            }
+         ],
+         "colorByPoint" : "true"
+      }
+   ],
+   "xAxis" : {
+      "type" : "category"
+   },
+   "subtitle" : {
+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2024-08-08 15:35:51 GMT"
+   },
+   "tooltip" : {
+      "headerFormat" : "<span style=\"font-size:11px\"></span>",
+      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : "true"
+   },
    "drilldown" : {
       "series" : [
          {
             "name" : "041",
+            "id" : "041",
             "data" : [
                [
                   "Perl",
@@ -16,8 +249,7 @@
                   "Blog",
                   9
                ]
-            ],
-            "id" : "041"
+            ]
          },
          {
             "name" : "040",
@@ -57,7 +289,6 @@
          },
          {
             "name" : "038",
-            "id" : "038",
             "data" : [
                [
                   "Perl",
@@ -71,9 +302,11 @@
                   "Blog",
                   12
                ]
-            ]
+            ],
+            "id" : "038"
          },
          {
+            "id" : "037",
             "data" : [
                [
                   "Perl",
@@ -88,7 +321,6 @@
                   9
                ]
             ],
-            "id" : "037",
             "name" : "037"
          },
          {
@@ -128,7 +360,6 @@
             "name" : "035"
          },
          {
-            "name" : "034",
             "data" : [
                [
                   "Perl",
@@ -143,7 +374,8 @@
                   11
                ]
             ],
-            "id" : "034"
+            "id" : "034",
+            "name" : "034"
          },
          {
             "id" : "033",
@@ -165,7 +397,6 @@
          },
          {