Author: Dann Corbit
Date: 23:39:49 06/09/05
Go up one level in this thread
On June 09, 2005 at 23:59:48, Daniel Shawul wrote:
>Bxe4 is the suggested best move at this position.
>My engine can't find it even after a very long time.
>Is it a zugzwang problem?
>[D]8/3p4/p1bk3p/Pp6/1Kp1PpPp/2P2P1P/2P5/5B2 b - -
>where can i find complete analysis of these positions?
>Daniel
LCTII is pretty sound I think.
Some things about that position:
1. There is a wall formed that has only one door
2. How high do you evaluate a passed pawn?
3. Nullmove might come into play, because you trade a biship for a pawn to make
a passed pawn.
Here is crafty output:
White(1): epdpfga \lct25.epd lct25.out
PFGA: EPD record: 1 ID: LCTII.FIN.03
time surplus 0.00 time limit 16:39 (16:39)
depth time score variation (1)
11 0.11 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
11-> 0.32 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
12 0.52 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
12-> 0.78 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
13 1.02 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
13-> 1.39 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
14 1.82 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
14-> 2.52 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
15 3.16 0.00 1. ... Bb7 2. Be2 Bc6 3. Ka3 Ke5 4.
Kb4 Kd6
15 4.74 -0.36 1. ... Bxe4 2. fxe4 f3 3. Ka3 Ke5 4.
Kb4 Kxe4 5. Kc5 Ke3 6. Kb6 Kf2 7. Kxa6
Kxf1 8. Kxb5 Ke2
15-> 5.00 -0.36 1. ... Bxe4 2. fxe4 f3 3. Ka3 Ke5 4.
Kb4 Kxe4 5. Kc5 Ke3 6. Kb6 Kf2 7. Kxa6
Kxf1 8. Kxb5 Ke2
16 5.57 -1 1. ... Bxe4!!
16 6.32 -0.76 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 Ke4 6. Kc5 Ke3 7. Kb6
Kf2 8. Kxa6 Kxf1 9. Kxb5 f2 10. a6
Ke2 <HT>
16-> 8.96 -0.76 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 Ke4 6. Kc5 Ke3 7. Kb6
Kf2 8. Kxa6 Kxf1 9. Kxb5 f2 10. a6
Ke2 <HT>
17 13.10 -1 1. ... Bxe4!!
17 14.36 -1.26 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 <HT>
17-> 19.47 -1.26 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 <HT>
18 21.42 -1 1. ... Bxe4!!
18 24.19 -2.24 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 7. Kb2
Ke3 8. Kc1 Kf2 9. Bxc4 bxc4 10. Kd2
Kg2
18-> 33.05 -2.24 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 7. Kb2
Ke3 8. Kc1 Kf2 9. Bxc4 bxc4 10. Kd2
Kg2
19 39.08 -2.14 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 7. Kb2
Ke3 8. Kc1 Kf2 9. Bxc4 bxc4 10. Kd2
Kg2 11. Ke3
19-> 1:02 -2.14 1. ... Bxe4 2. fxe4 f3 3. e5+ Kd5 4.
Ka3 Kxe5 5. Kb4 d6 6. Ka3 Ke4 7. Kb2
Ke3 8. Kc1 Kf2 9. Bxc4 bxc4 10. Kd2
Kg2 11. Ke3
20 1:09 -1 1. ... Bxe4!!
20 1:20 -3 1. ... Bxe4!!
20 3:02 -5.43 1. ... Bxe4 2. Be2 Bxc2 3. Bf1 Kd5
4. Ka3 Bd3 5. Bg2 Kc5 6. Bh1 d5 7.
Kb2 b4 8. cxb4+ Kxb4 9. Kc1 Kxa5 10.
Kd2 d4 11. Bg2 Kb4 12. Ke1 <HT>
20-> 3:40 -5.43 1. ... Bxe4 2. Be2 Bxc2 3. Bf1 Kd5
4. Ka3 Bd3 5. Bg2 Kc5 6. Bh1 d5 7.
Kb2 b4 8. cxb4+ Kxb4 9. Kc1 Kxa5 10.
Kd2 d4 11. Bg2 Kb4 12. Ke1 <HT>
21 5:14 -5.73 1. ... Bxe4 2. Be2 Bxc2 3. Bf1 Kd5
4. Ka3 Bd3 5. Bg2 Kc5 6. Bh1 d5 7.
Kb2 b4 8. cxb4+ Kxb4 9. Kc1 Kxa5 10.
Kd2 d4 11. Bg2 Kb4 12. Bh1 Bg6
21-> 7:00 -5.73 1. ... Bxe4 2. Be2 Bxc2 3. Bf1 Kd5
4. Ka3 Bd3 5. Bg2 Kc5 6. Bh1 d5 7.
Kb2 b4 8. cxb4+ Kxb4 9. Kc1 Kxa5 10.
Kd2 d4 11. Bg2 Kb4 12. Bh1 Bg6
22 11:22 -6.08 1. ... Bxe4 2. Be2 Bxc2 3. Bf1 Bd3
4. Bg2 Kd5 5. Ka3 Kc5 6. Bh1 d5 7.
Kb2 b4 8. cxb4+ <HT>
22 12:00 2/9* 1. ... Ke7
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