Questionable positions in the Hard-Talkchess-2020 set

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Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Tue Dec 01, 2020 1:08 am

Over the 10 past months I saw about 12 positions challenged in different threads.
I don't keep track of them. Let group them here.
So, please repost the positions here to discuss in details.
The id numbers would be useful, see here : http://talkchess.com/forum3/viewtopic.php?p=827072.

Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Wed Dec 30, 2020 4:30 am

Latest review of the set I did with the help of SugaR.AI.ICCF.1.00 :

#18) Be1-d2 -> sometimes this move is found by luck especially with short time control/low depth. Random behavior.
1r3rk1/5p1p/1qb1pPp1/3pP3/p1pP4/PpP2N1R/1Pn1B2P/3RB2K w - - bm Bd2; id "Hard-Talkchess-2020.018" ;

#33) Nf7-d6 -> very hard. Only Sting-SF finds it, may be sometimes found by luck ? Random behavior.
2b1r3/r2ppN2/8/1p1p1k2/pP1P4/2P3R1/PP3PP1/2K5 w - - bm Nd6+; id "Hard-Talkchess-2020.033" ;

#51) b4-b5 -> may be Qf3 is equal in eval. Wrong solution ?
2r3k1/2b1Rpp1/p2p2qp/P7/1PpB4/2P3PP/5Q1K/8 w - - bm b5; id "Hard-Talkchess-2020.051" ;

#76) .. Rh7xh4 -> may be Bf2+ is equivalent (draw). Wrong solution ?
4knQ1/7r/3p2p1/2bP1pP1/5P1N/6K1/8/8 b - - bm Rxh4; id "Hard-Talkchess-2020.076" ;

#102) h5xg6 -> very deep. Sometimes found by luck ? Random behavior.
7q/b1p5/1p1Npkb1/pPP2ppP/P1P5/3B2P1/5P1R/K3R3 w - - bm hxg6; id "Hard-Talkchess-2020.102" ;

#138) Qh4-d4 -> Sometimes found by luck (several moves at 0.00). Random behavior.
q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - bm Qd4+; id "Hard-Talkchess-2020.138" ;

#176) d5-d6 -> e4 is very close in eval. Wrong solution ?
r2qr1k1/pp1bbp2/n5p1/2pPp2p/8/P2PP1PP/1P2N1BK/R1BQ1R2 w - - bm d6; id "Hard-Talkchess-2020.176" ;

Note on #204) Bc1-g5 -> This one is correct for me. I received a lot of critics because b4 is close. But not close enough for me : b4=1.80 and Bg5=2.80
rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - bm Bg5; id "Hard-Talkchess-2020.204" ;

Ferdy
Posts: 4527
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Location: Philippines

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Ferdy » Wed Dec 30, 2020 6:49 am

Vinvin wrote:
Wed Dec 30, 2020 4:30 am
Note on #204) Bc1-g5 -> This one is correct for me. I received a lot of critics because b4 is close. But not close enough for me : b4=1.80 and Bg5=2.80
rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - bm Bg5; id "Hard-Talkchess-2020.204" ;
A quick look with IDEA at 10s/pos using SF 2020-12-25, stronger than SF12.



Image

b4 is seen by Lc0 in my test at 2m/pos

Code: Select all

203) g2-g3              g2-g3   * 0 Seconds
204) Bc1-g5             b2-b4    
205) Rd1-g1             Rd1-g1  * 0 Seconds
206) Rf1-f6             Rf1-f6  * 0 Seconds
207) .. Ne4-d6          Ne4-d6  * 6 Seconds

Dann Corbit
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Location: Redmond, WA USA
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Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Dann Corbit » Wed Dec 30, 2020 9:08 am

My data is pretty much in agreement. Here are my database records:
https://drive.google.com/file/d/1Whb2NN ... sp=sharing
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Wed Dec 30, 2020 6:51 pm

Ferdy wrote:
Wed Dec 30, 2020 6:49 am
Vinvin wrote:
Wed Dec 30, 2020 4:30 am
Note on #204) Bc1-g5 -> This one is correct for me. I received a lot of critics because b4 is close. But not close enough for me : b4=1.80 and Bg5=2.80
rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - bm Bg5; id "Hard-Talkchess-2020.204" ;
A quick look with IDEA at 10s/pos using SF 2020-12-25, stronger than SF12.



Image

...
10 seconds is probably not enough to see all the complications in this position.
2 best moves, depth 47, Bg5 is one pawn ahead

Code: Select all

FEN: rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 0 1

Stockfish_20121407_x64_modern:
...
---------------------------------------------------------------------------
 45/64	20:16	6 590 482 087	5 416 254	+2,06	1.b4 d5 2.Nd2 Bd3 3.Nf3 Nd6 4.Bb2 Na6 5.Ne5 Be4 6.Nxc6 Bxg2 7.Kxg2 Ne4 8.Rac1 Rae8 9.f3 Nf6 10.Rxe8 Nxe8 11.Ne5 Nf6 12.Qd4 Qf5 13.g4 Qe6 14.g5 hxg5 15.h6 Kg8 16.Rc6 Qe7 17.Ng4 Nxb4 18.hxg7 Qe2+ 19.Nf2 Nxc6 20.gxf8Q+ Kxf8 21.Qxf6 Qe6 22.Qg7+ Ke7 23.Qxg5+ Kd7 24.Bc3 Ne7 25.a4 Kc8 26.Qg4 Kb7
 45/73	20:16	6 590 482 087	5 416 254	+3,15	1.Bg5 hxg5 2.Nxg5 Qg8 3.Qh4 Re8 4.h6 Bd3 5.Qd4 Na6 6.Qxd7 Rf8 7.Qxd3 gxh6 8.Qxa6 Nc5 9.Qa3 hxg5 10.b4 Ne6 11.b5 c5 12.Bxa8 Rxa8 13.Qf3 Kg7 14.Re5 Rd8 15.Rd1 Rxd1+ 16.Qxd1 Qh7 17.Kg2 Qg6 18.Qf3 Qf6 19.Rd5 Qe7 20.a4 Kg8 21.Re5 Qc7 22.Qd5 Kg7 23.Kg1 Kg8 24.Re4 Qe7 25.Kg2 Kg7 26.Re3 Kg8 27.Re5 Kg7 28.Qf3 Kg8 29.Rd5 Kg7 30.Qd3 Nd4 31.Qe3
---------------------------------------------------------------------------
 46/68	25:56	8 399 933 463	5 396 808	+2,33	1.b4 d5 2.Nd2 Bd3 3.Nf3 a5 4.Ne5 Bf5 5.Qf4 axb4 6.g4 Nd7 7.gxf5 Nxe5 8.Rxe5 Nc5 9.Re3 b3 10.a4 f6 11.a5 Rfd8 12.a6 d4 13.Rg3 d3 14.a7 d2 15.Bxd2 b2 16.Rb1 Rxa7 17.Rxb2 Rad7 18.Qe3 Rd3 19.Qe2 Qxf5 20.Re3 R3d4 21.Bc3 Rg4 22.Rb4 Rg5 23.Kf1 Rxh5 24.Rxb6 Rg5 25.Rxc6 Qb1+ 26.Be1 Rd1 27.Rc8+ Kh7
 46/74	25:56	8 399 933 463	5 396 808	+3,25	1.Bg5 f5 2.Qf4 d5 3.Nf6 gxf6 4.Bxf6+ Rxf6 5.Re8+ Qg8 6.Rxg8+ Kxg8 7.b4 Nd6 8.Qe5 Kg7 9.Qe7+ Nf7 10.Re1 Bc8 11.b5 cxb5 12.Bxd5 Nc6 13.Qc7 Bd7 14.Rc1 Rd8 15.Bxc6 Rxc6 16.Rxc6 Bxc6 17.Qxc6 Rd6 18.Qxb5 f4 19.gxf4 a5 20.Qf5 Kf8 21.Qe4 Rd1+ 22.Kg2 Rd6 23.Qe3 Rc6 24.Kg1 Rf6 25.Kh2 Rd6 26.Qa3 Kg7 27.Qc3+ Kf8 28.Qe3 Rf6 29.Qf3 Ke7 30.Kg1 Kf8 31.Qb7 Rd6 32.Qa8+ Ke7 33.Qe4+ Kf6
---------------------------------------------------------------------------
 47/80	37:29	11 963 256 183	5 317 461	+2,25	1.b4 d5 2.Nd2 Bd3 3.Nf3 Qf5 4.Qh4 Nd7 5.Re7 Nd6 6.Nd4 Nf6 7.Nxf5 Nxf5 8.Qf4 Nxe7 9.Qe3 Bc4 10.Qxe7 Rae8 11.Qxa7 Re1+ 12.Kh2 Ng4+ 13.Kh3 Nxf2+ 14.Kh4 Nd3 15.b5 Re2 16.Bh3 cxb5 17.Qxb6 Re4+ 18.Bf4 Nxf4 19.gxf4 Rxf4+ 20.Kg3 Re4 21.Bd7 Re5 22.Qd6 Rg5+ 23.Kf4 Rg8 24.Bf5 d4 25.a3 Rxh5 26.Rg1 d3 27.Re1 Be6 28.Bxe6 fxe6 29.Rxe6
 47/77	37:29	11 963 256 183	5 317 461	+3,25	1.Bg5 f5 2.Qf4 d5 3.Nf6 gxf6 4.Bxf6+ Rxf6 5.Re8+ Qg8 6.Rxg8+ Kxg8 7.b4 Nd6 8.Qe5 Kg7 9.Qe7+ Nf7 10.Re1 Bc8 11.b5 cxb5 12.Bxd5 Nc6 13.Qc7 Bd7 14.Rc1 Rd8 15.Bxc6 Rxc6 16.Rxc6 Bxc6 17.Qxc6 Rd6 18.Qxb5 f4 19.gxf4 a5 20.Qf5 Kf8 21.Qe4 Rd1+ 22.Kg2 Rd6 23.Qe3 Rc6 24.Kg1 Rf6 25.Kh2 Rd6 26.Qa3 Kg7 27.Qc3+ Kf8 28.Qe3 Rf6 29.Kg1 Rd6 30.Qf3 Rf6 31.Qg4 Nd6 32.Qe2 Nf7 33.Qb2 Rd6 34.Kg2 Ke7

Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Wed Dec 30, 2020 9:26 pm

Vinvin wrote:
Wed Dec 30, 2020 6:51 pm
Ferdy wrote:
Wed Dec 30, 2020 6:49 am
Vinvin wrote:
Wed Dec 30, 2020 4:30 am
Note on #204) Bc1-g5 -> This one is correct for me. I received a lot of critics because b4 is close. But not close enough for me : b4=1.80 and Bg5=2.80
rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - bm Bg5; id "Hard-Talkchess-2020.204" ;
A quick look with IDEA at 10s/pos using SF 2020-12-25, stronger than SF12.



Image

...
10 seconds is probably not enough to see all the complications in this position.
2 best moves, depth 47, Bg5 is one pawn ahead
Depth 56

Code: Select all

Stockfish_20121407_x64_modern:
...
 54/82	2:10:17	39 681 818 729	5 076 015	+2,64	1.b4 d5 2.Nd2 Nd6 3.Qf4 Nc4 4.Bh3 Qg8 5.a4 Nxd2 6.Bxd2 Bc4 7.Bc3 d4 8.Qxd4 f6 9.Qf4 Qf7 10.Bf5 Bd5 11.Bg6 Qd7 12.b5 Qh3 13.f3 Nd7 14.Bf5 Qxh5 15.Bxd7 Bxf3 16.Kf2 Rfd8 17.Re7 Rxd7 18.Rxd7 Bg4 19.Rd2 Qh2+ 20.Ke3 Qh3 21.Rf2 Rc8 22.Kd2 Bh5 23.g4 cxb5 24.Qf3 Rd8+ 25.Kc2 Qxf3 26.Rxf3 Bg6+ 27.Kb2 b4 28.Bxb4 Rd4 29.Kc3 Rxg4 30.Re3 Kh7 31.Bd6 h5 32.Bc7 Rg5 33.Bf4 Rc5+ 34.Kb2 Bf7
 54/83	2:10:17	39 681 818 729	5 076 015	+3,33	1.Bg5 f5 2.Qf4 d5 3.Nf6 gxf6 4.Bxf6+ Rxf6 5.Re8+ Qg8 6.Rxg8+ Kxg8 7.b4 Nd7 8.Qc7 Rd6 9.a4 Ne5 10.b5 cxb5 11.axb5 Bxb5 12.Qxb7 Bc6 13.Qc7 Nf7 14.Rxa7 Rxa7 15.Qxa7 b5 16.Qd4 Bd7 17.Bf3 Bc6 18.Be2 Kf8 19.Kg2 Bd7 20.Bf3 Ke7 21.Bd1 Be6 22.f3 Bd7 23.Kf1 Ng5 24.Bc2 Be6 25.Kg2 Nf7 26.Bd3 Bd7 27.Kf1 Ke6 28.Bc2 Ke7 29.Bb3 Bc6 30.Kg1 Ng5 31.Kg2 Nf7 32.Qh4+ Ke8 33.Qf4 Bd7 34.Kf2 Ke7 35.Qh4+ Ke8 36.Qb4
---------------------------------------------------------------------------
 55/89	3:01:56	55 146 014 741	5 051 781	+2,35	1.b4 d5 2.Nd2 Bd3 3.Nf3 Nd6 4.Bb2 a5 5.Ne5 Be4 6.bxa5 Rxa5 7.f3 Bf5 8.Qb4 c5 9.Qxb6 Ra6 10.Qxc5 Nd7 11.Nxd7 Bxd7 12.Bf1 Rc6 13.Qxd5 Qf5 14.Qxf5 Nxf5 15.Rad1 Be6 16.g4 Nh4 17.Kf2 Bxa2 18.Kg3 Nxf3 19.Kxf3 Bc4 20.Bxc4 Rxc4 21.Rd7 Rb4 22.Bd4 Rb3+ 23.Kf4 Rbb8 24.Ree7 Kg8 25.Kf3 Rbe8 26.Bc5 Rb8 27.Kg3 Rb5 28.Be3 Rbb8 29.Bf4 Rb3+ 30.Kg2 Rb4 31.Kf3 Rb3+ 32.Be3 Rbb8 33.Bc5 Rfc8 34.Bd4 Rf8 35.Be5 Rbe8 36.Bd6 Rd8 37.Bc7 Ra8 38.Kg3 Ra3+ 39.Kf4 Raa8 40.Kf3 Ra7 41.Bd6
 55/77	3:01:56	55 146 014 741	5 051 781	+3,40	1.Bg5 f5 2.Qf4 d5 3.Nf6 gxf6 4.Bxf6+ Rxf6 5.Re8+ Qg8 6.Rxg8+ Kxg8 7.b4 Nd7 8.Qc7 Rd6 9.a4 Ne5 10.b5 cxb5 11.axb5 Bxb5 12.Qxb7 Bc6 13.Qc7 Nf7 14.Rxa7 Rxa7 15.Qxa7 b5 16.f4 Kf8 17.Bf3 Kg7 18.Qc5 Kf6 19.Bd1 Bd7 20.Bb3 Ke6 21.Qa3 Bc6 22.Qa7 Kf6 23.Qc5 Bd7 24.Bxd5 Be6 25.Bg2 Bc4 26.Qb4 Rd3 27.Kh2 Ke6 28.Qb2 Ke7 29.Bh3 Rd5 30.Qc3 Ke6 31.Qe3+ Kf6 32.Bg2 Rd3 33.Qe2 Rb3 34.Qc2 Rd3 35.Bf1 Rd5
---------------------------------------------------------------------------
 56/83	3:12:53	58 448 371 133	5 050 407	+2,63	1.b4 d5 2.Nd2 Bd3 3.Nf3 Nd6 4.Bb2 a5 5.Ne5 Be4 6.bxa5 Rxa5 7.f3 Bf5 8.Qb4 c5 9.Qxb6 Ra6 10.Qxc5 Nd7 11.Nxd7 Bxd7 12.Bf1 Rc6 13.Qxd5 Qf5 14.Qxf5 Nxf5 15.Rad1 Be6 16.g4 Nh4 17.Kf2 Bxa2 18.Kg3 Nxf3 19.Kxf3 Bc4 20.Bxc4 Rxc4 21.Rd7 Rb4 22.Bd4 Rb3+ 23.Kf4 Rbb8 24.Bc5 Rfc8 25.Ba7 Rc4+ 26.Bd4 Kg8 27.Ree7 Rf8 28.Re5 Rfc8 29.Re3 Rb4 30.Rd6 Kh7 31.Re7 Rc2 32.Rd5 Rh2 33.Rxf7
 56/82	3:12:53	58 448 371 133	5 050 407	+3,40	1.Bg5 f5 2.Qf4 d5 3.Nf6 gxf6 4.Bxf6+ Rxf6 5.Re8+ Qg8 6.Rxg8+ Kxg8 7.b4 Nd7 8.Qc7 Rd6 9.a4 Ne5 10.b5 cxb5 11.axb5 Bxb5 12.Qxb7 Bc6 13.Qc7 Nf7 14.Rxa7 Rxa7 15.Qxa7 b5 16.f4 Kf8 17.Bf3 Kg7 18.Qc5 Kf6 19.Bd1 Bd7 20.Bb3 Be6 21.Qxb5 d4 22.Bc2 Bd7 23.Qc5 Be6 24.Bd3 Kg7 25.Qb4 Kf6 26.Qb2 Bd7 27.Qb7 Be6 28.Qb4 Rd8 29.Qb2 Rd6 30.Qa1 Kg7 31.Qa8 Bd7 32.Qa7 Kf6 33.Qc5 Be6 34.Kf2 Bd7 35.Bc2 Be6 36.Qb4 Rd5 37.Qb8 Ke7 38.Qb7+ Kf6 39.Bd3 Rd6 40.Qa7 Bd7 41.Kg1



Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Sun Jan 17, 2021 2:43 am

Some more glitches:

22) g2-g4 -> e6 seems also very strong :

Code: Select all

FEN: 1rb1nrk1/1p1qp2p/p1np1p1Q/3NPp2/2P5/3B1N1P/P2B2P1/R6K w - - 0 1

Crystal3.1-sse4-popcnt:
...
 34/79	05:48	1 676 649 796	4 813 394	+3,00	1.g4 dxe5 2.gxf5 Rf7 3.Qh5 Rg7 4.Bh6 Kh8 5.Bxg7+ Nxg7 6.Qh6 Qe8 7.Nh4 Qf7 8.Ng6+ Kg8 9.Ngxe7+ Nxe7 10.Nxf6+ Kf8 11.Rf1 Ra8 12.Be4 Bxf5 13.Bxf5 Qxc4 14.Rf2 Nexf5 15.Rxf5 Rd8 16.Nh5+ Ke8 17.Rxe5+ Kd7 18.Qxg7+ Kc6 19.Qg2+ Kb6 20.Qf2+ Qd4 21.Re3 Ka7 22.Kg2 Qd5+ 23.Kh2 Qc5 24.Nf4 Ka8 25.Ng2 Qc6 26.Qf4 Qc5 27.Re2 Rf8 28.Qg3 Qd4 29.Re3 Qd2 30.a3 Rf2 31.Rf3 Re2 32.h4
 35/68	05:48	1 676 649 796	4 813 394	+3,40	1.e6 Qxe6 2.g4 Qf7 3.gxf5 Ng7 4.Rg1 Kh8 5.Nh4 Bxf5 6.Ng6+ Bxg6 7.Bxg6 Qg8 8.Bc2 e6 9.Nf4 Ne7 10.Be1 Rbc8 11.Nh5 Rf7 12.Bh4 Nef5 13.Bxf5 exf5 14.Nxg7 Qf8 15.Nxf5 Rxc4 16.Qh5 Rc3 17.Qg4 Rcc7 18.Qg2 d5 19.Bf2 Rg7 20.Nxg7 Rxg7 21.Qxd5 Rxg1+ 22.Kxg1 Qg7+ 23.Kf1 Qc7 24.Kg2 Kg7 25.Qf3 Qd7 26.Be3 Kg6 27.Qe4+ Qf5 28.Qxb7 Qc2+ 29.Kg3 Qxa2


77) Nc4-a5 -> Na5 could be found by luck because at low depth a lot of moves = 0.00

Code: Select all

FEN: 4q1kn/2Bp1p2/1N1PpPp1/1P2P1P1/2N3b1/6p1/1P4Pb/7K w - - 0 1

Crystal3.1-sse4-popcnt:
...
 34/9	00:59	 330 941 687	5 533 494	 0,00	1.Na5 Be2 2.Nb3 Bxb5 3.Nd4 Ba6 4.Nb3
 35/10	00:59	 330 941 687	5 533 494	 0,00	1.Nd2 Qf8 2.Nf3 Bxf3 3.gxf3 Qe8 4.Kg2 Qf8
 35/11	00:59	 330 941 687	5 533 494	 0,00	1.Ne3 Be2 2.Nc2 Qf8 3.Nd4 Bd1 4.Nf3 Qe8 5.Nd4


2 more from http://rybkaforum.net/cgi-bin/rybkaforu ... #pid587919

10) Rd6xf6 -> a lot of moves are crushing

Code: Select all

FEN: 1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - 0 1

Crystal3.1-sse4-popcnt:
...
 26/63	01:36	 563 931 679	5 825 018	+6,63	1.Kg1 b5 2.a5 Kg8 3.Rd1 Qa7 4.Rd2 Kh8 5.Rd3 Kh7 6.Kf1 b4 7.Kg1 Kg8 8.Ba4 b3 9.Rxb3 Nxd7 10.Qe7 Qc7 11.Rd3 Qxa5 12.Bxd7 Qc7 13.Qe5 Qb8 14.Kh2 Kf8 15.Bf5 Qb6 16.Re3 Qd6 17.Rb3 Qxe5 18.fxe5 a5 19.Rb7 a4 20.Ra7
 26/55	01:36	 563 931 679	5 825 018	+7,18	1.Kf1 b5 2.a5 Kg8 3.Rd2 Qa7 4.Kg1 Kh7 5.Rd3 Kg8 6.Rg3 Kh7 7.Re3 b4 8.Rd3 Kg8 9.Ba4 b3 10.Rxb3 Nxd7 11.Qe7 Qc7 12.Rd3 Qxa5 13.Bxd7 Qc7 14.Qe5 Qb8 15.Kh2 Qxe5 16.fxe5 Kf8 17.Bf5 Rxd3 18.Bxd3 a5 19.Bc2 Ke7 20.Kg3 f6 21.f4
 26/54	01:36	 563 931 679	5 825 018	+9,28	1.Kf3 b5 2.Rxf6 Qxe5 3.fxe5 gxf6 4.axb5 axb5 5.Bxb5 fxe5 6.Ke4 f6 7.Kd5 Kg7 8.Ke6 Kf8 9.Kxf6 Ra8 10.Bc6 Rb8 11.Ke6 Rd8 12.Bd5 Rb8 13.Kd6 Rd8 14.f3 Rb8 15.Kc7 Ke7 16.Kxb8 Kxd7 17.Bb3 Kc6 18.Kc8 Kb6 19.f4 e4 20.Kd8 Kc5
 26/61	01:36	 563 931 679	5 825 018	+8,87	1.Qe7 Qc7 2.Qe5 b5 3.axb5 axb5 4.Bxb5 Rg8 5.Qe7 Qd8 6.Qxd8 Rxd8 7.Rc6 Rxd7 8.Rxf6 Rd5 9.Bc6 Rxh5 10.Rxf7 Kg8 11.Ra7 Rf5 12.Ra8+ Kf7 13.Kg3 g5 14.Ra4 Kg7 15.Bf3 Kg8 16.fxg5 hxg5 17.Kg4 Rf7 18.Ra3 Kg7
 26/52	01:36	 563 931 679	5 825 018	+14,93	1.Rxf6 Kg8 2.Rf5 Qxe5 3.Rxe5 Rxd7 4.Re8+ Kh7 5.Bxd7 g6 6.Bc6 Kg7 7.Bd5 Kf6 8.hxg6 fxg6 9.Re6+ Kf7 10.Ba2 Kf8 11.Kg1 Kf7 12.Kh2 h5 13.a5 b5 14.Kh1 Kf8 15.Re5 Kg7 16.Re7+ Kf8 17.Rf7+ Ke8 18.Be6 Kd8 19.Ra7 h4 20.f5 gxf5 21.Rb7 Ke8 22.f4 h3 23.Rd7 Kf8 24.Bxf5 Ke8

26) Ne2-f4 -> Nc5 is also winning may be both moves are a transposition ? I still have to check deeper.

Code: Select all

FEN: 1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - 0 1

Crystal3.1-sse4-popcnt:
...
 25/43	00:27	 139 566 456	5 093 294	+1,75	1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6 4.Nh5 Rbc8 5.Nc5 Rg8 6.Bf4 Qxf4+ 7.Nxf4 Rxc5 8.a3 Rd8 9.Rh2 Re5 10.Ne2 Be4 11.Kd2 Bxd3 12.cxd3 b4 13.d4 Rb5 14.a4 Rd5 15.b3 a5 16.Re3 Rc8 17.g4 Kg8
 25/52	00:27	 139 566 456	5 093 294	+2,09	1.Nc5 Qf5 2.Nf4 Qxe5 3.Bd3 Kg8 4.Rh1 f5 5.Rxh6 Qxe3+ 6.Rxe3 gxh6 7.Be2 Rf7 8.b4 Rg7 9.Kb2 Kh7 10.Ncd3 Bb7 11.g3 Ra8 12.a3 Be4 13.a4 bxa4 14.Nh5 Bxd3 15.Bxd3 Rg6 16.Ka3 Kg8 17.Kxa4 Kf7 18.c4 Rg5 19.Nf4 Rag8 20.c5 Ke7

Paloma
Posts: 1007
Joined: Thu Dec 25, 2008 8:07 pm

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Paloma » Sun Jan 17, 2021 3:59 am

10) But only 1.Rxf6 shows shortest win by mate in 22

Code: Select all

1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - 0 1

Analysis by Crystal 110920 Cry3.0:

1.Rxf6 gxf6 2.Qxf6+ Kg8 3.Qxh6 Rxd7 4.Bxd7 Qf8 5.Qxf8+ Kxf8 6.Bc8 Kg7 7.Bxa6 Kh6 8.Be2 Kg7 9.Kh3 Kh7 10.Kg4 Kh6 11.Kf5 Kg7 12.Bb5 Kh6 13.Kf6 Kh7 14.Bd3+ Kh6 15.Be2 Kh7 16.Kxf7 Kh6 17.Kg8 b5 18.a5 b4 19.a6 b3 20.a7 b2 21.a8Q b1Q 22.Qf8# 
  Weiß setzt Matt: +- (#22)  Tiefe: 43/43   00:00:27  136MN, tb=150080
1.Rxf6 gxf6 2.Qxf6+ Kg8 3.Qxh6 Rxd7 4.Bxd7 Qf8 5.Qxf8+ Kxf8 6.Bc8 Kg7 7.Bxa6 Kh6 8.Be2 Kg7 9.Kh3 Kh7 10.Kg4 Kh6 11.Kf5 Kg7 12.Bb5 Kh6 13.Kf6 Kh7 14.Bd3+ Kh6 15.Be2 Kh7 16.Kxf7 Kh6 17.Kg8 b5 18.a5 b4 19.a6 b3 20.a7 b2 21.a8Q b1Q 22.Qf8# 
  Weiß setzt Matt: +- (#22)  Tiefe: 44/43   00:00:28  139MN, tb=167773
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Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Sun Jan 17, 2021 2:49 pm

Vinvin wrote:
Sun Jan 17, 2021 2:43 am
...
26) Ne2-f4 -> Nc5 is also winning may be both moves are a transposition ? I still have to check deeper.

Code: Select all

FEN: 1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - 0 1

Crystal3.1-sse4-popcnt:
...
 25/43	00:27	 139 566 456	5 093 294	+1,75	1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6 4.Nh5 Rbc8 5.Nc5 Rg8 6.Bf4 Qxf4+ 7.Nxf4 Rxc5 8.a3 Rd8 9.Rh2 Re5 10.Ne2 Be4 11.Kd2 Bxd3 12.cxd3 b4 13.d4 Rb5 14.a4 Rd5 15.b3 a5 16.Re3 Rc8 17.g4 Kg8
 25/52	00:27	 139 566 456	5 093 294	+2,09	1.Nc5 Qf5 2.Nf4 Qxe5 3.Bd3 Kg8 4.Rh1 f5 5.Rxh6 Qxe3+ 6.Rxe3 gxh6 7.Be2 Rf7 8.b4 Rg7 9.Kb2 Kh7 10.Ncd3 Bb7 11.g3 Ra8 12.a3 Be4 13.a4 bxa4 14.Nh5 Bxd3 15.Bxd3 Rg6 16.Ka3 Kg8 17.Kxa4 Kf7 18.c4 Rg5 19.Nf4 Rag8 20.c5 Ke7
Confirmed by a long thinking by C-Fish with 3 best lines :

Code: Select all

FEN: 1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - 0 1

CF_EXT_x64_281220_ELTO_SSE41_popcnt:
...
 61/89	8:00:38	201 846 958 077	6 999 252	+1,89	1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6 4.Nh5 Rg8 5.Nc5 Rbc8 6.Bf4 Qxf4+ 7.Nxf4 Rxc5 8.Nh5 b4 9.b3 a5 10.Nf6 Rd8 11.Kb2 Bc6 12.a3 bxa3+ 13.Kxa3 Rb8 14.Rh4 Rc8 15.c4 Re5 16.Kb2 Ra8 17.Rh1 Rc8 18.Kc3 Rc5 19.Kd4 d6 20.Kc3 Ra8 21.Ne4 Bxe4 22.Bxe4 Rd8 23.Re3 Rdc8 24.Ra1 g6 25.Kb2 Kg7 26.Rd1 a4 27.Rxd6 axb3 28.Bd3 Rxc4 29.Bxc4 Rxc4 30.Rf3 Rc7 31.Rb6 Rc2+ 32.Kb1 Rxg2 33.Rb7 g5 34.Rfxf7+ Kg6 35.Rf8 g4 36.Rd7 b2
 61/91	8:00:38	201 846 958 077	6 999 252	+1,94	1.a3 b4 2.Bc5 Rg8 3.axb4 Rxb4 4.Nd2 Qh4 5.Bxb4 Qxb4 6.Rb3 Qh4 7.Kb1 a5 8.Nc3 f5 9.exf6 gxf6 10.Nf3 Qg4 11.Ra3 Qb4 12.Rd4 Qb8 13.Rb3 Qa8 14.Rb6 h5 15.Rh4 Kg7 16.Nd4 Qa7 17.Na4 Qc7 18.Rxh5 Qf4 19.Bd3 f5 20.c3 Rh8 21.Rxh8 Kxh8 22.Ka2 Kh7 23.Bb5 Kg7 24.Nb3 Qg3 25.Nxa5 f4 26.Nc4 Qxg2 27.Nd6 Qa8 28.Ka3 f3 29.b3 Kf6 30.Kb4 f2 31.Nc5 Kg7 32.Nxc8 Qxc8 33.Rb7 Kg8 34.Rxd7
 61/80	8:00:38	201 846 958 077	6 999 252	+2,69	1.Nc5 Qf5 2.Nf4 Qxe5 3.Bd3 Rb6 4.Rh1 Rc6 5.Ne4 d5 6.Rg5 dxe4 7.Rxe5 exd3 8.Nxd3 Rd8 9.Rc5 Rxc5 10.Nxc5 e5 11.a4 Kh7 12.a5 f6 13.Rf1 Kg6 14.b3 Kh5 15.Rh1+ Kg6 16.Rh4 Rd6 17.Bf2 h5 18.Be3 Rd5 19.g3 Rd6 20.Rh1 Bg4 21.Rf1 Kh7 22.Kb2 Rc6 23.Ne4 Bc8 24.Bb6 Kg6 25.Rd1 Kf5 26.Nf2 Kg5 27.Be3+ Kf5 28.Rd8 g5 29.Bb6 Kg6 30.Nd3 Bf5 31.Nb4 Rc8 32.Rd2 h4 33.gxh4 gxh4 34.Bg1 Kf7 35.Nxa6 h3
---------------------------------------------------------------------------
 62/109	9:01:31	227 392 004 630	6 998 493	+1,80	1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6 4.Nh5 Rg8 5.Nc5 Rbc8 6.Bf4 Qxf4+ 7.Nxf4 Rxc5 8.Nh5 b4 9.Nf6 Rd8 10.b3 a5 11.Kb2 Bc6 12.a3 bxa3+ 13.Kxa3 Rb8 14.Rh4 Rc8 15.c4 Rb8 16.Bb1 Ra8 17.Be4 d5 18.cxd5 exd5 19.Bb1 Rd8 20.Ng4 Rd6 21.Ne5 Kg8 22.Nxc6 Rdxc6 23.Rd3 Kf8 24.Rhd4 Rd6 25.Rd1 Ke7 26.g4 g6 27.R4d2 Kf6 28.Be4 Ke5 29.Bg2 f5 30.gxf5 gxf5 31.Rf1 h5 32.Rdf2 Rf6 33.Re2+ Kd6 34.Re8 h4 35.Rd8+ Ke7 36.Rxd5 Rxd5
 62/91	9:01:31	227 392 004 630	6 998 493	+1,93	1.a3 b4 2.Bc5 Rg8 3.axb4 Rxb4 4.Nd2 Qh4 5.Bxb4 Qxb4 6.Rb3 Qh4 7.Kb1 a5 8.Nc3 f5 9.exf6 gxf6 10.Nf3 Qg4 11.Ra3 Qb4 12.Rd4 Qb6 13.Rb3 Qd8 14.Rd6 f5 15.Nb5 Bb7 16.Ne5 Rg7 17.Rbd3 Bd5 18.R3xd5 exd5 19.Rxh6+ Kg8 20.Nf3 Rh7 21.Rg6+ Kf7 22.Ne5+ Ke7 23.Ka2 Qh8 24.Nf3 Rg7 25.Rd6 Qh1 26.Bd3 Rg4 27.Rxd5 Qxg2 28.Re5+ Kd8 29.Rxf5 Qh1 30.Nc3 Rb4 31.b3 Qc1 32.Rxa5 Rb8
 62/86	9:01:31	227 392 004 630	6 998 493	+2,52	1.Nc5 Qf5 2.Nf4 Qxe5 3.Bd3 Rb6 4.Rh1 Rc6 5.Ne4 d5 6.Rg5 dxe4 7.Rxe5 exd3 8.Nxd3 Rd8 9.Rc5 Rxc5 10.Nxc5 e5 11.a4 bxa4 12.Nxa4 f6 13.Nc5 Kh7 14.Rf1 h5 15.g3 Kg6 16.b3 Bh3 17.Rf2 Bg4 18.Bd2 Bc8 19.c4 Rd4 20.Bc3 Rd8 21.Ba5 Rd4 22.Bd2 Rg4 23.Rf3 Kf7 24.Bc3 Ke7 25.Nd3 Re4 26.Kd2 Bg4 27.Rf2 Be6 28.Bb4+ Kf7 29.Kc2 Re3 30.Bd2 Rxg3 31.Nxe5+ Ke8 32.Nd3 h4 33.Bf4 Rxd3 34.Kxd3 g5 35.Bh2

Vinvin
Posts: 4911
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Questionable positions in the Hard-Talkchess-2020 set

Post by Vinvin » Mon Jan 18, 2021 2:18 am

Revision 2021 to the Hard-Talkchess-2020 set (draft) :

I deleted : too easy positions, bad positions, too hard positions.
It still have doubt about 4 positions. See at bottom.
128 positions left in the set (until now) :

Code: Select all

1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - bm Nc6; id "Hard-Talkchess-2020.001" ;
1B1r4/rp2npkp/2b1pbp1/1qp5/nPN1R3/1P1P1QP1/2P2PBP/5R1K w - - bm Qxf6+; id "Hard-Talkchess-2020.002" ;
1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - bm Nc6; id "Hard-Talkchess-2020.003" ;
1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - - bm e5+; id "Hard-Talkchess-2020.004" ;
1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - bm Rxh1; id "Hard-Talkchess-2020.007" ;
1nb3rr/2pp3p/p1k2P2/n1q1PN2/P1pR3N/b4PBp/1R2P3/1KQ5 w - - bm Rd6+; id "Hard-Talkchess-2020.008" ;
1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - bm Rxf6; id "Hard-Talkchess-2020.010" ;
1r1q1rk1/1p2b2p/pN6/P1pP1bp1/5p2/2B2Q2/1P4PP/R4RK1 w - - bm g4; id "Hard-Talkchess-2020.011" ;
1r1rb1k1/5ppp/4p3/1p1p3P/1q2P2Q/pN3P2/PPP4P/1K1R2R1 w - - bm Rxg7+; id "Hard-Talkchess-2020.012" ;
1r2kb1r/p5p1/1np1p1N1/3pPnB1/1p1P2B1/qP6/2PQ1P1P/1K1R3R b k - bm Nc4; id "Hard-Talkchess-2020.013" ;
1r3r2/4bpkp/1qb1p1p1/3pP1P1/p1pP1Q2/PpP2N1R/1Pn1B2P/3RB2K w - - bm Qf6+; id "Hard-Talkchess-2020.014" ;
1r3rk1/3bb1pp/1qn1p3/3pP3/3P1N2/2Q2N2/2P3PP/R1BR3K w - - bm h4; id "Hard-Talkchess-2020.015" ;
1r3rk1/3bbppp/1qn2P2/p2pP1P1/3P4/2PB1N2/6K1/qNBQ1R2 w - - bm Bxh7+; id "Hard-Talkchess-2020.016" ;
1r3rk1/5p1p/p2pb1p1/3Np1P1/2pRPR2/qP2Q1N1/P1PK3P/8 w - - bm Nf5; id "Hard-Talkchess-2020.019" ;
1r4k1/pb3p1p/r1p1p1p1/2p1P3/P1P2P2/1PB5/2K3PP/5R2 w - - bm a5; id "Hard-Talkchess-2020.020" ;
1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - bm Rxb3+; id "Hard-Talkchess-2020.021" ;
1rb1qrk1/2b2pp1/p3pBn1/3pP1Pp/1ppP4/2P1QN2/PP3P1P/R2BR1K1 w - - bm Nh4; id "Hard-Talkchess-2020.023" ;
1rb1r1k1/2qn1pbp/pp1p2p1/2nP4/P1p1PP2/2N1BQNP/1PB3P1/R4R1K w - - bm e5; id "Hard-Talkchess-2020.025" ;
1rbq1r1k/7p/2np2p1/p2N1p2/R1B1PP1b/1PP1N3/8/3Q1K1R w - - bm Ra2; id "Hard-Talkchess-2020.028" ;
1rbq1rk1/1p2ppbn/p2p2p1/P1pP4/4P3/2PB1N2/2P3PP/R1B1QRK1 w - - bm e5; id "Hard-Talkchess-2020.029" ;
2R5/k1p1p1K1/P1p1Pp2/5P2/7P/pB6/2p5/2r5 w - - bm Rxc7+; id "Hard-Talkchess-2020.031" ;
2b1rk2/5p2/p1P5/2p2P2/2p5/7B/P7/2KR4 w - - bm f6; id "Hard-Talkchess-2020.034" ;
2b3r1/1p1p2pk/2nBp2p/2P1Ppq1/R7/4QBPP/5P2/5K2 w - - bm Qxg5; id "Hard-Talkchess-2020.035" ;
2bk2r1/5q2/1p2pP1Q/pP1pP1P1/P2P4/8/2RK4/8 w - - bm Kc1; id "Hard-Talkchess-2020.036" ;
2bqrr1k/p5b1/1p1p2pp/nPpBp3/P1P1N2P/3PN1P1/R4P1K/3Q1R2 w - - bm Nc3; id "Hard-Talkchess-2020.038" ;
2k2Br1/p6b/Pq1r4/1p2p1b1/1Ppp2p1/Q1P3N1/5RPP/R3N1K1 b - - bm Rf6; id "Hard-Talkchess-2020.039" ;
2q2r1k/p1p1b1pp/br1p1n2/2p1N1BP/Q1P1P3/8/PP1N1PP1/2KR3R w - - bm Ng6+; id "Hard-Talkchess-2020.043" ;
2r2bk1/pNq3p1/2Pp3p/1p1Prp2/1P2p1P1/6Q1/P4P1P/2RR2K1 w - - bm Qxe5; id "Hard-Talkchess-2020.046" ;
2r2r1k/qb3p1p/p2p1Np1/np1Pp1P1/2P5/3RP2P/5R2/4Q1K1 w - - bm Rf4; id "Hard-Talkchess-2020.047" ;
2r2rk1/1bpR1p2/1pq1pQp1/p3P2p/P1PR3P/5N2/2P2PPK/8 w - - bm Kg3; id "Hard-Talkchess-2020.049" ;
2r2rk1/2q2p1p/p1p1nPpQ/3p4/4p1B1/8/PPP3PP/R4R1K w - - bm Rf5; id "Hard-Talkchess-2020.050" ;
2r4r/3n1pk1/pq1p1bp1/3B4/1p2P1N1/7P/PP1Q1PK1/3RR3 w - - bm Bxf7; id "Hard-Talkchess-2020.052" ;
2r5/prkpR1p1/2p1ppK1/P1p1N1B1/P1P1P3/8/8/8 w - - bm Bf4; id "Hard-Talkchess-2020.053" ;
3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P1K2P/PPB5/8 w - - bm Ba4+; id "Hard-Talkchess-2020.054" ;
3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - - bm Nexg6; id "Hard-Talkchess-2020.056" ;
3k4/4pp2/n2n4/5BN1/3N4/b7/4K3/8 w - - bm Nxf7+; id "Hard-Talkchess-2020.058" ;
3kB3/5K2/7p/3p4/3pn3/4NN2/8/1b4B1 w - - bm Nf5; id "Hard-Talkchess-2020.059" ;
3q1r1k/6rp/3p4/P2Pbp1Q/N3Pp1n/2P5/P1B2RPP/R6K b - - bm f3; id "Hard-Talkchess-2020.061" ;
3r1rk1/pbq1bp1p/1n1Rp1p1/2p1P1N1/4N2P/1P3Q2/PB3PP1/K6R w - - bm h5; id "Hard-Talkchess-2020.063" ;
3rqbk1/2p3p1/b6p/Q1p5/2N1PP2/1P1P2P1/2P4P/5R1K b - - bm Bc8; id "Hard-Talkchess-2020.065" ;
4B3/1Pb4p/8/4p1k1/3p1p2/5K2/2P5/8 b - - bm e4+; id "Hard-Talkchess-2020.066" ;
4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - bm f4; id "Hard-Talkchess-2020.067" ;
4K2k/1pQp3p/1R4p1/1P4P1/8/3P3P/1q3r2/8 w - - bm Qd8; id "Hard-Talkchess-2020.068" ;
4R3/P7/2bB2p1/r3pk2/2p2p1P/2P2P1K/6P1/8 w - - bm Rxe5+; id "Hard-Talkchess-2020.069" ;
4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - bm a8=B; id "Hard-Talkchess-2020.070" ;
4b3/7p/4k3/B4pPP/5K2/P4P2/8/8 w - - bm g6; id "Hard-Talkchess-2020.072" ;
4bbk1/3nq2r/pr2p3/Np1p1p1p/1PpP1Pp1/2P1P1P1/PQ1NB1PR/2K4R b - - bm e5; id "Hard-Talkchess-2020.073" ;
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8; id "Hard-Talkchess-2020.074" ;
4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - bm Qxe5; id "Hard-Talkchess-2020.078" ;
4r1rk/p3qpp1/1pnp1n1p/5P2/P1PPP3/4Q2P/2BB2R1/6RK w - - bm Rxg7; id "Hard-Talkchess-2020.081" ;
5k2/8/pppppppp/8/PPPPPPPP/8/8/5K2 w - - bm d5; id "Hard-Talkchess-2020.083" ;
5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - bm c8=N; id "Hard-Talkchess-2020.087" ;
5rk1/pp3p1p/7b/2pR4/8/2P4P/P1PNr1P1/2K4R b - - bm Rxd2; id "Hard-Talkchess-2020.089" ;
6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - bm Bf8+; id "Hard-Talkchess-2020.090" ;
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm Bxc5+; id "Hard-Talkchess-2020.091" ;
6k1/1qr1p2p/ppN5/3p1N2/6p1/1P1P2Pp/PP2PP1P/2RK4 w - - bm Ncxe7+; id "Hard-Talkchess-2020.093" ;
6k1/8/1pK4p/bPp5/8/1P6/P1B2P2/8 w - - bm b4; id "Hard-Talkchess-2020.094" ;
6k1/p7/8/4B3/Pp3p1P/qP5P/P1Rb2K1/8 w - - bm Kf3; id "Hard-Talkchess-2020.095" ;
6k1/ppn2p2/8/2P2P1p/1P2K3/2N5/P7/8 w - - bm Nd5; id "Hard-Talkchess-2020.096" ;
6r1/6r1/2p1k1pp/p1pbP2q/Pp1p1PpP/1P1P2NR/1KPQ3R/8 b - - bm Qf5; id "Hard-Talkchess-2020.097" ;
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+; id "Hard-Talkchess-2020.099" ;
7k/pp2Np1p/2p2P1N/5pP1/7K/P4n2/1q3Q2/5n2 w - - bm Kh5; id "Hard-Talkchess-2020.101" ;
8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - bm Qh3+; id "Hard-Talkchess-2020.103" ;
8/1p1pNpbk/1q1P4/pP2p2K/P3N3/4P1P1/3P4/8 w - - bm Nc8; id "Hard-Talkchess-2020.105" ;
8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - bm Bh5+; id "Hard-Talkchess-2020.108" ;
8/2p1q3/p3P3/2P4p/1PBP2kP/2N3P1/7K/8 w - - bm Be2+; id "Hard-Talkchess-2020.109" ;
8/2pN1k2/p4p1p/Pn1R4/3b4/6Pp/1P3K1P/8 w - - bm Ke1; id "Hard-Talkchess-2020.110" ;
8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - bm Nf6+; id "Hard-Talkchess-2020.113" ;
8/3ppp1p/3P4/4N3/8/3n1pKp/8/7k w - - bm Nxd3; id "Hard-Talkchess-2020.114" ;
8/4nk2/1p3p2/1r1p2pp/1P1R1N1P/6P1/3KPP2/8 w - - bm Nd3; id "Hard-Talkchess-2020.116" ;
8/4nk2/1p3p2/2rp2pp/1P1R1N1P/6P1/3KPP2/8 b - - am Rb5?; id "Hard-Talkchess-2020.117" ;
8/5p2/N1p3p1/3pP1P1/7P/2kP4/Pb6/7K w - - bm h5; id "Hard-Talkchess-2020.119" ;
8/6pp/1K6/N5P1/3N4/8/npn1P3/k7 w - - bm Nab3+; id "Hard-Talkchess-2020.121" ;
8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - bm Bh3; id "Hard-Talkchess-2020.122" ;
8/8/p2k1p2/1p1p3p/1P1P3p/P3NPP1/5K2/1b6 w - - bm Ng2; id "Hard-Talkchess-2020.125" ;
8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - bm Nc6; id "Hard-Talkchess-2020.126" ;
8/p3N3/1n3N2/2n3pP/pkP5/8/3P4/K7 b - - bm Nxc4; id "Hard-Talkchess-2020.127" ;
8/p7/qkpN1p2/8/1B1P4/PP3K2/5P2/8 w - - bm Ba5+; id "Hard-Talkchess-2020.129" ;
N7/8/2KQ2rp/6k1/3p3p/2p4P/4PP2/5N2 w - - bm f4+; id "Hard-Talkchess-2020.130" ;
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - bm Nc7; id "Hard-Talkchess-2020.131" ;
br1r2k1/5pp1/R6p/2pN4/P1P1q3/2P1p1P1/P3P2P/3RQ1K1 b - - bm Qxc4; id "Hard-Talkchess-2020.132" ;
k7/p1pR4/1p3p2/2P2rpB/PbP4p/2N1p2p/KP6/8 w - - bm Bf3+; id "Hard-Talkchess-2020.133" ;
n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w - - bm Bc7; id "Hard-Talkchess-2020.135" ;
q7/7R/k7/1p6/1p6/1P2B3/7K/8 w - - bm Bd4; id "Hard-Talkchess-2020.140" ;
r1b1qk1r/pn3pp1/1p2p3/3pP1Bp/1bPN4/4Q1R1/P2N1PP1/R5K1 w - - bm Bf6; id "Hard-Talkchess-2020.144" ;
r1b1qr1k/2p3pp/4p3/1pb1PpN1/pn3N1P/8/PPP1QPP1/2KR3R w - - bm Rd8; id "Hard-Talkchess-2020.146" ;
r1b1qr1k/2p3pp/4p3/1pb1PpN1/pn3N1P/P7/1PP1QPP1/2KR3R w - - bm Rd8; id "Hard-Talkchess-2020.147" ;
r1b2rk1/2q1bppp/p2pp3/2n3PQ/1p1BP3/1BN5/PPP2P1P/2KR2R1 w - - bm Bf6; id "Hard-Talkchess-2020.150" ;
r1b2rk1/pp3ppp/1n2p3/3pP3/2P2B2/b1PB1qP1/P1Q1NP1P/1K1R3R w - - bm Nd4; id "Hard-Talkchess-2020.153" ;
r1b3k1/ppp1q1pp/2n1p3/3pP2P/8/2NB2Q1/PPP3P1/2K2R2 w - - bm Bg6; id "Hard-Talkchess-2020.155" ;
r1b3k1/ppppn1pp/4n1q1/8/5P2/2N1B3/PPP3QP/3R1RK1 w - - bm f5; id "Hard-Talkchess-2020.156" ;
r1bq1b1r/pp1pp1pp/2n1k3/8/4nQ2/N1p1BN1P/PP3PP1/R3K2R w KQ - bm Nb5; id "Hard-Talkchess-2020.158" ;
r1bq1rk1/1p1nbppp/p3p3/2ppP3/5B1P/2PBP3/PP1N1PP1/R2QK2R w - - bm Bxh7+; id "Hard-Talkchess-2020.159" ;
r1bq1rk1/pp2b2p/2p1pppQ/8/1n1PN2P/3B1N2/PPP2PP1/2KR3R w - - bm Neg5; id "Hard-Talkchess-2020.160" ;
r1br2k1/1p1nqppp/p1p1pn2/3p4/1bPP4/PPN1PN2/2BB1PPP/R2Q1RK1 b - - am Bxa3; id "Hard-Talkchess-2020.164" ;
r1n2N1k/2n2K1p/3pp3/5Pp1/b5R1/8/1PPP4/8 w - - bm Ng6+; id "Hard-Talkchess-2020.166" ;
r1qn1rk1/p1pp1ppp/1p2p2b/1P2P3/P7/R2B1N2/1P4PP/3Q1R1K w - - bm Bxh7+; id "Hard-Talkchess-2020.169" ;
r2q1r2/1b2bpkp/n3p1p1/2ppP1P1/p6R/1PN1BQR1/NPP2P1P/4K3 w - - bm Qf6+; id "Hard-Talkchess-2020.170" ;
r2q1r2/1b2bpkp/p3p1p1/2ppP1P1/7R/1PN1BQR1/1PP2P1P/4K3 w - - bm Qf6+; id "Hard-Talkchess-2020.171" ;
r2q1rk1/ppp2p2/3p1np1/4pNQ1/4P1pP/1PPP4/1P3P2/R3K1R1 w Q - bm Qh6; id "Hard-Talkchess-2020.173" ;
r2qrbk1/1b3p2/3p2pB/1p1P1N2/1np1P3/5NRP/1P3PP1/1B1Qn1K1 w - - bm N3h4; id "Hard-Talkchess-2020.177" ;
r2r2k1/pqp1bppp/1pn1pn2/8/2NP1B2/2N1P1P1/PPQ2P1P/R4RK1 b - - bm Rxd4; id "Hard-Talkchess-2020.179" ;
r3kb1r/4Pp2/pn3P2/1pp3B1/2p5/2N3P1/PP3P1P/3RKB1b w - - bm h4; id "Hard-Talkchess-2020.181" ;
r3r1k1/1b1n1pbp/pq1p2p1/1pp1P3/3P1B2/nP1B1NNP/P4PP1/R2QR1K1 w - - bm Nh5; id "Hard-Talkchess-2020.182" ;
r3r1k1/1b1nbp1p/1qn1p3/1p1pPp2/p2P4/P2BNN2/1P1Q1BPP/R4RK1 w - - bm Ng4; id "Hard-Talkchess-2020.183" ;
r3r1k1/pp1q1p2/2p2npb/PPPp1bnp/3PpN2/2N1P1PP/1R1B1PBK/3Q1R2 b - - bm Bg4; id "Hard-Talkchess-2020.184" ;
r3r1k1/pp1q1p2/2p2npb/PPPp4/3Pp3/2NNPpP1/1R1B1P1K/3Q3R b - - bm Kg7; id "Hard-Talkchess-2020.185" ;
r3r2k/1pq2pp1/4b2p/3pP3/p1nB3P/P2B1RQ1/1PP3P1/3R3K w - - bm Rf6; id "Hard-Talkchess-2020.186" ;
r4r1k/1p1n1ppp/1qb1p3/2b1P3/2B3Q1/p1NR4/PPP3PP/1KB1R3 w - - bm Rh3; id "Hard-Talkchess-2020.188" ;
r4rk1/1bq1bppp/p1npp3/2nB1NP1/1p2P3/2N1B3/PPP1QP1P/2KR2R1 w - - bm Qh5; id "Hard-Talkchess-2020.190" ;
r4rk1/4bppp/bq2p3/npnpP3/p2B1P2/P1PB1N2/1P2QNPP/R4RK1 w - - bm Bxh7+; id "Hard-Talkchess-2020.191" ;
r4rk1/pb3pp1/1p1qpR2/2ppN3/3P4/2P4P/PP1pQ1P1/3R2K1 w - - bm Qxd2 Ng4; id "Hard-Talkchess-2020.192" ;
r5k1/1b2bppp/1n2p3/1P6/2qPP3/r1p2N2/1R2QPPP/1BR1B1K1 b - - bm cxb2; id "Hard-Talkchess-2020.193" ;
r5k1/6b1/2Nq4/2pP1p2/p1P1pPr1/Pp6/3R2PQ/1K3R2 b - - bm e3; id "Hard-Talkchess-2020.194" ;
r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - bm Rxh2+; id "Hard-Talkchess-2020.195" ;
r5rk/1bq1bpp1/1p1ppn1p/pP5P/2P1P3/P1N2P2/1B1Q1P2/1K1R1BR1 w - - bm Nd5; id "Hard-Talkchess-2020.196" ;
r7/1QP1N1Kp/pn2P1b1/Nnk2p2/7p/p4BP1/1rPPp2q/8 w - - bm Nd5; id "Hard-Talkchess-2020.198" ;
r7/1q1r1p1k/3p1Qpp/pbpP4/1nB1P1P1/1P3NBP/5P1K/4R3 w - - bm Bf4; id "Hard-Talkchess-2020.200" ;
rn1qr1k1/1p2bppp/p3p3/3pP3/P2P1B2/2RB1Q1P/1P3PP1/R5K1 w - - bm Bxh7+; id "Hard-Talkchess-2020.201" ;
rn2kr2/1pp1b1p1/4p3/1Pp1P2p/p1P1NP1P/P7/1B4P1/3RR1K1 w - - bm g3; id "Hard-Talkchess-2020.203" ;
rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - bm Bg5; id "Hard-Talkchess-2020.204" ;
rn3r2/p2qp1k1/2pp1pp1/7n/1p1PP1b1/2N2N2/PPPQB3/2KR3R w - - bm Rdg1; id "Hard-Talkchess-2020.205" ;
rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - - bm Nd6; id "Hard-Talkchess-2020.207" ;
rnb2rk1/1pq1bppp/p3p3/2npP1P1/3N1P2/2NBB3/PPP4P/R2QK2R w KQ - bm Bxh7+; id "Hard-Talkchess-2020.208" ;
rnbq1rk1/p3bp2/2p1p1p1/1p1nP1P1/2pP1P2/2N5/PP4P1/RBBQK2R w KQ - bm Bd2; id "Hard-Talkchess-2020.209" ;
rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - bm Qh5+; id "Hard-Talkchess-2020.210" ;
rnbqk2r/p4p2/2p1p3/1p2N1pp/PbpPn2P/2N1P1B1/1P3PP1/R2QKB1R w KQkq - bm Qf3; id "Hard-Talkchess-2020.211" ;
rqn2rk1/1p2ppb1/p1b3pp/2R1P1N1/8/4BB1Q/3R1PPP/6K1 w - - bm Nxf7; id "Hard-Talkchess-2020.213" ;
Still doubts about 4 positions :

Code: Select all

 10) Rd6xf6 -> A lot of moves are winning. But only Rxf6 gives a forseable mate. This position will probably stay.
 15) h2-h4  -> Some other moves are close in eval : Bd2, Be3, h3
150) Bd4-f6 -> Qh6 is very close in eval
204) Bc1-g5 -> the score of b4 is high (> 2.5) after a long analyse 

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