Author: Christoph Fieberg
Date: 17:49:35 08/18/00
Go up one level in this thread
On August 17, 2000 at 22:03:32, Uri Blass wrote: >On August 17, 2000 at 20:42:02, Uri Blass wrote: > >>On August 17, 2000 at 19:29:07, Uri Blass wrote: >> >>>On August 17, 2000 at 14:21:30, Christoph Fieberg wrote: >>> >>>>On August 17, 2000 at 13:52:51, Uri Blass wrote: >>>> >>>>>On August 16, 2000 at 06:40:10, Christoph Fieberg wrote: >>>>> >>>>>>>>>1.Lxd2 Sf6+ 2.gxh8S Txh8+ 3.Th7 fxg1D 4.c8D exd1D 5.bxa8D >>>>>> >>>>>>>>I think that this line is not a draw. >>>>>> >>>>>>>>White wins by 5.d8Q+(possible lines 5...Kg3 6.Qd6+ Kf2 7.Qd4+ Kf1 8.Qcc4+ Qe2 >>>>>>>>9.Qxe2+ Kxe2 10.Nxg1+ hxg1 11.Qxg1 or 5...Rxc8 6.bxc8Q+ Kg3 7.Qd6+ Kf2 8.Qcc5+) >>>>>>>> >>>>>>>>Uri >>>>>> >>>>>>I agree that after 4.c8D exd1D 5.d8Q+! (instead of 5.bxa8Q) White will win. >>>>>> >>>>>>But what about the preventive 4....Kg3 (instead of exd1D). Is this also a forced >>>>>>win for White? At the moment I analyse it with Fritz6 (will take some time). >>>>>> >>>>>>Regards, >>>>>>Christoph >>>>> >>>>>I did not analyze the position but only gave it to Junior5.9. >>>>> >>>>>after 4...Kg3 Junior5.9 fails high on the move Rxh8 >>>>> >>>>>evaluation at depth 13(after the typical 0.3 addition for fail high moves) is >>>>>1.03 pawns for white. >>>>> >>>>>I used pentium200MMX for 2 hours to get the evaluation(my pentiumIII450 is busy >>>>>in another task). >>>>> >>>>>Uri >>>> >>>>Hi Uri, >>>>I agree that 4...Kg3 is not sufficient - but in the meantime I found a line >>>>after 1... Ng5+!! which seems to be a forced win for Black! Check this: >>>> >>>>1.... Ng5+!! 2.gxh8Q Rxh8+ 3.Rh7 fxg1Q! 4.e8Q Rxh7+ 5.gxh7 h1Q 6.Bxc2 Kg3+ >>>>7.Kxg5 Qc5+ 8.Qe5+ Qxe5+ 9.Nxe5 Qh4+ 10.Kg6 b1Q 11.c8Q Qb6+ 12.Qc6 Qg4+ 13.Kh6 >>>>a1Q 14.Rxa1 Rxa1 -+ >>> >>>Hi christhophe, >> >>Sorry, should be Christoph(I could copy and paste to avoid the mistake) >>>Junior5.9 agrees that 1...Ng5+ is better. >>> >>>Main line after few hours on p200MMX begins with: >>>1...Ng5+ 2.gxh8Q Rxh8+ 3.Rh7 fxg1Q 4.Bxc2 b1Q 5.c8Q Rxh7+ >>> >>>The evaluation is 2.46 pawns for black at depth 13(1725726 knodes) >>> >>>Uri >> >>Junior falled high at depth 14(2343520 knodes) and is very happy about Ng5 >>evaluation 2.76 pawns for black(the normal +0.3 when Junior fails high). >> >>Junior did not solve the fail high problem and continues to consider Ng5 at >>depth 14. >> >>regards,Uri > >Junior5.9 solved the fail high with score 2.87 pawns for black(3565564 knodes). >The main line was changed and the main line now is >1...Ng5+ 2.gxh8Q Rxh8+ 3.Rh7 Rxh7+ 4.gxh7 Nf7+ 5.Kg7 fxg1Q > >Uri Interesting analysis. Thanks, Uri! Does it mean that 3...fxg1Q is not the best move, but 3...Rxh7+ Is 4.Bxc2 the refutation of 3...fxg1Q? However, the only question remaining is whether there is a better first move for White instead of 1.Bxd2. Grüsse, Christoph
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