TalkChess.com

Yet as for difficult tactical positions time to solution doesn't get as much better, as one is used to see with old-fashioned learning files like the ones, e.g. SF-PA had. Especially for Zugzwang- studies it's still some kind of luck, if and how much hash- entries are stored usefully or not, depend...

amchess wrote: ↑

Sat Sep 07, 2019 1:44 pm

Have fun!

Thanks, Andrea!

Works without move- history (opening moves leading to position of interest) now too, that's fine!

Hi Mike! Analysis by the soon to be released Honey X5i SF dev. default (Analysis Contempt 24 Both), no tbs: 3r2k1/5pp1/p3p2p/1pq5/5P2/PP6/1P3RPP/5Q1K b - - 0 1 Analysis by Brainfish 210819 64 POPCNT: 28...Qd5 29.b4 Qb3 30.Qg1 Rd1 31.Rf1 Rxf1 32.Qxf1 -+ (-1.95) Depth: 7/7 00:00:00 40kN 28...Qd5 29.Qe...

Here's what Stockfish-dev gives with MultiPV = 2 in the position after 24...Rec8 25. Nd2 r1r3k1/3b1ppp/8/1p1p4/nPpP1BP1/4P2P/P2N1P2/2Q3K1 b - - 2 2 -3.31 2... h5 3. gxh5 c3 4. Nb3 c2 5. Nc5 Bf5 6. e4 Bxe4 7. f3 Bf5 8. Qa1 f6 9. Kf2 Kf7 10. Nb7 Ra6 11. Nc5 Ra7 12. h6 gxh6 13. Nxa4 Rxa4 14. a3 h5 15....

My Stockfish-dev now agrees that 25. Nd2 should be met with 25...h5. In fact, the response is strong enough that 25. Nd2 has been replaced with 25. Na3. So now I have 24...Rec8 25. Na3 c3, and so 24...c3 and 24...Rec8 are back to being equivalent by transposition. Can you confirm this? Not quite, L...

Hi Lous! A deep new search with Stockfish-dev suggests that c3 might indeed be the "best" move here: -3.69 1... c3 2. Na3 Rec8 3. Nc2 Nb2 4. a3 h5 5. f3 hxg4 6. hxg4 Nc4 7. Kh2 Ra6 8. Kg3 f6 9. e4 dxe4 10. fxe4 Be8 11. d5 Bg6 12. a4 Rxa4 13. Nd4 c2 14. Qxc2 Ra3+ 15. Kf2 Rca8 16. Ne2 Ra2 17. Qd1 Nb2 ...

Black appears to be in zugzwang. Most engines won't find it then. Even with null-move pruning disabled, Stockfish isn't finding anything ... yet: SugaR started with empty hash, 24 threads of a 12x3GHz CPU, 32Gb hash, nullmove disabled, ICCF3 (int.MV- mode 8): 1N1n4/2BPbpPb/3r1p2/2p1kP2/2p1p1P1/2p1P...

Forward/backward analysis isn't even needed here. Stockfish-dev with 6-man tables finds a tablebase win in a direct search from the root position in about 7.5 minutes I know, I just went into the lines to see the Losomosov- positions asap and take the way to them backward in hash, not so much as fo...

Pity very long till fail highs get solved to next iteration, had to leave and paste that for now but will let it go on running. ... 8/5p2/1R2bk2/8/4PK2/1p6/6P1/8 w - - 0 1 Analysis by CfishR 050819 x64 POP NL: ... 55.Rb7 Bc4 56.Rb6+ Be6 57.Rb5 Ke7 58.Rb7+ Kd6 59.Ke3 Ke5 60.Rb5+ Kd6 61.Kd4 Ke7 62.Rb...

8/5p2/1R2bk2/8/4PK2/1p6/6P1/8 w - - 3 55 Guess that's lost for Black, isn't it? After some Forward- Backward with 6 men Syzygys: 8/5p2/1R2bk2/8/4PK2/1p6/6P1/8 w - - 0 1 Analysis by Cfish 050819 x64 POP N: .., 55.Ke3 Ke5 56.Ra6 Bd7 57.Ra5+ Kd6 58.Ra3 Be6 59.Ra7 Ke5 60.Ra5+ Kf6 61.Ra4 Kg7 62.Kf3 Kf6 ...