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Now Kaissa seems to get stuck a little here Louis... :o Assuming I entered the line correctly into Uly's pgn so far. Could it be a tablebase thing? But 63...Be4 seems just a wrong move... Or is it just because you disabled nullmove in CFish? That I can believe, if it is some sort of Zugzwang and Sto...

8/3b2k1/1p3pp1/3p1p2/3P1P2/P3P3/5KP1/5B2 b - - At depth 100/187 SF dev finally shows +2.96 with analysis contempt on (c=24 so real eval is probably around +3.2 is my guess). So this might just be mate in N from this position. I doubt that this position is a win for White. Black should simply avoid ...

I can see that the difference is in the following position 8/1k6/5pB1/K2p1pp1/3P1P2/3bP1P1/8/8 w - - 11 67 Here g4 is not good and without the pawns g5 e3 the move g4 is winning. I think you are right Uri, with pawns g5 and e3 still on board Uly would have just drawn that particular position. 8/2k5...

Could be Uri but does Stockfish see that too? Without tablebases I don't think everything is reliable on my end. Black loses the move g4-g5 (Zwischenzug is that the right word?) though so that maybe changes the Zugzwang situation if he takes gxf4?

(Between moves 50 and 60) Judging by the 0.95 scores here, at move 53 Kaissa thinks Stockfish blundered away the half point (quickly sees that 53..gxf4 is wrong) and this still draw: 8/K1k5/1p3p2/3p1pp1/3P1P2/PB1bP1P1/8/8 b - - Engine: Kaissa IV NoContempt (512 MB) by T. Romstad, M. Costalba, J. Kii...

Stockfish end of 2017 can't have been all that bad :roll: What did it miss? At move 50 Kaissa with no tablebases thinks this about drawish: 4B3/K1k5/1p3pp1/3p1p2/3P1P2/P2bP3/6P1/8 b - - Engine: Kaissa IV NoContempt (one thread, version 154B, 512 MB) by T. Romstad, M. Costalba, J. Kiiski, G. Linscott...

If you make very small changes, with one thread the time to solution greatly varies so mainly search luck seems important. With many threads the chance of success is of course higher so SF not finding it quickly with one thread maybe does not matter very much. I could not find something easily repai...

Kaissa thinks that e4 and d5 can transpose, but definitely no 0.00 eval for both. This is with Multi PV started after the single line search, so it can profit from that first search. The PV is now more similar to that of Louis's CFish. No tablebases though that can make a difference and there are so...

Strange, only -0.20 eval with Stockfish? I do get the same d5 (eventually) but the evals are much lower here? r2qkb1r/1b3ppp/p3pn2/1p6/2pP4/2N1PN2/PPQ2PPP/R1BR2K1 w kq - Engine: Kaissa IV NoContempt (one thread, search 035, 512 MB) by T. Romstad, M. Costalba, J. Kiiski, G. Linscott 19/27 0:01 -0.69 ...

Sorry to interrupt the monologue Henk but aren't you making things worse searching files that are important to you with only ancient Dos tools. Nice to learn Dos but ancient, books you need were in De Slegte but De Slegte is also out of business... All the while any fruitless search will increase yo...