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Jesper Norgaard
04-08-2009, 05:33 PM
I am Black against WIM Yadira Hernandez (Mexico's strongest female chess player, who happens to be married to IM Rafael Espinosa, one of the strongest male chess players in Mexico), in a strong local tournament in Chapingo from 2008 (just 15 km from where I work). Can you find my refutation of 17.Ng3?

1rbqr1k1/2n2pbp/p2p2p1/1ppP4/P3PPn1/R4BN1/1P1N2PP/2BQ1R1K b - - 0 17

MichaelBaron
04-08-2009, 05:45 PM
Yes i can :).

Axiom
04-08-2009, 05:45 PM
17...Nxh2 18.Kxh2 Qh4+

Jesper Norgaard
04-08-2009, 05:56 PM
Yes i can :).
Funny guy :lol:

Jesper Norgaard
04-08-2009, 06:06 PM
17...Nxh2 18.Kxh2 Qh4+

Quite right Axiom and not too difficult to see - I think Yadira had a bit of a blackout there.
17...Nxh2 18.Kxh2 Qh4+ 19.Kg1 Bd4+! must not forget to win the exchange in passing 20.Rf2 Qxg3 21.Qf1 White is already totally lost. Can you find the combinational motif that won me another pawn from here?

Axiom
04-08-2009, 06:23 PM
Nxd5 with threat of Re1 if exd5, after exchange on f2

Jesper Norgaard
05-08-2009, 01:20 AM
Nxd5 with threat of Re1 if exd5, after exchange on f2
Exactly. Funny my box doesn't even consider Nxd5 but I guess Hartstons formula for evaluating if a combination is potentially sound (you still have to calculate correctly) is something like expected win of material (1) divided by number of moves that it will take (in this case 5) and so the computer prefers other moves here when Black has already 1 pawn and exchange extra.

The rest of the game follows here

17...Nxh2 18.Kxh2 Qh4+ 19.Kg1 Bd4+ 20.Rf2 Qxg3 21.Qf1 Nxd5!? 22.e5? {Yadira discarded 22.exd5 Bxf2+ 23.Qxf2 Re1+ 24.Nf1 Qxf2+ 25.Kxf2 Rxc1 -+ and continues in harakiri style} 22...Nxf4 23.Bg4 clearly fishing for Rxg3 - as Wesley Snipes said to the airplane hijacker in the film, advice: put all your money on Black! 23...Qxg4 24.Ne4 fishing for Nf6+ 24...Nh3+ 25.Kh2 Qxe4 0-1