Most of the long mates available from different sources have happened in games from the early days of modern chess (19th Century). There was a time when the attack was the only important aspect of the game, each player doing everything to get to the opponent's King at any costs. There are several memorable games where one side (White the majority of time) performed a brilliant attack, including spectacular sacrifices to destroy the defence, and ended the game with the ultimate mate. This time you need to do it once again by breaking down Black's defence.
The original request reads "White to move and mate in 10"; would you agree with the number of moves required?
Total available points for this puzzle is 20. The answers will be published next week together with puzzle #180.
Puzzle #178 solution:
Game Daniel Harrwitz vs Allies, Brighton, 1848. Your answers were very interesting and I am sure the original players would have also appreciated them if they could. The points awarded show that all except one of you have managed to navigate to the end in one or more tries and with one or more hints provided. Too bad not everyone gave it a try!
1.Nf6+ Bxf6 2.Bf7+ Nxf7 3.Qxf7+ Kd8 4.Qf8+ Qe8 5.Rd1+ Nd5
[if 5... Bd7 6.Nf7+ Kc8 7.Qxe8+ Bxe8 8.Rd8#]
6.Nf7+ Kd7 7.Rxd5+ Ke6 8.Qxe8+ Be7 9.Ng5+ ...
or 9.Nd8+ Kf6 10.Qf7# (Leo) or 10.Bb2# (Alex, Ziyao)
or 9.Bb2 ... Black anything 10.Ng5# (Harmony)
9... Kf6 10.Qf7# (Philip, James, Jeffrey, Daniel)
James, Ziyao, Harmony, Philip - 20 points
Daniel - 19 points
Jeffrey - 18 points
Alex - 17 points
Leo - 16 points
Derrick - 6 points
Long mates (2)