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Also known as a [[Hidden Passed Pawn|hidden passed pawn]]. A kind of candidate in disguise is an [[Unfree Pawns (Bitboards)|unfree pawn]] or [[
Candidates (Bitboards)#Faker|faker]] that may become a passer through a sacrificial combination. In the diagram white may sacrifice the faker with b5-b6 - allowing black to establish a passer on b6 - but the sneaker on c6 becomes a much more advanced passer with a frontspan of only two against five:
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