question about a study BY Troitsky

[Jouni]

Huntsman is stunning in this and usually has mate in 1-2 second.

Analysis by The Huntsman 1:

1.Be1 d5 2.Kg7 d4 3.Kf8 Rh6 4.Ke7 Rh5 5.Kd8 Rh6 6.Kc7 Rh5 7.Kb6 Rh6 8.Ka5 Rh5 9.Kb4 Rh6 10.Ka3 Rh5 11.Kb2 Rh6 12.Kc2 Rh5 13.Kc1 Rh6 14.Kb2 Rh5 15.Ka3 f6 16.Kb4 Rh6 17.Ka5 Rh5 18.Kb6 Rh6 19.Kc7 Rh5 20.Kd8 Rh6 21.Ke7 Rh5 22.Kf8 Rh6 23.Kg7 Rh5 24.Kg8 Rh6 25.Kf8 Rh5 26.Kg7 f5
+- (#70) Depth: 52/59 00:00:02 17137kN

[Eelco de Groot]

To make it a little bit harder for The Huntsman, here Black seems to have the upper hand. But it is not really something elegant. Maybe it could be repaired into a White win again or something? Now just a computer challenge to show Black winning advantage. Black eventually will promote one of its many pawns. It will take at least depth 24 after the first move 1.Be1 to show Black advantage I think:

[d]7K/4Np1p/3p2pn/B5pr/4n1pb/3N1bk1/4prn1/6RR w - - White to move, Black wins.

Best four moves from The Huntsman:

7K/4Np1p/3p2pn/B5pr/4n1pb/3N1bk1/4prn1/6RR w - -

Engine: The Huntsman 1 (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

28 18:05 -0.69 1.Le1 Pf5 2.Pc6 Th6 3.Pcb4 Pd4 4.Kg7 Pe6+
5.Kxh6 Pef4 6.Pxf2 Pxf2 7.Pc2 Pd5
8.Kxh7 Kf4 9.Ld2+ Kf5 10.Txg2 Pxh1
11.Th2 e1D 12.Lxe1 Lxe1 13.Pxe1 Pg3
14.Kh8 (1.274.075.021) 1174

28 18:05 -2.61 1.Pg8 Tf1 2.Txf1 exf1D 3.Txf1 Pf5
4.Pb4 Pf4 5.Pc6 Kg2 6.Tc1 g3 7.Ld8 g4
8.Lxh4 g5 9.Pge7 Pg6+ 10.Kg8 Pfxe7+
11.Pxe7 Pxe7+ 12.Kf8 Pg6+ 13.Kg7 gxh4
14.Te1 (1.274.075.021) 1174

27 18:05 -2.45 1.Pc1 Tf1 2.Txf1 exf1D 3.Txf1 Pf4
4.Pg8 Pf5 5.Te1 Kh2 6.Txe4 Lxe4
7.Pf6 g3 8.Pxe4 g2 9.Lb6 g4 10.Kg8 Ph6+
11.Kh8 f5 12.Le3 g3 13.Pxg3 Lf6+
14.Kxh7 (1.274.075.021) 1174

27 18:05 -2.50 1.Lb6 e1D 2.Pxe1 Ta2 3.Pc6 Ta8+
4.Pd8 Pf5 5.Pd3 Tc8 6.Tc1 Tb8 7.Tb1 Pge3
8.The1 Kh3 9.Txe3 Pxe3 10.Lxe3 Txd8+
11.Kg7 d5 12.Th1+ Lxh1 13.Lb6 Tb8
14.Lc7 (1.274.075.021) 1174

[peter]

[d]7K/4Np1p/3p2pn/B5pr/4n1pb/3N1bk1/4prn1/6RR w - - White to move, Black wins.

...easily.
Huntsman isn't best engine for positions of disadvantage without mate to be got into search- horizon, but after some Forward- Backward (without NNUE- usage but MateSearch on, which both is default, with NNUE used and MateSearch not, it's a rather normal SF)

7K/4Np1p/3p2pn/B5pr/4n1pb/3N1bk1/4prn1/6RR w - - 0 1

Analysis by The Huntsman 1:

1.Be1 Nf5 2.Nd5 Nd4 3.N5b4 Ne6 4.Kg8 Nf6+ 5.Kxf7 Be4 6.Bxf2+ Kf3 7.Bb6 Bxd3 8.Nxd3 Ngf4 9.Ra1 N6d5 10.Ba7 g3 11.Ne1+ Ke4 12.Ra4+ Kf5 13.Ra5 Ke5 14.Be3 g2 15.Rg1 g4 16.Bxf4+ Nexf4 17.Rxd5+ Kxd5 18.Kg8 Re5 19.Nc2 Re8+ 20.Kf7
-+ (-1.96 ++) Depth: 31/49 00:02:29 5211MN

SF dev. also with already prefilled hash:

7K/4Np1p/3p2pn/B5pr/4n1pb/3N1bk1/4prn1/6RR w - - 0 1

Analysis by Stockfish dev-20231008-7a4de961:

1.Be1 Nf5 2.Nd5 Nd4 3.Nf6 Nc2 4.Nxe4+ Bxe4 5.Nxf2 Bd5 6.Nd3+ Kf3 7.Bc3 Nf4 8.Rc1 Nxd3 9.Rxc2 g3 10.Bd4 Nf4 11.Ra1 g2 12.Rcc1 Bg3 13.Bg1 Kg4 14.Kg7 f5 15.Kf8 Rh1 16.Ke7 h5 17.Kxd6 h4 18.Rab1 h3 19.Ke7 h2 20.Kf8 hxg1B 21.Rxg1 Ne6+ 22.Kf7 Rh7+ 23.Kf6
-+ (-12.46) Depth: 36/63 00:04:47 4733MN, tb=58940