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MatPlus.Net Forum General Correcting an endgame
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(1) Posted by Per Olin [Thursday, Nov 28, 2019 11:59]

Correcting an endgame

In a recent issue of Tehtäväniekka, Proceedings of Finnish Chess Problem Society, Pauli Perkonoja corrected an old study of his. Mr Perkonoja is a versatile composer and a very successful solver in the early days of solving world championships. His correction of an old own endgame published sixty years ago must be a record for the time span when a correction is by the composer himself. I had aimed at the record myself, but I will have to accept a second or a lower placing.

My first problem, an endgame study, was published half a century ago. It was the time of no computer checking possibilities, further I had to stand on my toes to reach the pieces on the chess board. The correction has been tested by an old version of Fritz, but as we know, interpreting the testing results can be hazardous.

Per Olin
Tidskrift för Schack November 1969 correction

(= 4+7 )

Draw 4 + 7

Solution: 1.Se8 d3 (1. - Rg6 2.Rh8+ Kg4 3.Bxb4) 2.Bxd6 Bxd6+ (2. - Bc3 3.Bb4 d2 4.Sf6+ Bxf6 5.Bxd2; this might be critical) 3.Sxd6 d2 (3. - Bd5 4.Rh8+ Kg4 5.Rh3) 4.Se4 (4.Se8? Bf3 5.Sf6+ Kh6 6.Rd8 d1Q 7.Rxd1 Bxd1) 4. - d1Q (4...Bxe4 5.Rd8 Kg4 6.Rxd2 ) 5.Sf6+ Kh6 6.Sg4+ Kh7 7.Sf6+ Kh6 8.Sg4+ Qxg4 9.Rg6+ Kh7 10.Rg7+ Kh8 11.Rg8+ Kh7 12.Rg7+ Kh6 13.Rg6+ Kh5 14.Rh6+ Kxh6 stalemate.

Compared to the original publication a black pawn b6 has been added; adding the pawn on a7 has been considered as an alternative. The question is: will this correct the study? Verifications of soundness, cooks, suggestions, improvements, everything will be appreciated, thank you!
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(2) Posted by Alain Villeneuve [Friday, Nov 29, 2019 09:42]

BPa7 seems a better idea, because in the version with BPb6, 4 Ne8 cooks : 8 Nd5 b5 9 Nc3 Ba4 10 Kg3 = : if the black king goes far from Pg5, white plays Nxb5.
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(3) Posted by Geir Sune Tallaksen Østmoe [Saturday, Nov 30, 2019 08:12]

I agree with Alain. And I would not be worried about the 2...Bc3 3.Bb4 d2 4.Nf6+ Bxf6 5.Bxd2; while it's hard to prove with 100 % certainty, I don't see how Black is suppoed to make progress. Nor does Stockfish.
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(4) Posted by Per Olin [Saturday, Nov 30, 2019 10:31]

Thank you for the comments! The first comment: the solution starts with 1.Se8 d3 2.Bxd6 Bxd6+ 3.Sxd6 d2 4.Se4; now as a try is mentioned (4.Se8? Bf3 5.Sf6+ Kh6 6.Rd8 d1Q 7.Rxd1 Bxd1); the position that has aroused Kh2 Sf6 - Bd1 pawns b6 g5 is a win for Black as confirmed by tablebases. This means that 4.Se8? does not draw and is not a cook. Am I missing something here? Second comment: Thanks for analyzing with a strong program! If both additions (b6 and a7) correct the study, then a7 is to be preferred as it gives a more airy position.
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(5) Posted by Geir Sune Tallaksen Østmoe [Saturday, Nov 30, 2019 10:55]

Are you sure you entered the correct position into the tablebase? Kh2 Nf6 - Kh6 Bd1 Pb6 Pg5 with WTM is a draw because of the concrete idea 1.Nd5 b5 2.Nc3 Ba4.
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(6) Posted by Per Olin [Saturday, Nov 30, 2019 12:03]

Sorry, my confusion, Alain is right; I probably had the wrong party to move. This means that my question about missing something was justified. But with the pawn added on a7 this flaw is corrected. Thanks for all comments, your help has been appreciated!
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MatPlus.Net Forum General Correcting an endgame