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Subject: Re: Rybka's underpromotion bug prevents it to win easily!!!!!

Author: George Tsavdaris

Date: 10:39:37 02/26/06

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On February 26, 2006 at 13:36:03, George Tsavdaris wrote:

>On February 26, 2006 at 13:24:04, Peter Skinner wrote:
>
> In this position Rybka didn't play Qf4 winning easily but instead it went to a
>rather unclear endgame with Qh3? .
>[D]r2B2k1/2p2ppp/8/4Pq2/8/N1P2p2/1PB4P/3Q2bK b - - 0 24
>
>The underpromotion is a factor as i said because Rybka can't see that after
>24...Qf4 25.Kxg1 Qg4+ 26.Kf2 Qg2+ 27.Ke3 f2 28.Qd7 black has f1N+ winning!

Of course after 27...f2 the best defense for white is:
28. Bxh7+ Kf8 29. Qd4 f1N+ 30. Kd3 Qd2+ 31. Kc4 Ne3+ 32. Kc5 Rxd8 33. Qxd2 Rxd2
34. Be4 Rxb2 -+ which is losing for white easily.....




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