Infact Puzzle solving can drive you insane.
This book is excellent.
Do not be fooled by the cover, this book is tough.
Going through it and I hit here (puzzle No. 145) Zaitsev - Kotov 1961.
Can White play 1.Bxe6.
Yes...then No..Yes...No. Finally settle for a No. A neat, it looks good, but there is a snag puzzle.
1.Bxe6 Bxg3! nice. Looked at solution and I see 1...Bxg3 has a '?'
Without going any further I go back to the position.
Getting frustrated I cannot see what I am missing so eventually set up the position.
The given solution has missed a defensive shot.