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Bent Larsen vs Roman Hernandez Onna
GMA Baleares Open (1989), Palma de Mallorca ESP, rd 4, Dec-09
Queen's Gambit Declined: Tarrasch Defense. Pseudo-Tarrasch (D30)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Dec-26-05  notyetagm: Larsen tries to be cute and kill two birds with one stone. By playing 21 h3??, Larsen tries to block the Black h6-queen from reaching the h2-square while at the same time driving that annoying Black g4-knight back from its advanced post.

What's the problem? The Black g4-knight has a forking square on f2 from which it would attack the undefended White d3-queen. <Since the White king defends the f2 forking square, he cannot also defend the h3 target square.> Hence the h3-pawn is not defended at all and Black plays the winning 21 ... ♕xh3+!. The point is that 22 ♔xh3 deflects the king from defending the f2 forking square and decoys him to the h3 target square so that Black can then play 22 ... ♘xf2+ 23 ♔g2 ♘xd3. Black is then two pawns ahead with the queens off and going to win an exchange as well.

Larsen should have played 21 h4 to meet the threat to the h2-square but like I said he wanted to simultaneously drive the knight out of g4.

Dec-26-05  MaxxLange: That's quite a blunder for a GM. Most B players would see that shot.
Dec-26-05  notyetagm: <MaxxLange> Agreed. I saw it instantly myself, but it was a puzzle book so I knew there was some tactical point in the position. For a GM that move is definitely 21 h3??.
Dec-26-05  MaxxLange: The worst GM blunder I know of is still Christiansen vs Karpov, 1993
Dec-26-05  Benzol: <MaxxLange> How about missing a mate in one. See Black's 38th move in this game A Matanovic vs O Sarapu, 1967 Fortunately it only cost him a half point.
Dec-26-05  MaxxLange: Well, that does sound worse, yes.
Dec-26-05  tiburon92: the black knight would have taken a pawn on the fork of the king and queen, taken the queen then forked the rooks. That was a great shot.
Jun-30-11  notyetagm: Game Collection: KNIGHT FORKS!

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