Author: Robert Hyatt
Date: 14:30:37 02/12/01
Go up one level in this thread
On February 12, 2001 at 01:26:24, Jouni Uski wrote:
>I use Crafty mostly to endgame analysis, where it's very good specially in
>pawn/rook endings. After upgrading to 18.01 (Chessbase) I was a little
>disappointed to find some positions, which it can't solve, but 17.14 can.
>Here's 3 examples:
>
>[D]5k2/p1p4R/1pr5/3p1pP1/P2P1P2/2P2K2/8/8 w - -
>[D]k7/8/2p5/4P3/4B3/6p1/8/2n3K1 w - -
>[D]8/2p5/p1P1p3/P3kb2/1P4pp/8/5R2/7K w - -
>
> 17.14 18.01
>1. Kg3 84s >600s
>2. Bd3 86s >600s
>3. Rxf5 1s >600s
>
>I tested in AMD450Mhz and 116MB hash.
>
>Jouni
Do you have any position.bin files lying around? If so delete them. I
just ran this and got the following on my quad:
(2) 10-> 0.72 0.47 1. Ke2 Rxc3 2. Rd7 Rc2+ 3. Kd3 Rf2
4. Ke3 Ra2 5. Rxd5 Ra3+ 6. Kd2 Ra2+
7. Kc3 Rxa4 8. Rxf5+ Ke7 9. Rf6 <HT>
11 0.92 0.56 1. Ke2 Rxc3 2. Rd7 Rc2+ 3. Kd3 Rf2
4. Ke3 Ra2 5. Rxd5 Ra3+ 6. Ke2 <HT>
11-> 1.40 0.56 1. Ke2 Rxc3 2. Rd7 Rc2+ 3. Kd3 Rf2
4. Ke3 Ra2 5. Rxd5 Ra3+ 6. Ke2 <HT>
12 2.10 0.47 1. Ke2 Rxc3 2. Rd7 Rc2+ 3. Kd3 Rf2
4. Ke3 Ra2 5. Rxd5 Ra3+ 6. Ke2 Ra2+
7. Kf3 Ra3+ 8. Kf2 Ke7 9. Rxf5 Rxa4
12 4.84 0.82 1. Rd7 Rxc3+ 2. Ke2 Ra3 3. Rxd5 a5
4. Rxf5+ Kg7 5. d5 Rxa4 6. Ke3 b5 7.
Re5 Kg6
(2) 12-> 4.84 0.82 1. Rd7 Rxc3+ 2. Ke2 Ra3 3. Rxd5 a5
4. Rxf5+ Kg7 5. d5 Rxa4 6. Ke3 b5 7.
Re5 Kg6
13 7.72 1.05 1. Rd7 Rxc3+ 2. Ke2 Ra3 3. Rxd5 Kg7
4. Rxf5 Rxa4 5. Kd3 Rb4 6. Re5 c5 7.
Re7+ Kg6 8. Rd7
13-> 10.82 1.05 1. Rd7 Rxc3+ 2. Ke2 Ra3 3. Rxd5 Kg7
4. Rxf5 Rxa4 5. Kd3 Rb4 6. Re5 c5 7.
Re7+ Kg6 8. Rd7
14 18.48 0.81 1. Rd7 Rxc3+ 2. Ke2 c6 3. Rxa7 Rc4
4. Kd3 c5 5. dxc5 bxc5 6. g6 Rxf4 7.
Rf7+ Ke8 8. a5 Rf3+ 9. Ke2
Rf7+ Ke8 8. a5 Rf3+ 9. Ke2
14 38.21 0.94 1. Kg3 Rxc3+ 2. Kh4 Rd3 3. g6 Rxd4
4. Kg5 Rc4 5. Kf6 Rc6+ 6. Kxf5 Rc4
7. Rf7+ Kg8 8. Rd7 d4 9. Rd8+ Kg7 10.
Rd7+ Kh6
(2) 14-> 38.21 0.94 1. Kg3 Rxc3+ 2. Kh4 Rd3 3. g6 Rxd4
4. Kg5 Rc4 5. Kf6 Rc6+ 6. Kxf5 Rc4
7. Rf7+ Kg8 8. Rd7 d4 9. Rd8+ Kg7 10.
Rd7+ Kh6
15 47.05 1.02 1. Kg3 Rxc3+ 2. Kh4 Rd3 3. g6 Rxd4
4. Kg5 Rc4 5. Kf6 Rc6+ 6. Kxf5 d4 7.
Rd7 Rc4 <HT>
(4) 15-> 1:17 1.02 1. Kg3 Rxc3+ 2. Kh4 Rd3 3. g6 Rxd4
4. Kg5 Rc4 5. Kf6 Rc6+ 6. Kxf5 d4 7.
Rd7 Rc4 <HT>
IE 38 seconds to go back to Kg3 and it sticks there.
Position 2:
(2) 16 43.63 1.43 1. e6 Ne2+ 2. Kh1 g2+ 3. Bxg2 Ng3+
4. Kh2 Nf5 5. Kh3 Ne7 6. Kh4 Kb7 7.
Kg5 Kc7 8. Kf6 Kd6 9. Bf3 Ng8+ 10.
Kf5 c5
16 52.34 ++ 1. Bd3!!
I stopped it there...
Position 3:
Thru one minute it likes b5, which probably won't change on your machine
as it is significantly slower. at 1:11 b5 fails low and it moves on to
the right move. This might be a result of the removed recapture extension,
looking at the PV. I am sure it plays better with this off, overall. I
tested for thousands of games to compare.
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