Author: Odd Gunnar Malin
Date: 01:27:13 02/06/02
Go up one level in this thread
On February 06, 2002 at 03:29:40, irawan wrote: >On February 06, 2002 at 01:37:50, Odd Gunnar Malin wrote: > >>On February 05, 2002 at 20:13:49, irawan wrote: >> >>>On February 05, 2002 at 05:18:03, Uri Blass wrote: >>> >>>>On February 05, 2002 at 05:06:15, irawan wrote: >>>> >>>>>Hi all, >>>>> >>>>>What is your engine choice on this position ? >>>>>I got it from Art of Attack in Chess by Vukovic. >>>>> >>>>>[D] r1bq1rk1/pp1n1ppp/1bp1p3/8/3P1B2/2PB1N2/PP3PPP/R2QR1K1 w - - >>>>> >>>>>How many depth needed in order to find Bxh7 ? >>>>> >>>>>irawan >>>> >>>>Your position is wrong >>>> >>>>r1bqrk1 means that there are only 7 squares in one line. >>> >>>Yes Uri, it should be r1bq1rk1. So the rook is placed on f8. >>>Sorry for this typo. >>>I found it is difficult for chess program to sac his bishop on h7. >>> >> >>Is it the best move then? It would most probably lead to a positive score but >>isn't Ng5 or something give at least equal score? > >I don't know the _exact_ answer here. Vukovic explained that some conditions >_must be fulfilled_ before doing this kind sac. >They are including : >* white must have a queen >* the light-squared bishop must be able reach h7, it is not essential that it >should put Black in check or take a pawn in so doing. >* the knight should be within easy and safe reach of square g5, and the queen >within reach of h5 >* the Black knight should not be able to reach f6 and that neither his queen or >bishop sholud be able to occupy the h7-b1 diagonal unharmed. Aha. 4...e5 in your line below follow by 5...Bf5. I should not pretend as I understand this. I struggle with CTArt3 a couple of hours a week so it's just fun. I think I must let Uri come with his long time comp-analysis. Nice combination anyway, much to analyze on Blacks's 4'th and 5'th move. Odd Gunnar >Unfortunately these rule are easier to say than to practice. As usual, there are >many exception. >From my point of view, Ng5 adds some pressure on Black king side. >Nothing sure from Ng5. However White position is good already. > >>For the classical Bxh7 there is missing the thematic pawn on e5 allow Nf6 as a >>defence move. > >No, once the knight _safely_ come to f6 then the attack fail. >In my post, the missing e5 is fully compensated by the dark-squared bishop. >Below is Vukovic analysis : >1.Bx7+ Kxh7 2.Ng5+ Kg8 3.Qh5 Nf6 4.Qh4 Re8 5.Be5 Qe7 6.Re3 Bd8 7.Rh3 +-. >As shown above, on 5-th move White uses his bishop in order to drive the >_powerful_ knight on f6 out. > > >> >>Odd Gunnar
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