Could anyone provide insight into the final moves of puzzle 3235? In the following position:
http://en.lichess.org/analysis/r4Nk1/1pp1q1p1/1b2pp1p/1P1pP3/3P4/n1P5/2Q2PPP/R4RK1_w_-_-#0
I played Ng6 (and failed the puzzle), after which the best response for Black is to move the queen. The computer gives +2 after Ng6. The best move is instead Qh7+, which makes sense. However, on Black's next move, the puzzle plays Kxf8, giving up the exchange. This is the top move according to the computer, but it isn't immediately clear why Kf7, avoiding losing the exchange, isn't also playable. The top engine line after this move involves both players retreating pieces in a line that is far from clear or forced. The evaluation difference between Kxf8 and Kf7 is +3 vs. +4.5, respectively. I anticipated Kf7, and it isn't immediately clear to me why this sequence is part of a tactics puzzle. The line after Ng6 Kf7 is very unclear and doesn't produce the sort of forced loss of material or mating threat one usually finds in tactics training.
Thanks in advance for any help!
http://en.lichess.org/analysis/r4Nk1/1pp1q1p1/1b2pp1p/1P1pP3/3P4/n1P5/2Q2PPP/R4RK1_w_-_-#0
I played Ng6 (and failed the puzzle), after which the best response for Black is to move the queen. The computer gives +2 after Ng6. The best move is instead Qh7+, which makes sense. However, on Black's next move, the puzzle plays Kxf8, giving up the exchange. This is the top move according to the computer, but it isn't immediately clear why Kf7, avoiding losing the exchange, isn't also playable. The top engine line after this move involves both players retreating pieces in a line that is far from clear or forced. The evaluation difference between Kxf8 and Kf7 is +3 vs. +4.5, respectively. I anticipated Kf7, and it isn't immediately clear to me why this sequence is part of a tactics puzzle. The line after Ng6 Kf7 is very unclear and doesn't produce the sort of forced loss of material or mating threat one usually finds in tactics training.
Thanks in advance for any help!