Hard talkchess 2016 beta 1

[Vinvin]

I have mechanical (computer generated) solutions for all except these 9:

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q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - acd 44; acs 983; bm Qxe7+; c0 "Stockfish and Houdini both like Qxe7+ to draw"; c3 "Qd4+"; ce 0; pm Qxe7+; pv Qxe7+ Qb7 b6+ Ka8 Qxb7+ Kxb7 a6+ Kxa6 Rxc8 Rxe5+ Kxe5 e2 Ra8+ Kxb6 Rb1+ Kc6 Raa1 c2 Ra6+ Kc5 Ra5+ Kc6 Ra6+;

With the help of Sting-SF 6 I found the main line for this one :

[Event "-"]
[White "W"]
[Black "B"]
[Result "1-0"]
[SetUp "1"]
[FEN "q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - 0 1"]

1. Qd4+ Kb8 2. Qb6+ Qb7 3. Qxb7+ Kxb7 4. a6+ Kb8 5. Rxc8+ Kxc8 6. a7 Kb7 7.
a8=Q+ Kxa8 8. Kc6 Rh6+ 9. e6 Rxe6+ 10. Kc7 1-0

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1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - acd 39; acs 624; bm Bc5; c0 "Bc5 and Nc5 both draw. Does Nf4 really do better?"; c3 "Nf4"; ce 0; pm Bc5; pv Bc5 Re8 Rd4 Qf5 Rf4 Qh5 Bd6 Rb6 Rh3 Qg5 Rg3 Qh5;

After some manual search the score rise to +0.90 here, probably because a strong attack on the black king with the line :
+0,87 1.Nf4 Qxe5 2.Bd3 Bb7 3.Rh1 Qd6

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1r2r1kb/2qn1p1p/3p2pB/pbpP1N2/1n2P3/R4N1P/1P3PP1/1BQ1R1K1 w - - acd 33; acs 333; bm N3d4; c0 "Both Stockfish and Houdini like N3d4"; c3 "Qf4"; ce 83; pm N3d4; pv N3d4 Ba6 Bg5 Kf8 Rg3 Ne5 Nh6 Bg7 Ndf5 Bh8 Qd1 c4 Nd4 Bg7 Nhf5 f6 Bf4 Bc8 Nxg7 Kxg7 Rc3 Bd7 b3 Qb6 bxc4 Rbc8 Be3 Qa6 c5 Rxc5 Ne6+ Bxe6 Bxc5 dxc5 f4 Bd7 fxe5 Rxe5 Qc1 c4 Rxc4;

Same here, Qf4 rise :
+0,79 1.N3d4 Ba6 2.Bg5 Kf8 3.Rg3 Ne5 4.Nh6 Bg7 5
+1,10 1.Qf4 Ne5 2.Qh4 Bd7 3.Ne7+ Rxe7 4.Qxe7 Re8

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1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - acd 34; acs 680; bm Bd2; c0 "Rae1, Kh2, and Bd2 are all worth about half a pawn. Is Nh2 better?"; c3 "Nh2"; ce 58; pm Bd2; pv Bd2 Nc6 Rae1 b5 Qg3 Re7 Re3 Qd7 Rfe1 Rce8 Kh2 Na5 Ra1 Nc6 Ree1 Rg8 Ra2 Ra8 Kg1 Ree8 Raa1 Re7 Ra3 Ree8 Re2 Qf7 Ra1 Re7 exf6 Bxf6 Rxe7 Qxe7 axb5 axb5 Rxa8; 

After playing the solution 1.Nh2, the score rise. A demolition with 2.g4!! is coming in about all lines !

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1k2r2r/1p1qb2p/p1p1b1p1/P2pPp2/1P1P4/2RB4/2PBQ1PP/1R4K1 w - - acd 37; acs 1199; bm b5; c0 "Both Stockfish and Houdini like b5"; c3 "Rcb3"; ce 169; pm b5; pv b5 axb5 Rcb3 Ka7 Bxb5 cxb5 Rxb5 Rb8 Rb6 Rhc8 a6 Rc7 axb7 Qa4 Rxe6 Rbxb7 Rxb7+ Rxb7 h3 Kb8 Qd3 Qa3 Qxa3 Bxa3 Re8+ Kc7 Rh8 Kc6 Kf2 Bb2 c3 Ra7 Rb8 Ba3 Ke3 Kc7 Rh8 Kc6 Kd3 Rb7 Rg8 Ra7 Rd8 Be7 Rc8+ Rc7 Ra8 Rb7 Ra5 Rb2 Ra7; 

SF found 1.Rcb3 alone on my comp after 357 Seconds (6*4GHz). But 1.Rcb3 and 1.b5 seems to be the same by transposition. Even 1.Bxa6 seems winning.
+1,21 1.Bxa6 bxa6 2.Qxa6 Qb7 3.Rxc6 Qxa6 4.Rxa6
+1,33 1.b5 cxb5 2.Bxb5 axb5 3.Rxb5 Ka8 4.Rcb3
+1,34 1.Rcb3 Qc7 2.b5 cxb5 3.Bxb5 axb5 4.Rc3

[Vinvin]

I ran the 20 remaining positions (2 times each) with Houdini 3 tactical 20 min/position 4*4GHz .

Analyzing engine: Houdini_3_Pro_x64
Use seconds per move : 1200 Seconds per move
Analysis Lines : Minimum search depth=10
Activate abort analysis : True. Minimal analysis depth 22. Abort, if the correct move is held 4 additional ply

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 1) f4-f5            f4-f5   61 Sec         f4-f5   286 Sec
 2) Be2-h5           Be2-h5  1186 Sec       Nh3xf2
 3) Nf3-h4           Qd1xe1                 Qd1xe1
 4) c7-c8N           c7-c8N  454 Sec        c7-c8N  150 Sec
 5) Kb7-c8           a5-a6                  Kb7-c8  1025 Sec
 6) .. Ba8xe4        Nc5-e6                 Nc5-e6
 7) Nc4xe5, Nf3xe5   Nc4xe5  46 Sec         Nc4xe5  107 Sec
 8) Ne5-g6           Ne5-d3                 Ne5-g6  943 Sec
 9) .. Rh6xh2        a7-a6                  a7-a6
10) Nc3-d5           Nc3-d5  141 Sec        Nc3-d5  121 Sec
11) Nf3-h2           Ra1-e1                 Rf1-e1
12) Qh4-d4           Qh4xe7                 Qh4xe7
13) Nd4-f5           h2-h4                  h2-h4
14) .. Nc5-e4        Nc5-e4  605 Sec        Nc5-e4  879 Sec
15) Rh1-h6           Rh1-h6  2 Sec          Rh1-h6  0 Sec
16) Bb6-c7           Bb6-c7  5 Sec          Bb6-c7  22 Sec
17) Ne2-f4           Nb3-c5                 Nb3-c5
18) Qc1-f4           Nf3-d4                 Nf3-d4
19) Nd4-c6           Nd4-c6  894 Sec        g7-g8Q
20) Rc1xc8           Rc1xc8  78 Sec         Rc1xc8  9 Sec

1r1b4/n2b3k/1p1Np1p1/p2pP1Pp/P2P1P2/1PBN4/6K1/2R5 w - - id ?; bm f5;
8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - id ?; bm Bh5;
r2qrbk1/1b3p2/3p2pB/1p1P1N2/1np1P3/5NRP/1P3PP1/1B1Qn1K1 w - - id ?; bm N3h4;
5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - id ?; bm c8N;
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - id ?; bm Kc8;
brnq1rk1/5pp1/p2p4/Npn1p1RP/4P3/P4P2/1PPQB3/R2NK3 b - - id ?; bm Bxe4;
b1r2r1k/1q2b1p1/n2p3p/1p1Pp3/nPN1Pp2/BQ3N1P/5PP1/R1R2BK1 w - - id ?; bm Ncxe5 Nfxe5;
2q2r1k/p1p1b1pp/br1p1n2/2p1N1BP/Q1P1P3/8/PP1N1PP1/2KR3R w - - id ?; bm Ng6+;
r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - id ?; bm Rxh2;
r5rk/1bq1bpp1/1p1ppn1p/pP5P/2P1P3/P1N2P2/1B1Q1P2/1K1R1BR1 w - - id ?; bm Nd5;
1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - id ?; bm Nh2;
q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - id ?; bm Qd4+;
2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;
2q1r1k1/b1r2pp1/p4np1/2np4/1Q6/4PP1P/P1B1N1P1/1RBR1K2 b - - id ?; bm Nce4;
kr1b4/p1p2B2/2p5/2p1p3/KpP1P3/1P4N1/8/7R w - - id ?; bm Rh6;
1k1n4/1p1b1p2/1Bp1pPp1/1PP1P3/8/6P1/8/1K6 w - - id ?; bm Bc7+;
1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - id ?; bm Nf4;
1r2r1kb/2qn1p1p/3p2pB/pbpP1N2/1n2P3/R4N1P/1P3PP1/1BQ1R1K1 w - - id ?; bm Qf4;
8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - id ?; bm Nc6;
2r2rk1/p3qbb1/Pp2p3/1N1p3p/3PnNpP/3B2P1/1P3P2/2RQ1RK1 w - - id ?; bm Rxc8;

[Paloma]

> I ran the 20 remaining positions (2 times each) with Houdini 3 tactical 20 min/position 4*4GHz.

Why from 31 positions are only 20 left?

e.g.:
15) .. Rb8xb4 Rb8xb4 * 282 Seconds
35) Bd3xh7 Bd3xh7 * 908 Seconds
42) e5-e6 e5-e6 * 209 Seconds
43) d4-d5 d4-d5 * 301 Seconds

are good positions, or not?

[Vinvin]

> I ran the 20 remaining positions (2 times each) with Houdini 3 tactical 20 min/position 4*4GHz.

Why from 31 positions are only 20 left?

e.g.:
15) .. Rb8xb4 Rb8xb4 * 282 Seconds
35) Bd3xh7 Bd3xh7 * 908 Seconds
42) e5-e6 e5-e6 * 209 Seconds
43) d4-d5 d4-d5 * 301 Seconds

are good positions, or not?

I didn't research positions proven OK.
I'll make a final conclusion in some days.

[Paloma]

Ah, ok now

[EvgeniyZh]

Any update?

[Vinvin]

...

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1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - acd 34; acs 680; bm Bd2; c0 "Rae1, Kh2, and Bd2 are all worth about half a pawn. Is Nh2 better?"; c3 "Nh2"; ce 58; pm Bd2; pv Bd2 Nc6 Rae1 b5 Qg3 Re7 Re3 Qd7 Rfe1 Rce8 Kh2 Na5 Ra1 Nc6 Ree1 Rg8 Ra2 Ra8 Kg1 Ree8 Raa1 Re7 Ra3 Ree8 Re2 Qf7 Ra1 Re7 exf6 Bxf6 Rxe7 Qxe7 axb5 axb5 Rxa8; 

After playing the solution 1.Nh2, the score rise. A demolition with 2.g4!! is coming in about all lines !

I'm slowly buiding all best lines in each positions to produce the PGN file ...

Here, after Nh2 :
33/74 35:01 18 945 402k 9 017k +1,26 1. ... Rc6 2.g4 hxg4 3.h5 Bc8 4.hxg6+ Kxg6 5.Qh4 fxe5 6.Qxd8 Rxd8 7.fxe5 Rh8 8.Nxg4 Be6 9.Bf4 Rcc8 10.Ne3 Nc6 11.Kf2 Ne7 12.Rg1+ Kf7 13.Rh1 Rcf8 14.Rag1 Rxh1 15.Rxh1 Rh8 16.Rxh8 Bxh8 17.Bg5 b5 18.axb5 axb5 19.Kg3 Bg7 20.Kf4 Ng6+ 21.Kf3
33/74 35:01 18 945 402k 9 017k +1,25 1. ... Rc7 2.g4 hxg4 3.h5 Bc8 4.hxg6+ Kxg6 5.Qh4 Rg8 6.Qxg4+ Kf7 7.Qh5+ Kf8 8.Bxf5 Rh8 9.Qg4 Bxf5 10.Qxf5 Nc6 11.Rf2 Qc8 12.Qg4 Rh3 13.Bd2 Qxg4+ 14.Nxg4 f5 15.Ne3 Ne7 16.Rh2 Rxh2 17.Kxh2 Rc6 18.Be1 Rh6+ 19.Kg2 Kf7 20.Bg3 Ke6 21.Rg1 Kf7 22.Kf3 Rh3 23.Ke2 Ke6 24.Kd2 Kf7
33/74 35:01 18 945 402k 9 017k +1,10 1. ... Nd7 2.g4 fxg4 3.f5 Kh8 4.fxg6 fxe5 5.Nxg4 hxg4 6.h5 e4 7.h6 Qf6 8.hxg7+ Kxg7 9.Bh6+ Kxh6 10.Qh2+ Kxg6 11.Rxf6+ Nxf6 12.Rf1 Re6 13.Bd1 Rg8 14.Qf4 Bc8 15.b3 b5 16.bxc4 bxc4 17.a5 Bd7 18.Qf5+ Kg7 19.Bc2 Kh6 20.Kg2 Rg6 21.Ba4 Re7 22.Bxd7 Rxd7 23.Qe6
33/74 35:01 18 945 402k 9 017k +1,07 1. ... Rh8 2.g4 hxg4 3.h5 Kg8 4.hxg6 Qd7 5.Qg2 Rf8 6.Rae1 Bc8 7.Bd2 fxe5 8.fxe5 Qc6 9.Rf2 Qxg6 10.Rf4 Rh4 11.e6 Bxe6 12.Rxg4 Rxg4 13.Nxg4 Qxg4 14.Rxe6 Rf6 15.Rxf6 Qxg2+ 16.Kxg2 Bxf6 17.Bxf5 Kf7 18.Bc8 b5 19.a5 b4 20.Bf4 bxc3 21.bxc3 Nc6 22.Bc7 Ke7 23.Bxa6 Bxd4 24.cxd4 c3 25.Bf4 Nxa5 26.Bg5+ Ke6 27.Kf3

[Vinvin]

...

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1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - acd 34; acs 680; bm Bd2; c0 "Rae1, Kh2, and Bd2 are all worth about half a pawn. Is Nh2 better?"; c3 "Nh2"; ce 58; pm Bd2; pv Bd2 Nc6 Rae1 b5 Qg3 Re7 Re3 Qd7 Rfe1 Rce8 Kh2 Na5 Ra1 Nc6 Ree1 Rg8 Ra2 Ra8 Kg1 Ree8 Raa1 Re7 Ra3 Ree8 Re2 Qf7 Ra1 Re7 exf6 Bxf6 Rxe7 Qxe7 axb5 axb5 Rxa8; 

After playing the solution 1.Nh2, the score rise. A demolition with 2.g4!! is coming in about all lines !

I'm slowly building all best lines in each positions to produce the PGN file ...

Here, after Nh2 :
33/74 35:01 18 945 402k 9 017k +1,26 1. ... Rc6 2.g4 hxg4 3.h5 Bc8 4.hxg6+ Kxg6 5.Qh4 fxe5 6.Qxd8 Rxd8 7.fxe5 Rh8 8.Nxg4 Be6 9.Bf4 Rcc8 10.Ne3 Nc6 11.Kf2 Ne7 12.Rg1+ Kf7 13.Rh1 Rcf8 14.Rag1 Rxh1 15.Rxh1 Rh8 16.Rxh8 Bxh8 17.Bg5 b5 18.axb5 axb5 19.Kg3 Bg7 20.Kf4 Ng6+ 21.Kf3
33/74 35:01 18 945 402k 9 017k +1,25 1. ... Rc7 2.g4 hxg4 3.h5 Bc8 4.hxg6+ Kxg6 5.Qh4 Rg8 6.Qxg4+ Kf7 7.Qh5+ Kf8 8.Bxf5 Rh8 9.Qg4 Bxf5 10.Qxf5 Nc6 11.Rf2 Qc8 12.Qg4 Rh3 13.Bd2 Qxg4+ 14.Nxg4 f5 15.Ne3 Ne7 16.Rh2 Rxh2 17.Kxh2 Rc6 18.Be1 Rh6+ 19.Kg2 Kf7 20.Bg3 Ke6 21.Rg1 Kf7 22.Kf3 Rh3 23.Ke2 Ke6 24.Kd2 Kf7
33/74 35:01 18 945 402k 9 017k +1,10 1. ... Nd7 2.g4 fxg4 3.f5 Kh8 4.fxg6 fxe5 5.Nxg4 hxg4 6.h5 e4 7.h6 Qf6 8.hxg7+ Kxg7 9.Bh6+ Kxh6 10.Qh2+ Kxg6 11.Rxf6+ Nxf6 12.Rf1 Re6 13.Bd1 Rg8 14.Qf4 Bc8 15.b3 b5 16.bxc4 bxc4 17.a5 Bd7 18.Qf5+ Kg7 19.Bc2 Kh6 20.Kg2 Rg6 21.Ba4 Re7 22.Bxd7 Rxd7 23.Qe6
33/74 35:01 18 945 402k 9 017k +1,07 1. ... Rh8 2.g4 hxg4 3.h5 Kg8 4.hxg6 Qd7 5.Qg2 Rf8 6.Rae1 Bc8 7.Bd2 fxe5 8.fxe5 Qc6 9.Rf2 Qxg6 10.Rf4 Rh4 11.e6 Bxe6 12.Rxg4 Rxg4 13.Nxg4 Qxg4 14.Rxe6 Rf6 15.Rxf6 Qxg2+ 16.Kxg2 Bxf6 17.Bxf5 Kf7 18.Bc8 b5 19.a5 b4 20.Bf4 bxc3 21.bxc3 Nc6 22.Bc7 Ke7 23.Bxa6 Bxd4 24.cxd4 c3 25.Bf4 Nxa5 26.Bg5+ Ke6 27.Kf3

Last word about this with SF at depth 44/81 : Nh2 and g4 are the same "best sequence" by transposition.

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 44/81	7:32:23	259 751 274k	9 570k	+0,61	1.Bd2 Rc7 2.Rfb1 Nc6 3.b4 b5 4.Re1 Rce7 5.g3 Qd7 6.axb5 axb5 7.Rec1 Qc7 8.Ra2 Qb6 9.Rca1 Nd8 10.Ra5 Nf7 11.Bd1 Kg8 12.Ra7 Nh6 13.Nh2 Re6 14.Bf3 R6e7 15.R1a5 Ng4 16.Nxg4 hxg4 17.Bg2 Qc6 18.Be3 Bc8 19.Ra8 Bb7 20.Rxe8+ Rxe8 21.Qb2 Re7 22.Ra7 Re8 23.Qd2 Re7 24.Ra5 Re8
 44/81	7:32:23	259 751 274k	9 570k	+0,78	1.Nh2 Rh8 2.g4 hxg4 3.h5 Kg8 4.hxg6 Qd7 5.Bd2 Nc6 6.Rae1 Ne7 7.Nxg4 Rc6 8.exf6 Bxf6 9.Rxe7 Bxe7 10.Ne5 Qc8 11.Nxc6 Bxc6 12.Qe2 Bf6 13.Rf2 Rh6 14.Rh2 Rxg6+ 15.Kf1 Bg7 16.Rh5 Bd7 17.Rg5 Qc6 18.Qe7 Rxg5 19.Qd8+ Kh7 20.fxg5 Qe6 21.Qb8 Be8 22.Bd1 Qe4 23.Kf2 Qd3 24.Qf4 Kg8 25.Bf3 Bf7 26.Qe3 Qxe3+ 27.Kxe3 Kh7 28.Kf4 Kg6
 44/81	7:32:23	259 751 274k	9 570k	+0,87	1.g4 hxg4 2.Nh2 Rh8 3.h5 Kg8 4.hxg6 Qd7 5.Bd2 Nc6 6.Rae1 Ne7 7.Nxg4 Rc6 8.exf6 Bxf6 9.Rxe7 Bxe7 10.Ne5 Qc8 11.Nxc6 Bxc6 12.Qe2 Bf6 13.Rf2 Rh6 14.Rh2 Rxg6+ 15.Kf1 Bg7 16.Rh5 Bd7 17.Rg5 Rxg5 18.fxg5 Qc6 19.Qh5 Qe6 20.g6 Kf8 21.Bh6 Qf6 22.Bf4 Qe6 23.Kf2 a5 24.Bh6 Qf6 25.Bxg7+ Qxg7 26.Kf3 Qf6 27.Qh6+ Qg7 28.Qh7 Be6 29.Kf4

[Vinvin]

Any update?

At least, yes !
Here are some conclusions. Still some doubt about some positions, if you have the main line, please post it :

Code: Select all

Too easy : r3k3/1b1q1p2/p1pPp2r/1p5p/n2P2pP/1Q1B2B1/5PPK/R2R4 w q - id ?; bm d5;
Noot good : 8/8/8/2pK3p/8/5N2/1P4pq/5Rbk w - - id ?; bm Rb1;
Hard OK : 1r1b4/n2b3k/1p1Np1p1/p2pP1Pp/P2P1P2/1PBN4/6K1/2R5 w - - id ?; bm f5;
Too easy : r1b2rk1/3nbpp1/p1p1p2p/8/3qN3/3B2B1/2P1Q1PP/3R1R1K w - - id ?; bm Ng5;
Too easy : r4rk1/pp2bppp/1nb5/q1pp2P1/5N1P/2P1BP2/PPPQB3/1K4RR w - - id ?; bm g6;
Good ! Found by H3tact : 8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - id ?; bm Bh5;
To verify : r2qrbk1/1b3p2/3p2pB/1p1P1N2/1np1P3/5NRP/1P3PP1/1B1Qn1K1 w - - id ?; bm N3h4;
Too easy : K7/p3p1p1/1p2p1p1/rp4B1/brpn4/Rnk5/8/4N1N1 w - - id ?; bm Bc1;
Very Hard OK : 5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - id ?; bm c8N;
Found 1 time with H3tact : 4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - id ?; bm Kc8;
Too easy : r5rk/1ppb1p1p/1n1p1q2/3Pb3/1PPNPpp1/3Q1P2/2B1N1PP/1R3RK1 b - - id ?; bm g3;
Very Hard OK : 2b2r2/2r2pbk/4n1pp/pp1pP3/2pP3q/P1P1B2P/1P1QNRPK/1B3R2 w - - id ?; bm Rf6;
Hard OK : brnq1rk1/5pp1/p2p4/Npn1p1RP/4P3/P4P2/1PPQB3/R2NK3 b - - id ?; bm Bxe4;
Too easy : r4rk1/3pbppn/1p3q1p/p2PpP2/4P1PP/P5Q1/1P2B3/1RB2R1K w - - id ?; bm g5;
Hard OK : 1r2kb1r/2q2ppp/p2pp3/6PB/1N2bP1P/2P1B2Q/PK6/3R3R b - - id ?; bm Rb4;
Very Hard OK : 2r1r1k1/2P2bp1/p1Q2pq1/2R3b1/1P6/4p1Bp/4B2P/3R3K w - - id ?; bm Qf3;
Too easy : 4rrk1/pppq2bp/6p1/3NpbB1/2Pn4/7P/PP1QBPP1/4RRK1 b - - id ?; bm Bxh3;
Too easy : 1r2k2r/1b3p2/p1qpp1np/1p2b1p1/4P3/2P1NP1P/PP1QBBP1/3RK2R w Kk - id ?; bm c4;
Too easy : 1r1n2k1/4b2p/1Pq2pp1/2p1p2P/p1N5/2P1BpPQ/P4P2/3R2K1 w - - id ?; bm b7;
Too easy : 8/4k2p/p1P5/1p2P3/2p5/P3K3/7P/8 w - - id ?; bm Ke4;
Seems not a good test other moves are good : b1r2r1k/1q2b1p1/n2p3p/1p1Pp3/nPN1Pp2/BQ3N1P/5PP1/R1R2BK1 w - - id ?; bm Ncxe5 Nfxe5;
Very Hard OK : 2r2r1k/1bqnbp1p/p3p1p1/npppP3/3P1PN1/1PPBBN2/P2Q2PP/R4RK1 w - - id ?; bm Ng5;
Not good : 2r2k2/1p1b1ppr/1q1p1np1/p1bp2B1/3N3P/P1PBRQ2/1P3PP1/R5K1 w - - id ?; bm Bxg6;
Too easy : r4rk1/1p1nq1p1/1ppp1p1p/1P2pP1B/n1P1P1P1/P2P3P/2QB4/R4RK1 w - - id ?; bm h4;
Too easy : r4rk1/5pp1/1pqpbn1p/p3p3/2P1P2n/P2BB1NP/1P1Q1PP1/R2R2K1 w - - id ?; bm Bxh6;
Too easy : r1b2r1k/4qp1p/p2ppb1Q/4nP2/1p1NP3/2N5/PPP4P/2KR1BR1 w - -id ?; bm Nc6;
Very very hard : 2q2r1k/p1p1b1pp/br1p1n2/2p1N1BP/Q1P1P3/8/PP1N1PP1/2KR3R w - - id ?; bm Ng6+;
Very very hard : r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - id ?; bm Rxh2;
Very hard : r5rk/1bq1bpp1/1p1ppn1p/pP5P/2P1P3/P1N2P2/1B1Q1P2/1K1R1BR1 w - - id ?; bm Nd5;
Very very Hard OK g4 or Nh2 : 1nrqr3/1b4bk/pp3pp1/3pPp1p/P1pP1P1P/2P1BN2/1PB2QP1/R4RK1 w - - id ?; bm Nh2;
Very very Hard OK : q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - id ?; bm Qd4+;
Hard OK : 2rb3r/R5pp/p2pk3/2n2p2/2P1PP2/B7/P2N3P/1R4K1 w - - id ?; bm e5;
Too easy : r2qkb1r/1p2pppp/1np2n2/4N1Nb/Pp6/6P1/2QP1PBP/R1B2RK1 w kq - id ?; bm a5;
Too easy : 3k4/8/1p1p4/pPp1q3/P1PbPpBr/1K1R4/4Q1Pr/5R2 b - - id ?; bm d5;
Very Hard OK : r4rk1/4bppp/bq2p3/npnpP3/p2B1P2/P1PB1N2/1P2QNPP/R4RK1 w - - id ?; bm Bxh7+;
Bad or I'm not able to see the winning line : 2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;
Very very hard : 2q1r1k1/b1r2pp1/p4np1/2np4/1Q6/4PP1P/P1B1N1P1/1RBR1K2 b - - id ?; bm Nce4;
Too easy : 8/PPPPPpPk/3rq3/1b1r2b1/2BR1B2/3RQ3/pppppPpK/8 w - - id ?; bm g8Q+;
Hard OK : kr1b4/p1p2B2/2p5/2p1p3/KpP1P3/1P4N1/8/7R w - - id ?; bm Rh6;
Hard OK : 4kb1r/2q2ppb/p2pp2p/5P2/NrPB2P1/1P3Q2/1K1R3P/7R w k - id ?; bm fxe6;
Not good : 2k5/1bbp1rp1/1q2r1Np/1Pp1Pp1P/R1Pp1B2/R4P2/1K1Q2P1/8 w - - id ?; bm Ra8;
Hard OK : rn2kbnr/pp2ppp1/2p5/3pP1Bp/3P3P/3Q4/PqP2PP1/RN2K1NR w KQkq - id ?; bm e6;
Bad : alot of moves are winning : r2q1rk1/pb1n1p2/4p3/1pp1P1p1/1bpP4/2N2NP1/PPQ1B1P1/3R1RK1 w - - id ?; bm d5;
Hard OK : 1k1n4/1p1b1p2/1Bp1pPp1/1PP1P3/8/6P1/8/1K6 w - - id ?; bm Bc7+;
Good move but enough ? To verify : 1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - id ?; bm Nf4;
Good move but enough (N3d4 is close) ? To verify : 1r2r1kb/2qn1p1p/3p2pB/pbpP1N2/1n2P3/R4N1P/1P3PP1/1BQ1R1K1 w - - id ?; bm Qf4;
To verify : 8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - id ?; bm Nc6;
Other moves very close b5 and Bxa6 : 1k2r2r/1p1qb2p/p1p1b1p1/P2pPp2/1P1P4/2RB4/2PBQ1PP/1R4K1 w - - id ?; bm Rcb3;
Too easy : rnb2rk1/1p1n1p1p/p3pp1Q/4q3/1bBN4/1RN5/P1P3PP/5RK1 w - - id ?; bm Nf5;
Too easy : r4rkb/1pn1qp1p/3p1npP/pPpP4/2P1PB1Q/3B4/1P2N1P1/R4RK1 w - - id ?; bm e5;
Too easy : 7r/pp1b1pk1/1b3qp1/7r/3pBP2/5Q1P/PP1B2P1/3RRK2 b - - id ?; bm Rxh3;
Hard OK : 2r2rk1/p3qbb1/Pp2p3/1N1p3p/3PnNpP/3B2P1/1P3P2/2RQ1RK1 w - - id ?; bm Rxc8;
Too easy : b1r1q3/3r1pk1/2p1pRp1/ppP1P1Pp/3P3P/P2BP3/2Q5/5RK1 w - - id ?; bm Rxg6;

[Paloma]

Thanks Vincent,

I have only a small Core2Duo (a new rig is in planning ) but i will examine some positions.