Author: Dieter Buerssner
Date: 12:41:13 10/10/05
Go up one level in this thread
On October 09, 2005 at 19:17:31, Peter Berger wrote:
>The fail-low needs some depth. I think it should happen at ply 24.
Hi Peter, I got the analysis following after 12 hours. I set things to more or
less default settings. 3-5 men complete TBs with normal probing, bitbases,
Centrino 1,7 GHz, 700 MB hash. Score is steadily rising, +6 after 1 minute and
almost +20 after 10 hours at depth 25. I'll let it run further for some while.
As we discussed privately, the cause for the fail low to zero might be somewhere
else. I'd be very interested to get a scenario, where I can reproduce it.
Cheers,
Dieter
8/1k4p1/8/5p1p/PPP5/6K1/8/8 w - -
Engine: Yace via ssh (700 MB)
von Dieter Buerssner
7/20 0:00 +0.10 1.a5 Ka6 2.Kf3 h4 3.Kg2 f4 4.Kf3 h3
5.Kf2 g6 6.Kf3 g5 7.c5 Kb5 8.a6 (360.048) 835
7/21 0:00 +0.10 1.a5 Ka6 2.Kf3 h4 3.Kg2 f4 4.Kf3 h3
5.Kf2 g6 6.Kf3 g5 7.c5 Kb5 8.a6 (577.781) 961
8/21 0:00 -0.30-- 1.a5 Ka6 2.Kf3 h4 3.Kg2 f4 4.b5+ Kxa5
5.Kh2 g5 6.Kg1 f3 7.Kf1 f2 8.Kxf2 h3 (691.700) 1015
8/23 0:00 -1.13 1.a5 Ka6 2.Kf2 h4 3.c5 Kb5 4.Kg2 f4
5.c6 Kxc6 6.a6 g5 7.b5+ Kb6 8.Kf3 (1.013.233) 1111
8/25 0:01 -1.13 1.a5 Ka6 2.Kf2 h4 3.c5 Kb5 4.Kg2 f4
5.c6 Kxc6 6.a6 g5 7.b5+ Kb6 8.Kf3 (1.587.529) 1200
9/26 0:01 -1.24 1.a5 Ka6 2.c5 Kb5 3.c6 Kxc6 4.a6 Kb6
5.b5 g5 6.Kg2 h4 7.Kh3 Ka7 8.Kg2 g4
9.Kf2 (2.253.436) 1256
9/26 0:01 -1.24 1.a5 Ka6 2.c5 Kb5 3.c6 Kxc6 4.a6 Kb6
5.b5 g5 6.Kg2 h4 7.Kh3 Ka7 8.Kg2 g4
9.Kf2 (2.482.560) 1271
10/30 0:03 -0.84++ 1.a5 Ka6 2.Kg2 g5 3.Kh2 f4 4.Kg1 h4
5.Kg2 Ka7 6.c5 Kb7 7.Kf3 h3 8.b5 h2
9.c6+ Ka8 10.Kg2 g4 11.a6 Ka7 12.c7 h1T
13.c8D Th3 (4.420.661) 1305 TB:2
10/30 0:03 -0.84 1.a5 Ka6 2.Kg2 f4 3.Kf1 g5 4.Kf2 g4
5.Kg2 Ka7 6.a6 Kxa6 7.Kf2 Ka7 8.Kf1 h4
9.c5 f3 10.c6 h3 11.c7 h2 12.c8L (4.563.290) 1309 TB:2
10/30 0:05 -0.84 1.a5 Ka6 2.Kg2 f4 3.Kf1 g5 4.Kf2 g4
5.Kg2 Ka7 6.a6 Kxa6 7.Kf2 Ka7 8.Kf1 h4
9.c5 f3 10.c6 h3 11.c7 h2 12.c8L (6.999.571) 1349 TB:2
11/31 0:07 -0.44++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 h4
5.Kxf4 h3 6.c6 h2 7.c7 g5+ 8.Kxg5 h1D
9.c8D Dc6 (10.459.696) 1379 TB:2
11/31 0:08 -0.24 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 Kc6
9.a6 f3 10.Kg3 Kc7 11.b5 h2 12.Kxh2 Kb8
13.a7+ Kxa7 14.c6 (12.061.729) 1381 TB:3
11/33 0:09 -0.24 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 Kc6
9.a6 f3 10.Kg3 Kc7 11.b5 h2 12.Kxh2 Kb8
13.a7+ Kxa7 14.c6 (13.058.625) 1387 TB:4
12/33 0:10 -0.45 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kxb4
13.a6 (15.109.478) 1406 TB:4
12/35 0:11 -0.45 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kxb4
13.a6 (16.457.147) 1411 TB:4
13/36 0:15 +0.01++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 Ka4 10.a6 Kxb4 11.c6 Kc3 12.a7 h2
13.Kxh2 Kc4 14.a8D (22.145.906) 1390 TB:66
13/36 0:18 +1.01++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 Ka6 10.c6 f2 11.Kxf2 h2 12.Kg2 Kb5
13.a6 g3 14.a7 (25.659.700) 1388 TB:66
13/36 0:19 +1.12 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 Kc6 10.a6 Kc7 11.b5 Kc8 12.c6 Kb8
13.b6 h2 14.Kxh2 (27.716.722) 1395 TB:66
13/36 0:20 +1.12 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 Kc6 10.a6 Kc7 11.b5 Kc8 12.c6 Kb8
13.b6 h2 14.Kxh2 (29.239.709) 1401 TB:66
14/37 0:24 +1.52++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 Kc6 10.a6 Kc7 11.b5 h2 12.Kxh2 f2
13.b6+ Kd8 14.Kg2 (34.247.481) 1407 TB:66
14/37 0:27 +1.75 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc4
13.c6 g2+ 14.Kxg2 (38.448.783) 1401 TB:97
14/37 0:29 +1.75 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc4
13.c6 g2+ 14.Kxg2 (41.003.456) 1405 TB:122
15/39 0:34 +2.15++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Ka6
13.c6 g2+ 14.Kxh2 (48.344.819) 1390 TB:187
15/39 0:39 +3.15++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 Kxb4
12.a6 g3 13.a7 h1T 14.a8D (55.237.558) 1393 TB:187
15/40 0:44 +4.75 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (62.507.068) 1402 TB:189
15/40 0:47 +4.75 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (65.856.033) 1393 TB:208
16/40 0:55 +5.15++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 Kc6 12.a6 g3
13.b5+ Kd5 14.a7 (76.870.468) 1397 TB:208
16/40 1:02 +6.15++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 Kc6 12.a6 Kd7
13.a7 h1T 14.a8D (87.644.386) 1406 TB:208
16/41 1:07 +6.24 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (96.119.691) 1416 TB:208
16/41 1:11 +6.24 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (101.241.158) 1421 TB:208
17/42 1:24 +6.64++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 Kxb4
12.a6 Kb5 13.a7 g3 14.a8D (119.827.662) 1419 TB:222
17/42 1:43 +7.64++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Ka4
13.c6 Ka3 14.c7 (146.904.880) 1422 TB:223
17/42 1:53 +7.74 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.Kg2 (161.383.775) 1424 TB:301
17/43 2:00 +7.74 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.Kg2 (169.304.496) 1409 TB:558
18/43 2:30 +8.14++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 g2+ 14.Kxg2 (209.385.347) 1389 TB:846
18/44 3:05 +9.02 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (258.907.534) 1392 TB:876
18/44 3:16 +9.02 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (273.647.229) 1395
TB:1.020
19/47 4:07 +9.42++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (343.358.380) 1385
TB:1.157
19/48 5:00 +10.00 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (413.337.998) 1377
TB:1.426
19/48 5:22 +10.00 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 Kc7 14.b5 (441.759.137) 1369
TB:2.409
20/51 7:42 +10.40++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 h4 6.Kg2 g4 7.Kg1 h3 8.Kh2 f3
9.Kg3 f2 10.Kxf2 h2 11.Kg2 g3 12.Kh1 Kc6
13.a6 g2+ 14.Kxg2 (624.476.293) 1349
TB:2.780
20/51 9:14 +10.43 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.c6 Kxc6 7.Kg2 Kb7 8.Kh2 Kc7
9.a6 f3 10.a7 h4 11.a8D Kd6 12.Dg8 f2
13.Dg6+ Ke5 14.Dh5+ (751.436.686) 1355
TB:2.833
20/51 11:00 +10.43 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.c6 Kxc6 7.Kg2 Kb7 8.Kh2 Kc7
9.a6 f3 10.a7 h4 11.a8D Kd6 12.Dg8 f2
13.Dg6+ Ke5 14.Dh5+ (899.814.574) 1363
TB:3.220
21/51 15:11 +10.83++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 Kxb4
9.c6 g3+ 10.Kxf3 h3 11.c7 g2 12.Kf2 Kc4
13.c8D+ Kd4 (1.221.205.846) 1339
TB:4.054
21/51 19:11 +11.83++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 Kxb4
9.c6 g3+ 10.Kxf3 h3 11.c7 g2 12.Kf2 Kc5
13.c8D+ Kd6 14.Dxh3 (1.539.733.904) 1337
TB:4.194
21/53 24:00 +12.28 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kh1 (1.934.441.947) 1342
TB:4.518
21/53 25:44 +12.28 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kh1 (2.084.287.192) 1349
TB:5.363
22/55 37:11 +12.29 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.a6 Kd3 12.a7 f2
13.a8D f1S+ 14.Kh1 (2.980.479.563) 1335
TB:7.607
22/57 40:21 +12.29 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.a6 Kd3 12.a7 f2
13.a8D f1S+ 14.Kh1 (3.247.960.144) 1341
TB:10.706
23/57 60:27 +12.69++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kg1 (508.259.727) 140
TB:14.169
23/57 75:30 +13.69++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D g3+ 14.Kxg3 (1.696.508.173) 374
TB:15.778
23/57 92:53 +14.28 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1D 14.Da6+ (3.098.475.019) 555
TB:18.321
23/57 101:03 +14.28 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1D 14.Da6+ (3.793.689.358) 625
TB:22.586
24/59 144:49 +14.68++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1D 14.Da6+ (2.928.641.660) 337
TB:24.161
24/59 179:42 +15.68++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kg1 (1.405.724.467) 130
TB:25.579
24/59 224:19 +17.30 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kg1 (763.565.518) 56
TB:27.812
24/59 240:25 +17.30 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1S+ 14.Kg1 (2.166.242.315) 150
TB:31.304
25/61 356:24 +17.70++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D g3+ 14.Kxg3 (2.777.099.301) 129
TB:35.885
25/63 453:01 +18.70++ 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.c6 Kd3 12.c7 f2
13.c8D f1D 14.Da6+ (2.001.890.659) 73
TB:38.656
25/63 598:42 +19.69 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.a6 Kd3 12.a7 f2
13.a8D f1S+ 14.Kg1 (836.349.107) 23
TB:46.811
25/63 639:30 +19.69 1.a5 Ka6 2.Kg2 f4 3.c5 Kb5 4.Kf3 g5
5.Kf2 g4 6.Kg2 f3+ 7.Kg3 h4+ 8.Kf2 h3
9.Kg3 h2 10.Kxh2 Kc4 11.a6 Kd3 12.a7 f2
13.a8D f1S+ 14.Kg1 (31.419.831) 0
TB:58.693
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.