Author: John Merlino
Date: 12:35:03 11/13/02
Go up one level in this thread
On November 13, 2002 at 14:53:26, José Antônio Fabiano Mendes wrote: > http://www.chesscafe.com/Dvoretsky/dvoretsky.htm >Endgame Training: >Expert Use of the Rooks > >I invite readers to solve the following rook endgames (allow an hour >to an hour and a half for all six positions). Only the first few >examples will be simple (although even there, it will not be hard to >go wrong); after that, your task will become more and more difficult. >Don’t be unhappy if there are some positions you just can’t solve. >Serious consideration of these problems, followed by a comparison >of your ideas with the answers (which are, in my opinion, both >interesting and pretty) will undoubtedly be to your benefit. >============================================================ >Diagram 1 shows a very interesting and well-known study by >G. Nadareishvili, 1961. [to be solved without tablebases, of course] > [D]8/K5p1/8/8/7p/7k/8/6R1 w >1 Rg5!! >Black is playing for stalemate. In order to gain time for the king to >approach, White must prevent the g-pawn from advancing two >squares. That is why 1 Kb6? g5!= is inaccurate. >1...Kh2 2 Kb6 h3 3 Kc5 Kh1 4 Kd4 h2 5 Ke3 g6 6 Rg3 g5 >7 Kf2 g4 8 Ra3 g3+ 9 Kxg3 Kg1 10 Ra1# Chessmaster 9000, on a P4-2.66 without tablebases, announces the correct mate in 11 with Rg5 in 28 seconds. It finds Rg5 in one second. Also, according to tablebases, it is not a Mate in 10 as described above, as 4...h2 is the worst of the three possible moves. 4...g6 and 4...Kh2 both make the mating sequence one move longer than 4...h2: Time Depth Score Positions Moves 0:00 5/9 0.32 67800 1.Kb6 Kh2 2.Rxg7 h3 3.Re7 Kg1 4.Re1+ Kf2 5.Rc1 Kg2 0:00 6/10 0.38 187220 1.Kb6 Kh2 2.Rxg7 h3 3.Kc5 Kh1 4.Rd7 Kg1 5.Rd1+ Kf2 6.Kd4 Kg2 7.Ke4 0:00 7/11 0.36 456280 1.Kb6 g5 2.Rxg5 Kh2 3.Rg7 h3 4.Kc5 Kh1 5.Rd7 Kg1 6.Rd1+ Kf2 7.Rb1 Kg3 8.Rg1+ Kf3 0:01 7/11 1.26 748210 1.Rg5 g6 2.Kb6 Kh2 3.Kc5 h3 4.Kd4 Kh1 5.Rg3 h2 6.Ke3 g5 7.Kf2 g4 8.Re3 0:01 8/12 1.92 805181 1.Rg5 g6 2.Kb6 Kh2 3.Kc5 h3 4.Kd4 Kh1 5.Rg3 Kh2 6.Rg4 Kh1 7.Ke4 h2 8.Kf3 0:01 9/13 1.92 1224160 1.Rg5 g6 2.Kb6 Kh2 3.Kc5 h3 4.Kd4 Kh1 5.Rg3 Kh2 6.Rg4 Kh1 7.Ke4 h2 8.Kf3 0:02 10/14 3.01 1829916 1.Rg5 g6 2.Kb6 Kh2 3.Kc5 h3 4.Kd4 Kh1 5.Rg3 Kh2 6.Rg4 Kh1 7.Ke4 h2 8.Kf4 g5+ 9.Kg3 Kg1 10.Kh3+ Kh1 11.Rxg5 0:04 11/15 3.09 2964555 1.Rg5 Kh2 2.Kb6 h3 3.Kc5 Kh1 4.Kd4 Kh2 5.Rg6 Kh1 6.Ke3 Kh2 7.Kf3 Kh1 8.Rxg7 h2 9.Re7 0:05 12/16 3.65 3915797 1.Rg5 Kh2 2.Kb6 h3 3.Kc5 Kh1 4.Kd4 g6 5.Ke3 Kh2 6.Rxg6 Kh1 7.Kf3 Kh2 8.Re6 Kg1 9.Re1+ Kh2 0:07 13/17 5.45 5311861 1.Rg5 Kh2 2.Kb6 h3 3.Kc5 Kh1 4.Kd4 g6 5.Ke3 Kh2 6.Rxg6 Kh1 7.Kf3 Kh2 8.Re6 Kg1 9.Kg3 Kf1 10.Kxh3 0:11 14/18 5.48 7955311 1.Rg5 Kh2 2.Kb6 Kh1 3.Kc5 Kh2 4.Kd4 Kh1 5.Ke4 Kh2 6.Rxg7 Kh3 7.Kf4 Kh2 8.Rh7 Kh3 9.Kg5 Kg2 10.Rxh4 Kg3 0:16 15/19 5.62 10763355 1.Rg5 Kh2 2.Kb6 Kh1 3.Kc5 Kh2 4.Kd4 Kh1 5.Ke4 Kh2 6.Rxg7 Kh3 7.Kf4 Kh2 8.Rg4 Kh3 9.Kg5 Kh2 10.Kxh4 Kh1 11.Kg5 Kh2 12.Kf5 Kh3 0:21 16/20 5.64 14500513 1.Rg5 Kh2 2.Kb6 Kh1 3.Kc5 Kh2 4.Kd4 Kh1 5.Ke4 Kh2 6.Rxg7 Kh3 7.Kf4 Kh2 8.Rg4 Kh3 9.Kg5 Kh2 10.Kxh4 Kh1 11.Kg5 Kh2 12.Kf4 Kh3 13.Rg6 0:28 17/21 Mate11 19280385 1.Rg5 Kh2 2.Kb6 Kh1 3.Kc5 Kh2 4.Kd4 Kh1 5.Ke3 h3 6.Kf2 g6 7.Rg1+ Kh2 8.Rxg6 Kh1 9.Rg1+ Kh2 10.Rg3 Kh1 11.Rxh3# jm
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.