Author: Frank E. Oldham
Date: 19:31:13 06/15/04
Go up one level in this thread
On June 14, 2004 at 16:31:17, Jaime Benito de Valle Ruiz wrote:
>[d]8/8/1p4p1/p5kp/Pp1QP1Pq/1P6/6K1/8 w - - 0 62
>
>White moves and wins!
>Can your engine find the right answer and give the proper "crushing" score
>(around 9 pawns!) along with a proper PV? How long does it take?
>Mine doesn't find anything after a long long time (over an hour), but with
>null-move disabled, it takes only a few seconds to show the full PV.
>(Some engines find the right answer, but with a small score, an absurd PV, and
>they change their mind some plies later)
>
>In this position the black king is in a very delicate position: After a couple
>of moves, if the black queen moves, white checkmates inmediately, so both kings
>and queens must remain still while pawns play on their own.
>
>Any good suggestion to avoid this problem with null-move?
>
>Regards,
>
> Jaime
no problem for crafty19.10 -- just a few secs andn the eval jumps 7 pts :-)
10-> 0.85 -0.91 1. gxh5 Qg4+ 2. Kf2 Qf4+ 3. Kg1 gxh5
4. Qxb6 Qg3+ 5. Kh1 Qe5 6. Qe3+ Kg6
7. Qb6+ Kf7 8. Qe3 (s=2)
11 1.99 -1.01 1. gxh5 Qg4+ 2. Kf2 Qf4+ 3. Ke2 gxh5
4. Qd5+ Kg6 5. Qc6+ Qf6 6. Qe8+ Kg5
7. e5 Qg7 8. Kd3 h4
11 3.21 ++ 1. Qd2+!!
11 3.44 6.06 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 a3 5. Qf3+ Kg5 6. b7 Qe1 7. b8=Q
Qd2+ 8. Qf2 Qxf2+ 9. Kxf2
11-> 3.44 6.06 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 a3 5. Qf3+ Kg5 6. b7 Qe1 7. b8=Q
Qd2+ 8. Qf2 Qxf2+ 9. Kxf2 (s=3)
12 3.46 ++ 1. Qd2+!!
12 3.59 7.94 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. b8=Q Qh1+ 7. Kxh1
b1=Q+ 8. Qg1+ Qxg1+ 9. Kxg1 g5 10.
Kh2 h4 11. Qxb4 (s=2)
12-> 3.68 7.94 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. b8=Q Qh1+ 7. Kxh1
b1=Q+ 8. Qg1+ Qxg1+ 9. Kxg1 g5 10.
Kh2 h4 11. Qxb4
13 3.71 ++ 1. Qd2+!!
13-> 3.95 8.33 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. b8=Q Qh1+ 7. Kxh1
b1=Q+ 8. Qg1+ Qxg1+ 9. Kxg1 g5 10.
Kh2 h4 11. Qxb4 (s=2)
14 4.23 8.26 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. b8=Q Qh1+ 7. Kxh1
b1=Q+ 8. Qg1+ Qxg1+ 9. Kxg1 h4 10.
Qxb4 h3 11. e5+ Kf5 12. Kh2
14-> 4.50 8.26 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. b8=Q Qh1+ 7. Kxh1
b1=Q+ 8. Qg1+ Qxg1+ 9. Kxg1 h4 10.
Qxb4 h3 11. e5+ Kf5 12. Kh2 (s=2)
15 4.97 8.62 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. Qf3+ Kg5 7. b8=Q
Qh1+ 8. Kxh1 b1=Q+ 9. Kh2 Qb2+ 10.
Qg2+ Qxg2+ 11. Kxg2 b3 12. Kh3 Kf6
13. Qxb3
15-> 5.34 8.62 1. Qd2+ Kxg4 2. Qe3 b5 3. axb5 a4 4.
b6 axb3 5. b7 b2 6. Qf3+ Kg5 7. b8=Q
Qh1+ 8. Kxh1 b1=Q+ 9. Kh2 Qb2+ 10.
Qg2+ Qxg2+ 11. Kxg2 b3 12. Kh3 Kf6
13. Qxb3
16 5.70 ++ 1. Qd2+!!
16 1:08 17.07 1. Qd2+ Kxg4 2. Qe3 Qh3+ 3. Qxh3+ Kf4
4. Qe6 Ke3 5. Qxg6 Kd3 6. e5+ Kc3 7.
Qg3+ Kb2 8. e6 h4 9. Qe3 Ka3 10. Qxb6
Kxb3 11. Qxa5 Kc4 12. e7 <HT>
16-> 1:08 17.07 1. Qd2+ Kxg4 2. Qe3 Qh3+ 3. Qxh3+ Kf4
4. Qe6 Ke3 5. Qxg6 Kd3 6. e5+ Kc3 7.
Qg3+ Kb2 8. e6 h4 9. Qe3 Ka3 10. Qxb6
Kxb3 11. Qxa5 Kc4 12. e7 <HT>
17 1:11 ++ 1. Qd2+!!
17-> 1:29 17.46 1. Qd2+ Kxg4 2. Qe3 Qh3+ 3. Qxh3+ Kf4
4. Qe6 Ke3 5. Qxg6 Kd3 6. e5+ Kc3 7.
Qg3+ Kb2 8. e6 h4 9. Qe3 Ka3 10. Qxb6
Kxb3 11. Qxa5 Kc4 12. e7 <HT>
18 1:39 ++ 1. Qd2+!!
18-> 3:52 17.85 1. Qd2+ Kxg4 2. Qe3 Qh3+ 3. Qxh3+ Kf4
4. Qe6 Ke3 5. Qxg6 Kd3 6. e5+ Kc3 7.
Qg3+ Kb2 8. e6 h4 9. Qe3 Ka3 10. Qxb6
Kxb3 11. Qxa5 Kc4 12. e7 <HT>
19 4:03 -- 1. Qd2+
19 8:16 ++ 1. Qd2+!!
White(1): ?
time=262:03 cpu=396% mat=-1 n=47835764637 fh=99% nps=3.04M
ext-> chk=852526250 cap=5273571 pp=16468304 1rep=754220050
mate=302166
predicted=0 nodes=47835764637 evals=564502499
endgame tablebase-> probes=0 hits=0
SMP-> split=11199 stop=920 data=12/32 cpu=1038:49 elap=262:03
Frank
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