Author: Slater Wold
Date: 12:03:36 01/11/04
Go up one level in this thread
On January 11, 2004 at 14:26:16, James T. Walker wrote:
>Fritz 8 seems to consider only Be5. Also note it already has 1 tablebase hit.
>
>New game
>[D]4n3/pp5p/6k1/2P2pp1/5p2/2B2P2/PPK3PP/8 w - - 0 1
>
>Analysis by Fritz 8:
>
>1.Be5 Kf7 2.Kd3 Ke6 3.Kd4 a5 4.b3 Kf7 5.a3 Ke6 6.b4 axb4 7.axb4 Kd7 8.b5
> ² (0.63) Depth: 7/12 00:00:00 16kN
> ± (1.09) Depth: 18/40 00:02:29 116280kN, tb=1
Same with DF8. DF8 & F8 seem to have some (special) knowledge about won pawn
endings.
[D]8/pp5p/6k1/2P2pp1/5p2/5P2/PPK3PP/8 w - - 0 1
This is the position, without the B & N. It is, without a doubt, a won pawn
ending for white.
So what you have to do, is figure a way to 'remove' the pieces from play. Be5
does this, by making the knight unable to move without being captured.
But...not everyone knows this is a won pawn ending. Or else everyone would
immediatly play Be5. :)
It took Crafty 2:12 to see Be5 in the PV, from the original position. If you
remove the B & N, it is clear to any master this game is won for white. But
Crafty doesn't seem to see that very well...
starting thread 1
8 0.36 0.23 1. b4 Kf6 2. b5 Ke5 3. h4 Kd5 4. hxg5
Kxc5
8 0.40 0.24 1. Kd3 Kf6 2. Kd4 Ke6 3. b4 h5 4. a4
h4 <HT>
8-> 0.45 0.24 1. Kd3 Kf6 2. Kd4 Ke6 3. b4 h5 4. a4
h4 <HT> (s=5)
9 0.56 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 Kd4 6. Kxa7 (s=4)
9-> 0.70 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 Kd4 6. Kxa7
10 0.89 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 Kd4 6. Kxa7
10-> 1.19 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 Kd4 6. Kxa7
11 1.64 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 g4 6. fxg4 fxg4 7.
Kxa7
11-> 2.20 0.47 1. Kd3 Kf6 2. Kc4 Ke6 3. Kb5 Kd5 4.
c6 bxc6+ 5. Ka6 g4 6. fxg4 fxg4 7.
Kxa7
12 3.70 0.79 1. Kd3 Kf6 2. b4 Ke6 3. Kd4 a6 4. c6
bxc6 5. Kc5 Kd7 6. Kb6 Kd6 <HT>
12-> 4.56 0.79 1. Kd3 Kf6 2. b4 Ke6 3. Kd4 a6 4. c6
bxc6 5. Kc5 Kd7 6. Kb6 Kd6 <HT>
13 7.51 1.09 1. Kd3 Kf6 2. Kd4 Ke6 3. b4 h5 4. b5
h4 5. h3 a5 6. bxa6 bxa6 7. c6 a5 <HT>
13-> 9.00 1.09 1. Kd3 Kf6 2. Kd4 Ke6 3. b4 h5 4. b5
h4 5. h3 a5 6. bxa6 bxa6 7. c6 a5 <HT>
14 14.45 0.82 1. Kd3 Kf6 2. Kc4 Ke6 3. b4 h6 4. b5
h5 5. c6 bxc6 6. bxc6 Kd6 7. Kb5 h4
8. a4 <HT>
14-> 17.67 0.82 1. Kd3 Kf6 2. Kc4 Ke6 3. b4 h6 4. b5
h5 5. c6 bxc6 6. bxc6 Kd6 7. Kb5 h4
8. a4 <HT>
15 28.51 0.93 1. Kd3 Kf6 2. b4 Ke5 3. Kc4 Ke6 4.
Kd4 h5 5. a4 h4 6. h3 a6 7. b5 Kd7
8. c6+ Kc7 9. bxa6 bxa6 10. Kc5 <HT>
15-> 34.11 0.93 1. Kd3 Kf6 2. b4 Ke5 3. Kc4 Ke6 4.
Kd4 h5 5. a4 h4 6. h3 a6 7. b5 Kd7
8. c6+ Kc7 9. bxa6 bxa6 10. Kc5 <HT>
16 52.75 0.93 1. Kd3 Kf6 2. b4 Ke5 3. Kc4 Ke6 4.
Kd4 h5 <HT>
16-> 1:05 0.93 1. Kd3 Kf6 2. b4 Ke5 3. Kc4 Ke6 4.
Kd4 h5 <HT>
17 2:09 0.95 1. Kd3 Kf6 2. b4 Ke6 3. Kd4 h5 4. h4
gxh4 5. a4 a6 6. a5 Kf6 7. b5 Ke7 8.
bxa6 bxa6 9. Ke5 h3 10. gxh3
17 2:35 16/16* 1. h3
17-> 2:51 0.95 1. Kd3 Kf6 2. b4 Ke6 3. Kd4 h5 4. h4
gxh4 5. a4 a6 6. a5 Kf6 7. b5 Ke7 8.
bxa6 bxa6 9. Ke5 h3 10. gxh3
? 18 2:51 1/16* 1. Kd3
White(1): ?
time=2:55 cpu=180% mat=0 n=192092885 fh=96% nps=1.10M
ext-> chk=8626566 cap=1597116 pp=3273916 1rep=279219 mate=3508
predicted=0 nodes=192092885 evals=38996368
endgame tablebase-> probes=134 hits=1
SMP-> split=1518 stop=93 data=7/4096 cpu=5:16 elap=2:55
DF8 on the other hand, has no problems at all.
Deep Fritz 8
8/pp5p/6k1/2P2pp1/5p2/5P2/PPK3PP/8 w - - 0 1
Analysis by Deep Fritz 8:
1.Kd3 Kf6 2.Kd4 Ke6 3.b4 h5 4.b5
± (1.36) Depth: 7/11 00:00:00 12kN
1.Kd3 Kf6 2.Kd4 Ke6 3.b4 h5 4.b5 h4
± (1.31) Depth: 8/13 00:00:00 29kN
1.Kd3 Kf6 2.Kd4 Ke6 3.b4 h5 4.b5 h4 5.a3
± (1.27) Depth: 9/15 00:00:00 77kN
1.Kd3 Kf6 2.Kd4 Ke6 3.b4 h5 4.h4 gxh4 5.b5 Kf6
± (1.36) Depth: 10/18 00:00:00 192kN
1.Kd3 Kf6 2.Kc4 Ke6 3.b4 g4 4.b5 h6 5.h3 Kd7 6.Kd5
+- (1.46) Depth: 11/20 00:00:00 581kN
1.Kd3 Kf6 2.b4 Ke6 3.Kd4 h6 4.b5 g4 5.h3 g3 6.Kc4 Kf6
+- (1.54) Depth: 12/21 00:00:02 1639kN
1.Kd3 Kf6 2.Kc4 Ke5 3.b4 Ke6 4.b5 h6 5.a4 Kd7 6.Kd5 a6 7.Ke5
+- (1.74) Depth: 13/24 00:00:04 3664kN
1.Kd3 Kf6 2.Kc4 Ke5 3.c6 bxc6 4.Kc5 h5 5.b4 g4 6.h3
+- (1.96) Depth: 14/31 00:00:09 7528kN
1.Kd3 Kf6 2.Kc4 Ke5 3.c6 bxc6 4.Kc5 h5 5.b4 g4 6.Kxc6 h4 7.h3 Kd4 8.b5 gxh3
9.gxh3 Ke3 10.Kb7
+- (2.19) Depth: 15/36 00:00:19 15697kN
1.Kd3!
+- (2.47) Depth: 16/34 00:00:33 27261kN
1.Kd3 Kf6 2.Kc4 Ke6 3.Kb5 Kd7 4.c6+ Kc7 5.cxb7 Kxb7 6.Kc5 h6 7.Kd5 Kb6 8.Ke5 a5
9.b3 a4 10.Kxf5 axb3
+- (2.55) Depth: 16/35 00:00:43 35890kN
1.Kd3 Kf6 2.Kc4 Ke6 3.Kb5 Kd7 4.c6+ Kc7 5.cxb7 Kxb7 6.Kc5 h6 7.Kd5 Kb6 8.Ke5 a5
9.b3 a4 10.Kxf5 axb3
+- (2.55) Depth: 16/38 00:00:54 45497kN
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