I found this one in Timman’s «100 Endgame studies you must know» (no.62) as an example of mutual knight promotion, i.e. he gave 5.. e1=N as main line and continues with 6.Nc6 Ng2(sic) 7.Ne7 Ne3 8.Ng8#. This line has a second solution 7.Ne5 Ne3 8.Bf7 Nd5 9.Bxd5 etc.
Timman included even 2 cooked studies in his book. For many chess study books there are search tags on this site. To find the incorrect studies in Timman’s book, it is enough to add the “incorrect” tag to the book’s tag: 100-must incorrect.
The book by Nunn «Endgame Challenge» contains 18 incorrect studies.
The book by Vladimirov «1000 шахматных этюдов» contains 213 incorrect studies.
The book by Nielsen «Endgame Labyrinths» contains only 9 incorrect studies out of 1002.
I found this one in Timman’s «100 Endgame studies you must know» (no.62) as an example of mutual knight promotion, i.e. he gave 5.. e1=N as main line and continues with 6.Nc6 Ng2(sic) 7.Ne7 Ne3 8.Ng8#. This line has a second solution 7.Ne5 Ne3 8.Bf7 Nd5 9.Bxd5 etc.
Timman included even 2 cooked studies in his book. For many chess study books there are search tags on this site. To find the incorrect studies in Timman’s book, it is enough to add the “incorrect” tag to the book’s tag: 100-must incorrect.
The book by Nunn «Endgame Challenge» contains 18 incorrect studies.
The book by Vladimirov «1000 шахматных этюдов» contains 213 incorrect studies.
The book by Nielsen «Endgame Labyrinths» contains only 9 incorrect studies out of 1002.