Did put it in these words not being sure 4...Ne7+ to be the shortest way to win even, neither as for the moves from starting position.peter wrote:At least the "solution variant" isn't correct, after 4...Ne7+ instead of ...Bc8? White with 5.Nxe7 is mate in 52, with everything else faster
But after Backward of one of the won 7somes we get such output from komodo with full Syzygys:
[d]6nn/2N5/B5b1/1K6/7b/6N1/8/3k4 w - - 0 1
Analysis by Komodo 9.42 64-bit:
1.Nh1 Be4 2.Kb6 Bxh1 3.Nb5 Nf7 4.Bc8 Nf6 5.Be6 Bf2+ 6.Kc7 Ne8+ 7.Kb8 Ne5 8.Nc3+ Kc2 9.Na4 Bc6 10.Bf5+ Kd2 11.Nb2 Nd6 12.Be6 Bb6 13.Nc4+ Ndxc4 14.Kc8 Nd7 15.Bxc4
-+ (-250.00) Depth: 42 00:00:17 534MN, tb=16507420
and after 1.Nf1:
6nn/2N5/B5b1/1K6/7b/8/8/3k1N2 b - - 0 1
Analysis by Komodo 9.42 64-bit:
1...Bd3+ 2.Kb4 Be1+ 3.Kb3 Bxa6 4.Ne3+ Kd2 5.Nf5 Bc8 6.Nd4 Bg3 7.Ncb5 Kd3 8.Nf3 Nf7 9.Kb2 Bg4 10.Ng1 Bf2 11.Na3 Bxg1 12.Nc2 Nh8 13.Kb1 Bc5 14.Kb2 Kd2 15.Ka1 Kxc2
-+ (-250.00) Depth: 45 00:00:05 174MN, tb=3023237
Seems to be cooked, because even if 50 moves wouldn't be enough to reach 6some after 7some, (but I'd be rather sure they would, having seen the one Lomonosov- line after 4...Nxe7), that wouldn't matter as for a study.
Studies don't take 50 moves rule into acount