Costeff Study 1979

[afzzq]

Here is an earlier version of the Costeff study:
[d]8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1

Yace pb 2003 quickly finds 1Ra1!, but for some reason Stockfish didn't find it, at least not for a while (no tablebases were used).

The winning line here is 1 Ra1! d5 2 c6 d4 3 c7 d3 4 c8B! d2 5 Bg4 d1Q 6 B:d1 Nh3 7 Bc2+ Ng1 8Bb1 Nf3 9 Be4+ Ng1 10 Ra2 1-0.

[GARGAMEL]

Hello

here the results from Deep Fritz 10:

Costeff,G - _, Ta1 1979
8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1


1.Tc1 d5 2.c6
+- (12.24) Tiefe: 5/15 00:00:00 1kN
+- (11.62) Tiefe: 7/25 00:00:01 67kN
1.Kg7 d5 2.c6 d4 3.c7 d3 4.c8D d2 5.Dh8 d1D 6.Txd1
+- (12.81) Tiefe: 7/25 00:00:01 70kN
= (0.00) Tiefe: 17/42 00:00:03 3809kN, tb=959
1.Tc1
= (0.01) Tiefe: 17/42 00:00:03 3865kN, tb=960
+/= (0.51) Tiefe: 17/42 00:00:03 3881kN, tb=960
1.Ta1 d5 2.c6 d4 3.c7 d3 4.c8L d2 5.Lg4 d1D 6.Lxd1 Sh3 7.Lc2+ Sg1 8.Le4
+/- (0.85) Tiefe: 17/42 00:00:03 5081kN, tb=1026
+- (6.81) Tiefe: 17/42 00:00:03 5710kN, tb=1036
1.Td1 d5 2.c6 d4
+- (6.82) Tiefe: 17/42 00:00:03 6029kN, tb=1129
+- (7.25) Tiefe: 17/42 00:00:04 6113kN, tb=1164
1.Kh7 d5 2.c6 d4 3.c7 d3 4.c8D d2 5.Dd8 d1D 6.Db6 Dxb1+ 7.Dxb1
+- (8.55) Tiefe: 17/42 00:00:04 6456kN, tb=1323
= (0.00) Tiefe: 18/38 00:00:05 10529kN, tb=2129
1.c6 dxc6 2.Kg7 c5
+/= (0.34) Tiefe: 18/38 00:00:08 21436kN, tb=3993
+- (1.49) Tiefe: 18/38 00:00:08 21795kN, tb=4402
1.Td1 d5 2.c6 d4 3.c7 d3 4.c8D d2 5.Txd2 Sf3 6.Tf2 g1D 7.Txf3 Dd1 8.Tf5 Dd6+ 9.Kh7 De7+ 10.Kg8 De3 11.Dc6+ Kg1 12.Th5 Dg3+
+- (1.51) Tiefe: 18/38 00:00:08 21796kN, tb=4402
+- (1.66) Tiefe: 19/45 00:00:10 27307kN, tb=6090
1.Kh5 d5 2.c6 d4
+- (1.66) Tiefe: 19/45 00:00:10 27906kN, tb=6202
+- (3.72) Tiefe: 19/45 00:00:11 28502kN, tb=6301
1.Ta1! d5 2.c6 d4 3.c7
+- (3.75) Tiefe: 19/45 00:00:11 29749kN, tb=6475
+- (10.61) Tiefe: 26/61 00:02:23 556mN, tb=188422

regards Anton

[metax]

[D]8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1

Analysis by ChessMind 0.82:

1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Qc3 Nxd2 7.Qxd2
+- (8.61) Depth: 13/22 00:00:01 545kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Qc3 Nxd2 7.Qxd2
+- (8.61) Depth: 13/24 00:00:02 678kN
1.Rd1 d5
+- (8.01 --) Depth: 14/24 00:00:02 755kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kh3 8.Kg7
+- (7.12) Depth: 14/26 00:00:03 1059kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kh3 8.Kg7
+- (7.12) Depth: 14/26 00:00:03 1220kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qg6+
+- (6.96) Depth: 15/26 00:00:03 1335kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qg6+
+- (6.96) Depth: 15/28 00:00:04 1656kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qg6+ Kf2
+- (6.91) Depth: 16/30 00:00:05 1838kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qg6+ Kf2
+- (6.91) Depth: 16/30 00:00:06 2264kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qb1 Kf2 9.Qb2+ Kg3
+- (6.82) Depth: 17/30 00:00:07 2516kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kg3 8.Qb1 Kf2 9.Qb2+ Kg3
+- (6.82) Depth: 17/30 00:00:08 3118kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kf1 8.Qb1+ Kg2 9.Qb2+ Kh3 10.Qa1 Kg3
+- (6.79) Depth: 18/32 00:00:09 3565kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kf1 8.Qb1+ Kg2 9.Qb2+ Kh3 10.Qa1 Kg3
+- (6.79) Depth: 18/33 00:00:12 4499kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kf1 8.Qb1+ Kg2 9.Qb2+ Kg3 10.Qa1 Kh3
+- (6.63) Depth: 19/35 00:00:15 5454kN
1.Rd1 d5 2.c6 d4 3.c7 d3 4.c8Q d2 5.Rxd2 Nf3 6.Rxg2 Kxg2 7.Qc2+ Kf1 8.Qb1+ Kg2 9.Qb2+ Kg3 10.Qa1 Kh3
+- (6.63) Depth: 19/41 00:00:19 7136kN
1.Rd1 d5
+- (6.03 --) Depth: 20/41 00:00:25 8975kN
1.Ra1
+- (6.34 ++) Depth: 20/41 00:00:28 9926kN
1.Ra1
+- (6.84 ++) Depth: 20/41 00:00:28 10009kN
1.Ra1
+- (7.67 ++) Depth: 20/41 00:00:29 10474kN
1.Ra1
+- (8.25) Depth: 20/41 00:00:30 10669kN
1.Ra1
+- (8.25) Depth: 20/41 00:00:33 11809kN
1.Ra1
+- (8.55 ++) Depth: 21/42 00:00:36 12878kN
1.Ra1 d5 2.c6 d4 3.c7 d3 4.c8B d2 5.Bg4 d1Q 6.Bxd1 Nh3 7.Bc2+ Ng1 8.Bb1 Nf3 9.Be4+ Ng1 10.Ra2 Nh3 11.Rxg2 Nf2
+- (8.61) Depth: 21/42 00:00:37 13419kN
1.Ra1 d5 2.c6 d4 3.c7 d3 4.c8B d2 5.Bg4 d1Q 6.Bxd1 Nh3 7.Bc2+ Ng1 8.Bb1 Nf3 9.Be4+ Ng1 10.Ra2 Nh3 11.Rxg2 Nf2
+- (8.61) Depth: 21/42 00:00:52 18607kN

[zullil]

Here is an earlier version of the Costeff study:
[d]8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1

Yace pb 2003 quickly finds 1Ra1!, but for some reason Stockfish didn't find it, at least not for a while (no tablebases were used).

The winning line here is 1 Ra1! d5 2 c6 d4 3 c7 d3 4 c8B! d2 5 Bg4 d1Q 6 B:d1 Nh3 7 Bc2+ Ng1 8Bb1 Nf3 9 Be4+ Ng1 10 Ra2 1-0.

Stockfish-1.7.1 (8 threads) figures it out, but not quickly. Only at depth 40 does it abandon Rd1, and then it very quickly finds the correct path:

Code: Select all

info depth 40 score cp 56 upperbound time 6718002 nodes 63653502739 nps 9475064 pv b1d1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8q d3d2 d1d2 
info currmove h6h5 currmovenumber 2
info nodes 63654794723 nps 9475065 time 6718138 hashfull 840
info nodes 63664087211 nps 9475029 time 6719144 hashfull 842
info nodes 63672850421 nps 9474922 time 6720145 hashfull 844
info nodes 63682274483 nps 9474880 time 6721169 hashfull 847
info currmove b1b3 currmovenumber 3
info currmove h6g6 currmovenumber 4
info currmove h6g7 currmovenumber 5
info nodes 63690382616 nps 9474653 time 6722186 hashfull 849
info currmove b1a1 currmovenumber 6
info depth 40 score cp 1026 lowerbound time 6722912 nodes 63695228255 nps 9474351 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info depth 40 score cp 6186 lowerbound time 6723054 nodes 63695471978 nps 9474187 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info depth 40 score cp 6186 lowerbound time 6723169 nodes 63695538120 nps 9474034 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info nodes 63695559667 nps 9473967 time 6723219 hashfull 851
info depth 40 score cp 6186 lowerbound time 6723324 nodes 63695612869 nps 9473827 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info depth 40 score cp 6186 lowerbound time 6723449 nodes 63695688987 nps 9473662 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info depth 40 score cp 7038 lowerbound time 6723633 nodes 63696023372 nps 9473453 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 
info depth 40 score cp 13244 lowerbound time 6724135 nodes 63699668716 nps 9473288 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 e4g2 h1g1 g2h3 g1f2 g3g2 f2e3 g2h2 e3d4 h6g5 d4c5 h2d2 c5c4 h3f5 c4c5 g5f4 c5b4 f4e5 b4a5 d2a2 a5b6 f5h3 b6b7 a2c2 b7a8 e5d4 a8a7 d4d5 a7b8 c2h2 b8b7 d5e5 b7c7 e5e6 c7c6 h2c2 c6b7 e6d5 b7a7 c2b2 a7a6 d5c5 a6a7 c5d5 

[Houdini]

Here is an earlier version of the Costeff study:
[d]8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1

Yace pb 2003 quickly finds 1Ra1!, but for some reason Stockfish didn't find it, at least not for a while (no tablebases were used).

The winning line here is 1 Ra1! d5 2 c6 d4 3 c7 d3 4 c8B! d2 5 Bg4 d1Q 6 B:d1 Nh3 7 Bc2+ Ng1 8Bb1 Nf3 9 Be4+ Ng1 10 Ra2 1-0.

Houdini finds at depth 26 that it's mate in 19:
26 +99.63 104.0M Ra1 d5 c6 d4 c7 d3 c8=B d2 Bg4 d1=R Bxd1 Nh3 Bc2+ Ng1 Bb1 Nf3 Be4+ Ng1 Ra2 Nh3 Rxg2 Nf4 Rg3+ Ng2 Kg5 Kg1 Rxg2+ Kf1 Rxh2 Kg1 Rd2 Kf1 Kf4 Kg1 Ke3 Kf1 Rd1#

[zullil]

Here is an earlier version of the Costeff study:
[d]8/3p4/7K/2P5/8/8/6pp/1R4nk w - - 0 1

Yace pb 2003 quickly finds 1Ra1!, but for some reason Stockfish didn't find it, at least not for a while (no tablebases were used).

The winning line here is 1 Ra1! d5 2 c6 d4 3 c7 d3 4 c8B! d2 5 Bg4 d1Q 6 B:d1 Nh3 7 Bc2+ Ng1 8Bb1 Nf3 9 Be4+ Ng1 10 Ra2 1-0.

Houdini finds at depth 26 that it's mate in 19:
26 +99.63 104.0M Ra1 d5 c6 d4 c7 d3 c8=B d2 Bg4 d1=R Bxd1 Nh3 Bc2+ Ng1 Bb1 Nf3 Be4+ Ng1 Ra2 Nh3 Rxg2 Nf4 Rg3+ Ng2 Kg5 Kg1 Rxg2+ Kf1 Rxh2 Kg1 Rd2 Kf1 Kf4 Kg1 Ke3 Kf1 Rd1#

Impressive. Stockfish also finds mate in 19, but takes much longer:

Code: Select all

info depth 40 score mate 19 time 12393270 nodes 116326703680 nps 9386280 pv b1a1 d7d5 c5c6 d5d4 c6c7 d4d3 c7c8b d3d2 c8g4 d2d1n g4d1 g1h3 d1c2 h3g1 c2b1 g1e2 b1e4 e2g1 a1a2 g1h3 a2g2 h3f4 g2g3 f4g2 h6g5 h1g1 g3g2 g1f1 g2h2 f1g1 h2a2 g1f1 g5f4 f1g1 f4e3 g1f1 a2a1