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Up Topic The Rybka Lounge / Chess / Just ordinary easy for engine problems
- By MrKris (**) Date 2019-11-04 04:45
Games adapted from the article at:
https://chesscafe.com/the-skittles-room/composing-an-artistic-endgame/
explaining the difficulties in the simple looking position.

"White wins
P. Benko
1st Prize, Magyar Sakkelet, 1981"

Interestingly it won the prize back then where as we now know it as a 6-man ending, an instant ETB/Syzygy solution.

Even without ETB's engines find it very easy to solve.

[Event "1st Prize, Magyar Sakkelet"]
[Site "P. Benko ending study"]
[Date "1981"]
[Round "?"]
[White "wrong move"]
[Black ""]
[Result "1/2-1/2"]
[BlackElo "2400"]
[Time "17:01:47"]
[WhiteElo "2400"]
[TimeControl "720+3"]
[SetUp "1"]
[FEN "4K3/4P3/7k/8/2B4P/8/8/7r w - - 0 1"]
[Termination "normal"]
[PlyCount "14"]
[WhiteType "human"]
[BlackType "human"]

1. Kf7 {??} Re1 2. Be6 Rf1+ 3. Kg8 Rg1+ 4. Kh8 Rg7 5. e8=R (5. e8=Q Rh7+ 6.
Kg8 Rh8+ 7. Kxh8 {Stalemate}) 5. .. Rf7 {!} (5. .. Rb7 {??} 6. Bc4 {!} Rb4
7. Re6+ Kh5 8. Re4 Kh6 9. Kg8 {+- as the article says; humans/top ending
experts did know quite a lot before computers}) 6. Bg4 (6. Bxf7 {Stalemate}) (6. Ra8 {Stockfish 0.00} Rf4 7. h5 Kxh5) 6. .. Rh7+ 7. Kg8 Rg7+
{User Adjudication} 1/2-1/2

[Event "1st Prize, Magyar Sakkelet"]
[Site "P. Benko ending study"]
[Date "1981"]
[Round "?"]
[White "Solution"]
[Black "1st variation"]
[Result "1-0"]
[BlackElo "2400"]
[Time "17:01:47"]
[WhiteElo "2400"]
[TimeControl "720+3"]
[SetUp "1"]
[FEN "4K3/4P3/7k/8/2B4P/8/8/7r w - - 0 1"]
[Termination "adjudication"]
[PlyCount "17"]
[WhiteType "human"]
[BlackType "human"]

1. Be6 {!! +-} Rd1 2. h5 {!} (2. Kf7 {??} Rf1+ {= , see main variation
above}) 2. .. Kg7 3. h6+ Kh7 (3. .. Kxh6 4. Kf7 Rf1+ 5. Kg8 Rg1+ 6. Kh8 Rg7
7. e8=Q Rh7+ 8. Kg8 Rh8+ 9. Kxh8 {+- it is not stalemate without the white
pawn on h5 as above}) 4. Bf5+ Kg8 5. h7+ Kg7 6. h8=Q+ Kxh8 7. Kf7 Re1 8.
Be6 Rf1+ 9. Kg6 {zig-zag User Adjudication} 1-0

[Event "1st Prize, Magyar Sakkelet"]
[Site "P. Benko ending study"]
[Date "1981"]
[Round "?"]
[White "Solution"]
[Black "2nd variation"]
[Result "1-0"]
[BlackElo "2400"]
[Time "17:01:47"]
[WhiteElo "2400"]
[TimeControl "720+3"]
[SetUp "1"]
[FEN "4K3/4P3/7k/8/2B4P/8/8/7r w - - 0 1"]
[Termination "adjudication"]
[PlyCount "15"]
[WhiteType "human"]
[BlackType "human"]

1. Be6 {!! +-} Kg7 2. Kd7 Rd1+ 3. Kc6 Rc1+ 4. Kd5 Rd1+ 5. Ke5 {!} (5. Kc4
Rc1+ 6. Kd4 Rd1+ 7. Ke5) 5. .. Re1+ 6. Kf5 Rf1+ 7. Kg5 Rg1+ (7. .. Rf8 8.
exf8=Q+ Kxf8 9. Kf6 {+- , the black king is cut off from the 'wrong bishop'
corner}) 8. Kh5 {wins User Adjudication} 1-0
FEN: 4K3/4P3/7k/8/2B4P/8/8/7r w - - 0 1
Stockfish_19110221c0 no ETBs:
...
 15/34  00:00   728k  11,203k  +6.72  1.Be6 Rd1 2.h5 Kh7 3.h6 Rd4 4.Bf5+ Kxh6 5.Kf7 Kg5 6.e8Q Kxf5 7.Qc6 Kf4 8.Kg6
...
 38/55+  00:03   48,097k  13,683k  +64.02  1.Be6
 38/67+  00:06   89,005k  14,695k  +M123  1.Be6
...
 43/48  00:09   148,134k  15,427k  +M24  1.Be6 Rd1 2.h5 Kg7 3.h6+ Kh7 4.Bf5+ Kxh6 5.Kf7 Rf1 6.Kf6 Re1 7.Be6 Rf1+ 8.Ke5 Re1+ 9.Kf5 Rf1+ 10.Kg4 Rg1+ 11.Kf3 Rf1+ 12.Kg3 Rg1+ 13.Kf2 Rg7 14.e8Q Ra7 15.Qg8 Ra5 16.Kf3 Rg5 17.Qf8+ Kh7 18.Bf5+ Rxf5+ 19.Qxf5+ Kh8 20.Qd7 Kg8 21.Kf4 Kh8 22.Kf5 Kg8 23.Kf6 Kf8 24.Qf7+
...
 69/48  00:19   325,228k  16,841k  +M24  1.Be6 Rd1 2.h5 Kg7 3.h6+ Kh7 4.Bf5+ Kxh6 5.Kf7 Rf1 6.Kf6 Re1 7.Be6 Rf1+ 8.Ke5 Re1+ 9.Kf5 Rf1+ 10.Kg4 Rg1+ 11.Kf3 Rf1+ 12.Kg3 Rg1+ 13.Kf2 Rg6 14.e8Q Rf6+ 15.Kg3 Rf1 16.Kg4 Rg1+ 17.Kf5 Rf1+ 18.Ke5 Re1+ 19.Kf6 Rf1+ 20.Bf5 Rxf5+ 21.Kxf5 Kg7 22.Qe7+ Kg8 23.Kf6 Kh8 24.Qg7+


FEN: 4K3/4P3/7k/8/2B4P/8/8/7r w - - 0 1
Lc0-0.22_49921 no ETBs:
...
 10/21  00:01   10k  10k  +1.80  1.Be6 Ra1 2.Kd8 Rd1+ 3.Kc7 Rc1+ 4.Kd6 Rd1+ 5.Kc5 Rc1+ 6.Kd4 Rd1+ 7.Kc3 Re1 8.e8Q Re3+ 9.Kc4 Re4+
...
 14/36  01:05   2,182k  33k  +2.85  1.Be6 Rd1 2.h5 Kh7 3.h6 Rd2 4.Bf5+ Kxh6 5.Kf7 Re2 6.Be6 Rf2+ 7.Kg8 Rg2+ 8.Kh8 Rg7 9.e8Q Rh7+ 10.Kg8 Rg7+ 11.Kf8 Rg8+ 12.Bxg8 Kg5 13.Bh7 Kf6 14.Qa8
- By MrKris (**) Date 2019-11-04 04:57
From an article at
https://chesscafe.com/features/endgame-studies/
"W. Shinkman
The Dubuque Chess Journal, 1870
White to move and draw"

Stockfish finds an alternative 2nd move not given with the solution.

[Event "White to move and draw"]
[Site "W. Shinkman"]
[Date "1870"]
[Round "?"]
[White "Stockfish_19110221c0"]
[Black "Lc0-0.22_49921"]
[Result "1/2-1/2"]
[BlackElo "2200"]
[Time "19:29:32"]
[WhiteElo "2000"]
[TimeControl "720+3"]
[SetUp "1"]
[FEN "Bq6/2p5/p4p2/1p2P1rb/k2NQ3/r3b3/4Np2/1Kn5 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "26"]
[WhiteType "program"]
[BlackType "program"]

1. Nb3+ {Stockfish finds instantly with 0.00; Lc0-0.22_49921 finds it at
once but stays with a small negative evaluation} b4 (1. .. Bd4 2. Qxd4+ b4 3.
Nc3+ Kxb3 4. Bd5#) (1. .. Kxb3 2. Bd5#) 2. Nc3+ (2. Bc6+ {---- Stockfish finds
an alternate solution.} Qb5 (2. .. Kxb3 3. Qc2#) 3. Bxb5+ axb5 (3. .. Kxb3
4. Qc2#) (3. .. Kxb5 4. Qb7+ Kc4 (4. .. Bb6 5. Qd5+ Bc5 6. Qxc5+ Ka4 7.
Qc6+ Kxb3 8. Nxc1#) 5. Qc6+ Bc5 6. Qxc5+ Kd3 7. Nexc1+ Ke4 8. Qxf2 Kxe5 9.
Qe1+ Kf5 10. Qxb4 Rxb3+ 11. Qxb3 {+-}) 4. Qa8+ Kxb3 5. Qd5+ Ka4 6. Qa8+
{=}) 2. .. Kxb3 3. Bd5+ Kxc3 4. Qc2+ Kd4 5. Qc4+ Kxe5 6. Qe4+ Kd6 7. Qe6+
Kc5 8. Qc6+ Kd4 9. Qc4+ {forcing the draw:} Ke5 10. Qe4+ Kd6 11. Qe6+ Kc5
12. Qc6+ Kd4 13. Qc4+ Ke5 {3-fold repetition} 1/2-1/2
FEN: Bq6/2p5/p4p2/1p2P1rb/k2NQ3/r3b3/4Np2/1Kn5 w - - 0 1
Stockfish_19110221c0 PV=6: ... ---------------------------------------------------------------------------
 14/22  00:00   9,658k  13,087k  -32.48  1.Nf5+ Ka5 2.Qxe3 Rxe3 3.Nxe3 Nxe2 4.Be4 Rxe5 5.Kb2 Rxe4 6.Nf1 Qg8 7.Nd2 Kb6 8.Nxe4
 14/28  00:00   9,658k  13,087k  -29.80  1.Ng3 Bg6 2.Ndf5+ Ka5 3.Nf1 Bxf5 4.Qxf5 Rxf5 5.Bd5 Ne2 6.Bf7 Bd4 7.Kc2 Rc3+ 8.Kb2 fxe5
 14/17  00:00   9,658k  13,087k  -25.76  1.Nc3+ Rxc3 2.Nc2+ Ka5 3.Qb4+ Kb6 4.Qxc3 f1Q 5.Qxe3+ c5 6.Ne1 Ne2
 14/32  00:00   9,658k  13,087k  -21.30  1.Nc2+ Ka5 2.Qb4+ Kb6 3.Qxa3 Bd2 4.Ng3 Rxg3 5.Qxg3 f1Q 6.Bg2 Ne2+ 7.Bxf1 Nxg3 8.Bg2
 14/35  00:00   9,658k  13,087k  -17.48  1.Qc2+ Rb3+ 2.Nxb3 Nxe2 3.Qa2+ Kb4 4.Kb2 Qb6 5.Qa3+ Kc4 6.Na5+ Qxa5 7.Qxa5 f1Q 8.Qa2+ Kc5 9.Qa3+ Kd4 10.Qxa6 Rxe5
 14/20  00:00   9,658k  13,087k   0.00  1.Nb3+ b4 2.Bc6+ Qb5 3.Bxb5+ axb5 4.Qa8+ Kxb3 5.Qd5+ Ka4 6.Qa8+ Ba7 7.Nxc1 Rb3+ 8.Ka2 Ra3+
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Up Topic The Rybka Lounge / Chess / Just ordinary easy for engine problems

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