When FC Barcelona won the 2009 Champions League with essentially a 4-3-3 formation featuring Lionel Messi as a 'false nine' (a withdrawn striker) much was written about Guardiola's tactical genius.
Of course, Pep didn't actually invent that system. Cruyff himself played as a false nine behind two wide strikers in the seventies for Ajax and Holland.
Here's a brilliant clip from 2004 in which Cruyff, with the help of a chalkboard, attempts to explain 'his' diamond formation.
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The Flying Dutchmen -- #allin or nothing -- adidas Football