Hard positions posted for 6 last moonths

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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

I took all the positions posted in this thread, I let 4 SF-mod solved them.
I selected the hardest positions (still 38) :

Code: Select all

1b2r1r1/5p1k/3pb1pB/2pnP1Q1/q2P1N2/p1P5/1p3PP1/1R2R1K1 w - - bm Re4;                    
1k5r/pbq2p2/4pP2/p1P3P1/5P1r/2p1Q3/P3B1P1/3R1RK1 w - - bm Rb1;                          
1k6/6Bq/b6p/2p2p2/1pPp3r/pP1Pb3/P1K3Q1/6Rr w - - bm Be5+;                               
1qrr1b2/6p1/ppkn1P2/3pP3/1PP5/2BP1pP1/BQ3P2/1RRN1n1K b - - bm Be7;                      
2b2rk1/3nbppp/1q2p3/n2pP3/p1pP1PN1/prP2N1P/2BB2PK/1R2QR2 w - - bm Bxh7+;                
2b2rk1/N1p3b1/p2p1n2/2PPp1q1/2B1Pn1p/PrN2P2/5RPB/R1Q4K b - - bm N6h5;                   
2b5/1pr4p/3bp1pk/1p6/1PpN2PP/K1P1n3/P3N1R1/3R4 w - - bm Nxb5
2k5/1p3pp1/p1p1p1p1/2P1P1P1/PP1P1P1P/K7/8/8 w - - bm f5;                                
2k5/8/1p2q1p1/1P1p2r1/p1pP1p1p/P1P1pPP1/4P1BP/4N1RK w - - bm Bh3;                       
2r3k1/1r3ppp/q1p1p3/2P1RP1P/b1pP2P1/P1n5/1P6/KBQ3R1 w - - bm f6;                        
2rq1rk1/3bbpp1/3np3/2ppB1PQ/p1p2P2/1PP1P1N1/P6P/R4RK1 w - - bm Rf3;                     
3rr1bk/6np/2p1n3/1pPpNpPp/pP1QpP1P/P2PP3/2K5/B7 w - - bm Ng6+;                                         
4B3/k1K1pp2/p3bq2/2p1p3/1p2P1P1/4P2Q/nR6/8 w - - bm g5
4N2k/4PB1p/7P/2p5/2P5/2rq2Pp/1P3P1K/8 w - - bm Nc7
5N1n/3P1p1p/5P1k/1Pp1P2p/4KP1P/2p5/p4b2/5N2 w - - bm Ne3;                               
5rqk/4R2p/5Pp1/1p4P1/4Q3/2p3P1/6K1/8 w - - bm Qe5 Qc6 Qb7 Kg1;                                         
6k1/1b2rr1p/4R1pP/3p1pP1/p1pPpK2/PpP5/1P6/2B3N1 b - - bm e3;                                           
6r1/2kn1p2/2b1pp1p/2p4P/p1P1PKP1/3N1P2/3R4/6R1 w - - bm e5;                             
7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - bm Rxc3 Nf4;                                                                                                    
8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - bm a4;                                       
8/5pkp/1p6/p4p2/3P4/B5rP/1R6/7K w - - bm Rg2;                                                          
8/b4kp1/2p1p3/5pB1/p1PP4/1p6/3K1P2/3N4 w - - bm Kc3
8/b7/3p2b1/5p1n/5Pk1/4P1p1/B5P1/R4K2 w - - bm Ke2
8/q1p1N1p1/3p1p1p/pk5P/1p2BB2/8/PK3P2/8 w - - bm Be3
8/r4b2/3p2k1/p1pPpR2/PpP1P3/1P3Pp1/6KP/8 w - - bm Rxf7;                                                
b1r1r3/b1q2ppk/1p2pP1p/2Pp3Q/p2Nn3/3R4/1B4PP/5RK1 w - - bm Bc1;                                        
b4rk1/6np/3p1pp1/1r2p1PP/1p2P3/1PqN1P2/2P3RQ/1KBR4 b - - bm Bxe4;                                      
k1b5/1p1p4/p1bP4/PP6/8/6N1/8/K7 w - - bm b6;                                            
k7/P4pp1/1P6/2p1P3/2P1n3/p5pB/P4n2/K5b1 w - - bm e6;                                    
r1N2r2/2R2p2/5Rp1/p1P4p/2Kn1P1k/1P6/8/8 w - - bm Kxd4;                                                 
r1b2rk1/1pqnbp1p/p3p1p1/4n1N1/3B4/PN1B2Q1/2P3PP/3R1R1K w - - bm Nc5;                                   
r1b3r1/b4p1k/P1p5/Pp2p1q1/4Pp1p/2PN3P/4QPPK/RR3B2 b - - bm Bxh3;                                       
r2b4/1r5k/2p1p1p1/1pPpPpPp/pQ1P1P1P/1bP3KB/8/1N6 b - - bm a3;                                          
r2bbrk1/1q4pn/2np1p1p/2pNpP2/ppP1P1PP/3P1BQ1/PP1BNR2/R5K1 w - - bm Kh1;                 
r3kb1r/1p4pp/2q1pp2/1p2Q3/8/2P5/PP2B1PP/R4R1K w kq - bm Rxf6;                           
r4rk1/1pp2ppp/2n5/p1b1p3/2N1P3/1BP1Bq2/PPQ2P1K/R4R2 b - - bm Ra6;                       
rn3rk1/4bpp1/1qp4p/pp1nP3/2pP1B1N/P1N2BPb/1P5P/1R1Q1R1K w - - bm Bxh6;                                 
rnbqk2r/pp1p1ppp/3P1n2/b1p5/8/2N2N2/PP2PPPP/R1BQKB1R w KQkq - bm e4;
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

For these 38 positions, 30 minutes search with 1 core with 6 engines.
Timing in seconds in the table to find the solution. Empty space means "not found".

Code: Select all

  Solution		Corchess-NNUE-1.3 Crystal3.1	SugaR.AI.ICCF.1	CF_EXT_281220	ShashChess15.1   Bluefish-12-W		#found		AVG time
-------------------------------------------------------------------------------------------------------------------------------------------------------
 1) Re1-e4             		426		1		0		401		49		663		6		257
 2) Rd1-b1             		1260		838		711		978				261		5		810
 3) Bg7-e5             				112		413		489		1505				4		630
 4) .. Bf8-e7          		1428		7		122				598				4		539
 5) Bc2xh7             		481		32		9		221		300		1103		6		358
 6) .. Nf6-h5          		20		6		15		299		216		438		6		166
 7) Nd4xb5             												1379		1		1379
 8) f4-f5              												1650		1		1650
 9) Bg2-h3             		530		166		247		305		449		995		6		449
10) f5-f6              		101		1		1		342		599		112		6		193
11) Rf1-f3             				95		20		621		207				4		236
12) Ne5-g6             				118		487								2		303
13) g4-g5              		0		265		77		0		0		0		6		57
14) Ne8-c7             		590		1587		1196				587		68		5		806
15) Nf1-e3             		199		127		296		931		28		125		6		284
16) Qe4-e5, Qe4-c6, Qe4		408		29		55		211		425		364		6		249
17) .. e4-e3           				0		0								2		0
18) e4-e5              				35		9		200		184				4		107
19) Ra3xc3															0		#DIV/0 !
20) .. a5-a4           		335		1568		801		247		637		716		6		717
21) Rb2-g2             		270		166		176		544		542		217		6		319
22) Kd2-c3             		74		9		57				46		37		5		45
23) Kf1-e2             		90		860		1465		534		151		61		6		527
24) Bf4-e3             		0		70		308		0				64		5		88
25) Rf5xf7             				395										1		395
26) Bb2-c1             		226		46		49				804		1162		5		457
27) .. Ba8xe4          		265		3		0		1639		16		636		6		427
28) b5-b6              		84						31		58		33		4		52
29) e5-e6              												289		1		289
30) Kc4xd4             		463		1137				309		646		226		5		556
31) Nb3-c5             		79		1		0		434				344		5		172
32) .. Bc8xh3          										796		516		2		656
33) .. a4-a3           				124								771		2		448
34) Kg1-h1             						63						8		2		36
35) Rf1xf6             										112				1		112
36) .. Ra8-a6          		12		724		426		33		4		456		6		276
37) Bf4xh6             		216		0		3								3		73
38) e2-e4              		299		6		25		358		679		10		6		230
------------------------------------------------------------------------------------------------------------------------------------------------------
#found				24		30		28		22		25		28		157
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

I add this position 1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - bm Nfd5;
From here http://talkchess.com/forum3/viewtopic.p ... 85#p879685

+ correction of a glitch :
Nf4 is not a solution here : 7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - bm Rxc3 Nf4;
Correct is 7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - bm Rxc3;
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

Latest set (39 positions) :

Code: Select all

1b2r1r1/5p1k/3pb1pB/2pnP1Q1/q2P1N2/p1P5/1p3PP1/1R2R1K1 w - - bm Re4;                    
1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - bm Nfd5;
1k5r/pbq2p2/4pP2/p1P3P1/5P1r/2p1Q3/P3B1P1/3R1RK1 w - - bm Rb1;                          
1k6/6Bq/b6p/2p2p2/1pPp3r/pP1Pb3/P1K3Q1/6Rr w - - bm Be5+;                               
1qrr1b2/6p1/ppkn1P2/3pP3/1PP5/2BP1pP1/BQ3P2/1RRN1n1K b - - bm Be7;                      
2b2rk1/3nbppp/1q2p3/n2pP3/p1pP1PN1/prP2N1P/2BB2PK/1R2QR2 w - - bm Bxh7+;                
2b2rk1/N1p3b1/p2p1n2/2PPp1q1/2B1Pn1p/PrN2P2/5RPB/R1Q4K b - - bm N6h5;                   
2b5/1pr4p/3bp1pk/1p6/1PpN2PP/K1P1n3/P3N1R1/3R4 w - - bm Nxb5
2k5/1p3pp1/p1p1p1p1/2P1P1P1/PP1P1P1P/K7/8/8 w - - bm f5;                                
2k5/8/1p2q1p1/1P1p2r1/p1pP1p1p/P1P1pPP1/4P1BP/4N1RK w - - bm Bh3;                       
2r3k1/1r3ppp/q1p1p3/2P1RP1P/b1pP2P1/P1n5/1P6/KBQ3R1 w - - bm f6;                        
2rq1rk1/3bbpp1/3np3/2ppB1PQ/p1p2P2/1PP1P1N1/P6P/R4RK1 w - - bm Rf3;                     
3rr1bk/6np/2p1n3/1pPpNpPp/pP1QpP1P/P2PP3/2K5/B7 w - - bm Ng6+;                                         
4B3/k1K1pp2/p3bq2/2p1p3/1p2P1P1/4P2Q/nR6/8 w - - bm g5
4N2k/4PB1p/7P/2p5/2P5/2rq2Pp/1P3P1K/8 w - - bm Nc7
5N1n/3P1p1p/5P1k/1Pp1P2p/4KP1P/2p5/p4b2/5N2 w - - bm Ne3;                               
5rqk/4R2p/5Pp1/1p4P1/4Q3/2p3P1/6K1/8 w - - bm Qe5 Qc6 Qb7 Kg1;                                         
6k1/1b2rr1p/4R1pP/3p1pP1/p1pPpK2/PpP5/1P6/2B3N1 b - - bm e3;                                           
6r1/2kn1p2/2b1pp1p/2p4P/p1P1PKP1/3N1P2/3R4/6R1 w - - bm e5;                             
7k/pp1pBp1N/1p3Pp1/b3K1PR/P3P2p/R1n4P/2P1N1P1/3q4 w - - bm Rxc3;                                                                                                    
8/1p6/4k1pp/p1p1p3/4P3/1PP4K/P2P3P/8 b - - bm a4;                                       
8/5pkp/1p6/p4p2/3P4/B5rP/1R6/7K w - - bm Rg2;                                                          
8/b4kp1/2p1p3/5pB1/p1PP4/1p6/3K1P2/3N4 w - - bm Kc3
8/b7/3p2b1/5p1n/5Pk1/4P1p1/B5P1/R4K2 w - - bm Ke2
8/q1p1N1p1/3p1p1p/pk5P/1p2BB2/8/PK3P2/8 w - - bm Be3
8/r4b2/3p2k1/p1pPpR2/PpP1P3/1P3Pp1/6KP/8 w - - bm Rxf7;                                                
b1r1r3/b1q2ppk/1p2pP1p/2Pp3Q/p2Nn3/3R4/1B4PP/5RK1 w - - bm Bc1;                                        
b4rk1/6np/3p1pp1/1r2p1PP/1p2P3/1PqN1P2/2P3RQ/1KBR4 b - - bm Bxe4;                                      
k1b5/1p1p4/p1bP4/PP6/8/6N1/8/K7 w - - bm b6;                                            
k7/P4pp1/1P6/2p1P3/2P1n3/p5pB/P4n2/K5b1 w - - bm e6;                                    
r1N2r2/2R2p2/5Rp1/p1P4p/2Kn1P1k/1P6/8/8 w - - bm Kxd4;                                                 
r1b2rk1/1pqnbp1p/p3p1p1/4n1N1/3B4/PN1B2Q1/2P3PP/3R1R1K w - - bm Nc5;                                   
r1b3r1/b4p1k/P1p5/Pp2p1q1/4Pp1p/2PN3P/4QPPK/RR3B2 b - - bm Bxh3;                                       
r2b4/1r5k/2p1p1p1/1pPpPpPp/pQ1P1P1P/1bP3KB/8/1N6 b - - bm a3;                                          
r2bbrk1/1q4pn/2np1p1p/2pNpP2/ppP1P1PP/3P1BQ1/PP1BNR2/R5K1 w - - bm Kh1;                 
r3kb1r/1p4pp/2q1pp2/1p2Q3/8/2P5/PP2B1PP/R4R1K w kq - bm Rxf6;                           
r4rk1/1pp2ppp/2n5/p1b1p3/2N1P3/1BP1Bq2/PPQ2P1K/R4R2 b - - bm Ra6;                       
rn3rk1/4bpp1/1qp4p/pp1nP3/2pP1B1N/P1N2BPb/1P5P/1R1Q1R1K w - - bm Bxh6;                                 
rnbqk2r/pp1p1ppp/3P1n2/b1p5/8/2N2N2/PP2PPPP/R1BQKB1R w KQkq - bm e4;
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Jouni
Posts: 3651
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Hard positions posted for 6 last moonths

Post by Jouni »

Interestingly with 1 minute level and GTX card Lc0 solves 22/39 positions and SF12 only 14 with 6 cores. Crystal is not much better than Lc0. Also in Hard-Talkchess-2020 suite Lc0 beats SF12 easily. Normally SF12 is tactically superior so these are not tactical positions at all? Collection of weird/odd/trivia/exception positions?
Jouni
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

1 more position from here : http://talkchess.com/forum3/viewtopic.p ... 41#p882041
Not easy for Crystal 3.1

8/N3q2p/p3N3/1P1P3P/8/4k1K1/1P6/4B3 w - - bm Bf2;
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

1 more from "Der brillante Schachzug 019", source : Randviir 1990

1k3q2/pp2n1pP/2PK4/2pR1b2/8/6Q1/8/8 w - - bm Rxf5;

1. Rxf5 Nxf5+ 2. Kd7+ Ka8 3. Qb8+!!!

Crystal 3.1 has trouble here.
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

An interesting mate :

B7/1r3r2/3nn3/p1p1pp1N/2Ppkp1P/P2Np2K/1p2P1P1/bR6 w - - bm a4;

Code: Select all

+M14	1.a4 Rf8 2.Kh2 Rff7 3.Kg1 Rf8 4.Kf1 Rff7 5.Ke1 Rf8 6.Kd1 Rff7 7.Kc2 Ne8 8.Rf1 Rfc7 9.Kb1 Rf7 10.Rf3 Nd6 11.g3 Rf8 12.gxf4 exf4 13.Rxf4+ Nxf4 14.Ng3+
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Paloma
Posts: 1208
Joined: Thu Dec 25, 2008 9:07 pm
Full name: Herbert L

Re: Hard positions posted for 6 last moonths

Post by Paloma »

What is the source of this Position ?
Not from here: Hard positions posted for 6 last moonths :wink:
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Vinvin
Posts: 5298
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Hard positions posted for 6 last moonths

Post by Vinvin »

Paloma wrote: ↑Sun Feb 14, 2021 4:17 am What is the source of this Position ?
Not from here: Hard positions posted for 6 last moonths :wink:
There are positions I posted directly in this thread.
Sources :
https://www.schachfeld.de/threads/21200-matt-in-14
http://rebel13.nl/rebel13/hard.html
https://forum.computerschach.de/renderc ... 0w%20-%20-
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