Author: John Merlino
Date: 13:03:18 02/27/01
Go up one level in this thread
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
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