Nice testposition from Eigenmann

[peter]

Have to investigate some further,

Some doubt again:

7k/p1pp2p1/1p1p3p/8/2P5/q1PPB3/7R/5RK1 w - - 0 1

1. Bd4 c5 2. Rxh6+ Kg8 3. Bxg7 Kxg7 4. Rh2 Qxc3 5. Rg2+ Kh8 6. Rf3 Qe1+ 7. Kh2
Qe5+ 8. Rfg3 Qf4 9. Re2 Qf1 10. Re4 Qf2+ 11. Rg2 Qf6 12. Kg3 Qg5+ 13. Kf3 Qh6
14. Rg3 Qh1+ 15. Kf2 Kh7 16. Reg4 Qh2+ 17. Rg2 Qh6 18. Rg5 Qh4+ 19. R2g3 Qh2+
20. Ke3 Qh6 21. Kf4 Qh2 22. Kf5 Qf2+ 23. Kg4 Qe2+ 24. Kh4 Qh2+ 25. Rh3 Qf4+ 26.
Kh5 a5 27. Rhg3 Qf6 28. Kg4 Qe6+ 29. Kf3 Kh6 30. Rg8 Qf6+ 31. Kg2 Qb2+ 32. Kh1
Qa1+ 33. Rg1 Qe5 34. R8g2 b5 35. Rh2+ Qxh2+ 36. Kxh2 b4 37. Ra1 Kg5 38. Kg3 a4
39. Rxa4 Kf5 40. Kf3 Ke5 41. Ra6 d5 42. Ke3 dxc4 43. dxc4 b3 44. Rb6 d6 45.
Rxb3 d5 46. Kd3 Kd6 47. cxd5 Kxd5 48. Rb5 Kc6 49. Kc4 Kd6 50. Rxc5 Ke6 51. Kd4
Kd6 52. Re5 Kc6 53. Kc4 Kd6 54. Re4 Kc7 55. Kc5 Kd7 56. Re2 Kc7 57. Re7+ Kd8
58. Kd6 Kc8 59. Kc6 Kb8 60. Re8+ Ka7 61. Rc8 Ka6 62. Ra8#

DTM can be kept in hash backward to first 20, 25 ones, maybe some blunders before that?

[Hobacle]

Have to investigate some further,

Some doubt again:

7k/p1pp2p1/1p1p3p/8/2P5/q1PPB3/7R/5RK1 w - - 0 1

1. Bd4 c5 2. Rxh6+ Kg8 3. Bxg7 Kxg7 4. Rh2 Qxc3 5. Rg2+ Kh8 6. Rf3 Qe1+ 7. Kh2
Qe5+ 8. Rfg3 Qf4 9. Re2 Qf1 10. Re4 Qf2+ 11. Rg2 Qf6 12. Kg3 Qg5+ 13. Kf3 Qh6
14. Rg3 Qh1+ 15. Kf2 Kh7 16. Reg4 Qh2+ 17. Rg2 Qh6 18. Rg5 Qh4+ 19. R2g3 Qh2+
20. Ke3 Qh6 21. Kf4 Qh2 22. Kf5 Qf2+ 23. Kg4 Qe2+ 24. Kh4 Qh2+ 25. Rh3 Qf4+ 26.
Kh5 a5 27. Rhg3 Qf6 28. Kg4 Qe6+ 29. Kf3 Kh6 30. Rg8 Qf6+ 31. Kg2 Qb2+ 32. Kh1
Qa1+ 33. Rg1 Qe5 34. R8g2 b5 35. Rh2+ Qxh2+ 36. Kxh2 b4 37. Ra1 Kg5 38. Kg3 a4
39. Rxa4 Kf5 40. Kf3 Ke5 41. Ra6 d5 42. Ke3 dxc4 43. dxc4 b3 44. Rb6 d6 45.
Rxb3 d5 46. Kd3 Kd6 47. cxd5 Kxd5 48. Rb5 Kc6 49. Kc4 Kd6 50. Rxc5 Ke6 51. Kd4
Kd6 52. Re5 Kc6 53. Kc4 Kd6 54. Re4 Kc7 55. Kc5 Kd7 56. Re2 Kc7 57. Re7+ Kd8
58. Kd6 Kc8 59. Kc6 Kb8 60. Re8+ Ka7 61. Rc8 Ka6 62. Ra8#

DTM can be kept in hash backward to first 20, 25 ones, maybe some blunders before that?

Putting the bishop at e3 was my adventurous decision indeed. We can easily avoid 1.Bd4 by putting it at f4. But if 1.Bd4 c5 2.Rxh6+ Kg8 3.Bxg7 Kxg7 4.Rh2 draws while 1.Bxh6 gxh6 2.Rxh6+ Kg7 3.Rh2 wins, it will be something quite cool!

[peter]

Putting the bishop at e3 was my adventurous decision indeed. We can easily avoid 1.Bd4 by putting it at f4. But if 1.Bd4 c5 2.Rxh6+ Kg8 3.Bxg7 Kxg7 4.Rh2 draws while 1.Bxh6 gxh6 2.Rxh6+ Kg7 3.Rh2 wins, it will be something quite cool!

I'm stil not sure, if 1.Bd4 really wins at all, made the line with SlowChess because of it's fine specialised mate search, can't reproduce it with SF further backward then to 15th move neither anyhow. There (15)...Qh2+ instead of 15...Kh7 and 0.00 again. Point seems to be if or if not Black can reach perpetual checks.

That all tends to get some hardware- time- consuming and or expensive as for time spent infront of PC as well, pity I won't find that (time) just now, will be back some later on regards

Edit: instead of 14.Rg3(?) 14.Reg4 and 1-0 again

7k/p2p4/1p1p3q/2p5/2P3R1/3P1K2/6R1/8 b - - 0 1

Analysis by Stockfish 11 64 POPCNT30:

14...Kh7 15.R2g3 Qh1+ 16.Kf2 Qh2+ 17.Rg2 Qh6 18.Rg5 Qh4+ 19.R2g3 Qh2+ 20.Ke3 Qh6 21.Kf4 Qh2 22.Kf5 Qf2+ 23.Kg4 Qe2+ 24.Kh4 Qh2+ 25.Rh3 Qf4+ 26.Kh5 b5 27.Rhg3 Qf6 28.Kg4 Qe6+ 29.Kf3 Qf6+ 30.Kg2 Kh6 31.Rg8 Qb2+ 32.Kh1 Qa1+ 33.Rg1 Qe5 34.R8g6+ Kh5 35.Rg7 Kh6 36.R1g6+ Kh5 37.Rg2 Kh6 38.R7g3 Qe1+ 39.Rg1 Qxg3 40.Rxg3 b4 41.Kg2 b3 42.Kf3 Kh5 43.Rg1 a5 44.Rb1 a4 45.Ke3 Kg6 46.Kd2 Kf5 47.Kc3 Kf4 48.Rf1+ Kg3 49.Rf7 Kh3 50.Rxd7 Kh2 51.Rb7
+- (8.06) Depth: 30/78 00:00:18 1761MN

So we are done with 1.Bd4, that's major dual too, sorry:

7k/p1pp2p1/1p1p3p/8/2PB4/q1PP4/7R/5RK1 b - - 0 1

Analysis by Stockfish 11 64 POPCNT30:

1...c5 2.Rxh6+ Kg8 3.Bxg7 Kxg7 4.Rh2 Qxc3 5.Rg2+ Kh7 6.Rf7+ Kh8 7.Rf3 Qa1+ 8.Kh2 Qe5+ 9.Rfg3 Qf4 10.Re2 Qf1 11.Re4 Qf2+ 12.Rg2 Qf6 13.Kg3 Qg5+ 14.Kf3 Qh5+ 15.Reg4 Qf5+ 16.Ke2 Qe5+ 17.Kf2 Qf6+ 18.Kg1 Qa1+ 19.Kh2 Qf6 20.Rg5 Qf3 21.R2g3 Qe2+ 22.Kh3 b5 23.Kh4 Qh2+ 24.Rh3 Qf4+ 25.Kh5 b4 26.Rhg3 Qf6 27.Kg4 Qe6+ 28.Kf3 Qh6 29.Kg2 a5 30.Rh3 Qxh3+ 31.Kxh3 a4 32.Rg1 a3 33.Ra1 Kg7 34.Kg3 Kg6 35.Kg4 Kf6 36.Kf4 Ke6 37.d4 Kf6 38.Ke4 Ke6 39.Re1 Kf6 40.Kd3 Kf5 41.Kc2 Kg5 42.dxc5 dxc5 43.Rf1 d6 44.Kb3 a2 45.Kxa2 Kg4 46.Rd1 Kf3 47.Rxd6 Ke3 48.Rd7
+- (9.09) Depth: 51/110 00:02:08 10430MN

Let's go for B at f4, but for now I'll have to have a break

[Hobacle]

So we are done with 1.Bd4, that's major dual too, sorry:

7k/p1pp2p1/1p1p3p/8/2PB4/q1PP4/7R/5RK1 b - - 0 1

Analysis by Stockfish 11 64 POPCNT30:

1...c5 2.Rxh6+ Kg8 3.Bxg7 Kxg7 4.Rh2 Qxc3 5.Rg2+ Kh7 6.Rf7+ Kh8 7.Rf3 Qa1+ 8.Kh2 Qe5+ 9.Rfg3 Qf4 10.Re2 Qf1 11.Re4 Qf2+ 12.Rg2 Qf6 13.Kg3 Qg5+ 14.Kf3 Qh5+ 15.Reg4 Qf5+ 16.Ke2 Qe5+ 17.Kf2 Qf6+ 18.Kg1 Qa1+ 19.Kh2 Qf6 20.Rg5 Qf3 21.R2g3 Qe2+ 22.Kh3 b5 23.Kh4 Qh2+ 24.Rh3 Qf4+ 25.Kh5 b4 26.Rhg3 Qf6 27.Kg4 Qe6+ 28.Kf3 Qh6 29.Kg2 a5 30.Rh3 Qxh3+ 31.Kxh3 a4 32.Rg1 a3 33.Ra1 Kg7 34.Kg3 Kg6 35.Kg4 Kf6 36.Kf4 Ke6 37.d4 Kf6 38.Ke4 Ke6 39.Re1 Kf6 40.Kd3 Kf5 41.Kc2 Kg5 42.dxc5 dxc5 43.Rf1 d6 44.Kb3 a2 45.Kxa2 Kg4 46.Rd1 Kf3 47.Rxd6 Ke3 48.Rd7
+- (9.09) Depth: 51/110 00:02:08 10430MN

Let's go for B at f4, but now I'll have to have a break

Sadly...

[fen]7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1[/fen]

However, by changing the place of the h rook, we can get many more positions. I'll try to work them out and find the best position...

[Vinvin]

3 best moves : Bc1 and Bxh6 are clearly wining, even Rh3 get a high score but I'm not sure it's clearly winning.

Code: Select all

FEN: 7k/p1p3p1/1p1p3p/6B1/2P5/q1PP4/7R/5RK1 w - - 0 1

Stockfish_22021301_x64_avx2:
...
 50/92	06:36	 11.668.348k	29.399k	+2,73	1.Rh3 Kg8 2.Be7 Qxc3 3.Bf8 Qe5 4.Rff3 Qe1+ 5.Kg2 Qe2+ 6.Rf2 Qe6 7.Rg3 g5 8.Rgf3 Qg4+ 9.Kf1 Qh5 10.Ke1 b5 11.cxb5 Qe8+ 12.Kf1 Qh5 13.Be7 Kh7 14.Bf6 Qe8 15.Rc2 Qxb5 16.Rxc7+ Kg6 17.Ke2 Qe8+ 18.Kd2 Qa4 19.Bc3 Kh5 20.Rf6 Qa2+ 21.Ke3 Qh2 22.Re7 Qc2 23.Bd2 Qd1 24.Ree6 Qg1+ 25.Ke2 Qg4+ 26.Kf2 Qh4+ 27.Ke3 Qg3+ 28.Kd4 Qg1+ 29.Be3 Qa1+ 30.Kd5 Qa2+ 31.Kc6 Qa6+ 32.Kd7 Qxd3 33.Rxh6+ Kg4 34.Rhg6 Qb5+ 35.Kxd6 Qb8+ 36.Ke7 Qb7+ 37.Kf8 Qa8+ 38.Kf7 Qf3+ 39.Rgf6 Qd5 40.Kg7 Qd7+ 41.Kh6 Qc8 42.Re4+ Kh3 43.Bxg5 Qh8+ 44.Kg6 Qg8+ 45.Kf5
 50/68	06:36	 11.668.348k	29.399k	+54,31	1.Bc1 Qc5+ 2.d4 Qxc4 3.Bxh6 gxh6 4.Rxh6+ Kg7 5.Rh3 Qe6 6.Rg3+ Kh8 7.Rf8+ Kh7 8.Rf4 Qe1+ 9.Kg2 Qd2+ 10.Rf2 Qe1 11.Rh3+ Kg8 12.Rhf3 Qe4 13.Kh2 Kh8 14.Rh3+ Kg7 15.Rg3+ Kh8 16.Rfg2 Qf4 17.Kh1 Qc1+ 18.Rg1 Qh6+ 19.Kg2 Qd2+ 20.Kf3 Qxc3+ 21.Ke4 Qc2+ 22.Kd5 Qh7 23.Re1 c6+ 24.Kxc6 Qh4 25.Reg1 Qh7 26.d5 a5 27.Kxd6 a4 28.Kc6 a3 29.Rxa3 Qc2+ 30.Kb7 Qf5 31.Ra8+ Kh7 32.Rd8 b5 33.Rc1 Kh6 34.Rc6+ Kg5
 50/57	06:36	 11.668.348k	29.399k	+54,73	1.Bxh6 gxh6 2.Rxh6+ Kg7 3.Rh2 Qxc3 4.Rg2+ Kh7 5.Rf7+ Kh8 6.Rf3 Qe1+ 7.Kh2 Qe5+ 8.Rfg3 Qf4 9.Re2 Qf1 10.Re4 Qf2+ 11.Rg2 Qf6 12.Kg3 Qa1 13.Rg4 Qe5+ 14.Kh3 Qf5 15.Kh2 Qf6 16.Rg5 Qf3 17.R2g4 Qe2+ 18.Kh3 Qe3+ 19.Rg3 Qe2 20.Kh4 Qh2+ 21.Kg4 Qe2+ 22.Kf4 Qf1+ 23.Ke4 Qh1+ 24.Kf5 Qh6 25.Kg4 Qe6+ 26.Kf3 Qh6 27.Kg2 Qh7 28.Rh3 a5 29.Rh1
---------------------------------------------------------------------------
 50/92	09:07	 16.259.744k	29.710k	+2,73	1.Rh3 Kg8 2.Be7 Qxc3 3.Bf8 Qe5 4.Rff3 Qe1+ 5.Kg2 Qe2+ 6.Rf2 Qe6 7.Rg3 g5 8.Rgf3 Qg4+ 9.Kf1 Qh5 10.Ke1 b5 11.cxb5 Qe8+ 12.Kf1 Qh5 13.Be7 Kh7 14.Bf6 Qe8 15.Rc2 Qxb5 16.Rxc7+ Kg6 17.Ke2 Qe8+ 18.Kd2 Qa4 19.Bc3 Kh5 20.Rf6 Qa2+ 21.Ke3 Qh2 22.Re7 Qc2 23.Bd2 Qd1 24.Ree6 Qg1+ 25.Ke2 Qg4+ 26.Kf2 Qh4+ 27.Ke3 Qg3+ 28.Kd4 Qg1+ 29.Be3 Qa1+ 30.Kd5 Qa2+ 31.Kc6 Qa6+ 32.Kd7 Qxd3 33.Rxh6+ Kg4 34.Rhg6 Qb5+ 35.Kxd6 Qb8+ 36.Ke7 Qb7+ 37.Kf8 Qa8+ 38.Kf7 Qf3+ 39.Rgf6 Qd5 40.Kg7 Qd7+ 41.Kh6 Qc8 42.Re4+ Kh3 43.Bxg5 Qh8+ 44.Kg6 Qg8+ 45.Kf5
 50/68	09:07	 16.259.744k	29.710k	+54,31	1.Bc1 Qc5+ 2.d4 Qxc4 3.Bxh6 gxh6 4.Rxh6+ Kg7 5.Rh3 Qe6 6.Rg3+ Kh8 7.Rf8+ Kh7 8.Rf4 Qe1+ 9.Kg2 Qd2+ 10.Rf2 Qe1 11.Rh3+ Kg8 12.Rhf3 Qe4 13.Kh2 Kh8 14.Rh3+ Kg7 15.Rg3+ Kh8 16.Rfg2 Qf4 17.Kh1 Qc1+ 18.Rg1 Qh6+ 19.Kg2 Qd2+ 20.Kf3 Qxc3+ 21.Ke4 Qc2+ 22.Kd5 Qh7 23.Re1 c6+ 24.Kxc6 Qh4 25.Reg1 Qh7 26.d5 a5 27.Kxd6 a4 28.Kc6 a3 29.Rxa3 Qc2+ 30.Kb7 Qf5 31.Ra8+ Kh7 32.Rd8 b5 33.Rc1 Kh6 34.Rc6+ Kg5
 51/100	09:07	 16.259.744k	29.710k	+54,73	1.Bxh6 gxh6 2.Rxh6+ Kg8 3.Rh2 Qxc3 4.Rg2+ Kh7 5.Rf7+ Kh8 6.Rf3 Qe1+ 7.Kh2 Qe5+ 8.Rfg3 Qf4 9.Re2 Qf1 10.Re4 Qf2+ 11.Rg2 Qf6 12.Kg3 Qa1 13.Rg4 Qe5+ 14.Kh3 Qf5 15.Kh2 Qf6 16.Rg5 Qf3 17.R2g4 Qf2+ 18.Kh3 Qf3+ 19.Rg3 Qe2 20.Kh4 Qh2+ 21.Kg4 Qe2+ 22.Kf4 Qf1+ 23.Ke4 Qh1+ 24.Kf5 Qh6 25.Kg4 Qe6+ 26.Kf3 Qh6 27.Kg2 Qh7 28.Rh3 a5 29.Rxh7+ Kxh7 30.d4

[Vinvin]

3 best moves : Bc1 and Bxh6 are clearly wining, even Rh3 get a high score but I'm not sure it's clearly winning.

Analyse after 1.Rh3. Close to +4.5 now

Code: Select all

FEN: 7k/p1p3p1/1p1p3p/6B1/2P5/q1PP3R/8/5RK1 b - - 1 1

Stockfish_22021301_x64_avx2:
NNUE evaluation using nn-6877cd24400e.nnue enabled
...
 56/91-	14:51	 27.373.424k	30.716k	+3,98	1. ... b5
 56/91	15:05	 27.802.595k	30.705k	+3,98	1. ... b5 2.cxb5 Kh7 3.c4 d5 4.cxd5 Qb3 5.Bh4 Qxb5 6.Rc1 Qxd5 7.Re3 Qd6 8.Rc4 Qb6 9.Bf2 a5 10.Rg3 Qd6 11.Be1 h5 12.Re4 c6 13.Bf2 Kg8 14.Re8+ Kh7 15.Ra8 h4 16.Rg4 Qxd3 17.Rxh4+ Kg6 18.Rxa5 c5 19.Rg4+ Kh7 20.Ra1 Qd5 21.Rg3 Kg8 22.Rc1 Qd6 23.Rxc5 Qd8 24.Rcg5 Qf6 25.R5g4 Qa1+ 26.Kg2 Qb2 27.Rc4 Qd2 28.Rc8+ Kf7 29.Rf3+ Kg6 30.Rcf8 Qc2 31.Rg3+ Kh7 32.Rh3+ Kg6 33.Rf4 Qc6+ 34.Rhf3 Qc2 35.Rg3+ Kh7 36.Rh4+ Kg8
 57/93+	17:17	 31.679.011k	30.548k	+4,27	1. ... b5 2.cxb5
 57/93+	24:57	 45.454.197k	30.348k	+4,54	1. ... b5 2.cxb5
 57/93	25:50	 46.996.465k	30.319k	+4,57	1. ... b5 2.cxb5 Qxc3 3.Rxh6+ Kg8 4.Rh3 Qc5+ 5.Be3 Qxb5 6.Bf4 a5 7.Rg3 Qh5 8.Rff3 a4 9.Bg5 a3 10.Bf6 Kf7 11.Bb2+ Ke6 12.Bxa3 Qb5 13.Bc1 Qb4 14.Bf4 Qb2 15.Rf1 Qd4+ 16.Rf2 Qa1+ 17.Kg2 Qd4 18.Re2+ Kd7 19.Bd2 Qb2 20.Rf2 Qd4 21.Be1 Qd5+ 22.Rff3 g5 23.Kg1 Qd4+ 24.Bf2 Qg7 25.Re3 Qg6 26.Kg2 Qg7 27.Re4 Qg8 28.Rf3 Qa2 29.Rfe3 Qf7 30.Kg3 Qd5 31.Re7+ Kc6 32.Rf3 Qb5 33.d4 Qc4 34.Rg7 Qc1 35.Rf5 Qd2 36.Rgxg5 Qd3+ 37.Kh2 Qe4 38.Kg1 Qe7 39.Rg3

[peter]

Sadly...

[fen]7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1[/fen]

However, by changing the place of the h rook, we can get many more positions. I'll try to work them out and find the best position...

Why not stick to this one and why "sadly"?

Anyhow, I think it's ok now.

After some Backward of lines after moves that were won or dubious before:

7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1

Analysis by Crystal 251221:

Code: Select all

1. +-  (7.55): 1.Bxh6 gxh6 2.Rxh6+ Kg7 3.Rh2 Qxc3 4.Rg2+ Kh7 5.Rf7+ Kh8 6.Rf3 Qa1+ 7.Kh2 Qe5+ 8.Rfg3 Qf4 9.Re2 Qf1 10.Re4 Qf2+ 11.Rg2 Qf6 12.Kg3 Qg6+ 13.Kf3 Qf7+ 14.Ke2 Qh5+ 15.Reg4 Qe5+ 16.Kf2 Qf6+ 17.Kg1 Qa1+ 18.Kh2 Qf6 19.Rg5 Qf3 20.R2g3 Qe2+ 21.Kh3 Kh7 22.Kh4 Kh6 23.Rg6+ Kh7 24.Rg7+ Kh8 25.R7g5 Qh2+ 26.Rh3 Qf4+ 27.Kh5 Kh7 28.Rhg3 Qf6 29.Kg4 Qe6+ 30.Kf3 Kh6 31.Rg8 Qf6+ 32.Kg2 Qb2+ 33.Kh1 Qb1+ 34.Rg1 Qxd3 35.Rh8+ Qh7 36.Rxh7+ Kxh7 37.Kh2 a6 38.Kh3 c6 39.Rd1 Kg7 40.Rxd6 Kf7 41.Rxd7+ Ke8 42.Rd6 

2. =  (0.00): 1.Rg2 Qxc3 2.Bc1 Qd4+ 3.Rff2 Qa1 4.Rf1 

3. =  (0.00): 1.Bc1 Qc5+ 2.Rhf2 a5 3.Re1 Kh7 4.Be3 Qe5 5.Bd2 Qh5 6.Rg2 Kg8 7.Be3 Qe5 8.Bd2 

4. =  (0.00): 1.Rh3 Qxc3 2.Bxh6 gxh6 3.Rxh6+ Kg8 4.Rg6+ Kh8 

5. =  (0.00): 1.Bd2 a5 2.Re2 Qc5+ 3.Rff2 Qh5 4.Be3 Kh7 5.Rg2 Kg8 6.Bd4 g5 7.Re7 Qd1+ 8.Kh2 Qh5+ 

6. =  (0.00): 1.Be3 Qxc3 2.Bxh6 gxh6 3.Rxh6+ Kg8 4.Rg6+ Kh8 

[Hobacle]

[fen]7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1[/fen]

Anyhow, I think it's ok now.

After some Backward of lines after moves that were won or dubious before:

7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1

Analysis by Crystal 251221:

Code: Select all

1. +-  (7.55): 1.Bxh6 gxh6 2.Rxh6+ Kg7 3.Rh2 Qxc3 4.Rg2+ Kh7 5.Rf7+ Kh8 6.Rf3 Qa1+ 7.Kh2 Qe5+ 8.Rfg3 Qf4 9.Re2 Qf1 10.Re4 Qf2+ 11.Rg2 Qf6 12.Kg3 Qg6+ 13.Kf3 Qf7+ 14.Ke2 Qh5+ 15.Reg4 Qe5+ 16.Kf2 Qf6+ 17.Kg1 Qa1+ 18.Kh2 Qf6 19.Rg5 Qf3 20.R2g3 Qe2+ 21.Kh3 Kh7 22.Kh4 Kh6 23.Rg6+ Kh7 24.Rg7+ Kh8 25.R7g5 Qh2+ 26.Rh3 Qf4+ 27.Kh5 Kh7 28.Rhg3 Qf6 29.Kg4 Qe6+ 30.Kf3 Kh6 31.Rg8 Qf6+ 32.Kg2 Qb2+ 33.Kh1 Qb1+ 34.Rg1 Qxd3 35.Rh8+ Qh7 36.Rxh7+ Kxh7 37.Kh2 a6 38.Kh3 c6 39.Rd1 Kg7 40.Rxd6 Kf7 41.Rxd7+ Ke8 42.Rd6 

2. =  (0.00): 1.Rg2 Qxc3 2.Bc1 Qd4+ 3.Rff2 Qa1 4.Rf1 

3. =  (0.00): 1.Bc1 Qc5+ 2.Rhf2 a5 3.Re1 Kh7 4.Be3 Qe5 5.Bd2 Qh5 6.Rg2 Kg8 7.Be3 Qe5 8.Bd2 

4. =  (0.00): 1.Rh3 Qxc3 2.Bxh6 gxh6 3.Rxh6+ Kg8 4.Rg6+ Kh8 

5. =  (0.00): 1.Bd2 a5 2.Re2 Qc5+ 3.Rff2 Qh5 4.Be3 Kh7 5.Rg2 Kg8 6.Bd4 g5 7.Re7 Qd1+ 8.Kh2 Qh5+ 

6. =  (0.00): 1.Be3 Qxc3 2.Bxh6 gxh6 3.Rxh6+ Kg8 4.Rg6+ Kh8 

I'm considering this one now:
7k/p1pp2p1/1p1p3p/8/2P2B1R/q1PP4/8/5RK1 w - - 0 1

[Vinvin]

Sadly...

[fen]7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1[/fen]

However, by changing the place of the h rook, we can get many more positions. I'll try to work them out and find the best position...

Why not stick to this one and why "sadly"?

Anyhow, I think it's ok now.

After some Backward of lines after moves that were won or dubious before:

7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1

Analysis by Crystal 251221:
...
3. = (0.00): 1.Bc1 Qc5+ 2.Rhf2 a5 3.Re1 Kh7 4.Be3 Qe5 5.Bd2 Qh5 6.Rg2 Kg8 7.Be3 Qe5 8.Bd2

How do you get 0.00 for 1.Bc1 ?

I get +10 with the line :

[White "W"]
[Black "B"]
[Result "*"]
[SetUp "1"]
[FEN "7k/p1p3p1/1p1p3p/6B1/2P5/q1PP4/7R/5RK1 w - - 0 1"]

1. Bc1 Qc5+ 2. d4 Qxc4 3. Bxh6 gxh6 4. Rxh6+ Kg7 5. Rh3 Qe6 6. Rg3+ Kh7 7.
Rf4 Qe1+ 8. Kg2 Qd2+ 9. Rf2 Qe1 10. Rf4 Qd2+ 11. Rf2 Qe1 12. Rh3+ Kg7 13.
Rhf3 Kh8 14. Rh3+ Kg7 15. Rhf3 Kh7 16. Kh2 Qe4 17. Rh3+ Kg8 18. Rg3+ Kh8
19. Rfg2 Qf4 20. Kg1 Qc1+ 21. Kf2 Qd2+ 22. Kf3 Qd3+ 23. Kf4 Qf1+ 24. Ke4
Qb1+ 25. Kd5 Qb5+ 26. Ke6 Qe8+ 27. Kf5 Qf7+ 28. Ke4 Qh7+ 29. Rg6 *

I used Crystal 3.2. Maybe Crystal 251221 is a bit buggy.

[Hobacle]

Sadly...

[fen]7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1[/fen]

However, by changing the place of the h rook, we can get many more positions. I'll try to work them out and find the best position...

Why not stick to this one and why "sadly"?

Anyhow, I think it's ok now.

After some Backward of lines after moves that were won or dubious before:

7k/p1pp2p1/1p1p3p/8/2P2B2/q1PP4/7R/5RK1 w - - 0 1

Analysis by Crystal 251221:
...
3. = (0.00): 1.Bc1 Qc5+ 2.Rhf2 a5 3.Re1 Kh7 4.Be3 Qe5 5.Bd2 Qh5 6.Rg2 Kg8 7.Be3 Qe5 8.Bd2

How do you get 0.00 for 1.Bc1 ?

I get +10 with the line :

[White "W"]
[Black "B"]
[Result "*"]
[SetUp "1"]
[FEN "7k/p1p3p1/1p1p3p/6B1/2P5/q1PP4/7R/5RK1 w - - 0 1"]

1. Bc1 Qc5+ 2. d4 Qxc4 3. Bxh6 gxh6 4. Rxh6+ Kg7 5. Rh3 Qe6 6. Rg3+ Kh7 7.
Rf4 Qe1+ 8. Kg2 Qd2+ 9. Rf2 Qe1 10. Rf4 Qd2+ 11. Rf2 Qe1 12. Rh3+ Kg7 13.
Rhf3 Kh8 14. Rh3+ Kg7 15. Rhf3 Kh7 16. Kh2 Qe4 17. Rh3+ Kg8 18. Rg3+ Kh8
19. Rfg2 Qf4 20. Kg1 Qc1+ 21. Kf2 Qd2+ 22. Kf3 Qd3+ 23. Kf4 Qf1+ 24. Ke4
Qb1+ 25. Kd5 Qb5+ 26. Ke6 Qe8+ 27. Kf5 Qf7+ 28. Ke4 Qh7+ 29. Rg6 *

I used Crystal 3.2. Maybe Crystal 251221 is a bit buggy.

1.Bc1 Qxc3 meets 2.Bb2 because the h rook is at h2, so 1.Bc1 can be winning in that position. I'm considering changing the place of the h rook.