Bluefish v13

[fishpov]

b5 !
[d]8/p6p/4P2p/p3K1pP/pPk5/p2r2p1/P5R1/8 w - - 0 1

Bluefish v13 is the first engine to find, in short time, this position !
I think if the fortress detection will be implemented again for bluefish it should be the champion for Hard-Talkchess-2020
Analysis by Bluefish v13:

.....
1.bxa5 Re3+ 2.Kd6 Rd3+ 3.Kc7 Re3 4.Kd7 Rd3+ 5.Ke8 Re3 6.e7 a6 7.Kd8 Rd3+ 8.Kc7 Re3
= (0.00) Depth: 28/25 00:00:04 13011kN
1.b5 Re3+ 2.Kd6 Rd3+ 3.Kc7 Re3 4.Kd7 Rd3+ 5.Ke8 Re3 6.e7 Rf3 7.Kd7 Rd3+ 8.Ke6 Re3+ 9.Kf7 Rf3+ 10.Ke8 Re3 11.Rg1 Re2 12.Rxg3 Rxa2 13.Re3 Rd2 14.Re4+ Kb3 15.Kf8 a2 16.e8Q a1Q 17.Qf7+ Kc2
+/= (0.32) Depth: 29/39 00:00:05 27157kN
.......
1.b5 Re3+ 2.Kd6 Rd3+ 3.Kc6 Re3 4.Kd7 Rd3+ 5.Ke8 Rb3 6.e7 Re3 7.Rg1 g4 8.Rg2 Rf3 9.Kd7 Rd3+ 10.Kc6 Re3 11.Kd6 Rd3+ 12.Ke5 Re3+ 13.Kf6 Rf3+ 14.Ke6 Re3+ 15.Kf7 Rf3+ 16.Ke8 Re3 17.Rg1 g2 18.Rxg2 g3 19.Rg1 Rd3 20.Kf7 Rf3+ 21.Ke6 Re3+ 22.Kd7 Rd3+ 23.Ke8 Re3 24.Rc1+ Kd3 25.Kd7 Kd2 26.Rf1 Rd3+ 27.Ke6 Re3+ 28.Kf7 Ke2 29.Rf4 Re5 30.e8Q Rxe8 31.Kxe8 Ke3 32.Rg4 Kf2 33.Kf8 Kf3 34.Rg7 g2 35.Kf7
+/- (1.45) Depth: 42/85 00:03:03 2958MN
1.b5 Re3+ 2.Kd6 Rd3+ 3.Kc6 Re3 4.Kd7 Rd3+ 5.Ke8 Rb3 6.e7 Re3 7.Rg1 g4 8.Rg2 Rf3 9.Kd7 Rd3+ 10.Kc6 Re3 11.Kd6 Rd3+ 12.Ke5 Re3+ 13.Kf6 Rf3+ 14.Ke6 Re3+ 15.Kf7 Rf3+ 16.Ke8 Re3 17.Rg1 g2 18.Rxg2 g3 19.Rg1 Rd3 20.Kf7 Rf3+ 21.Ke6 Re3+ 22.Kd7 Rd3+ 23.Ke8 Re3 24.Rc1+ Kd3 25.Kd7 Kd2 26.Rf1 Rd3+ 27.Ke6 Re3+ 28.Kf7 Ke2 29.Rf4 Re5 30.e8Q Rxe8 31.Kxe8 Ke3 32.Rg4 Kf2 33.Kf8 Kf3 34.Rg7 g2 35.Kf7
+- (1.88 ++) Depth: 42/85 00:03:22 3299MN

(, 24.02.2021)

[fishpov]

f3 !
[d]q1N5/b1pB4/1pP5/pP2k1p1/P1P5/6P1/1K3P2/8 w - - 0 1

Only Bluefish can find this (I think)
I didn't try yet Deep Pro Analysis and Pro Analysis what is this ?
Analysis by Bluefish v13:

.....
10.Kc3 Ke4 11.Bg4 Bb8 12.Kd2 Kd4 13.Be6 Ke5 14.Bd7 Kf6 15.Ke3 Kg7 16.f3 Kf7 17.Kd4 Kf6 18.Kd5 Ba7 19.Bg4 Bb8 20.Ke4 Ba7 21.f4 gxf4 22.gxf4 Bb8 23.Bd7 Ba7 24.Kd4 Bb8 25.Ke3 Kg7 26.Ke4 Kf6 27.Kd4 Ba7 28.f5 Bb8 29.Kd5 Ba7 30.Ke4 Bb8 31.Be6 Ba7 32.Kf4 Bb8 33.Kg4 Ba7 34.Kh5 Bb8 35.Kh6 Ba7 36.Kh7
= (0.23) Depth: 46/67 00:06:50 7822MN
10.f3
+/= (0.48 ++) Depth: 46/67 00:06:56 7926MN
10.f3 Qb8 11.Kc3 Qa8 12.Kd3 Bb8 13.Ke3 Ba7 14.f4+ gxf4+ 15.gxf4+ Kf6 16.Kd3 Kf7 17.Kd4 Kf6 18.Kd5 Qb8 19.f5 Qa8 20.Ke4 Qb8 21.Be6 Qa8 22.Kf4 Qb8 23.Kg4 Qa8 24.Kh5 Qb8 25.Kh4 Qa8 26.Kg4 Bb8 27.Bd7 Ba7 28.Kh5 Bb8 29.Kh6 Ba7 30.Kh7 Kf7 31.Be6+ Kf6 32.Kg8 Bb8 33.Kf8 Ba7 34.Ke8 Bb8 35.Kd8 Ke5 36.Ke7 Ke4 37.Kf7 Kd4
+/= (0.59) Depth: 46/67 00:07:43 8888MN
........
10.f3 Qb8 11.Kc3 Kf6 12.f4 Kg6 13.f5+ Kf6 14.Kd4 Qa8 15.Ke4 Qb8 16.Kf3 Kf7 17.Be6+ Kf6 18.Kg4 Qa8 19.Bd7 Bb8 20.Kh5 Ba7 21.Kh6 Bb8 22.Be6 Ba7 23.g4 Bb8 24.Kh7 Ba7 25.Kg8 Bb8 26.Bd7 Ba7 27.Kf8 Bb8 28.Ke8 Ba7 29.Be6 Qb8 30.Kd8 Qa8 31.Kxc7 Bb8+ 32.Kd7 Be5 33.c7 Bxc7 34.Kxc7 Qe4 35.Nxb6 Qe5+ 36.Kd7 Qd4+ 37.Nd5+ Ke5 38.f6
+- (2.40) Depth: 49/39 00:44:50 55176MN

[kasinp]

I was skeptical at first and wanted to give Crystal a try. Indeed, it doesn't seem to be able to solve this (30 min. on 14 cores).
Even then it only sees the solution after I enter some 12 moves and backtrack.

Thanks for posting, a really tough nut to crack.
Peter