Author: Len Eisner
Date: 21:46:38 03/03/00
Go up one level in this thread
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
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