Author: irawan
Date: 00:29:40 02/06/02
Go up one level in this thread
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. 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
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.