Monday’s 5-second tactics

“Fall. Stand. Learn. Adapt.”
― Mike Norton, Fighting For Redemption
————————————–
gm Mamedyarov, Shakhriyar
gm Ivanchuk, Vassily
41st Olympiad Open 2014.8.12 Position after 24 moves of play. Black is a bit better (he will soon recover the pawn on c5 and his Knight is more active than White’s Bishop) but White should have no real problems holding the game with, for example, 25.Kc2 and 26.Kb3 and digging in. If 25…Rc4+!? then 26.RxR! bc4 27.b4!? keeps Black busy…
INSTEAD, Ivanchuk played
25.Kc3?

A serious error that gives Black a chance to get a BIG edge
WHAT DID IVANCHUK OVERLOOK?
———————————-