Puzzle:
http://en.lichess.org/training/4248
After the first moves: ... Re8 Qf4
The puzzle only accepts as continuation: Qe7
There's however a second line: Re1+ , that registers as "failed". In an outside engine I use, this line is actually considered better. I checked at 30+ plies deep.
The puzzle should consider both lines. Right now it's rated as 2500, because it's broken.
http://en.lichess.org/training/4248
After the first moves: ... Re8 Qf4
The puzzle only accepts as continuation: Qe7
There's however a second line: Re1+ , that registers as "failed". In an outside engine I use, this line is actually considered better. I checked at 30+ plies deep.
The puzzle should consider both lines. Right now it's rated as 2500, because it's broken.