Author: Robin Smith
Date: 12:33:10 08/08/04
Go up one level in this thread
On August 08, 2004 at 02:36:08, Albert Silver wrote: >>On August 07, 2004 at 16:49:52, Robin Smith wrote: >>>Nice analysis Uri. Only one problem. How does White win in the final position of >>>the main line, after 10...Rxe8? I think Black can set up a fairly easy fortress >>>draw. I see no way for White to make progress in the queen versus rook and >>>knight ending. Black will leave the knight on f6, and the king will go to h7, >>>guarding the g-pawn while avoiding checks from the queenside. Black's king-side >>>is totally secure. > >I disagree. I haven't necessarily analyzed to a 1-0, but I can break the >fortress in any case. Bringing the king to c3 is completely useless as you have >shown. I think the strategy is simply that of 'two weaknesses'. Black can't >protect the king AND the queenside pawns all at the same time. At least, it >isn't clear to me how. > >Bring the white king to the kingside, and with the queen threaten to bring the >white king to mate threatening proximity (g6 for example). Black cannot simply >stay put, and this should allow white to win. An example might be (following >your initial line for a bit): > >11.Kb1 b3 12.axb3 axb3 13.Qf2 Rb8 14.Qe1 Kh7 15.Qc3 Rb6 16.Kc1 Rb7 17.Kd2 Rb6 >18.Qc5 Rb8 19.Qd6 Rb5 20.Ke3 (here is where I deviate) Kg6 21.Kf4 Rb7 22.Qa6 Rb8 >23.Qd3+ Kf7 24.Kg5 Rb7 25.Qa6 (now the Black rook is overloaded and has to cover >both the 7th *and* protect the pawns) Re7 26.Qb5 Re3 27.Qb7+ Re7 28.Qxb3... >There's a lot of work to do still, but now White also has the b-pawn as >leverage. > > Albert Hi Albert, You are probably right. I had not looked at it closly enough. But neither do I see how White can break the fortress without White giving up something in return. I am pretty sure Black's king needs to stay on or near the h-file, to avoid queen checks from the side, as I mentioned in my 1st post. Thus in your analysis, after 11.Kb1 b3 12.axb3 axb3 13.Qf2 Rb8 14.Qe1 Kh7 15.Qc3 Rb6 16.Kc1 Rb7 17.Kd2 Rb6 18.Qc5 Rb8 19.Qd6 Rb5 20.Ke3 (which I agree is a much better try for White) 20...Kg6 21.Kf4 Rb7 22.Qa6 Rb8 23.Qd3+ here I think your 23...Kf7 is a mistake, allowing the queen to threaten to fork the king and rook from the queenside, and thus winning the b-pawn outright. However are your sure White can win after 23...Kh6!? White is probably still winning, but it is not 100% clear to me. How would you continue the analysis after 23...Kh6. The only lines I have found where White can win the b-pawn involve Black winning the d or f-pawn in return, when things get a little messy. -Robin
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