Author: Dann Corbit
Date: 14:00:12 03/04/06
Go up one level in this thread
On March 04, 2006 at 16:54:21, Dann Corbit wrote:
>On March 04, 2006 at 16:48:33, Dann Corbit wrote:
>
>>On March 04, 2006 at 16:30:09, Charles Roberson wrote:
>>
>>>
>>>
>>> Telepath drew a won endgame in a blitz match this week. The position is:
>>> 8/8/8/5BB1/8/3p1kpp/7P/7K w - - 0 76
>>>
>>> It only searched 6 ply and played Bxh3.
>
>OOPS!! I thought your program played Bxd3. Bxh3 is just awful. Bxd3 wins
>also, but hxg3 is the clear choice here. If he tries to push the pawn towards
>queen by backing with his king, you cough up a bishop for a queen. And if he
>takes it with his king, you clear off all of his pawns easily and do the
>diagonal bishop dance for an easy win.
I am wrong (I just analyzed the position after Bxh3 with Shredder). Bxh3 wins
also. So don't worry about Bxh3. With the right plan, it is a very good move.
Analysis from E:\ttt2.epd
3/4/2006 1:57:36 PM Level: 999 Seconds
Analyzing engine: Shredder9UCI
1) 0 76
Avoid move:
Best move (Shredder9UCI): Kf3-f2
Not found in: 16:39
2/2- 00:01 21 14 -6.33 Kf3e2
2/4 00:01 49 32 -6.60 Kf3e2 Bh3g4+ Ke2f2
2/4+ 00:01 69 45 -5.66 d3d2
2/4 00:01 72 47 -5.66 d3d2 Bg5xd2
3/5- 00:01 104 67 -7.43 d3d2 Bg5xd2
3/7 00:01 194 126 -7.43 d3d2 Bg5xd2
3/7+ 00:01 277 180 -6.85 Kf3f2
3/7+ 00:01 298 194 -6.44 Kf3f2
3/7 00:01 304 198 -6.44 Kf3f2 h2xg3 Kf2f3
4/7 00:01 433 279 -6.50 Kf3f2 h2xg3 Kf2f3 Kh1h2
5/7- 00:01 591 378 -8.26 Kf3f2 h2xg3
5/7 00:01 736 471 -8.26 Kf3f2 h2xg3 Kf2e1 Bh3f5
5/11+ 00:01 1.694 1.073 -7.31 Kf3e4
5/11+ 00:01 1.774 1.124 -6.94 Kf3e4
5/11 00:01 2.467 1.563 -6.65 Kf3e4 h2xg3 Ke4d4 g3g4 Kd4e4
6/7- 00:01 2.712 1.685 -7.00 Kf3e4 h2xg3
6/7- 00:01 2.759 1.714 -M150 Kf3e4 h2xg3
6/9 00:01 3.179 1.866 -M20 Kf3e4 h2xg3 Ke4e5 Bh3f5 Ke5xf5
6/9+ 00:01 3.577 2.062 -M21 g3g2+
6/11 00:01 4.254 2.408 -8.83 g3g2+ Bh3xg2+ Kf3g4 h2h4 Kg4f5 Bg2f1
Kf5e4 h4h5
7/10- 00:01 4.602 2.605 -9.08 g3g2+ Bh3xg2+
7/11- 00:01 4.745 2.664 -10.01 g3g2+ Bh3xg2+
7/12 00:01 5.724 2.955 -10.19 g3g2+ Bh3xg2+ Kf3g4 h2h4 Kg4h5 Bg2f1
d3d2 Bf1e2+ Kh5g6 Bg5xd2
8/13- 00:02 6.104 2.937 -10.58 g3g2+ Bh3xg2+
8/15- 00:02 7.399 3.560 -11.08 g3g2+ Bh3xg2+
8/15 00:02 9.079 4.211 -M17 g3g2+ Bh3xg2+ Kf3f2 Bg2f1 Kf2xf1
8/15+ 00:02 10.447 4.845 -M18 Kf3e4
8/15 00:02 13.985 5.966 -M20 Kf3e4 h2xg3 Ke4e5 Bh3f5 Ke5xf5
9/13 00:02 17.116 6.224 -M20 Kf3e4 h2xg3 Ke4e5 Bh3f5 Ke5xf5
10/13 00:02 20.859 7.457 -M20 Kf3e4 h2xg3 Ke4e5 Bh3f1 Ke5f5 Bf1xd3+
11/19 00:03 29.928 9.390 -M19 Kf3e4 h2xg3 Ke4e5 Bh3f1 Ke5f5 Bg5d2
Kf5e4 Bf1xd3+
12/20 00:03 39.491 10.359 -M19 Kf3e4 h2xg3 Ke4e5 Bh3f1 Ke5f5 Bg5d2
Kf5e4 Bf1xd3+
13/21 00:04 77.873 16.614 -M17 Kf3e4 h2xg3 Ke4e5 Bh3f1 Ke5f5 Bg5c1
Kf5e4 g3g4 Ke4d4 Bf1xd3
13/21+ 00:06 112.628 18.821 -M17 Kf3e2
13/21 00:06 126.847 20.976 -M18 Kf3e2 h2xg3 Ke2f2 Bh3f5 Kf2e2 Bg5c1
d3d2 Bc1xd2
14/21 00:06 146.441 22.693 -M18 Kf3e2 h2xg3 Ke2f2 Bh3f5 Kf2e2 Bg5c1
d3d2 Bc1xd2
15/32 00:09 603.103 61.660 -M15 Kf3e2 Kh1g2 d3d2
15/32+ 00:10 726.874 68.611 -M15 Kf3e4
15/32 00:10 815.431 75.854 -M16 Kf3e4 h2xg3 Ke4e5 Bh3f1 Ke5f5 Bg5h6
Kf5g6
15/32+ 00:11 881.072 79.311 -M16 Kf3f2
15/32 00:11 924.590 82.759 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
16/24 00:11 970.426 84.267 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
17/27 00:12 1.075.294 88.457 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
18/29 00:13 1.225.262 92.256 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
19/30 00:15 1.425.200 93.077 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
20/32 00:16 1.662.756 99.643 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
21/31 00:20 2.748.774 135.534 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
22/32 00:21 3.575.281 163.913 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
23/31 00:23 4.679.546 197.816 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
24/32 00:25 6.184.404 239.445 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
25/34 00:27 8.107.054 291.652 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
26/34 00:30 10.749.427 353.529 -M17 Kf3f2 h2xg3 Kf2e1 Bh3g4 Ke1f2 Bg4f5
Kf2e2 g3g4 d3d2 Bg5xd2
3/4/2006 1:59:24 PM, Time for this analysis: 00:01:45, Rated time: 16:39
0 of 1 matching moves
3/4/2006 1:59:25 PM, Total time: 12:01:48 AM
Rated time: 16:39 = 999 Seconds
>>> At 10 ply it played Bxd3.
>>>
>>> Seems to me the better move is Bxd3 or h2xg3.
>>> I've tried upping the outside passer value by 4x and adjusting
>>> the code to call the d3 pawn an outside passer. Now, it makes
>>> Bxd3 at 9 ply and h2xg3 at 10 ply then Bxd3 at 11 ply.
>>>
>>> Seems I should be able to adjust it to see this earlier or would
>>> that be overtuning?
>>
>>Rybka likes Kg1 (which wins, but is a very puzzling choice because hxg3
>>obviously wins very easily.) Considering Rybka's long struggle to get off of
>>the drawing Bxd3 I would not be too worried about it if my program struggled
>>with it a while also. However, a 6 ply depth is a great concern if your program
>>has more than one second of think time. Why so shallow? Severe time pressure?
>>
>>Analysis from e:\ttt.epd
>>3/4/2006 1:34:36 PM Level: 999 Seconds
>>Analyzing engine: Rybka v1.01 Preview 2.w32
>>
>>1) 0 76
>> Avoid move:
>> Best move (Rybka v1.01 Preview 2.w32): Kh1-g1
>> Not found in: 16:39
>> 3 00:00 5.744 74.453 +6.63 Bf5xd3
>> 4 00:00 7.300 78.686 +6.95 Bf5xd3
>> 5 00:00 8.974 82.787 +5.80 Bf5xd3 Kf3g4
>> 6 00:00 11.816 109.005 +6.69 Bf5xd3 Kf3g4 Bg5c1
>> 7 00:00 7.248 58.904 +6.69 Bf5xd3 Kf3g4 Bg5c1 g3g2+ Kh1g1 Kg4h5
>> 8 00:00 19.898 107.807 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5
>> 9 00:00 40.591 155.674 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5
>> 10 00:00 80.591 187.984 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3
>> 11 00:00 150.801 209.810 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4
>> 12 00:01 265.335 225.666 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6
>> 13 00:02 444.369 236.627 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5
>> 14 00:03 712.987 244.507 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 15 00:05 1.105.819 250.688 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 16 00:06 1.662.474 255.113 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 17 00:09 2.448.383 257.936 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 18 00:14 3.549.358 258.999 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 19 00:20 4.997.370 260.741 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 20 00:27 6.939.724 260.618 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 21 00:37 9.331.828 261.008 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 22 00:50 12.634.594 261.032 +6.75 Bf5xd3 Kf3g4 Bg5c1 g3xh2 Kh1xh2 Kg4h4
>>Bd3f5 Kh4h5 Bf5xh3 Kh5h4 Bh3e6 Kh4h5 Be6f5 Kh5h4
>> 22 02:25 34.944.570 247.097 +16.60 Kh1g1 d3d2 Bg5xd2 Kf3e2 Bd2g5 Ke2f3
>>Bg5c1 g3g2 Bf5xh3 Kf3e2 Bh3xg2 Ke2d1 Bc1e3 Kd1c2
>> 23 02:44 39.836.036 247.997 +16.66 Kh1g1 d3d2 Bg5xd2 Kf3e2 Bd2g5 Ke2f3
>>Bg5c1 g3g2 Bf5xh3 Kf3e2 Bh3xg2 Ke2d1 Bc1e3 Kd1c2
>> 24 05:03 71.486.462 241.254 +M75 Kh1g1 d3d2 Bg5xd2 Kf3e2 Bd2g5 Ke2f3
>>Bg5c1 g3g2 Bf5xh3 Kf3e4 Bh3xg2+ Ke4f5 Bg2f3 Kf5g6
>> 3/4/2006 1:43:36 PM, Time for this analysis: 00:08:56, Rated time: 16:39
>>
>>0 of 1 matching moves
>>3/4/2006 1:43:36 PM, Total time: 12:08:59 AM
>>Rated time: 16:39 = 999 Seconds
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