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Aleksey Dreev vs Lajos Portisch
Zurich Chess Club 200th Anniversary (2009), Zuerich SUI, rd 3, Aug-10
Queen's Gambit Declined: Semi-Tarrasch Defense. Exchange Variation (D41)  ·  1-0

8
7
6
5
4
3
2
a
1
b
c
d
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f
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h
White to move.
ANALYSIS [x]
1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

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Kibitzer's Corner
Aug-15-09  tibone: maybe Rxd1+ was a mistake? maybe 21...Rad8 22.Rxd6 Rxd6 23.Nxc5 bxc5 is better because unlike in the game continuation black has the d-file and not white.
Dec-17-23
Premium Chessgames Member
  FSR: Repertoire Explorer: Lajos Portisch (black) shows that this is the only game in the database that Portisch lost when facing 6.e4 in the Semi-Tarrasch. It wasn't the fault of the opening. Surya Shekhar Ganguly writes in his Chessable course on the Nimzo-Indian and Semi-Tarrasch that after 16...Rd8 "Black gets a lovely endgame where both White's minor pieces are restricted. The engines already slightly prefer Black's position." Stockfish 16 gives 16...Rd8 17. Rad1 Kf8 18. h4 Bb7 19. dxe6 Rxd1 20. Rxd1 fxe6 21. Nd4 Ke7 22. f3 a6=. ChessBase Online shows that despite Dreev's success here, no one has played 15.Qxf6 since.

Where did Portisch go wrong? His major mistake was 35...Bb7?, allowing Dreev to infiltrate with 36.Ra7! Kb6 37.Ra3! Rxh4 38.Rd3! Bc6 39.Rd8! Instead, 35...Kb7! 36.Ra5 (36.Bc8+ Kc7 37.Be6 Kb7!) Kb6 37.Ra3 Rxh4 38.Rd3 Kc7 would have kept out White's rook and held the draw. Most likely Portisch was in time pressure and failed to appreciate the subtle difference between 35...Kb7! and 35...Bb7?, which unguarded d7.

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