Author: Len Eisner
Date: 21:58:38 03/03/00
Go up one level in this thread
On March 04, 2000 at 00:46:38, Len Eisner wrote: >On March 03, 2000 at 20:25:37, Paulo Soares wrote: > >>On March 03, 2000 at 15:44:14, José Antônio Fabiano Mendes wrote: >> >>>On March 02, 2000 at 23:28:15, Paulo Soares wrote: >>> >>>>On March 02, 2000 at 18:30:52, Len Eisner wrote: >>>> >>>>>On March 02, 2000 at 14:16:04, Paulo Soares wrote: >>>>> >>>>>>On March 01, 2000 at 22:35:33, Len Eisner wrote: >>>>>> >>>>>>>[D]6bk/8/7P/p7/1p1R4/r2B1PP1/6K1/8 b - - 0 45 >>>>>>> >>>>>>>Junior 6 played Rxd3! against Hiarcs 7.32 in a 5/3 blitz game on my PIII 500. >>>>>>>It’s a nice exchange sac that wins by force by queening one of the passed pawns. >>>>>>> >>>>>>>Len >>>>>> >>>>>>I didn't get to find a winner line for black. Below a possible >>>>>>variant(the best?): >>>>>> >>>>>>1... Rxd3 2. Rxd3 b3 3. h7 Bc4 4. Rd4 a4 5. Rxc4 >>>>>>a3 6. Rb4 a2 7. Rxb3 a1=Q 8. Re3 Kxh7 9. Kf2 >>>>>> >>>>>>Paulo Soares, from Brazil >>>>> >>>>>In the game Junior 6 played Kxh7 instead of Bc4 in your line. Here’s how it >>>>>went from the position in the diagram: >>>>> >>>>>1...Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bh7 6. Ra6+ Kg7 7. Rb6 Bc2 8. >>>>>Rb7+ Kf6 9. Rb6+ Ke7 10. Rb7+ Kd6 11. Kf2 a4 12. Ke3 a3 13. Kd2 a2 14. Ra7 b2 >>>>>15. Rxa2 b1Q 16. Rxc2 Qg1 17. Rc3 Qxg3 and black wins. >>>>> >>>>>I guess it’s possible for white to save the game, but I don’t see how. >>>>> >>>>>Len >>>> >>>>I believe that, following the line of the game, 6. Rxa5 are better than 6. Ra6+. >>>>All the analyses were made with the help of a program. >>>> >>>>1... Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bh7 6. Rxa5 >>>>Bd3 (6... b2 7. Rb5=) 7. Ra3 b2 8. Rb3 b1=Q 9. Rxb1 Bxb1= >>>> >>>>Paulo Soares >>> >>>Instead of 5...Bh7,Black should play 5...Bc4.Now White can neither >>>take the a-pawn[6.Rxa5 b2] nor check the Black king.Most likely >>>Black has a win here. JAFM >> >>I believe that, same having other interesting variants, >>white draw after 5... Bc4 6. Rb7. >> >>1... Rxd3 2. Rxd3 b3 3. h7 Kxh7 4. Rd7+ Kh6 5. Ra7 Bc4 6. Rb7 a4 7. >>Rb4 a3 8. Rxc4 a2 9. Ra4 b2 10. Rxa2 b1=Q 11. Re2 >> >>The position now is similar to the final position of the first variant >>that I placed (message 99888) and I don't know as black can win. >> >>Paulo Soares. > >Good analysis by both of you. For continuity, here’s a diagram of the final >position in the above line. > >[D]8/8/7k/8/8/5PP1/4R1K1/1q6 b - - 0 54 > >I agree this position is drawn. As an experiment, I removed the white pawns one >at a time to get into the 5-piece tablebase. Interestingly, if you remove the f >pawn the position is drawn, but if you remove the g pawn, it’s mate in 60! > >Anyway, I think black may have some winning chances by playing 8…b2 instead of >8…a2 as in the above line. By pushing the b pawn, I think black makes it harder >for white to sac the rook in a way that draws. > >I’m currently analyzing the position after b2 with Junior 6. > >Len Oops. I meant to say that by pusing the b pawn it makes it harder for white to capture one of the black pawns in a way that draws. Len
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