Nope, that doesn't work. @{} dereferences an array ref; but split returns an array, not a reference.
The solution we are looking for here is
$current_board[$x] = [ split('-',$current_board[$x]) ];
Similarly to [ ] that builds an anonymous array, { } builds an anonymous hash and returns a reference to it. Of interest: perlref/perlreftut (=references + ref tutorial), perldsc (= data structures cookbook) and perllol (= lists of lists).
Makeshifts last the longest.
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