Author: Sune Larsson
Date: 13:42:54 02/27/01
Go up one level in this thread
On February 27, 2001 at 16:03:18, John Merlino wrote: >On February 27, 2001 at 15:37:03, Sune Larsson wrote: > >> >> [D]8/6k1/2p5/pp2p3/4P1K1/2PP4/P7/8 b - - 0 1 >> >> This is Damjanovic-Dvorecki, Vilnius 1978. Mistakes in the endgame are >> punished severely. Here black is on the move and has to decide if he >> wants to lose with 1.-c5??, thinks peace and draw is good enough with 1.-Kf6?, >> or goes for the whole cheese with 1.-Kg6! Oh, this is just tiresome >> calculation. No match for Kasparov, I guess. Computers? >> >> The game went like this: >> >> 1.-Kg6! [1.-c5?? 2.Kf5 b4 3.cxb4 cxb4 4.Kxe5 a4 5.Kd4+-] >> [1.-Kf6? 2.Kf3 c5 3.Ke3 b4 4.d4! cxd4+ 5.cxd4 a4 6.dxe5+ Kxe5 7.Kd3=] >> >> 2.Kf3 [2.d4 exd4 3.cxd4 b4-+] 2.-c5 3.Ke3 [3.d4 cxd4 4.cxd4 b4! 5.Ke3 a4-+] >> 3.-b4 4.d4 [4.cxb4 cxb4 5.Kd2 a4! 6.Kc2 Kg5 7.Kd2 Kf4-+] >> 4.-cxd4+ 5.cxd4 a4! 6.Kd3 b3 7.axb3 a3 8.Kc2 exd4 9.b4 d3+ 0-1 >> >> Test: 1.-c5?? loses. If you are a programmer please rewrite your program >> totally from scratch. If you are a consumer just >> throw the damned thing. ;) >> >> 1.-Kf6? draws. Ok, peaceful mind - but you just missed some glory. >> Programmers: Have a look at the evals - the right move >> was just around the corner. >> >> 1.-Kg6! wins. Congrats! This is good stuff. Just hope the margin >> to 1.-Kf6? was more than 0.02... >> >> Sune > >I'm not so sure about this one. CM8000 sees 1...Kf6 as a win, as it would play >3...a4! instead of 3...b4 (as in your line above): > >Time Depth Score Positions Moves >0:00 7/8 0.58 10424 1...Kg6 2. d4 exd4 3. cxd4 Kf6 > 4. e5+ Ke7 5. Kg5 b4 6. Kf5 a4 >0:00 9/10 -0.43 61408 1...Kf6 2. Kf3 c5 3. Ke3 Ke6 4. > Kf3 b4 5. cxb4 cxb4 6. Ke3 a4 >0:00 10/11 -0.32 106547 1...Kf6 2. Kf3 Ke6 3. Ke3 b4 4. > cxb4 axb4 5. Kf3 c5 6. Ke2 Kd6 > 7. Ke3 >0:01 11/12 -0.43 192099 1...Kf6 2. Kf3 Ke6 3. Ke3 c5 4. > Kf3 Kd6 5. Ke2 b4 6. cxb4 cxb4 > 7. Ke3 a4 >0:02 12/13 -0.53 378998 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 b4 5. Kc2 Kg5 6. Kd2 Kf4 7. > Kc2 Ke3 >0:04 13/14 -0.61 604989 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > d4 exd4+ 5. cxd4 c4 6. Kf4 c3 7. > Ke3 b4 8. Kd3 Ke6 >0:07 14/15 -0.67 1011338 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > d4 exd4+ 5. cxd4 c4 6. Kd2 b4 7. > Kd1 Ke6 8. Kc2 b3+ 9. Kb2 bxa2 > 10. d5+ Kd6 11. Kxa2 >0:13 15/16 -0.98 1744296 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 b4 5. Kc2 Kg5 6. cxb4 cxb4 > 7. Kc1 Kf4 8. Kd2 b3 9. axb3 axb3 > 10. Kc3 >0:21 16/17 -0.99 2823338 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 b4 5. Kc2 Kg5 6. cxb4 cxb4 > 7. Kc1 Kf4 8. Kd2 a3 9. Kc1 Ke3 > 10. Kc2 Kd4 >0:39 17/18 -0.99 4886592 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 b4 5. Kc2 Kg5 6. cxb4 cxb4 > 7. Kc1 Kf4 8. Kd2 Kf3 9. Kc1 Ke3 > 10. Kc2 Kd4 >1:21 18/19 -1.92 9517380 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 a3 5. Kc2 Kg5 6. Kb3 Kf4 7. > Kxa3 Ke3 8. d4 exd4 9. e5 dxc3 > 10. Kb3 Kd2 11. e6 >4:11 19/20 -2.84 26611495 1...Kf6 2. Kf3 c5 3. Ke3 a4 4. > Kd2 b4 5. Kc2 Kg5 6. Kc1 Kf4 7. > Kd2 b3 8. axb3 axb3 9. c4 b2 10. > Kc2 Ke3 11. Kxb2 Kxd3 12. Kc1 Kxe4 > >Also, here's what it sees after 3...b4 4.d4, from your 1...Kf6? line above (note >4...exd4+ rather than 4...cxd4+, which IS a draw): > >Time Depth Score Positions Moves >0:00 7/8 -0.67 22773 4...c4 5. Kd2 b3 6. Kc1 exd4 7. > cxd4 bxa2 8. Kb2 Ke7 9. Kxa2 c3 >0:00 8/9 -0.74 53183 4...c4 5. Kd2 b3 6. Kc1 exd4 7. > cxd4 Ke6 8. axb3 cxb3 9. Kb2 a4 >0:01 9/10 -0.50 116802 4...c4 5. cxb4 axb4 6. d5 Ke7 7. > Ke2 Kd6 8. Kd2 c3+ 9. Kd3 Kc5 10. > Kc2 >0:01 9/10 -1.42 150625 4...exd4+ 5. cxd4 a4 6. dxc5 b3 > 7. axb3 a3 8. c6 Ke6 9. c7 Kd7 > 10. Kd4 a2 >0:02 10/11 -3.09 301015 4...exd4+ 5. cxd4 a4 6. Kd3 b3 > 7. axb3 a3 8. Kc2 cxd4 9. Kc1 Ke5 > 10. b4 Kxe4 >0:03 11/12 -3.08 446245 4...exd4+ 5. cxd4 a4 6. Kd3 b3 > 7. axb3 a3 8. e5+ Ke6 9. d5+ Kxe5 > 10. Kc2 Kxd5 11. Kb1 Kd4 12. Ka2 >0:06 12/13 -4.22 774563 4...exd4+ 5. cxd4 a4 6. Kd3 b3 > 7. axb3 a3 8. e5+ Ke7 9. Kc2 cxd4 > 10. Kc1 a2 11. Kb2 d3 12. b4 a1=Q+ > 13. Kxa1 >0:12 13/14 -6.64 1418541 4...exd4+ 5. cxd4 a4 6. dxc5 b3 > 7. axb3 a3 8. c6 Ke6 9. Kd3 a2 > 10. Kc4 a1=Q 11. b4 Kd6 12. Kb5 > Qe5+ 13. Kb6 Qxe4 >0:19 14/15 -6.98 2235356 4...exd4+ 5. cxd4 a4 6. dxc5 b3 > 7. axb3 a3 8. c6 Ke6 9. Kd3 a2 > 10. Kc4 a1=Q 11. b4 Kd6 12. Kb5 > Qe5+ 13. Kb6 Qd4+ 14. Kb5 Qxe4 >0:58 15/16 -7.72 6315957 4...exd4+ 5. cxd4 a4 6. e5+ Ke7 > 7. Kd3 b3 8. axb3 a3 9. dxc5 a2 > 10. Kc4 a1=Q 11. Kb5 Qxe5 12. b4 > Kd7 13. Ka6 Kc6 > >The results are very similar if White responds to 4.d4 to 3...a4, rather than >3...b4. > >But, at least we all agree that 1...c5?? loses! ;-): > >Time Depth Score Positions Moves >0:00 7/8 3.87 11148 2. Kf5 Kf7 3. Kxe5 c4 4. dxc4 bxc4 > 5. Kd5 Ke7 6. Kxc4 Kd6 >0:00 10/11 3.82 68824 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 b3 6. axb3 axb3 7. Kc3 Kf6 > 8. Kxb3 Ke5 >0:01 11/12 4.08 128116 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 Kf6 6. Kc4 b3 7. axb3 axb3 > 8. Kxb3 Ke5 9. Kc4 >0:01 12/13 4.37 212689 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 b3 6. axb3 axb3 7. Kc3 b2 > 8. Kxb2 Kf6 9. Kc3 Ke6 10. Kd4 >0:02 13/14 3.15 375757 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 Kf7 6. Kc4 b3 7. axb3 a3 > 8. Kc3 Ke8 9. d4 a2 >0:05 14/15 3.14 668868 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 Kf7 6. Kc4 b3 7. axb3 a3 > 8. Kc3 Ke8 9. d4 a2 10. Kb2 >0:09 15/16 3.10 1234305 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 Kf6 6. Kc4 b3 7. axb3 a3 > 8. Kc3 Ke5 9. b4 Kd6 10. Kb3 >0:22 16/17 5.08 2802226 2. Kf5 a4 3. Kxe5 b4 4. cxb4 cxb4 > 5. Kd4 Kf6 6. Kc4 b3 7. axb3 axb3 > 8. Kxb3 Ke5 9. Kc4 Ke6 10. d4 Kf7 > 11. e5 Ke7 12. d5 > >jm Oops, looks like GM Dvorecki has made some mistakes in his comments... The variations I added were strictly his and at first glance they looked okey. But I cannot refute CM:s analysis at this stage. Looks like 1.-Kf6 also wins, given the moves of CM. Fantastic! But then, these pawn endings are tricky and maybe some talent around here can find something new?! Sune
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