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John Nunn vs Lajos Portisch
Budapest Interzonal Playoff (1987), Budapest HUN, rd 2, Sep-27
Spanish Game: Berlin Defense (C65)  ·  0-1



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Kibitzer's Corner
Jan-12-13  IndigoViolet: The closest Nunn ever came to becoming world champion. It's the second game of a six-game playoff match with Portisch, following the Szirak Interzonal, to decide who continues on to the Candidates matches. He's lost Game 1, but with 21.Qg5!! he can overrun Black's weakened dark squares and level the match....

Significantly, perhaps, when they repeated this line in Game 4, Portisch played 12...c5 instead of ...g6.

When annotated, however, in the December 1987 <CHESS>, 20...Rd8 is given !, when it should be ??. <20...Rxe5 21.Bxe5 Bxe5 22.a3 Na6 24.Qa5 Bxe4! 25.Rxe4 Qxb3 26.Rf1 Bf6 27.Qxa6 Qb6 28.Qa4 Bd4> and Black should hold.

Premium Chessgames Member
  offramp: Game 2. The match took place 27/9/1987 to 3/10/1987. Portisch was leading 1-0.

click for larger view

As IndigoViolet says, 21.Qg5 does seem to be a winning move. The idea is 22.Qe7. Something like this:

click for larger view

Feb-08-17  Straclonoor: <As IndigoViolet says, 21.Qg5 does seem to be a winning move> 21.Qg5 gives serious advantage for white:
Stockfish 8 64 2.81 (depth 31) 21.Qg5
Bxe4 22.Qe7 Rf8 23.Nd7 Qd8 24.Qxb4 Bxb2 25.Nxf8 Qxf8 26.Qxf8+ Kxf8 27.Rxe4 Ba3 28.Rd7 Rc8 29.Rf4 Be7 30.g4 Ke8 31.Rd3 c5 32.Re4 Kf8 33.Rd7 Bd6 34.Re3 Re8 35.Rf3

This endgame looks like won for white

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