57...Be3 and Black is safe as the rook keeps the enemy king and rook busy defending their pawns; B) 53...&a4 54.Bxd5 (in case of 54.Sb5 Se6 or 54.Sc6+ 2e6 55.flxe6+ (4>xe6 White has no advantage) 54...£sxb2 55.Ae4 (55.Sd6+ 4?e5) 55...Sc7 56.Bd6+ 4>e5 57.Bd5+
and Black cannot be pushed aside. 53.<4>e3!
The block is removed and so the white king gets to the centre, where it will be highly influential. 53...<S?f6
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