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diff --git a/challenge-266/luca-ferrari/plpgsql/ch-2.sql b/challenge-266/luca-ferrari/plpgsql/ch-2.sql
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+--
+-- Perl Weekly Challenge 266
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-266>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc266;
+
+CREATE OR REPLACE FUNCTION
+pwc266.task2_plpgsql( s int, matrix int[] )
+RETURNS boolean
+AS $CODE$
+DECLARE
+	w int := 0;
+BEGIN
+
+
+	FOR r IN 1 .. s LOOP
+	    FOR c IN 1 .. s LOOP
+	    	w = ( r - 1 ) * s + c;
+	    	IF r = c OR c = s - r + 1 THEN
+		   IF matrix[ w ] = 0 THEN
+		      RETURN false;
+		   END IF;
+		ELSE
+		   IF matrix[ w ] <> 0 THEN
+		      RETURN false;
+		   END IF;
+		END IF;
+
+	    END LOOP;
+	END LOOP;
+
+	RETURN true;
+
+END
+$CODE$
+LANGUAGE plpgsql;