Ivanchuk in Istanbul
The first player has sacrificed a piece to invade with his rook on the 7th rank, but the calm 24.Raf1 in the diagram position would allow the excuse 24...Qxg2+. The alternative 24.gxh7+ Kxf7 leads to ...
A) ... a white victory by force
B) ... perpetual check
C) ... a winning position for Black
Solution
