In round five he reached the following position as Black against Reinhard Walther (1959).
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| Black to play and win |
*****
*****
*****
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Stef played 1...Rb7, and went on to lose the game.
He relates how he considered 1...Rb1+, but dismissed it as there seemed no decent follow-up after 2.Kh2.
However, engines show Black has a forced mate starting with 2...Nf6!, when 3...Ng4+ is a deadly threat.
White can postpone it with 3.Ne5, but then comes 3...Qxe5!!, eg 4.dxe5 Ng4+ 5.Kh3 Nxf2+ 6.Kh4 Rh1#.
Despite this setback, Stef is having a good tournament, having gained 16.4 elo after seven rounds.
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