More problems that are hard on SF

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Dann Corbit
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More problems that are hard on SF

Post by Dann Corbit »

Code: Select all

1r2kb1r/2q2ppp/p2pp3/6PB/1N2bP1P/2P1B2Q/PK6/3R3R b - -
1r3bk1/5pp1/3p3p/p2NpP1Q/q2nP3/1p1PB2P/1Pr3PK/1R3R2 w - -
1r4k1/r1b3p1/1p1pppP1/qbPP4/n7/2P5/PP3P2/KQ3RRR w - -
1r6/4n2p/pn1kp3/1BpbR3/1Bp5/K4N2/3N3P/8 w - -
1rb2rk1/q2nbppp/4p3/p1p1P2Q/Ppp1NB1P/6P1/1P3PB1/R2R2K1 w - -
2B5/8/5n1p/5Kp1/6N1/2b1p3/5PpR/5k2 w - -
2BK4/3P4/1k6/5P1p/5nrP/2B5/N6p/8 w - -
2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - -
2R5/k1p1p1K1/P1p1Pp2/5P2/7P/pB6/2p5/2r5 w - -
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -
Big scores.
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MOBMAT
Posts: 385
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Re: More problems that are hard on SF

Post by MOBMAT »

are these solvable mates?
i7-6700K @ 4.00Ghz 32Gb, Win 10 Home, EGTBs on PCI SSD
Benchmark: Stockfish15.1 NNUE x64 bmi2 (nps): 1277K
AndrewGrant
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Full name: Andrew Grant

Re: More problems that are hard on SF

Post by AndrewGrant »

2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -
Ethereal 10.64
info depth 30 seldepth 44 score mate 12 time 49040 nodes 2310560460 nps 47114000 tbhits 0 hashfull 339
pv g3h5 g6h5 e3g3 f6g6 f5g6 c6d7 c8d8 d6d5 g6h7 g7h7 g3g8 h7h6 g8f7 d5f5 d8h8 h6g5 f7g7 g5f4 g7d4 f4g5 h8g8 g5h6 d4g7

Stockfish-dev
info depth 32 seldepth 59 multipv 1 score mate 12 nodes 1873708808 nps 37978531 hashfull 997 tbhits 0 time 49336
pv g3h5 g6h5 e3g3 f6g6 f5g6 d6g6 g3e5 g7h6 c8c7 c6e8 e5e8 g6f6 e8e5 h6g6 e5g3 g6h6 h3h4 f6f5 c7c6 f7f6 c6f6 f5f6 g3g5
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F. Bluemers
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Re: More problems that are hard on SF

Post by F. Bluemers »

I tried these for a couple of minutes,here are the mates Dirty found:
1r4k1/r1b3p1/1p1pppP1/qbPP4/n7/2P5/PP3P2/KQ3RRR w - -
20 100013 7326 101554186 Rh8+ Kxh8 Rh1+ Kg8 Rh8+ Kxh8 Rh1+ Kg8 Rh8+ Kxh8 Qh1+ Kg8 Qh7+ Kf8 Qh8+ Ke7 Qxg7+ Kd8 c6 Bxc6 dxc6 Ke8 Qd7+ Kf8 Qf7#
2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - -
29 100010 11075 193761084 Nb6 axb6 a7 b5 a8=B bxc4 Bae4 c3 Bxd3 cxd2 Bf1 d3 Kc4 d1=Q Rxd1 d2 Kb5 Bf2 B1xg2#
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -
22 100012 4110 80161541 Nh5+ gxh5 Qg3+ Qg6 fxg6 Rxg6 Qe5+ Kh6 Rc7 Rxg2+ Kf1 Bd5 Qxd5 Rg7 h4 d3 Qd6+ Rg6 Qf4+ Kg7 Qxf7+ Kh6
(12Qxh7#) is chopped from the pv for some reason
zullil
Posts: 6442
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Full name: Louis Zulli

Re: More problems that are hard on SF

Post by zullil »

AndrewGrant wrote: Sun Jul 22, 2018 3:26 am
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -
Ethereal 10.64
info depth 30 seldepth 44 score mate 12 time 49040 nodes 2310560460 nps 47114000 tbhits 0 hashfull 339
pv g3h5 g6h5 e3g3 f6g6 f5g6 c6d7 c8d8 d6d5 g6h7 g7h7 g3g8 h7h6 g8f7 d5f5 d8h8 h6g5 f7g7 g5f4 g7d4 f4g5 h8g8 g5h6 d4g7

Stockfish-dev
info depth 32 seldepth 59 multipv 1 score mate 12 nodes 1873708808 nps 37978531 hashfull 997 tbhits 0 time 49336
pv g3h5 g6h5 e3g3 f6g6 f5g6 d6g6 g3e5 g7h6 c8c7 c6e8 e5e8 g6f6 e8e5 h6g6 e5g3 g6h6 h3h4 f6f5 c7c6 f7f6 c6f6 f5f6 g3g5
Stockfish-dev with 1 thread (deterministic search) and 4 GB hash. No endgame tables and analysis contempt off. Takes a while ...

Code: Select all

info depth 44 seldepth 75 multipv 1 score mate 12 nodes 4784358482 nps 2325740 hashfull 999 tbhits 0 time 2057133 pv g3h5 g6h5 e3g3 f6g6 f5g6 d6g6 g3e5 g7h6 c8c7 g6g2 g1f1 c6d5 e5d5 g2g6 d5f7 h6g5 c7c5 g5h4 f7f4 g6g4 h3g4 h5g4 f4h2
Colin-G
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Location: England

Re: More problems that are hard on SF

Post by Colin-G »

In the past I have found Critter gives the best results when analysing various positions.
On a 3 Ghz cpu using single core it found the mate for position 3 in 1 second and the mate in position 10 in 8 seconds.
No mates were found within 1 minute for the other 8 positions.
I do not know if it actually found the correct move for any of those 8 positions since the best move was not given in the original file.
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Eelco de Groot
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Re: More problems that are hard on SF

Post by Eelco de Groot »

zullil wrote: Sun Jul 22, 2018 12:56 pm
AndrewGrant wrote: Sun Jul 22, 2018 3:26 am
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -
Ethereal 10.64
info depth 30 seldepth 44 score mate 12 time 49040 nodes 2310560460 nps 47114000 tbhits 0 hashfull 339
pv g3h5 g6h5 e3g3 f6g6 f5g6 c6d7 c8d8 d6d5 g6h7 g7h7 g3g8 h7h6 g8f7 d5f5 d8h8 h6g5 f7g7 g5f4 g7d4 f4g5 h8g8 g5h6 d4g7

Stockfish-dev
info depth 32 seldepth 59 multipv 1 score mate 12 nodes 1873708808 nps 37978531 hashfull 997 tbhits 0 time 49336
pv g3h5 g6h5 e3g3 f6g6 f5g6 d6g6 g3e5 g7h6 c8c7 c6e8 e5e8 g6f6 e8e5 h6g6 e5g3 g6h6 h3h4 f6f5 c7c6 f7f6 c6f6 f5f6 g3g5
Stockfish-dev with 1 thread (deterministic search) and 4 GB hash. No endgame tables and analysis contempt off. Takes a while ...

Code: Select all

info depth 44 seldepth 75 multipv 1 score mate 12 nodes 4784358482 nps 2325740 hashfull 999 tbhits 0 time 2057133 pv g3h5 g6h5 e3g3 f6g6 f5g6 d6g6 g3e5 g7h6 c8c7 g6g2 g1f1 c6d5 e5d5 g2g6 d5f7 h6g5 c7c5 g5h4 f7f4 g6g4 h3g4 h5g4 f4h2
For depth 32 that is a lot of nodes (in Andrew's Stockfish dev) but depth 32 is very good. There is probably lots of variability here.

Kaissa 010 and 007 are not good but 009 was prety fast again. Mostly luck I suppose. Also 009 has the lower bench number so I think this one might be better than 010.Yeah right. 009 is one change less than 010. Don't put in too many changes...

2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - -

Engine: Kaissa IV 009 (one thread, 512 MB, i76700)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

21/35 0:01 +1.20 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxf2+
5.Kxf2 Rxd3 6.Rc7 Bb5 7.fxg6 hxg6
8.Ne4 Rd7 9.Rxd7 Bxd7 10.Nc5 Bc6
11.g3 g5 12.Ke3 Bg2 13.h4 gxh4
14.gxh4 (3.097.460) 2104

22/31 0:01 +1.04 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxf2+
5.Kxf2 Rxd3 6.Rc7 a6 7.f6+ Kxf6
8.Ne4+ Ke7 9.Nc5 Rd6 10.Ke3 a5
11.Ra7 Rd5 12.Nxd7 Rxd7 13.Rxa5 (3.862.746) 2123

23/35 0:02 +1.20 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxf2+
5.Kxf2 Rxd3 6.Rc7 Bb5 7.fxg6 hxg6
8.Ne4 Rd7 9.Rxd7 Bxd7 10.Ke3 Bc6
11.g3 f5 12.Nc5 Kf6 13.h4 Bg2 14.Kd4 (6.555.104) 2188
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.
35/43 0:46 +0.96 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxd3
5.Kh2 Qd4 6.Qxd4+ Rxd4 7.Ra5 Bc6
8.f6+ Kh6 9.Ra6 Bd5 10.Nf1 Re4
11.Ra5 Bc6 12.g4 Re2+ 13.Kg3 g5
14.h4 (101.221.403) 2199

36/48 0:51 +0.89-- 1.Qe2 Bd7 (114.069.934) 2205

36/48 0:54 +0.92 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxd3
5.Kh2 Qd4 6.Qxd4+ Rxd4 7.Ra5 Bc6
8.fxg6 hxg6 9.Ra6 Bd5 10.Ne2 Rd2
11.Nf4 Be4 12.h4 Bb1 13.a3 Rd7
14.Kg3 (119.363.778) 2201

37/54 0:58 +1.00++ 1.Qe2 (129.936.268) 2206

37/54 1:03 +1.01 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxd3
5.Kh2 Qd4 6.Qxd4+ Rxd4 7.Ra5 Bc6
8.fxg6 hxg6 9.Ra6 Bd5 10.Ne2 Rd2
11.Nf4 Be4 12.h4 Rf2 13.Kg3 Rb2
14.Rxa7 (140.279.646) 2207

38/53 1:09 +0.94-- 1.Qe2 Bd7 (154.378.384) 2211

38/53 1:14 +1.01++ 1.Qe2 (164.750.213) 2211

38/53 1:23 +0.95 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxd3
5.Kh2 Qd4 6.Qxd4+ Rxd4 7.Ra5 Bc6
8.fxg6 hxg6 9.Ra6 Bd5 10.Ne2 Rd2
11.Nf4 Be4 12.h4 Rf2 13.Kg3 Rb2
14.Rxa7 (184.904.807) 2225

39/50 1:33 +1.03++ 1.Qe2 (209.518.770) 2231

39/57 1:47 +1.04 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxf2+
5.Kxf2 Rxd3 6.Rc7 a5 7.fxg6 hxg6
8.Ne2 Be8 9.Rc5 a4 10.bxa4 Bxa4
11.Nc3 Rd4 12.Ke3 Rb4 13.Rc7 Kf8
14.Kd3 (239.877.338) 2234

40/48 1:55 +0.96-- 1.Qe2 Bd7 (257.334.634) 2237

40/48 2:09 +0.89-- 1.Qe2 Bd7 (291.253.208) 2241

40/48 2:23 +0.96++ 1.Qe2 (321.745.343) 2245

40/55 2:34 +0.96 1.Qe2 Bd7 2.Rc5 d3 3.cxd3 Qd4+ 4.Qf2 Qxf2+
5.Kxf2 Rxd3 6.Rc7 Rd2+ 7.Kg1 Rd1+
8.Kh2 a6 9.fxg6 hxg6 10.Ne4 Be6
11.Rc2 Rd4 12.Ng5 Bd5 13.Nf3 Rd1
14.Kg3 (348.296.340) 2250

41/41 2:41 +0.89-- 1.Qe2 Bd7 (363.967.796) 2250


41/43 2:48 +0.96++ 1.Nh5+ (380.083.785) 2254

41/43 2:48 +1.07++ 1.Nh5+ (380.767.246) 2254

41/43 2:49 +1.22++ 1.Nh5+ (382.135.786) 2255

41/43 2:50 +1.40++ 1.Nh5+ (383.839.379) 2255

41/43 2:50 +1.64++ 1.Nh5+ (384.973.617) 2255

41/43 2:51 +1.94++ 1.Nh5+ (385.728.548) 2255

41/43 2:52 +2.30++ 1.Nh5+ (388.860.763) 2256

41/43 2:52 +2.73++ 1.Nh5+ (389.620.372) 2256

41/43 2:52 +3.25++ 1.Nh5+ (390.423.040) 2256

41/43 2:53 +3.87++ 1.Nh5+ (392.521.510) 2257

41/43 2:54 +4.61++ 1.Nh5+ (393.679.515) 2258

41/43 2:54 +5.48++ 1.Nh5+ (394.870.851) 2260

41/43 2:55 +6.50++ 1.Nh5+ (395.866.284) 2261

41/43 2:55 +7.70++ 1.Nh5+ (397.148.623) 2262

41/43 2:56 +9.11++ 1.Nh5+ (398.927.109) 2266

41/43 2:57 +10.75++ 1.Nh5+ (402.684.367) 2273

41/43 2:58 +12.65++ 1.Nh5+ (407.031.889) 2282

41/43 3:02 +14.86++ 1.Nh5+ (423.181.206) 2313

41/43 3:08 +17.42++ 1.Nh5+ (442.176.918) 2350

41/43 3:17 +20.39++ 1.Nh5+ (476.083.509) 2409

41/43 3:22 +23.82++ 1.Nh5+ (492.974.493) 2437

41/43 3:25 +27.80++ 1.Nh5+ (504.786.265) 2454

41/43 3:27 +32.38++ 1.Nh5+ (512.311.396) 2466

41/43 3:28 +37.68++ 1.Nh5+ (515.431.350) 2471

41/43 3:29 +43.79++ 1.Nh5+ (518.354.152) 2475

41/43 3:30 +50.83++ 1.Nh5+ (521.355.486) 2480

41/43 3:36 +58.95++ 1.Nh5+ (542.375.150) 2506

41/43 3:38 +68.32++ 1.Nh5+ (551.643.835) 2520

41/43 3:40 +M48++ 1.Nh5+ (556.814.035) 2528

41/46 3:43 +M16 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Qf4+ Kg7 6.Qxd4+ Kh6
7.Rc7 Be8 8.Qe3+ Kg7 9.Qxe8 Rf6
10.Qe5 Kg6 11.Rc8 h6 12.Qg3+ Kf5
13.Rc5+ Ke6 14.Qe5+ (567.773.872) 2542

42/32 3:48 +M15 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Bd7
4.gxh7+ Kxh7 5.Qg8+ Kh6 6.Qf8+ Kg6
7.Qxd6+ Be6 8.Rg8+ Kf5 9.Qxd4 h4
10.Qe3 f6 11.Qc5+ Ke4 12.Re8 Kf4
13.Rxe6 a5 14.Qh5 (585.435.636) 2562

43/30 3:51 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (595.475.440) 2575

44/24 3:52 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (600.140.716) 2581

45/24 3:54 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (606.090.156) 2587

46/24 3:57 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (617.484.731) 2597

47/24 4:00 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (625.830.061) 2605
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63/24 7:44 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (1.431.966.354) 3082

64/24 8:13 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (1.534.689.754) 3112

65/24 9:12 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (1.748.479.200) 3167

66/24 9:58 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (1.909.045.188) 3192

67/24 12:41 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (2.533.144.242) 3328

68/24 20:48 +M12 1.Nh5+ gxh5 2.Qg3+ Qg6 3.fxg6 Rxg6
4.Qe5+ Kh6 5.Rc7 Be8 6.Qxe8 Rf6
7.Qe5 Kg6 8.Qg3+ Kh6 9.h4 Rf5
10.Rc6+ f6 11.Rxf6+ Rxf6 12.Qg5+ (4.594.017.529) 3681


best move: Ng3-h5 time: 20:48.203 min n/s: 3.681.003 nodes: 4.594.017.529
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
MikeGL
Posts: 1010
Joined: Thu Sep 01, 2011 2:49 pm

Re: More problems that are hard on SF

Post by MikeGL »

Maybe tuning of king safety eval might get this one quickly.
ref first position

[pgn] [Event "?"] [Site "?"] [Date "2018.07.23"] [Round "?"] [White "Analysis"] [Black "Stockfish8"] [Result "0-1"] [WhiteElo "2400"] [TimeControl "1800+30"] [SetUp "1"] [FEN "1r2kb1r/2q2ppp/p2pp3/6PB/1N2bP1P/2P1B2Q/PK6/3R3R b - - 0 1"] [Termination "unterminated"] [PlyCount "9"] [WhiteType "human"] [BlackType "human"] 1. ... Rxb4+ 2. cxb4 Qc2+ 3. Ka3 Qc3+ 4. Ka4 Bc2+ 5. Ka5 Be7 [+-] [/pgn]
I told my wife that a husband is like a fine wine; he gets better with age. The next day, she locked me in the cellar.
Dann Corbit
Posts: 12537
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: More problems that are hard on SF

Post by Dann Corbit »

With solutions:

Code: Select all

2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - acd 21; acs 270; bm Nb6; c3 "Nb6"; ce 32748; dm 10; id "Sting.Iq.02"; pm Nb6; pv Nb6 axb6 a7 b5 a8=B bxc4 Bae4 c3 Bxd3 cxd2 Bf1 d1=Q Rxd1 d3 Kc4 d2 Kb5 Bf2 B1xg2+; 
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - - acd 66; acs 733; bm Nh5+; c3 "Nh5+"; ce 32744; dm 12; pm Nh5+; pv Nh5+ gxh5 Qg3+ Qg6 fxg6 Rxg6 Qe5+ Kh6 Rc7 Rxg2+ Kf1 Bd7 Kxg2 Kg6 Rxd7 f6 Rd6 h6 Qxf6+ Kh7 Qf7+ Kh8 Rxh6+; 
1r4k1/r1b3p1/1p1pppP1/qbPP4/n7/2P5/PP3P2/KQ3RRR w - - acd 27; acs 174; bm Rh8+; c0 "http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=10161"; c3 "Rh8+"; ce 32742; dm 13; pm Rh8+; pv Rh8+ Kxh8 Rh1+ Kg8 Rh8+ Kxh8 Rh1+ Kg8 Rh8+ Kxh8 Qh1+ Kg8 Qh7+ Kf8 Qh8+ Ke7 Qxg7+ Ke8 c6 Bxc6 dxc6 Bd8 Qg8+ Ke7 Qf7+; 
2B5/8/5n1p/5Kp1/6N1/2b1p3/5PpR/5k2 w - - acd 36; acs 333; bm Ba6+; c3 "Ba6+"; ce 4258; pm Ba6+; pv Ba6+ Kg1 Bb7 Ne8 Rxg2+ Kf1 Nxe3+ Ke2 Kg6 Ba5 Kxh6 Nd6 Bd5 Bd8 Kg6 Nc8 Nf5 Kd3 Rxg5 Nb6 Ne3 Kc3 Rg4 Nd7 Bc6 Nf8+ Kf5 Nh7 Nd5+ Kd2 Rg8 Bh4 Rg7 Nf8 Rf7 Ne6 Kxe6 Kc2 Bb5 Bd8 Kf5 Ba5 Ne3+ Kc3 Rh7 Kb4 Bc4; 
2R5/k1p1p1K1/P1p1Pp2/5P2/7P/pB6/2p5/2r5 w - - acd 51; acs 333; bm Bxc5+; c1 "diff=5"; c3 "Rxc7+"; ce 1775; id "hard2018.07"; pm Bxc5+; pv Rxc7+ Kxa6 Rxc6+; 
2BK4/3P4/1k6/5P1p/5nrP/2B5/N6p/8 w - - acd 31; acs 333; bm Bd4+; c3 "Bd4+"; ce 1553; pm Bd4+; pv Bd4+; 
1r3bk1/5pp1/3p3p/p2NpP1Q/q2nP3/1p1PB2P/1Pr3PK/1R3R2 w - - acd 40; acs 333; bm Bxh6; c3 "Bxh6"; ce 835; pm Bxh6; pv Bxh6; 
1r2kb1r/2q2ppp/p2pp3/6PB/1N2bP1P/2P1B2Q/PK6/3R3R b - - acd 39; acs 333; bm Rxb4+; c3 "Rxb4+"; ce 770; pm Rxb4+; pv Rxb4+ cxb4 Qc2+ Ka3 Qc3+ Ka4 Bc2+ Ka5 Be7 Qxe6 g6 Qd5 Bd8+ Kxa6 Qa3+ Kb7 Qxb4+ Ka7 Be4 Qxe4+ Qxe4 Bd4 Qc2 Rhe1+ Kf8 Bf3 f6 Rb1 Qa4+ Kb8 Qxd4 Rec1 Qxf4 Rc8 Ke7 Rb7+ Ke6 Bc6 d5+ Ka7 Qxh4 Bd7+ Ke5 gxf6 Qf2+ Kb8 Qxf6 Bb5 Ba5 Rxh8 Qxh8+ Ka7 Qf6 a4 h5 Kb8 g5 Rd7 Qb6+ Kc8; 
1rb2rk1/q2nbppp/4p3/p1p1P2Q/Ppp1NB1P/6P1/1P3PB1/R2R2K1 w - - acd 41; acs 333; bm Rxd7; c3 "Rxd7"; ce 285; pm Rxd7; pv Rxd7; 
1r6/4n2p/pn1kp3/1BpbR3/1Bp5/K4N2/3N3P/8 w - - acd 48; acs 333; bm Bxc5+; c3 "Bxc5+"; ce 245; pm Bxc5+; pv Bxc5+ Kc7 Bxb6+ Rxb6 Bxc4 Rd6 Bxd5 Nxd5 Ne4 Rd7; 
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.
Jouni
Posts: 3279
Joined: Wed Mar 08, 2006 8:15 pm

Re: More problems that are hard on SF

Post by Jouni »

Matefinder solves all 10 but one takes a lot time. Solution times:

30s
41s
38s
47s
8m44s
0s
0s
35s
5s
3s

Position 5 analysis
...
1.Kf7 a2 2.Rxc7+ Kb6 3.Rb7+ Kxa6 4.Rb4 a1Q 5.Ra4+ Qxa4 6.Bxa4 Ka5 7.Bxc2 Rxc2 8.Kxe7 c5 9.Kxf6 c4 10.e7 Re2 11.Kf7 c3 12.e8Q Rxe8 13.Kxe8
= (0.00) Depth: 38/26 00:06:14 3178mN, tb=49111868
1.Rxc7+
= (0.07 ++) Depth: 39/48 00:08:44 4590mN, tb=61644253
1.Rxc7+
= (0.15 ++) Depth: 39/48 00:09:01 4802mN, tb=62632269
1.Rxc7+
= (0.26 ++) Depth: 39/50 00:09:16 4980mN, tb=63155021
1.Rxc7+
+/= (0.42 ++) Depth: 39/50 00:09:26 5107mN, tb=63488249
1.Rxc7+
+/= (0.63 ++) Depth: 39/50 00:09:34 5181mN, tb=64019274
1.Rxc7+
+/- (0.92 ++) Depth: 39/51 00:09:50 5319mN, tb=65317659
1.Rxc7+
+/- (1.31 ++) Depth: 39/52 00:10:05 5453mN, tb=66504612
1.Rxc7+
+- (1.81 ++) Depth: 39/52 00:10:25 5622mN, tb=67842500
1.Rxc7+
+- (2.45 ++) Depth: 39/52 00:10:49 5823mN, tb=70058984
1.Rxc7+
+- (3.28 ++) Depth: 39/52 00:11:22 6112mN, tb=72833606
1.Rxc7+
+- (4.33 ++) Depth: 39/53 00:11:57 6455mN, tb=76018718
Jouni