Yet another artificial endgame puzzle …

[chrisw]

Solution?
[d] 6k1/1p3p1p/1Pb1pPpP/1pPpP1P1/1P1P4/8/3b1K2/2B2Q2 w - - 0 1

[Jouni]

All 18 possible moves draw.

[chrisw]

All 18 possible moves draw.

says the chess engine

[Jouni]

My own result. Engines think different like Lc0

Analysis by Lc0 v0.31.0:

1.Bxd2 Kf8 2.Qb1 Ke8 3.Qa1 Kd7 4.Bf4 Ke8 5.Qa8+ Kd7
+- (15.76) Depth: 7/13 00:00:37 41kN
1.Bb2 Be1+ 2.Qxe1 Kf8 3.Qa1 Ke8 4.Qa7 Kf8 5.Qb8+ Be8 6.c6
+- (38.33) Depth: 7/13 00:00:42 47kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.47) Depth: 7/14 00:00:45 51kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.28) Depth: 7/14 00:00:50 58kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.21) Depth: 7/14 00:00:55 64kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.12) Depth: 7/14 00:01:00 71kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.32) Depth: 7/14 00:01:05 78kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Qa8+ Kd7 7.Qf8
+- (40.34) Depth: 7/14 00:01:10 85kN

[F. Bluemers]

my guess,to win white has to go to the 8th rank without stalemating black ,so he should not take the bishop.
So maybe Bb2 or Qe2

[towforce]

my guess,to win white has to go to the 8th rank without stalemating black ,so he should not take the bishop.
So maybe Bb2 or Qe2

+1

[cc2150dx]

My own result. Engines think different like Lc0

Analysis by Lc0 v0.31.0:

1.Bxd2 Kf8 2.Qb1 Ke8 3.Qa1 Kd7 4.Bf4 Ke8 5.Qa8+ Kd7
+- (15.76) Depth: 7/13 00:00:37 41kN
1.Bb2 Be1+ 2.Qxe1 Kf8 3.Qa1 Ke8 4.Qa7 Kf8 5.Qb8+ Be8 6.c6
+- (38.33) Depth: 7/13 00:00:42 47kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.47) Depth: 7/14 00:00:45 51kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.28) Depth: 7/14 00:00:50 58kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.21) Depth: 7/14 00:00:55 64kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.12) Depth: 7/14 00:01:00 71kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Bc1 Kd8
+- (39.32) Depth: 7/14 00:01:05 78kN
1.Bb2 Be1+ 2.Kxe1 Kf8 3.Kd2 Ke8 4.Qa1 Kd7 5.Qa7 Kc8 6.Qa8+ Kd7 7.Qf8
+- (40.34) Depth: 7/14 00:01:10 85kN

Is there something wrong with your binary or net...cause ...Qf8 is stalemate ?

Here's my analysis after 1 mil nodes....nothing.

FEN: 6k1/1p3p1p/1Pb1pPpP/1pPpP1P1/1P1P4/8/3b1K2/2B2Q2 w - - 0 1

Lc0:

12/36 04:25 1,046k 3k +4.08 1.Bb2 Be3+ 2.Ke2 Bc1 3.Bc3 Kf8 4.Be1 Ke8 5.Kd1 Bd2 6.Bh4 Kf8 7.Qd3 Bc3 8.Qb1 Bb2 9.Qa2 Ba3 10.Qxa3

[Ajedrecista]

Hello:

All the pieces except the white king and the black dark square bishop are placed in the same way that this cooked problem from 1968:

https://yacpdb.org/#399745

Are there more ideas based on that problem?

Regards from Spain.

Ajedrecista.

[F. Bluemers]

1. Qe2 Kf8
1. Bb2 Bc1
both seem to equalize

[peter]

All the pieces except the white king and the black dark square bishop are placed in the same way that this cooked problem from 1968:

https://yacpdb.org/#399745

Are there more ideas based on that problem?

HHdbVI finds to given position this one at move nr. 3.:

[pgn][Event "Ceskoslovensky Sach#24"]
[Site "?"]
[Date "1937.??.??"]
[Round "?"]
[White "Hasek=J"]
[Black "(+1070.88f2h8) (m)"]
[Result "1-0"]
[SetUp "1"]
[FEN "7k/1p3p1p/1Pb1pPpP/1pPpP1P1/1P1P4/8/2pb1K2/B4Q2 w - - 0 1"]
[PlyCount "23"]
[EventDate "1937.??.??"]

{Ceskoslovensky Sach=4-5 Ceskoslovensky Sach/4-5 (EG#22873). modification: Polasek=J sp.c Ceskoslovensky Sach 2018 7/2018.} 1. Bb2 c1=Q $1 2. Bxc1 Kg8 3. Ba3 $1 (3. Bxd2 $2 Kf8 4. Qa1 Ke8 5. Qa8+ Kd7 6. Qg8) 3... Bc1 $1 (3... Kf8 4. Qa1 Bc1 5. Bb2 $1) (3... Bc3 4. Ke3 $1 (4. Qd1 $2 Kf8 5. Qb3 Bb2 6. Qa4 Bxd4+) 4... Bb2 5. Qd3) 4. Qd3 $1 Bb2 (4... Kf8 5. Qxb5 $1 Bxb5 6. c6 Bxc6 7. b5+) 5. Ke3 $1 Bc1+ (5... Ba1 6. Qb3 Bb2 7. Kf3 $1 Kf8 8. Qa4 bxa4 9. b5 Bxd4 10. bxc6) (5... Bc3 6. Qc2 $1 Bb2 7. Qb3 $1) 6. Kf3 Bb2 7. Qb3 $1 Kf8 (7... Bc1 8. Qa2 Kf8 9. Bb2 $1) 8. Qa4 $1 bxa4 9. b5 Bxd4 10. bxc6 bxc6 11. Bc1 (11. Kf4 $2 Bg1 12. Bc1 Bxc5 13. Ba3 $1) 11... Bxc5 (11... Bxe5 12. Bf4) 12. Ba3 $1 1-0[/pgn]
Edit: didn't have my hardware available before, but here's now Backward with Huntsman at position of first posting, starting with move nr.3 (instead of 1) as it's counted in orginal study:

[d]6k1/1p3p1p/1Pb1pPpP/1pPpP1P1/1P1P4/8/3b1K2/2B2Q2 w - - 0 1

Analysis by The Huntsman 1:

3.La3 Lc3 4.Ke3 Lb2 5.Dd3 Lc3 6.Dc2 Lb2 7.Db3 Lc1+ 8.Kf2 Kf8 9.Da4 Le3+ 10.Kf3 bxa4 11.b5 Lxd4 12.bxc6 bxc6 13.Lc1 Lxc5 14.La3 Ke8 15.Lxc5 Kd8 16.Ke2 Kc8 17.Kd2 Kb7 18.Kc3 a3 19.Kb3 a2 20.Kxa2 Kc8 21.Ka3 Kb8 22.Ld4 Kb7 23.Kb4 Kb8 24.Kc5 Kb7 25.La1 d4 26.Lxd4 Ka6 27.La1 Kb7 28.Lb2 Kc8 29.Kxc6 Kb8 30.La3 Ka8 31.b7+ Kb8 32.Ld6+ Ka7 33.b8D+ Ka6 34.Db6#
Tiefe: 84/64 00:00:33 1699MN
Weiß setzt Matt.
+- (#32)

And at original move nr.1 of Hasek- study:

[d]7k/1p3p1p/1Pb1pPpP/1pPpP1P1/1P1P4/8/2pb1K2/B4Q2 w - - 0 1

Analysis by The Huntsman 1:

1.Lb2 c1L 2.Lxc1 Kg8 3.La3 Lc3 4.Ke3 Lb2 5.Dd3 Lc3 6.Dc2 Lb2 7.Db3 Lc1+ 8.Kf2 Kf8 9.Da4 Le3+ 10.Kf3 bxa4 11.b5 Lxd4 12.bxc6 bxc6 13.Lc1 Lxc5 14.La3 Ke8 15.Lxc5 Kd7 16.Ke2 Kc8 17.Kd3 Kb7 18.Kc3 a3 19.Kb3 a2 20.Kxa2 Kc8 21.Kb3 Kb8 22.Kb4 Kb7 23.Lf2 Kc8 24.Kc5 Kb7 25.Ld4 Ka6 26.Kxc6 Ka5 27.Kc5 Ka4 28.b7 Kb3 29.b8D+ Kc2 30.Db4 Kd3 31.De1 Kc2 32.De2+ Kc1 33.Kc6 Kb1 34.Db2#
Tiefe: 94/68 00:00:34 1676MN
Weiß setzt Matt.
+- (#34)