Another chess problem cooked by engines

[Vinvin]

Here is another one from 2013, this is a white to play and win by Mikitovics however after white's 3rd move black's 3...Nf2! in the sub-variation holds on to the draw after 4.Ng3 Nh3+!


here is the pgn:

[pgn][Event "2.comm Aloni 75 JT (twin)"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Mikitovics, Janos"]
[Black "?"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2000"]
[TimeControl "300"]
[SetUp "1"]
[FEN "8/8/8/4Kp2/8/BB1p4/4p2n/4k2N w - - 0 1"]
[Termination "normal"]
[PlyCount "29"]
[WhiteType "program"]
[BlackType "human"]

1. Kf4 $1 (1. Bb4+ $2 Kf1 $1 (1. .. d2 $2 2. Kf4) 2. Ng3+ Kf2 $11 (2. ..
Kg2 $2 3. Kf4 $1 Nf3 4. Bd5 $18)) 1. .. d2 (1. .. Kf1 2. Ng3+ Kf2 (2. ..
Kg2 3. Bd5+ $18) 3. Bc5+ $18) 2. Bb4 Ng4 3. Bc2 (3. Kxf5 $2 3. .. Nf2 $1 4.
Ng3 Nd3 $11) (3. Kf3 $2 3. .. Ne5+ 4. Kg2 Ng6 5. Bc2 Nf4+ 6. Kf3 Ng6 7. Ba4
Ne5+ 8. Kg2) (3. Ng3 $2 Kf2 $11) 3. .. Nf6 $1 (3. .. Nf2 4. Ng3 Ne4 5. Bxe4
fxe4 6. Ke3 $18 (6. Nxe4 $2 Kd1 $11)) 4. Kf3 Ng4 $1 (4. .. Ne4 5. Kg2 Nc3
6. Bxc3 $18 (6. Nf2 $2 d1=N {$1 $11})) 5. Ba4 $1 (5. Bb3 $2 Ne5+ 6. Kg2 Ng6
7. Bc2 Nf4+ 8. Kf3 Ng6 9. Ba4 Ne5+ 10. Kg2) 5. .. Ne5+ 6. Kg2 Nd3 (6. ..
Ng6 7. Bb5 f4 8. Kf3) 7. Ba5 $1 (7. Bc3 $2 Nb2 $3 (7. .. Nf4+ $2 8. Kf3 Ng6
9. Ba5 Ne5+ 10. Kg2 $18) (7. .. Nc5 $2 8. Bc2 $18) 8. Bb5 Kd1 (8. .. Nd1 $2
9. Ba5 $18) 9. Nf2+ Kc2 {$1 $11}) 7. .. Nf4+ (7. .. f4 8. Bb3 Nc1 9. Bc2
$18) 8. Kf3 Ne6 $1 (8. .. Nd3 9. Ke3 Kf1 10. Ng3+ $18) (8. .. Ng6 9. Bb5
$18) 9. Bb4 $1 (9. Bb5 $2 9. .. Nd4+ $11) (9. Ke3 $2 9. .. f4+ $11) (9. Kg2
$2 Nf4+ 10. Kf3 Ne6 11. Bb4) 9. .. f4 $1 (9. .. Nc5 10. Bb5 Ne6 11. Ke3 f4+
12. Ke4 $1 f3 13. Ke3 $3 (13. Kxf3 $2 Nd4+ $11)) 10. Kg2 $1 Ng5 11. Nf2 $1
(11. Bc2 $2 f3+ $11 (11. .. Ne6 $2 12. Bd3 $18)) 11. .. f3+ 12. Kg3 $1 (12.
Kg1 $2 Nh3+ 13. Nxh3 f2+ 14. Nxf2 {Stalemate}) 12. .. Kf1 (12. .. Ne6 13.
Ne4 $18 (13. Bb5 $2 13. .. Nd4 14. Bd3 Nc6 15. Bc3 Nd4 $1 16. Ba6 Nf5+ 17.
Kxf3 Nh4+ 18. Kg3 Nf5+ 19. Kg2 Nh4+ 20. Kg1 Nf3+ 21. Kg2 Nh4+ $11) (13. Bc3
$2 Nd4 14. Ne4 f2 15. Bxd2+ Kf1 16. Bb5 Kg1 {$1 $11})) 13. Bb5 $1 Ne4+ 14.
Kxf3 $1 (14. Nxe4 $2 d1=Q) 14. .. d1=Q 15. Nxd1 $18 1-0[/pgn]


and here is the position after white's 4th move in the sub variation:

[fen]8/8/8/5p2/1B3K2/6N1/2Bppn2/4k3 b - - 5 4[/fen]

I see no draw after 3...Nf2 4.Ng3 Nh3+ :

FEN: 8/8/8/5p2/1B3K2/6Nn/2Bpp3/4k3 w - - 6 5

+152,58 5.Kxf5 Kf2 6.Ne4+ Kf1 7.Nxd2+ Kg2 8.Nb3 Kf1 9.Bd3 Kf2 10.Bc5+ Ke1 11.Nc1 Kd2 12.Bxe2 Kxc1

[acase]

Here is another one from 2013, this is a white to play and win by Mikitovics however after white's 3rd move black's 3...Nf2! in the sub-variation holds on to the draw after 4.Ng3 Nh3+!


here is the pgn:

[pgn][Event "2.comm Aloni 75 JT (twin)"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Mikitovics, Janos"]
[Black "?"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2000"]
[TimeControl "300"]
[SetUp "1"]
[FEN "8/8/8/4Kp2/8/BB1p4/4p2n/4k2N w - - 0 1"]
[Termination "normal"]
[PlyCount "29"]
[WhiteType "program"]
[BlackType "human"]

1. Kf4 $1 (1. Bb4+ $2 Kf1 $1 (1. .. d2 $2 2. Kf4) 2. Ng3+ Kf2 $11 (2. ..
Kg2 $2 3. Kf4 $1 Nf3 4. Bd5 $18)) 1. .. d2 (1. .. Kf1 2. Ng3+ Kf2 (2. ..
Kg2 3. Bd5+ $18) 3. Bc5+ $18) 2. Bb4 Ng4 3. Bc2 (3. Kxf5 $2 3. .. Nf2 $1 4.
Ng3 Nd3 $11) (3. Kf3 $2 3. .. Ne5+ 4. Kg2 Ng6 5. Bc2 Nf4+ 6. Kf3 Ng6 7. Ba4
Ne5+ 8. Kg2) (3. Ng3 $2 Kf2 $11) 3. .. Nf6 $1 (3. .. Nf2 4. Ng3 Ne4 5. Bxe4
fxe4 6. Ke3 $18 (6. Nxe4 $2 Kd1 $11)) 4. Kf3 Ng4 $1 (4. .. Ne4 5. Kg2 Nc3
6. Bxc3 $18 (6. Nf2 $2 d1=N {$1 $11})) 5. Ba4 $1 (5. Bb3 $2 Ne5+ 6. Kg2 Ng6
7. Bc2 Nf4+ 8. Kf3 Ng6 9. Ba4 Ne5+ 10. Kg2) 5. .. Ne5+ 6. Kg2 Nd3 (6. ..
Ng6 7. Bb5 f4 8. Kf3) 7. Ba5 $1 (7. Bc3 $2 Nb2 $3 (7. .. Nf4+ $2 8. Kf3 Ng6
9. Ba5 Ne5+ 10. Kg2 $18) (7. .. Nc5 $2 8. Bc2 $18) 8. Bb5 Kd1 (8. .. Nd1 $2
9. Ba5 $18) 9. Nf2+ Kc2 {$1 $11}) 7. .. Nf4+ (7. .. f4 8. Bb3 Nc1 9. Bc2
$18) 8. Kf3 Ne6 $1 (8. .. Nd3 9. Ke3 Kf1 10. Ng3+ $18) (8. .. Ng6 9. Bb5
$18) 9. Bb4 $1 (9. Bb5 $2 9. .. Nd4+ $11) (9. Ke3 $2 9. .. f4+ $11) (9. Kg2
$2 Nf4+ 10. Kf3 Ne6 11. Bb4) 9. .. f4 $1 (9. .. Nc5 10. Bb5 Ne6 11. Ke3 f4+
12. Ke4 $1 f3 13. Ke3 $3 (13. Kxf3 $2 Nd4+ $11)) 10. Kg2 $1 Ng5 11. Nf2 $1
(11. Bc2 $2 f3+ $11 (11. .. Ne6 $2 12. Bd3 $18)) 11. .. f3+ 12. Kg3 $1 (12.
Kg1 $2 Nh3+ 13. Nxh3 f2+ 14. Nxf2 {Stalemate}) 12. .. Kf1 (12. .. Ne6 13.
Ne4 $18 (13. Bb5 $2 13. .. Nd4 14. Bd3 Nc6 15. Bc3 Nd4 $1 16. Ba6 Nf5+ 17.
Kxf3 Nh4+ 18. Kg3 Nf5+ 19. Kg2 Nh4+ 20. Kg1 Nf3+ 21. Kg2 Nh4+ $11) (13. Bc3
$2 Nd4 14. Ne4 f2 15. Bxd2+ Kf1 16. Bb5 Kg1 {$1 $11})) 13. Bb5 $1 Ne4+ 14.
Kxf3 $1 (14. Nxe4 $2 d1=Q) 14. .. d1=Q 15. Nxd1 $18 1-0[/pgn]


and here is the position after white's 4th move in the sub variation:

[fen]8/8/8/5p2/1B3K2/6N1/2Bppn2/4k3 b - - 5 4[/fen]

I see no draw after 3...Nf2 4.Ng3 Nh3+ :

FEN: 8/8/8/5p2/1B3K2/6Nn/2Bpp3/4k3 w - - 6 5

+152,58 5.Kxf5 Kf2 6.Ne4+ Kf1 7.Nxd2+ Kg2 8.Nb3 Kf1 9.Bd3 Kf2 10.Bc5+ Ke1 11.Nc1 Kd2 12.Bxe2 Kxc1

Let me help you out here Vincent:

from your FEN:

8/8/8/5p2/1B3K2/6Nn/2Bpp3/4k3 w - - 6 5


0.00 5.Kf4xf5 Nh3-g1 6.Kf5-e4 Ke1-f2 7.Ng3xe2 Kf2xe2 8.Bc2-d3+ Ke2-f2 9.Bb4xd2 Ng1-f3 10.Bd2-e3+ Kf2-g3 11.Be3-c5 Nf3-e1 12.Bd3-a6 Ne1-g2 13.Ba6-c8 Ng2-h4 14.Bc8-a6 Nh4-g2

[acase]

Here is another one from 2013, this is a white to play and win by Mikitovics however after white's 3rd move black's 3...Nf2! in the sub-variation holds on to the draw after 4.Ng3 Nh3+!


here is the pgn:

[pgn][Event "2.comm Aloni 75 JT (twin)"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Mikitovics, Janos"]
[Black "?"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2000"]
[TimeControl "300"]
[SetUp "1"]
[FEN "8/8/8/4Kp2/8/BB1p4/4p2n/4k2N w - - 0 1"]
[Termination "normal"]
[PlyCount "29"]
[WhiteType "program"]
[BlackType "human"]

1. Kf4 $1 (1. Bb4+ $2 Kf1 $1 (1. .. d2 $2 2. Kf4) 2. Ng3+ Kf2 $11 (2. ..
Kg2 $2 3. Kf4 $1 Nf3 4. Bd5 $18)) 1. .. d2 (1. .. Kf1 2. Ng3+ Kf2 (2. ..
Kg2 3. Bd5+ $18) 3. Bc5+ $18) 2. Bb4 Ng4 3. Bc2 (3. Kxf5 $2 3. .. Nf2 $1 4.
Ng3 Nd3 $11) (3. Kf3 $2 3. .. Ne5+ 4. Kg2 Ng6 5. Bc2 Nf4+ 6. Kf3 Ng6 7. Ba4
Ne5+ 8. Kg2) (3. Ng3 $2 Kf2 $11) 3. .. Nf6 $1 (3. .. Nf2 4. Ng3 Ne4 5. Bxe4
fxe4 6. Ke3 $18 (6. Nxe4 $2 Kd1 $11)) 4. Kf3 Ng4 $1 (4. .. Ne4 5. Kg2 Nc3
6. Bxc3 $18 (6. Nf2 $2 d1=N {$1 $11})) 5. Ba4 $1 (5. Bb3 $2 Ne5+ 6. Kg2 Ng6
7. Bc2 Nf4+ 8. Kf3 Ng6 9. Ba4 Ne5+ 10. Kg2) 5. .. Ne5+ 6. Kg2 Nd3 (6. ..
Ng6 7. Bb5 f4 8. Kf3) 7. Ba5 $1 (7. Bc3 $2 Nb2 $3 (7. .. Nf4+ $2 8. Kf3 Ng6
9. Ba5 Ne5+ 10. Kg2 $18) (7. .. Nc5 $2 8. Bc2 $18) 8. Bb5 Kd1 (8. .. Nd1 $2
9. Ba5 $18) 9. Nf2+ Kc2 {$1 $11}) 7. .. Nf4+ (7. .. f4 8. Bb3 Nc1 9. Bc2
$18) 8. Kf3 Ne6 $1 (8. .. Nd3 9. Ke3 Kf1 10. Ng3+ $18) (8. .. Ng6 9. Bb5
$18) 9. Bb4 $1 (9. Bb5 $2 9. .. Nd4+ $11) (9. Ke3 $2 9. .. f4+ $11) (9. Kg2
$2 Nf4+ 10. Kf3 Ne6 11. Bb4) 9. .. f4 $1 (9. .. Nc5 10. Bb5 Ne6 11. Ke3 f4+
12. Ke4 $1 f3 13. Ke3 $3 (13. Kxf3 $2 Nd4+ $11)) 10. Kg2 $1 Ng5 11. Nf2 $1
(11. Bc2 $2 f3+ $11 (11. .. Ne6 $2 12. Bd3 $18)) 11. .. f3+ 12. Kg3 $1 (12.
Kg1 $2 Nh3+ 13. Nxh3 f2+ 14. Nxf2 {Stalemate}) 12. .. Kf1 (12. .. Ne6 13.
Ne4 $18 (13. Bb5 $2 13. .. Nd4 14. Bd3 Nc6 15. Bc3 Nd4 $1 16. Ba6 Nf5+ 17.
Kxf3 Nh4+ 18. Kg3 Nf5+ 19. Kg2 Nh4+ 20. Kg1 Nf3+ 21. Kg2 Nh4+ $11) (13. Bc3
$2 Nd4 14. Ne4 f2 15. Bxd2+ Kf1 16. Bb5 Kg1 {$1 $11})) 13. Bb5 $1 Ne4+ 14.
Kxf3 $1 (14. Nxe4 $2 d1=Q) 14. .. d1=Q 15. Nxd1 $18 1-0[/pgn]


and here is the position after white's 4th move in the sub variation:

[fen]8/8/8/5p2/1B3K2/6N1/2Bppn2/4k3 b - - 5 4[/fen]

I see no draw after 3...Nf2 4.Ng3 Nh3+ :

FEN: 8/8/8/5p2/1B3K2/6Nn/2Bpp3/4k3 w - - 6 5

+152,58 5.Kxf5 Kf2 6.Ne4+ Kf1 7.Nxd2+ Kg2 8.Nb3 Kf1 9.Bd3 Kf2 10.Bc5+ Ke1 11.Nc1 Kd2 12.Bxe2 Kxc1

Let me help you out here Vincent:

from your FEN:

8/8/8/5p2/1B3K2/6Nn/2Bpp3/4k3 w - - 6 5


0.00 5.Kf4xf5 Nh3-g1 6.Kf5-e4 Ke1-f2 7.Ng3xe2 Kf2xe2 8.Bc2-d3+ Ke2-f2 9.Bb4xd2 Ng1-f3 10.Bd2-e3+ Kf2-g3 11.Be3-c5 Nf3-e1 12.Bd3-a6 Ne1-g2 13.Ba6-c8 Ng2-h4 14.Bc8-a6 Nh4-g2

Oops, I think I posted a little too hastily on this one . After looking at it more closely the variation I gave leads to a tablebase win for white, thanks Vince for correcting me. As far as I know this one is NOT cooked.

[acase]

I think that this one is cooked, this is a black to move and draw by Gady Costeff from 2017 however after doing some FW-BW analysis Stockfish seems to think that black mates in no more than 43 moves starting with 1...Qxh1+.


[pgn][Event "2nd Prize H. Aloni MT-2017"]
[Site "Variantim"]
[Date "2017"]
[Round "?"]
[White "Gady Costeff"]
[Black "?"]
[Result "1/2-1/2"]
[TimeControl "300"]
[SetUp "1"]
[FEN "2b4q/3P4/2PP4/8/1k6/8/4N3/B3K2B b - - 0 1"]
[Termination "normal"]
[PlyCount "12"]
[WhiteType "program"]
[BlackType "human"]

1. ... Qxa1+ {2nd main line:} (1. .. Qxh1+ 2. Kd2 Qh6+ 3. Kc2 Qg6+ 4. Kc1
Bxd7 5. cxd7 Qxd6 6. Nd4 Qxd7 7. Kb1 {Karstadt fortress on the queenside})
2. Kf2 (2. Kd2 Qa2+ 3. Ke1 (3. Ke3 Bxd7 4. cxd7 Qe6+ 5. Kf2 Qxd7 6. Ng3
Qxd6 7. Ne4 Qh2+) 3. .. Ba6 4. Bf3 Qa1+ 5. Kf2 Bxe2 6. d8=Q Qf1+ 7. Ke3
Qxf3+ 8. Kd2 (8. Kd4 Qf4+ 9. Kd5 Bc4#) 8. .. Qf2 {$1 $19}) 2. .. Qa7+ 3.
Kg2 Bxd7 4. cxd7 Qb7+ 5. Kg1 Qxd7 6. Ng3 Qxd6 7. Ne4 {Karstadt fortress on
the kingside} 1/2-1/2[/pgn]


74/95 01:12 2,486,396k 34,334k +M43 1. ... Qh8xh1+ 2.Ke1-f2 Bc8xd7 3.c6xd7 Qh1-h2+ 4.Kf2-e3 Qh2xd6 5.Ne2-f4 Qd6xd7 6.Ba1-f6 Qd7-f5 7.Bf6-h4 Kb4-c5 8.Bh4-f2 Qf5-e5+ 9.Ke3-f3+ Kc5-d6 10.Bf2-g3 Qe5-c3+ 11.Kf3-g4 Qc3-g7+ 12.Kg4-f3 Qg7-b7+ 13.Kf3-g4 Qb7-e4 14.Kg4-g5 Qe4-f3 15.Nf4-h5+ Kd6-d5 16.Bg3-f4 Kd5-e6 17.Nh5-g3 Qf3-d3 18.Bf4-c7 Qd3-h7 19.Bc7-f4 Qh7-g8+ 20.Kg5-h4 Ke6-f6 21.Kh4-h3 Qg8-d5 22.Kh3-g4 Qd5-d1+ 23.Kg4-h4 Qd1-d7 24.Ng3-e2 Qd7-e8 25.Ne2-g3 Qe8-e6 26.Bf4-g5+ Kf6-g6 27.Bg5-d2 Qe6-e7+ 28.Kh4-g4 Qe7-d7+ 29.Kg4-f3 Qd7xd2 30.Ng3-e4 Qd2-d3+ 31.Kf3-f4 Qd3-d4 32.Kf4-f3 Kg6-f5 33.Ne4-g3+ Kf5-e5 34.Ng3-e2 Qd4-c5 35.Ne2-g3 Qc5-f8+ 36.Kf3-g4 Qf8-f4+ 37.Kg4-h3 Qf4-g5 38.Kh3-h2 Ke5-f4 39.Ng3-e2+ Kf4-e3 40.Ne2-g1 Qg5-g4 41.Ng1-h3 Ke3-e2 42.Nh3-f4+ Ke2-f1 43.Nf4-g6 Qg4-g2+


here is the starting position:

[fen]2b4q/3P4/2PP4/8/1k6/8/4N3/B3K2B b - - 0 1[/fen]

[acase]

Here is a white to move and draw by Kudelich from 2011, however from the starting position it looks like white loses.

here is the pgn:
[pgn][Event "Comm. Biuzandyan, Varov, Grigoryan MT"]
[Site "?"]
[Date "2011.07.09"]
[Round "?"]
[White "Kudelich=E"]
[Black "?"]
[Result "1/2-1/2"]
[BlackElo "2000"]
[WhiteElo "2000"]
[TimeControl "120"]
[SetUp "1"]
[FEN "4kr2/5b1p/5P2/pK6/4N3/p7/3B4/8 w - - 0 1"]
[Termination "normal"]
[PlyCount "25"]
[WhiteType "program"]
[BlackType "program"]

1. Kc6 $1 Rh8 $1 2. Nd6+ Kf8 3. Bh6+ Kg8 4. Kd7 $1 a2 5. Nc8 Bd5 6. Ke8
Bc6+ 7. Ke7 Bd5 8. Ke8 Bf7+ 9. Kd7 Bg6 10. Ke6 Bf5+ 11. Ke7 Bg6 12. Ke6
Bf7+ 13. Kd7 {positional draw} 1/2-1/2[/pgn]


and here is the starting position:
[fen]4kr2/5b1p/5P2/pK6/4N3/p7/3B4/8 w - - 0 1[/fen]

it seems that after 1.Kc6 that 1...kd8! wins.

[acase]

Here is a 2004 study by Oleg Pervakov that looks like it's cooked on the first move, this is a white to play and win, but the main line 1.d3 leads to a draw after black plays 1...Re1! and the sub variation 1.g7 leads to a fortress.

here is the pgn:
[pgn][Event "1.sp.p Averbach-80 JT EBUR"]
[Site "?"]
[Date "2004.??.??"]
[Round "?"]
[White "Pervakov=O"]
[Black "[+0340.66a3h5"]
[Result "1-0"]
[BlackElo "2000"]
[WhiteElo "2000"]
[TimeControl "120"]
[SetUp "1"]
[FEN "B7/4p3/p1Pp2Pp/3pP2k/4r3/Kp6/1PbP1P2/8 w - - 0 1"]
[Termination "normal"]
[PlyCount "19"]
[WhiteType "program"]
[BlackType "program"]

1. d3 $1 (1. g7 $2 Rg4 2. c7 Bf5 3. e6 Bxe6 4. Bxd5 Bxd5 5. c8=Q Rxg7 6.
Qh3+ Kg5 $1 7. f4+ (7. Qg3+ Kf6 $1 8. Qf4+ Ke6 9. Qxh6+ Kf7 10. Qh5+ Ke6)
7. .. Kf6 $1 8. Qxh6+ Rg6 9. Qh8+ Ke6 10. Qc8+ Kf6 $1 11. Qf8+ Bf7 12. Qh8+
Kf5 13. Qh7 Kf6 14. Qh4+ Ke6 15. f5+ Kxf5 16. Qxe7 Rf6 17. Qe2 Kg6 18. Qxa6
Kg7 19. Qb5 Rh6 20. Qd3 Rh5 21. Qd4+ Kg6 22. Qxd6+ Kg7 23. Qg3+ Kf6 24. Kb4
Rd5 25. Qh4+ Kg6 26. Qe4+ Kf6 27. Qh7 Ke7 28. Kc3 Ke8 29. Qh8+ Ke7 30. Qh4+
Ke8 31. Qf6 Rc5+ 32. Kb4 Rh5 33. Qd6 Rf5 34. Qb8+ Ke7 35. Qb7+ Kf6 36. Qc8
Kg6 37. Kc3 Rh5 38. Qa6+ Kg7 39. Qc6 Rf5 40. Qg2+ Kf6 41. Kd4 Rh5 42. Qb7
Kg7 43. Qe7 Kg6 44. Ke3 Rd5 45. Qc7 Rg5 46. Kd4 Rh5 47. Qg3+ Kh6 48. Qg4
Kh7 49. Ke4 Kh6 50. Kf4 Kh7 51. Qg3 Kh6 52. Qg1 Kh7 53. d3 Kh6 54. Ke4 Bd5+
55. Kd4 Bf7 56. Qg3) 1. .. Bxd3 (1. .. Kxg6 2. c7 Rc4 (2. .. Bxd3 3. c8=Q
Rxe5 4. Bxd5 $1) 3. dxc4 Bf5 4. exd6 exd6 5. Bb7 h5 6. cxd5 h4 7. Bxa6) 2.
g7 Rg4 3. c7 Bf5 4. e6 $1 Bxe6 (4. .. Rxg7 5. c8=Q d4 6. Bd5 Kg6 7. Qxa6 h5
8. Qa4) 5. Bxd5 $1 Bxd5 6. c8=Q Rxg7 (6. .. e5 7. Qf5+ Rg5 8. Qh3+ Kg6 9.
Qd3+ Kxg7 10. Qxd5 Rg6 11. Qb7+ Kf6 12. Qxa6 Kg5 13. Kxb3) 7. Qh3+ Kg5 8.
Qc3 Rf7 9. Qd2+ Kg6 10. Qxd5 1-0[/pgn]


and here is the starting position:
[fen]B7/4p3/p1Pp2Pp/3pP2k/4r3/Kp6/1PbP1P2/8 w - - 0 1[/fen]


Here is what Stockfish thinks of the sub variation 1.g7, I added the moves to the pgn.

82/103 21:12:45 2,964,154,787k 38,815k +2.46 11.Qc8-f8+ Bd5-f7 12.Qf8-h8+ Kf6-f5 13.Qh8-h7 Kf5-f6 14.Qh7-h4+ Kf6-e6 15.f4-f5+ Ke6xf5 16.Qh4xe7 Rg6-f6 17.Qe7-e2 Kf5-g6 18.Qe2xa6 Kg6-g7 19.Qa6-b5 Rf6-h6 20.Qb5-d3 Rh6-h5 21.Qd3-d4+ Kg7-g6 22.Qd4xd6+ Kg6-g7 23.Qd6-g3+ Kg7-f6 24.Ka3-b4 Rh5-d5 25.Qg3-h4+ Kf6-g6 26.Qh4-e4+ Kg6-f6 27.Qe4-h7 Kf6-e7 28.Kb4-c3 Ke7-e8 29.Qh7-h8+ Ke8-e7 30.Qh8-h4+ Ke7-e8 31.Qh4-f6 Rd5-c5+ 32.Kc3-b4 Rc5-h5 33.Qf6-d6 Rh5-f5 34.Qd6-b8+ Ke8-e7 35.Qb8-b7+ Ke7-f6 36.Qb7-c8 Kf6-g6 37.Kb4-c3 Rf5-h5 38.Qc8-a6+ Kg6-g7 39.Qa6-c6 Rh5-f5 40.Qc6-g2+ Kg7-f6 41.Kc3-d4 Rf5-h5 42.Qg2-b7 Kf6-g7 43.Qb7-e7 Kg7-g6 44.Kd4-e3 Rh5-d5 45.Qe7-c7 Rd5-g5 46.Ke3-d4 Rg5-h5 47.Qc7-g3+ Kg6-h6 48.Qg3-g4 Kh6-h7 49.Kd4-e4 Kh7-h6 50.Ke4-f4 Kh6-h7 51.Qg4-g3 Kh7-h6 52.Qg3-g1 Kh6-h7 53.d2-d3 Kh7-h6 54.Kf4-e4 Bf7-d5+ 55.Ke4-d4 Bd5-f7 56.Qg1-g3

[acase]

White to play and draw in this 2009 study by R. Becker, however it is a tablebase win for black.


Here is the pgn:

[pgn][Event "2nd HM, Babich 100 MT"]
[Site "?"]
[Date "2009.05.??"]
[Round "?"]
[White "R. Becker"]
[Black "?"]
[Result "1/2-1/2"]
[TimeControl "120"]
[SetUp "1"]
[FEN "8/8/p1R5/6p1/4k3/1p3b2/8/5K2 w - - 0 1"]
[Termination "normal"]
[PlyCount "18"]
[WhiteType "human"]
[BlackType "human"]

1. Ke1 $1 (1. Rb6 $2 Bd1 2. Ke1 Bc2 3. Kd2 g4 4. Rxa6 g3 5. Ra8 g2 6. Rg8
Kf3 7. Rf8+ Kg3 8. Rg8+ Kf2 9. Rf8+ Kg1 10. Kc3 Bd1 11. Rd8 Bg4 12. Rg8 Be6
13. Rg6 Bd5 14. Rf6 Kh2 15. Rh6+ Kg3 16. Rg6+ Kf2 17. Rf6+ Bf3 18. Rg6 Bd1
19. Rf6+ Kg3 20. Rg6+ Bg4 {-+}) 1. .. Ke3 2. Rb6 $1 Bd5 3. Rxa6 Bc4 4. Rb6
{$1 zz} g4 5. Rd6 {zz} Bd3 6. Rb6 Bc4 7. Rd6 g3 8. Rb6 {zz} g2 9. Rxb3+
Bxb3 {stalemate Stalemate} 1/2-1/2[/pgn]



and here is the starting position:

[fen]8/8/p1R5/6p1/4k3/1p3b2/8/5K2 w - - 0 1[/fen]

[acase]

Here is a white to play and win by Oleg Pervakov from 2017, however it is a draw. The sub variation on the first move 1.Qxc3 Rxc3 2.Kd2+ Kf2 3.Kxc3 Kxe2 4.Rb1 Bxf3 is a tablebase draw, not only that but the main line also draws if black plays 6...Kf2! instead of 6...Rd5+?.



[pgn][Event "3rd HM, Samir Badalov-55 MT"]
[Site "?"]
[Date "2017.??.??"]
[Round "?"]
[White "Oleg Pervakov (Russia)"]
[Black "?"]
[Result "1-0"]
[TimeControl "120"]
[SetUp "1"]
[FEN "b7/8/8/4p3/p7/P1r1rP2/4P3/R1QK1k2 w - - 0 1"]
[Termination "normal"]
[PlyCount "25"]
[WhiteType "human"]
[BlackType "human"]

1. Qd2 $1 (1. Qb2 $2 1. .. Bxf3 $1 2. exf3 Red3+ 3. Qd2 Rd4 $1 4. f4 $1 Rc5
$1 5. f5 Rxd2+ 6. Kxd2+ Kf2 7. Kd3 Kf3 $1 8. Rf1+ Kg2 $1 9. Re1 Kf2 $1 10.
Rb1 Kf3 11. Rf1+ Kg2 $11) (1. Qxc3 $2 1. .. Rxc3 2. Kd2+ Kf2 3. Kxc3 Kxe2
4. Rb1 Bxf3 5. Rb4 e4 $1 6. Kd4 Bg2 $11) (1. Qb1 $2 Rxe2 {$1 $19}) 1. ..
Bxf3 $1 (1. .. Kg2 2. Ra2 {$1 $18}) 2. exf3 Red3 (2. .. Rcd3 $2 3. Kc2+
$18) 3. Rb1 $1 (3. Qxd3+ $2 Rxd3+ 4. Kc2+ Ke2 $11) 3. .. Rd4 $1 (3. ..
Rxd2+ 4. Kxd2+ $18) 4. f4 $1 Rc5 $1 5. Rb4 $3 (5. f5 $2 5. .. Rxd2+ 6.
Kxd2+ Kf2 7. Kd3 Kf3 $1 8. Rf1+ Kg2 $1 9. Re1 Kf2 $1 10. Rb1 Kf3 11. Rf1+
Kg2 $11) (5. fxe5 $2 Rxd2+ 6. Kxd2+ Kf2 7. Rb4 Rd5+ $1 8. Kc3 Rxe5 9. Rxa4
Re3+ $1 10. Kb2 Re2+ $1 11. Kb3 Re3+ $11) 5. .. Rxd2+ 6. Kxd2 Rd5+ 7. Ke3
$1 (7. Kc3 $2 Ke2 $1 8. Re4+ Kf3 9. Rxe5 Rd8 10. f5 Kf4 11. Ra5 Kg5 12. Kc4
Re8 $11) 7. .. exf4+ 8. Rxf4+ Ke1 $1 9. Rxa4 Rh5 10. Re4 $1 (10. Kd3 $2
Rh3+ $1 11. Kc2 Rh2+ $1 12. Kb3 Rh3+ $11) 10. .. Rh3+ (10. .. Kd1 11. Kd3
Rh3+ 12. Re3 $18) 11. Kd4+ Kd2 12. a4 Kc2 13. Kc4 $1 (13. a5 $2 13. .. Ra3
14. Re2+ Kb1 $1 15. Re5 Ra4+ 16. Kc3 Ka2 $1 17. Re2+ Ka3 $1 18. Re1 Ka2 19.
Re2+ Ka3 $11) (13. Kc5 $2 Kb3 $1 14. a5 Rh5+ 15. Kb6 Rh6+ 16. Kb7 Rh7+ 17.
Kc6 Rh6+ 18. Kd7 Ra6 $11) 1-0[/pgn]


[fen]b7/8/8/4p3/p7/P1r1rP2/4P3/R1QK1k2 w - - 0 1[/fen]

[acase]

Here is one by Peter Krug and Mario Garcia from 2015, this is a white to play and win, however if black plays 2...Nc4+ instead of 2...Nf1 in the main line it looks like a draw.

[pgn][Event "ChessStar-2015"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Krug=Garcia, Peter=Mario"]
[Black "comm."]
[Result "1-0"]
[TimeControl "120"]
[SetUp "1"]
[FEN "8/4N2N/3b1P2/7k/4n2P/8/4K2P/8 w - - 0 1"]
[Termination "normal"]
[PlyCount "17"]
[WhiteType "human"]
[BlackType "human"]

1. Kf3 $1 (1. Ke3 $2 1. .. Nxf6 2. Nxf6+ Kxh4 3. Nf5+ Kh3 $11) (1. Nf5 $2
1. .. Kg6 2. Nxd6 Nxd6 3. Ng5 Kxf6 $11) (1. Nc8 $2 Bb4 2. f7 Kg6 $11) 1. ..
Nd2+ {main line} (1. .. Nxf6 2. Nxf6+ Kxh4 3. Ng6+ $1 (3. Nf5+ $2 Kh3 4.
Ng4 Bc7 $11) 3. .. Kh3 4. Ng4 Bxh2 {Insufficient material} 5. Nf2#
{Insufficient material}) 2. Ke3 $1 Nf1+ 3. Ke4 Nxh2 4. Nf5 Ng4 5. f7 $1 (5.
Nxd6 $2 Nxf6+ 6. Nxf6+ Kxh4 {$11 Insufficient material}) 5. .. Ba3 6. Kf4
$1 (6. f8=Q $2 Bxf8 7. Nxf8 Nh6 $1 8. Nxh6 Kxh4 {$11 Insufficient
material}) 6. .. Nf2 7. f8=Q $1 Bxf8 8. Nxf8 Nh3+ 9. Kg3 {$18 TRY} (9. Ke4
$2 Ng5+ 10. Kf4 Nf3 11. Kxf3 {stalemate Stalemate}) 1-0[/pgn]



[fen]8/4N2N/3b1P2/7k/4n2P/8/4K2P/8 w - - 0 1 [/fen]