Author: Bernhard Bauer
Date: 23:43:14 03/26/00
The following position is a study by M. Liburkin.
[D]6bk/8/5P/p3PP/8/8/3K/8 w
With tablebases enabled Crafty 17.10 gives
(2) 10-> 4.89 -27.39 1. Bf4+ Kh1 2. Ke2 d3+ 3. Kf3 f1=Q+
4. Ke4 Qxf4+ 5. Kd5 d2 6. Kc5 e2 7.
Kc6 Kg2 8. Kd5 Kf2
11 4.93 -- 1. Bf4+
11 6.86 -Mat17 1. Bf4+ Kh1 2. Ke2 d3+ 3. Kxe3 <HT>
11-> 8.08 -Mat17 1. Bf4+ Kh1 2. Ke2 d3+ 3. Kxe3 <HT>
12 48.75 -Mat17 1. Bf4+ Kh1 2. Bg3 e2+ 3. Kxe2 <HT>
12-> 51.01 -Mat17 1. Bf4+ Kh1 2. Bg3 e2+ 3. Kxe2 <HT>
13 53.09 -Mat17 1. Bf4+ Kh1 2. Bg3 e2+ 3. Kxe2 <HT>
(2) 13-> 54.58 -Mat17 1. Bf4+ Kh1 2. Bg3 e2+ 3. Kxe2 <HT>
14 1:00 -Mat17 1. Bf4+ Kh1 2. Bg3 e2+ 3. Kxe2 <HT>
time=1:00 cpu=219% mat=0 n=39039363 fh=98% nps=644639
ext-> checks=8542971 recaps=61 pawns=98826 1rep=531776 thrt:8841
predicted=0 nodes=39039363 evals=348652
endgame tablebase-> probes done=3551 successful=1499
SMP-> split=1357 stop=164 data=11/64 cpu=2:12 elap=1:00
mated in 17 moves.
However, whithout the use of tablebases Crafty finds the draw.
22-> 22.44 -3.08 1. Bh4 Kh3 2. Bxf2 exf2 3. Kxf2 Kg4
4. Ke2 Kf4 5. Kd2 Ke4 6. Ke2 d3+ 7.
Kd2 Kd4 8. Kd1 Kd5 9. Ke1 Ke5 10. Kd1
Kd4 11. Kd2 Kc4 12. Kd1 Kc3
23 34.69 -3.08 1. Bh4 Kh3 2. Bxf2 exf2 3. Kxf2 Kg4
4. Ke2 Kf4 5. Kd2 Ke4 6. Ke2 d3+ 7.
Kd2 Kd4 8. Kd1 Kd5 9. Ke1 Ke5 10. Kd1
Kd4 11. Kd2 Kc4 12. Kd1 Kc3 13. Ke1
23-> 35.37 -3.08 1. Bh4 Kh3 2. Bxf2 exf2 3. Kxf2 Kg4
4. Ke2 Kf4 5. Kd2 Ke4 6. Ke2 d3+ 7.
Kd2 Kd4 8. Kd1 Kd5 9. Ke1 Ke5 10. Kd1
Kd4 11. Kd2 Kc4 12. Kd1 Kc3 13. Ke1
time=1:00 cpu=201% mat=0 n=47295543 fh=87% nps=784207
ext-> checks=2694492 recaps=1016 pawns=104526 1rep=10254 thrt:1075
predicted=0 nodes=47295543 evals=475200
endgame tablebase-> probes done=0 successful=0
SMP-> split=5588 stop=241 data=11/64 cpu=2:01 elap=1:00
In the second example Crafty doesn't get mated. As I don't have all the 5-man
table bases installed I'm not shure if this is my fault or Crafty's.
Kind regards
Bernhard
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